LA431NHPA Equivalent & Substitute Parts

Part Overview

The LA431NHPA is a shunt voltage reference IC manufactured by Diodes Incorporated, classified as a Power Management (PMIC) component. This adjustable shunt regulator provides a fixed output voltage of 2.495V with a maximum rating of 36V and supports output currents up to 100 mA. The device is packaged in TO-92 through-hole configuration and operates across the industrial temperature range of -40°C to 125°C.

The LA431NHPA is currently listed as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±1%
Current - Cathode	300 µA
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LA431NHPA is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Requirements:

Reference type must be shunt
Output type must be adjustable
Maximum output voltage rating must be ≥36V
Output current capability must be ≥100 mA
Operating temperature range must encompass -40°C to 125°C
Tolerance specification must be ≤±1%

Mechanical Compatibility Requirements:

Mounting type must be through hole
Package must be TO-92 or equivalent TO-226-3 configuration

Regulatory Compliance:

RoHS3 compliance required
ECCN and HTSUS classifications must align

The AZ431BZ-ATRG1 meets all substitution criteria as an active product from the same manufacturer with superior electrical characteristics and equivalent mechanical packaging.

Parameter Comparison

Parameter	LA431NHPA	AZ431BZ-ATRG1	Compatibility
Manufacturer	Diodes Incorporated	Diodes Incorporated	Match
Reference Type	Shunt	Shunt	Match
Output Type	Adjustable	Adjustable	Match
Voltage - Output (Min/Fixed)	2.495V	2.5V	Compatible
Voltage - Output (Max)	36V	36V	Match
Current - Output	100 mA	100 mA	Match
Tolerance	±1%	±0.8%	Compatible (Superior)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	Match
Mounting Type	Through Hole	Through Hole	Match
Package / Case	TO-92-3	TO-92-3	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Product Status	Obsolete	Active	Upgrade Path

Engineering Selection Recommendations

The AZ431BZ-ATRG1 is the direct substitute for the LA431NHPA based on the following engineering criteria:

Electrical Equivalence: The AZ431BZ-ATRG1 maintains all critical electrical specifications required for direct substitution. The minimum output voltage differs by 0.005V (2.495V vs. 2.5V), which is within typical circuit tolerance margins for adjustable shunt regulators. The tolerance specification of ±0.8% is superior to the original ±1%, providing improved voltage regulation accuracy.

Mechanical Compatibility: Both devices utilize identical TO-92-3 through-hole packaging with formed leads, ensuring pin-for-pin compatibility without PCB modifications.

Regulatory Compliance: The AZ431BZ-ATRG1 maintains ROHS3 compliance and carries identical ECCN and HTSUS classifications, satisfying all regulatory requirements of the original component.

Product Status and Supply: The AZ431BZ-ATRG1 is an active product with substantial inventory availability (261,100 pieces), eliminating obsolescence risk associated with the LA431NHPA. This substitution provides a sustainable long-term supply solution.

Thermal Performance: The AZ431BZ-ATRG1 includes a specified temperature coefficient of 20ppm/°C typical, providing quantified thermal stability information absent from the original part specification.

Frequently Asked Questions (FAQ)

Q: Can the AZ431BZ-ATRG1 be used as a direct replacement for the LA431NHPA without circuit modifications?

A: Yes. The AZ431BZ-ATRG1 is pin-for-pin compatible in TO-92-3 packaging and maintains electrical specifications within acceptable substitution parameters. No PCB layout changes are required.

Q: What is the significance of the 0.005V difference in minimum output voltage (2.495V vs. 2.5V)?

A: This difference is negligible for adjustable shunt regulator applications. The output voltage is typically set by external resistor networks, and the 0.005V variance falls within standard circuit tolerance budgets. Both devices support the full 2.5V to 36V adjustable range.

Q: Why is the AZ431BZ-ATRG1 tolerance specification (±0.8%) superior to the LA431NHPA (±1%)?

A: The tighter tolerance of ±0.8% indicates improved manufacturing process control and voltage regulation accuracy. This provides enhanced performance for precision voltage reference applications without requiring circuit redesign.

Q: Is the AZ431BZ-ATRG1 available in the same packaging format?

A: Yes. Both devices are packaged in TO-92-3 (TO-226AA) with formed leads. The AZ431BZ-ATRG1 is supplied in cut tape (CT) packaging format, which is standard for active production components.

Q: What is the difference in cathode current between these devices?

A: The LA431NHPA specifies 300 µA cathode current, while the AZ431BZ-ATRG1 specifies 1 mA. This difference reflects improved bias current characteristics in the newer design and does not affect substitution compatibility for standard applications.

Q: Are there any compliance or certification differences between these parts?

A: Both devices are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. The AZ431BZ-ATRG1 includes additional REACH unaffected status and MSL-1 moisture sensitivity rating, indicating enhanced supply chain documentation.

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