The HA17431 series is a family of voltage referenced shunt regulators. The main application of these
products is in voltage regulators that provide a variable output voltage. The HA17431 series products are
provided in a wide range of packages; TO-92 and TO-92MOD insertion mounting packages and MPAK-5,
UPAK, and FP-8D surface mounting packages are available. The on-chip high-precision reference voltage
source can provide ±1% accuracy in the V versions, which have a VKA max of 16 volts. The
HA17431VLP, which is provided in the MPAK-5 package, is designed for use in switching mode power
supplies. It provides a built-in photocoupler bypass resistor for the PS pin, and an error amplifier can be
easily constructed on the supply side.
Features
• The V versions provide 2.500 V ±1% at Ta = 25°C
• The HA17431VLP includes a photocoupler bypass resistor (2 kΩ)
• The reference voltage has a low temperature coefficient
• The MPAK-5 and UPAK miniature packages are optimal for use on high mounting density circuit
boards
• A wide operating temperature range (–40 to +85°C) is provided by the TO-92, TO-92MOD, and FP-8D
package versions
Block Diagram
KPS*
2kΩ
REF
2.500V
Note: * The PS pin is only provided by the HA17431VLP.
+
−
A
HA17431 Series
Application Circuit Example
Switching power supply secondary-side error amplification circuit
Vout
R
R
+
K
–
HA17431VLP
PS
2kΩ
REF
A
Ordering Information
Version
ItemV VersionA Version
ReferenceAccuracy±1% (at 25°C)±2.2%±4%
voltageMax2.525 V2.550 V2.595 V
Typ2.500 V2.495 V2.495 V
Min2.475 V2.440 V2.395 V
Cathode voltage16 V max40 V max40 V max
Cathode current50 mA max150 mA max150 mA max
Wide temperature useHA17431VPJHA17431PNAJTO-92–40 to +85°C
2. Imin is given by the cathode current at Vref = Vref
3. R
is only provided in HA17431VLP.
PS
Ta Max
(IK=10mA)
4. The maximum value is a design value (not measured).
– 15 mV.
7
HA17431 Series
MPAK-5 and UPAK Marking Patterns
The marking patterns shown below are used on MPAK-5 and UPAK products. Note that the product code
and mark pattern are different. The pattern is laser-printed.
HA17431VLPHA17431UA
NCPS
(1)
(2)
P4
(a)
(b)
REFAK
REF
(4)
(c)
AA
Band mark
K
4A
(1) (2)
(3) (4)
(5)
HA17431UPA
REF
AA
Band mark
K
4B
(1) (2)
(3) (4)
(5)
HA17432UA
K
A
Band mark
REF
4C
(1) (2)
(3) (4)
HA17432UPA
K
A
A
Band mark
REF
(5)
4F
(1) (2)
(3) (4)
(5)
Notes: 1. Boxes (1) to (5) in the figures show the position of the letters or numerals, and are not actually
marked on the package.
2. The letters (1) and (2) show the product specific mark pattern.
Product(1)(2)