Voltage Reference, Low Cathode Current, Programmable, Shunt Regulator

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Overview

The NCP431 integrated circuits are three-terminal programmable shunt regulator diodes. They are a direct upgrade to the industry standard TL431A. These monolithic IC voltage references operate as a low temperature coefficient zener which is programmable from Vref to 36 V using two external resistors. These devices exhibit a wide operating current range of 40 µA to 100 mA with a typical dynamic impedance of 0.22Ω. The characteristics of these references make them excellent replacements for zener diodes in many applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.5 V reference makes it convenient to obtain a stable reference from 5.0 V logic supplies, and since the NCP431 operates as a shunt regulator, it can be used as either a positive or negative voltage reference. Low minimum operating current makes this device an ideal choise for secondary regulators in SMPS adapters with extremely low no-load consumption.

The NCP432 has exactly the same functionality and electrical specifications as the NCP431, but has an alternate pin configuration.

  • Switchmode Power Supplies
  • Instrumentation
  • Adapters
  • Flat TVs
  • Low Minimum Operating Current: 40 uA, Typ @ 25C
  • Voltage Reference Tolerance: 1%, Typ @ 25C
  • Programmable Output Voltage to 36 V
  • Low Dynamic Output Impedance, 0.22ohm Typical
  • Temperature Compensated for Operation over Full Rated Operating
    Temperature Range
  • Equivalent FullRange Temperature Coefficient of 50 ppm/C
    Typical
  • NCP431 is pin compatible to the TL432
  • NCP432 is pin compatible to the TL431

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CAD Models

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Package Type

Case Outline

MSL Type

MSL Temp (°C)

Container Type

Container Qty.

ON Target

Type

V(BR) Typ (V)

Tolerance (%)

IQ Typ (mA)

IR Min (mA)

VF Max (V)

TA Min (°C)

TA Max (°C)

Reference Price

NCP431ACDR2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-8

1

260

REEL

2500

N

Adjustable

2.5

1

0.04

0.04

36

0

70

Price N/A

More Details

NCP431ACLPRAG

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Last Shipments

CAD Model

Pb

A

H

P

TO-92

NA

0

REEL

2000

N

Adjustable

2.5

1

0.04

0.04

36

0

70

Price N/A

More Details

NCP431ACSNT1G

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Active

CAD Model

Pb

A

H

P

SOT-23 (TO-236)

1

260

REEL

3000

Y

Adjustable

2.5

1

0.04

0.04

36

0

70

$0.1057

More Details

NCP431AIDR2G

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Last Shipments

CAD Model

Pb

A

H

P

SOIC-8

1

260

REEL

2500

N

Adjustable

2.5

1

0.04

0.04

36

-40

85

Price N/A

More Details

NCP431AILPRAG

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Obsolete

CAD Model

Pb

A

H

P

TO-92

NA

0

REEL

2000

N

Adjustable

2.5

1

0.04

0.04

36

-40

85

Price N/A

More Details

NCP431AISNT1G

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Active

CAD Model

Pb

A

H

P

SOT-23 (TO-236)

1

260

REEL

3000

Y

Adjustable

2.5

1

0.04

0.04

36

-40

85

$0.106

More Details

NCP431AVDR2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-8

1

260

REEL

2500

N

Adjustable

2.5

1

0.04

0.04

36

-40

125

Price N/A

More Details

NCP431AVLPG

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Obsolete

CAD Model

Pb

A

H

P

TO-92

NA

0

BLKBG

2000

N

Adjustable

2.5

1

0.04

0.04

36

-40

125

Price N/A

More Details

NCP431AVLPRAG

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Last Shipments

CAD Model

Pb

A

H

P

TO-92

NA

0

REEL

2000

N

Adjustable

2.5

1

0.04

0.04

36

-40

125

Price N/A

More Details

NCP431AVSNT1G

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Active

CAD Model

Pb

A

H

P

SOT-23 (TO-236)

1

260

REEL

3000

Y

Adjustable

2.5

1

0.04

0.04

36

-40

125

$0.1057

More Details

NCP431BCSNT1G

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Active

CAD Model

Pb

A

H

P

SOT-23 (TO-236)

1

260

REEL

3000

N

Adjustable

2.5

0.5

0.04

0.04

36

0

70

$0.1274

More Details

NCP431BISNT1G

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Active

CAD Model

Pb

A

H

P

SOT-23 (TO-236)

1

260

REEL

3000

Y

Adjustable

2.5

0.5

0.04

0.04

36

-40

85

$0.1284

More Details

NCP431BVSNT1G

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Active

CAD Model

Pb

A

H

P

SOT-23 (TO-236)

1

260

REEL

3000

Y

Adjustable

2.5

0.5

0.04

0.04

36

-40

125

$0.079

More Details

NCP432BCSNT1G

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Active

CAD Model

Pb

A

H

P

SOT-23 (TO-236)

1

260

REEL

3000

N

Adjustable

2.5

0.5

0.04

0.04

36

0

70

$0.1025

More Details

NCP432BISNT1G

Loading...

Active

CAD Model

Pb

A

H

P

SOT-23 (TO-236)

1

260

REEL

3000

N

Adjustable

2.5

0.5

0.04

0.04

36

-40

85

$0.1067

More Details

NCP432BVSNT1G

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Active

CAD Model

Pb

A

H

P

SOT-23 (TO-236)

1

260

REEL

3000

N

Adjustable

2.5

0.5

0.04

0.04

36

-40

125

$0.1173

More Details

SC431AVSNT1G

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Active

CAD Model

Pb

A

H

P

SOT-23 (TO-236)

1

260

REEL

3000

Y

Adjustable

2.5

1

0.04

0.04

36

-40

125

$0.1867

More Details

SC431BVSNT1G

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Active

CAD Model

Pb

A

H

P

SOT-23 (TO-236)

1

260

REEL

3000

Y

Adjustable

2.5

0.5

0.04

0.04

36

-40

125

$0.2

More Details

SC432BVSNT1G

Loading...

Active

CAD Model

Pb

A

H

P

SOT-23 (TO-236)

1

260

REEL

3000

Y

Adjustable

2.5

0.5

0.04

0.04

36

-40

125

$0.2

More Details

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