Datasheet TS821 Datasheet (ST)

1.225V micropower shunt voltage reference

Features

■ 1.225V typical output voltage

■ Ultra low operating current: 45μA maximum at

25°C

■ High precision @ 25°C

– +/- 2% (standard version)
– +/- 1% (A grade)
– +/- 0. 5% (B grade)

■ High stability when used with capacitive loads

■ Industrial temperature range: -40°C to +85°C

■ 120ppm/°C maximum temperature coefficient

Applications

■ Computers

■ Instrumentation

■ Battery chargers

■ Switch mode power supply

■ Battery operated equipment

TS821

L

SOT23-3L

(Plastic micropackage)

Pin connections

(Top view)

Description

The TS821 is a low power shunt v oltage referen ce
providing a stable 1.225V output voltage over the
industrial temperature range (-40°C to +85°C).
Availabe in SOT23-3 surface mount package, it
can be designed in applications where space
saving is critical.

The low operating current is a key adv antage for
power restricted designs. In addition, the TS821 is
very stable and can be used in a broad range of
application conditions.

July 2007 Rev 2 1/9

www.st.com

9

Absolute maximum ratings and operating conditions TS821

1 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings (AMR)

Symbol Parameter Value Unit

Reverse bre akdown current 20 mA

I

k

I

Forward curren t 10 mA

f

Pow er dissipation

P

d

T

Storage temperature -65 to +150 °C

stg

Human body model (HBM)

ESD

Machine model (MM)

T

1. Pd is calculated with T

2. Human body model: 100pF discharged through a 1.5kΩ resistor between two pins of the device, done for
all couples of pin combinations with other pins floating.

3. Machine model: a 200pF cap is charged to the specified voltage, then discharged directly between two pins
of the device with no external series resistor (internal resistor < 5Ω), done for all couples of pin
combinations with other pins floating.

Table 2. Operating conditions

Lead temperature (soldering, 10 seconds) 260 °C

lead

(1)

SOT23-3

(2)

(3)

= 25°C and Tj = 150°C and R

amb

360 mW

2kV

200 V

= 340°C/W for the SOT23-3L package.

thja

Symbol Parameter Value Unit

I
I

T

Minimum operating current 45 μA

min

Maximum operating current 12 mA

max

Operating free air temperature range -40 to +85 °C

oper

2/9

TS821 Electrical characteristics

2 Electrical characteristics

Table 3. TS821 (2% precision) T

amb

= 25°C

(1)

(unless otherwise specified)

Symbol Parameter Test conditions Min. Typ. Max. Unit

Reverse breakdown voltage Ik = 100μA 1.200 1.225 1.250 V

V

k

Reverse breakdown voltage
tolerance

Minimum operating current

/ΔT Average temperature coefficient Ik = 100μA 120 ppm/°C

Reverse breakdown voltage change

/ΔI

k

with operating current range

Static impedance ΔIk = 45µA to 1mA 0.25 0.5 Ω

ka

Long term stability Ik = 100μA, t = 1000hrs 120 ppm

vh

ΔV

ΔV

I

k-min

ref

k

R

K

En Wide band noise I

1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and
by design.

Table 4. TS821A (1% precision) T

amb

I

= 100μA

k

-40°C < T
T

= 25°C 40 45

amb

-40°C < T

I

< Ik < 1mA

k-min

-40°C < T
1mA < I

-40°C < T

= 100μA, 10H z < f < 10kHz 200 nV/√Hz

k

= 25°C

(1)

< +85°C

amb

< +85°C 50

amb

< +85°C

amb

< 12mA

k

< +85°C

amb

(unless otherwise specified)

-25

+34

0.3 0.7

2.5 8

+25
+34

1

10

mV

μA

mV

Symbol Parameter Test conditions Min. Typ. Max. Unit

Reverse breakdown voltage Ik = 100μA 1.213 1.225 1.237 V

V

k

Reverse breakdown voltage
tolerance

Minimum operating current

/ΔT Average temperature coefficient Ik = 100μA 120 ppm/°C

Reverse breakdown voltage change

/ΔI

k

with operating current range

Static impedance ΔIk = 45μA to 1mA 0.25 0.5 Ω

ka

Long term stability Ik = 100μA, t = 1000hrs 120 ppm

vh

ΔV

ΔV

I

k-min

ref

k

R

K

En Wide band noise I

1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and
by design.

I

= 100μA

k

-40°C < T
T

= 25°C 40 45

amb

-40°C < T

I

< Ik < 1mA

k-min

-40°C < T
1mA < I

-40°C < T

= 100μA 10Hz < f < 10kHz 200 nV/√Hz

k

< +85°C

amb

< +85°C 50

amb

< +85°C

amb

< 12mA

k

< +85°C

amb

-12

-22

+12
+22

0.3 0.7
1

2.5 5
7

mV

μA

mV

3/9

Electrical characteristics TS821

Table 5. TS821B (0.5% precision) T

amb

= 25°C

(1)

(unless otherwise specified)

Symbol Parameter Test conditions Min. Typ. Max. Unit

Reverse breakdown voltage Ik = 100μA 1.219 1.225 1.231 V

V

k

Reverse breakdown voltage
tolerance

Minimum operating current

/ΔT Average temperature coefficient Ik = 100μA 120 ppm/°C

Reverse breakdown voltage change

/ΔI

k

with operating current range

Static impedance ΔIk = 45μA to 1mA 0.25 0.5 W

ka

Long term stability Ik = 100μA, t = 1000hrs 120 ppm

vh

ΔV

ΔV

I

k-min

ref

k

R

K

En Wide band noise I

1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and
by design.

I

= 100μA

k

-40°C < T
T

= 25°C 40 45

amb

-40°C < T

I

< Ik < 1mA

k-min

-40°C < T
1mA < I

-40°C < T

= 100μA 10Hz < f < 10kHz 200 nV/√Hz

k

< +85°C

amb

< +85°C 50

amb

< +85°C

amb

< 12mA

k

< +85°C

amb

-6

-16

+6

+16

0.3 0.7
1

2.5 5
7

mV

μA

mV

4/9

TS821 Electrical characteristics

12

8

4

0

current

Figure 2. Reference voltage versus cathode

current

100

50

Figure 1. Reference voltage versus cathode

0

-4

Cathode current (mA)

-8

Cathode current (µA)

-50

-0.5

-1

-0.5

00.51

Reference voltage (V)

1.5

-1

0

0.5

Reference voltage (V)

1

Figure 3. Test circuit Figure 4. Reference voltage versus

temperature

1.26

R

Ik=(Vin-Vref)/R

Vout=Vref

1.25

1.24

1.23

1.22

1.5

+2%

+1%

+0.5%

Figure 5. Static impedance versus

temperature

0.25

0.24

0.23

0.22

0.21

Static impedance (Ohms)

0.2

-40 -20 0 20 40 60 80
Temperature (°C)

1.21

Cathode voltage (V)

1.2

1.19

-40 -20 0 20 40 60 80
Temperature (°C)

Figure 6. Noise voltage versus frequency

800
700
600
500
400
300
200

Noise voltage (nV/VHz)

100

0

0 1 10 100 1,000 10,000

CL=10µF

CL=100µF

CL=0µF

Frequency (Hz)

-0.5%

-1%

-2%

5/9

Package information TS821

Figure 7. Pulse response for I

3V

0V

1.225V

0V

0246810

Time (µs)

=100µA Figure 8. Test circuit for pulse response at

k

Input

Output

Pulse

Generator

I

=100µA

k

Intput

18 K

Ω

Ik=100µA

Figure 9. Pulse response for Ik=1mA Figure 10. Test circuit for pulse response at

I

=1mA

k

3V

Input

Output

0V

Pulse

Generator

1.225V

0V

1.8 K

Ω

Intput

Ik=1mA

Output

Output

0246810

Time (µs )

3 Package information

In order to meet environmental requirements, STMicroelectronics offers these devices in
ECOPACK
category of second level interconnect is marke d on the pa ckage and on the inner box label,
in compliance with JEDEC Standard JESD97. The maximum ratings related t o soldering
conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics
trademark. ECOPACK specifications are available at: www .st.com

6/9

®

packages. These packages have a lead-free second level interconnect. The

.

TS821 Package information

Figure 11. SOT23-3 package mechanical data

Dimensions

Ref.

Millimeters Mils

Min. Typ. Max. Min. Typ. Max.

A 0.890 1.120 35.05 44.12
A1 0.010 0.100 0.39 3.94
A2 0.880 0.950 1.020 34.65 37.41 40.17

b 0.300 0.500 11.81 19.69

C 0.080 0.200 3.15 7.88
D 2.800 2.900 3.040 110.26 114.17 119.72

E 2.100 2.64 82.70 103.96
E1 1.200 1.300 1.400 47.26 51.19 55.13

e 0.950 37.41
e1 1.900 74.82

L 0.400 0.600 15.75 23.63
L1 0.540 21.27

k0°8°0°8°

7110469/A

7/9

Ordering information TS821

4 Ordering information

Table 6. Order codes

Part number Precision

TS821ILT 2%

TS821AILT 1% L212
TS821BILT 0.5% L211

5 Revision history

Table 7. Document revision history

Date Revision Changes

10-Nov-2005 1 Initial release.

24-Jul-2007 2

Temperature

range

-40°C to
+85°C

Removed information related to TO-92.
Format update.

Package Packing Marking

SOT23-3 Tape & reel

L213

8/9

TS821

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