QuickSpecs
HP t638 Thin Client
Overview
c06527271 — 16636— Asia-Pacific — Version 2 — January 14, 2021
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HP t638 Thin Client
FRONT
BACK
1.
Power button
1.
(4) USB-A 2.0 Type A port
2.
Power On indicator
2.
(2) Serial port with configurable power
3.
(1) USB-A 3.1 Gen 1 Type A port
3.
(1)19.5 V DC power input
4.
(1) USB-A 2.0 Type A port
4.
(1) Cable lock slot
5.
3.5 mm combo headset/audio jack
5.
(1) PS2 Combo Keyboard/Mouse
6.
System stand
6.
(1) Mini-DP Dual Serial Port
7.
Access panel to information labels and VESA 100
mounting holes
7.
(1) VGA analog video output
8.
(1) HDMI digital video output
9.
(1) Parallel port
10.
(1) RJ45 GbE network connector
11.
(1) System stand
QuickSpecs
HP t638 Thin Client
Overview
c06527271 — 16636— Asia-Pacific — Version 2 — January 14, 2021
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AT A GLANCE
• Intel® Celeron® Processor J4125; 2.0 – 2.7 GHz; 4 cores
2
• DDR4 dual-channel SDRAM system memory; up to 2400 MT/s transfer rate; two SODIMM slots
• Embedded Multi Media Card 16 / 32/ 64 GB
• 1 x HDMI 1.4b supporting up to 3840 x 2160 @ 30 Hz resolutions, 1x VGA video outputs supporting up to 1920 x 1200 @
60 Hz resolutions
• Solid-state flash memory storage; M.2 form factor modules
• Gigabit Ethernet (GbE) network connection
• Fast Ethernet (100 Mb/s) or Gigabit (1,000 Mb/s)
• Optional Intel® Wi-Fi® AX200 Wi-Fi 6/Bluetooth® 5 adapter
4
including antennas integrated internally in the chassis
• Option Port with a selection of available factory options (see detailed listing later in this document)
• Integrated PC speaker for basic audio playback; 3.5 mm combo headset/audio port on front
• 45W non-PFC external power adapter
• TCG certified TPM version 2.0 (firmware)
3
; other security features include a system UEFI designed to address NIST SP
800-147 guidelines, cable lock slot
• Passive thermal design (no cooling fans) and active thermal management technology that monitors the system operating
temperatures, throttles SOC operation if appropriate and prevents unit thermal shutdown.
• Rated for a maximum ambient operating temperature of 40 degree C
• ENERGY STAR® certified and EPEAT® 2019 Silver registered in the United States (except for some models configured with
Fiber Optic NIC networking options)5.
• Post-consumer recycled plastics content greater than 25% total unit plastics (by weight)
• Low halogen
1
material content
• All models TAA compliant in North America
1
This product is low halogen except for power cords, cables and peripherals, service parts obtained aftermarket may not be low halogen
2
Multicore is designed to improve performance of certain software products. Not all customers or software applications will necessarily
benefit from use of this technology. Performance and clock frequency will vary depending on application workload and your hardware and
software configurations. Intel’s numbering, branding and/or naming is not a measurement of higher performance.
3
In some cases, machines pre-configured with Windows OS might ship with TPM turned off
4
Wireless features, performance and support may vary depending on environmental variables such placement, settings and firmware of your
access points. Please contact your wireless vendor for support of your wireless environment
5
Based on US EPEAT® registration according to IEEE 1680.1-2018 EPEAT®. Status varies by country. Visit http://www.epeat.net for more
information.
Warranty
HP Customer Support: limited three-year hardware limited warranty in most regions; HP Care Packs are extended service
contracts that go beyond your standard limited warranties; for more details visit http://www.hp.com/go/cpc
QuickSpecs
HP t638 Thin Client
Technical Specifications
c06527271 — 16636— Asia-Pacific — Version 2 — January 14, 2021
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OPERATING SYSTEMS
• HP ThinPro, including HP Smart Zero Core
• Windows 10 IoT Enterprise LTSC 2019
PROCESSOR
Model
CPU Frequency
Max/Base
Cores
GPU Type
GPU Frequency
Intel® Celeron® Processor
J4125
2.7/2.0 GHz
4
Intel UHD Graphic 600
250 MHz
GRAPHICS
Number of displays supported:
2
Video outputs:
Standard:
(1) VGA analog output
(1) HDMI digital output
Max. screen resolution:
3840 x 2160 @ 30 Hz (With HDMI Output)
NOTE:
HP recommends dual channel memory (two SODIMMs) configurations for optimal display resolution performance
MEMORY
Type:
DDR4 dual channel SDRAM
Data Transfer Rate:
Up to 2,400 MT/s
Peak Transfer Rate:
Up to 19,200 MB/s
Number of Slots
2 x SODIMM
Capacities:
4, 8 GB
NOTES:
• The system’s Graphics Processing Unit (GPU) uses part of the total system memory. System memory dedicated to graphics
performance is not available for use by other programs
• HP recommends dual channel memory (two SODIMMs) configurations for optimal system performance
QuickSpecs
HP t638 Thin Client
Technical Specifications
c06527271 — 16636— Asia-Pacific — Version 2 — January 14, 2021
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UEFI
UEFI Specification Revision
2.3.1
TPM 2.0 (firmware)
Meets requirements for Common Criteria, an independent third-party certification of
trustworthiness
Meets requirements for FIPS 140-2, a standard for cryptographic integrity
Security features
System UEFI designed to address NIST SP 800-147 guidelines
STORAGE
Type:
NAND flash memory; non-volatile
Number of Sockets:
1 x M.2
Capacities:
16 GB M.2 eMMC flash module
32 GB M.2 eMMC flash module
64 GB M.2 eMMC flash module
128 GB M.2 SATA flash module
Input/Output
USB:
Front access:
(1) USB-A 3.1 Gen 1 port
(1) USB-A 2.0 port Type A port
Rear access:
(4) USB-A 2.0 Type A port
Video Outputs:
Standard:
(1) VGA analog output
(1) HDMI digital output
I/O Interfaces:
Standard:
(1) RJ45 network connector
(1) 3.5 mm combo headset/audio jack (front)
(2) serial port with configurable power
(2) serial ports enabled with an included cable adapter
(1) parallel port
Option Port:
The rear I/O panel includes an Option Port that can be configured with one of the following factory
options:
• 1 Mini-DP Dual serial port enabled with an included cable adapter
• Combo PS/2 port with an included cable adapter
AUDIO/VIDEO
Audio Subsystem
• Internal amplified speaker system for basic audio playback
• 3.5 mm combo headset/headphone/analog MIC in (front access)
Audio CODECs
• MP3
• AAC Stereo
• HE AAC
QuickSpecs
HP t638 Thin Client
Technical Specifications
c06527271 — 16636— Asia-Pacific — Version 2 — January 14, 2021
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• Includes hardware acceleration support
Video CODECs
• MPEG-4 part 2 (DivX, Xvid)
• MPEG-4 part 10 (H.264, AVC), Advanced Video Coding (AVC) (H.264 encode)
• MPEG-H part 2, High Efficiency Video Coding (HEVC) (H.265 decode)
• WMV 7/8/9 VC-1 & ASF Demuxer
• Includes hardware acceleration support
NETWORKING
Local Area Networking
Realtek RTL8111EPH-CG Gigabit Ethernet (GbE) Controller
Wi-Fi Networking
Intel® AX 200 Wi-Fi 6/Bluetooth® 5
NOTES:
Wireless access point and internet access required. Availability of public wireless access points limited
Wireless features, performance and support may vary depending on environmental variables such placement, settings and
firmware of your access points. Please contact your wireless vendor for support of your wireless environment
SOFTWARE SUPPORT
Host Environment
Protocol
HP
Microsoft
ThinPro
Windows 10 IoT Enterprise 2019
Remote Desktop Services
Remote FX (RFX), RDP
✔
✔
Citrix®
ICA, HDX
✔
✔
VMware® Horizon
RDP, PCoIP, Blast Extreme
✔
✔
Protocol Clients
HP
Microsoft
ThinPro
Windows 10 IoT Enterprise 2019
Citrix® Workspace app
✔
✔
Microsoft Remote Desktop Client
✔
Free Remote Desktop Client
✔
VMware™ Horizon View™ Client
✔
✔
HP Remote Graphics Software (RGS)
via add-on
Turbosoft TTerm for Linux®
Terminal emulation Software
via add-on
Turbosoft TTWin
Terminal emulation software
via add-on
QuickSpecs
HP t638 Thin Client
Technical Specifications
c06527271 — 16636— Asia-Pacific — Version 2 — January 14, 2021
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Browser Support
HP
Microsoft
ThinPro
Windows 10 IoT Enterprise 2019
Mozilla Firefox
✔
Internet Explorer
✔
Security
HP
Microsoft
ThinPro
Windows 10 IoT Enterprise 2019
Smart Card
✔
✔
Log-on Manager
✔
✔
Read only Operating System
✔
✔
802.1x
✔
✔
Microsoft Firewall
✔
HP Write Manager
✔
Microsoft Unified Write Filter
✔
NOTE: the HP Write Manager is the default active write filter. The Microsoft Unified Write Filter is disabled by default but can be enabled by the
user if required.
Management Tools
HP
Microsoft
ThinPro
Windows 10 IoT Enterprise 2019
HP Device Manager
✔
✔
HP ThinUpdate
✔
HP Easy Tools
✔
HP Smart Zero Client Services
✔
Microsoft SCCM/EDM agent
✔
HP USB Port Manager
✔
Additional Windows Components
HP
Microsoft
ThinPro
Windows 10 IoT Enterprise 2019
HP Easy Shell
✔
Windows Media Player
✔
Microsoft Direct Access
✔
Microsoft BranchCache
✔
QuickSpecs
HP t638 Thin Client
Technical Specifications
c06527271 — 16636— Asia-Pacific — Version 2 — January 14, 2021
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Microsoft AppLocker
✔
Microsoft Sideloading
✔
CyberLink
✔
NOTE: Other add-on software available (see: http://www.hp.com/support for latest list of available add-ons). Software performance and
support may vary depending on customer environment and backend.
Audio/Video CODECs
HP
Microsoft
ThinPro
Windows 10 IoT Enterprise 2019
MP3
✔
✔
WMA stereo
✔
✔
AAC stereo & HE AAC ✔
Microsoft AC3 encoder
✔
MPEG-1
✔
MPEG-4 part 2 (DivX, Xvid, H.263)
✔
✔
MPEG-4 part 10 (H.264, AVC)
✔
✔
WMV 7/8/9/ VC-1 & ASF Demuxer
✔
✔
Recommended TC config for Microsoft Teams media optimization
TC CPU
VMware Teams Optimization
Citrix Teams Optimization
t430
1.10 GHz 2 Core
-
-
t530
1.50 GHz 2 Core
-
-
t540
1.50 GHz 2 Core
-
-
t630
2.00 GHz 4 Core
✓
✓
t628
1.99 GHz 4 Core
-
✓
t638
2.00 GHz 4 Core
✓
✓
t640
2.40 GHz 2 Core
✓
✓
t730
2.70 GHz 4 Core
✓
✓
t740
3.25 GHz 4 Core
✓
✓
mt21
1.80 GHz 2 Core
-
✓
mt22
1.90 GHz 2 Core
-
✓
mt31
1.80 GHz 2 Core
-
✓
mt32
2.70 GHz 4 Core
✓
✓
mt45
2.10 GHz 4 Core
✓
✓
QuickSpecs
HP t638 Thin Client
Technical Specifications
c06527271 — 16636— Asia-Pacific — Version 2 — January 14, 2021
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mt46
2.50 GHz 4 Core
✓
✓
- Not recommended, ✓ recommended
WEIGHTS & DIMENSIONS
W x D x H:
(vertical orientation,
without stand)
50 x 210 x 210 mm
Volume:
2.2 liter
W x D x H:
(vertical orientation,
with stand)
152 x 210 x 210 mm
Volume
6.7 liter
System Weight
(unit with stand)
1231 g
Shipping Weight
3238.5 g
NOTE: All measurements are approximate; the addition of optional modules will increase the weight
EXTERNAL POWER SUPPLY
45W non-PFC Smart external power adapter
Worldwide auto-sensing 100 - 240 VAC; nominal voltage is 120 VAC; 50 - 60 Hz
Entergy saving automatic power-down; surge tolerant
1.8m output cable
External power adapters are sourced from several suppliers in order to ensure adequate supply and availability is maintained. The
actual dimensions of the power brick will vary by supplier.
HP P/N
Vendor
Dimensions:
L25296-001
Lite-On
94 x 40 x 26.5 mm
L25296-002
Chicony
95 x 40 x 26.5 mm
L25296-003
Delta
94 x 39 x 26.5 mm
L25296-004
AcBel
91.4 x 44 x 26.8 mm
COMPLIANCE/CERTIFICATIONS
Accessibility:
Section 508 Accessibility; VPAT report available.
QuickSpecs
HP t638 Thin Client
Technical Specifications
c06527271 — 16636— Asia-Pacific — Version 2 — January 14, 2021
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Environmental Stewardship:
Worldwide (ENERGY STAR®, EPEAT® 2019 Silver registered in the United States (except
for some models configured with Fiber Optic NIC networking options)1, RoHS2, ERP,
CECP& SEPA, HP GSE, WEEE, Low Halogen2, etc.)
Product Safety:
Worldwide (UL, CB, CCC, BSMI, etc.)
Electromagnetic Compliance (EMC):
Worldwide (EN/CNS/KCC) “Class B” EMI regulations
International Medical Safety Standard:
EN60601-1-2 (Medical Equipment EMC)
1
Based on US EPEAT® registration according to IEEE 1680.1-2018 EPEAT®. Status varies by country. Visit http://www.epeat.net for more
information.
2
External power supplies, power cords, cables and peripherals are not Low Halogen. Service parts obtained after purchase may not be Low
Halogen.
ENVIRONMENTAL
Operating Temperature Range:
50° to 104° F
10° to 40° C
Non-operating Temperature
Range:
-22° to 140° F
-30° to 60° C
Humidity:
Condensing:
20% to 80%
Non-condensing:
10% to 90%
NOTE: Specifications are at sea level with altitude derating of 1° C/300m (1.8° F/1000ft) to a maximum of 3 Km (10,000 ft), with no direct,
sustained sunlight. Upper limit may be limited by the type and number of options installed.
Basic Configuration :
Energy Consumption
(in accordance with US ENERGY STAR®
test method)
115 V ac, 60 Hz
230 V ac, 50 Hz
100 V ac, 60 Hz
Normal Operation (Short idle)
5.436
5.784
5.388
Normal Operation (Long idle)
4.02
4.356
4.14
Sleep
0.84
0.852
0.854
Off
0.838
0.828
0.852
Heat Dissipation*
115 V ac, 60 Hz
230 V ac, 50 Hz
100 V ac, 60 Hz
Normal Operation (Short idle)
19
20
18
Normal Operation (Long idle)
14
15
14
Sleep
3 3 3
Off
3 3 3
NOTE:Heat dissipation is calculated based on the measured watts, assuming the service level is
attained for one hour.
System configuration includes: Thin Pro - 64bit, 128 GB primary storage and 8 GB of system
memory, USB keyboard & USB mouse
QuickSpecs
HP t638 Thin Client
Summary of Changes
c06527271 — 16636— Asia-Pacific — Version 2 — January 14, 2021
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Date of change:
Version History:
Type of change
Description of change:
January 14, 2021
From v1 to v2
Changed
SOFTWARE SUPPORT section
QuickSpecs
HP t640 Thin Client
c06527271 — 16636— Asia-Pacific — Version 2 — January 14, 2021
Page 11
© 2021 HP Development Company, L.P. The information contained herein is subject to change without notice. The only
warranties for HP products and services are set forth in the express limited warranty statements accompanying such products
and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or
editorial errors or omissions contained herein. DisplayPort™ and the DisplayPort™ logo are trademarks owned by the Video
Electronics Standards Association (VESA®) in the United States and other countries. Amazon Web Services, the “Powered by
Amazon Web Services” logo, and Amazon WorkSpaces are trademarks of Amazon.com, Inc. or its affiliates in the United States
and/or other countries. Bluetooth® is a trademark owned by its proprietor and used by HP Inc. under license. ENERGY STAR is a
registered trademark owned by the U.S. Environmental Protection Agency. Linux® is the registered trademark of Linus Torvalds
in the U.S. and other countries. Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation
in the United States and/or other countries. Intel and Celeron are trademarks of Intel Corporation in the U.S. and other countries.
VMware Horizon and VMware Horizon View are registered trademarks or trademarks of VMware, Inc. in the United States and/or
other jurisdictions. Citrix and Citrix Workspace are trademarks of Citrix Systems, Inc. and/or one more of its subsidiaries, and
may be registered in the United States Patent and Trademark Office and in other countries.
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