AS431IAZTR-G1 Equivalent & Substitute Parts

Part Overview

The AS431IAZTR-G1 is a shunt voltage reference IC manufactured by Diodes Incorporated, classified as a Power Management (PMIC) component. This adjustable reference device operates across a 2.5V to 36V output range with ±0.5% tolerance and supports 100 mA output current in a TO-92 through-hole package. The part is currently active in production with 56,350 units in stock.

Substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers are preferred for supply chain diversification, or when design requirements allow for tolerance or performance variations within acceptable engineering parameters.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.5%
Current - Cathode	50 µA
Operating Temperature	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	TO-92-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AS431IAZTR-G1 is determined by the following critical parameters:

Reference Type: Must be Shunt
Output Type: Must be Adjustable
Voltage Range: Output maximum must be 36V; minimum output must support 2.5V operation
Current - Output: Must support minimum 100 mA
Package: Must be TO-92-3 through-hole configuration
Mounting Type: Must be Through Hole

Tolerance variations (±0.5%, ±1%, ±2%, ±0.25%) are acceptable substitution criteria when design specifications permit. Operating temperature ranges may vary; however, the substitute must cover the application's required temperature window. Cathode current specifications may differ without affecting substitution validity.

Parameter Comparison

Part Number	Manufacturer	Reference Type	Output Type	Voltage Min	Voltage Max	Current Output	Tolerance	Operating Temp	Package	Status
AS431IAZTR-G1	Diodes Incorporated	Shunt	Adjustable	2.5V	36V	100 mA	±0.5%	-40°C ~ 125°C	TO-92-3	Active
FAN431AZXA	Fairchild Semiconductor	Shunt	Adjustable	2.495V	36V	100 mA	±1%	-25°C ~ 85°C	TO-92-3	Active
KA431AZTA	onsemi	Shunt	Adjustable	2.495V	36V	100 mA	±1%	-25°C ~ 85°C	TO-92-3	Active
KA431LZTA	onsemi	Shunt	Adjustable	2.495V	36V	100 mA	±0.5%	-25°C ~ 85°C	TO-92-3	Active
LM431ACZX	Fairchild Semiconductor	Shunt	Adjustable	2.5V	36V	100 mA	±2%	-25°C ~ 85°C	TO-92-3	Active
LM431BCZX	onsemi	Shunt	Adjustable	2.495V	36V	100 mA	±1%	-25°C ~ 85°C	TO-92-3	Active
LM431BCZXA	onsemi	Shunt	Adjustable	2.495V	36V	100 mA	±1%	-25°C ~ 85°C	TO-92-3	Active
LM431BIZX	onsemi	Shunt	Adjustable	2.495V	36V	100 mA	±1%	-40°C ~ 85°C	TO-92-3	Active
NCP431AVLPRAG	onsemi	Shunt	Adjustable	2.5V	36V	40 µA	±1%	-40°C ~ 125°C	TO-92	Obsolete
TL1431ACZ-AP	STMicroelectronics	Shunt	Adjustable	2.5V	36V	100 mA	±0.25%	-20°C ~ 70°C	TO-92-3	Active
TL1431ACZT	STMicroelectronics	Shunt	Adjustable	2.5V	36V	100 mA	±0.25%	-20°C ~ 70°C	TO-92-3	Active

Engineering Selection Recommendations

All listed substitute parts maintain active production status except NCP431AVLPRAG, which is obsolete and not recommended for new designs. All active substitutes are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

For applications requiring the full -40°C to 125°C operating range of the AS431IAZTR-G1, only LM431BIZX and NCP431AVLPRAG extend to -40°C minimum. LM431BIZX is the preferred choice as it maintains active status.

For applications with relaxed temperature requirements (-25°C to 85°C), FAN431AZXA, KA431AZTA, KA431LZTA, LM431ACZX, LM431BCZX, and LM431BCZXA are suitable alternatives.

TL1431ACZ-AP and TL1431ACZT offer superior tolerance (±0.25%) but operate only to -20°C minimum and 70°C maximum, limiting their use to narrower temperature windows.

KA431LZTA matches the ±0.5% tolerance of the AS431IAZTR-G1 while providing onsemi manufacturing and active status.

Frequently Asked Questions (FAQ)

Q: Can NCP431AVLPRAG be used as a substitute despite obsolete status? A: NCP431AVLPRAG is obsolete and should not be selected for new designs. Active alternatives with equivalent or superior specifications are available.

Q: What is the significance of cathode current differences between parts? A: Cathode current (50 µA for AS431IAZTR-G1 versus 1 mA for most substitutes, or 600 µA for TL1431 variants) affects circuit biasing requirements but does not prevent substitution. Circuit design must accommodate the specific cathode current of the selected part.

Q: Are all substitutes pin-compatible with AS431IAZTR-G1? A: All listed substitutes use TO-92-3 packaging except NCP431AVLPRAG, which uses TO-92 (long body). Pin compatibility is maintained for TO-92-3 variants. Physical lead configuration should be verified before installation.

Q: How do tolerance variations affect circuit performance? A: The AS431IAZTR-G1 specifies ±0.5% tolerance. Substitutes with ±1% or ±2% tolerance introduce wider output voltage variation. Substitutes with ±0.25% tolerance (TL1431 series) provide tighter control. Selection depends on application voltage regulation requirements.

Q: Which substitute offers the best temperature coverage? A: LM431BIZX covers -40°C to 85°C, matching the lower temperature limit of AS431IAZTR-G1. For full -40°C to 125°C coverage, only the original part and obsolete NCP431AVLPRAG are available.

Q: Can substitutes with 2.495V minimum output replace a 2.5V part? A: The 0.005V difference is negligible in most applications. Substitutes with 2.495V minimum output are functionally equivalent for circuits designed around 2.5V reference operation.

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