SPX2431AM-L Equivalent & Substitute Parts

Part Overview

The SPX2431AM-L is a shunt voltage reference IC manufactured by MaxLinear, Inc., designed for adjustable output voltage applications in power management circuits. This component provides a 2.5V to 20V adjustable output with ±0.5% tolerance and 100 mA output current capability in a compact SOT-23-3 surface mount package. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and design requirements.

Key Parameters

Parameter	SPX2431AM-L
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	20V
Current - Output	100 mA
Tolerance	±0.5%
Temperature Coefficient	30ppm/°C
Current - Cathode	1 mA
Operating Temperature	0°C ~ 105°C
Package / Case	SOT-23-3
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SPX2431AM-L is determined by the following critical parameters:

Reference Type & Output Type: All substitutes must be shunt voltage reference ICs with adjustable output
Voltage Range: Output voltage range must encompass 2.5V to 20V
Current Rating: Output current must be 100 mA minimum
Package: All substitutes must use SOT-23-3 surface mount package
Tolerance & Temperature Coefficient: Tolerance of ±0.5% or better is preferred; temperature coefficient affects long-term stability
Cathode Current: Lower cathode current reduces power consumption in reference circuits
Operating Temperature Range: Extended temperature ranges provide greater design flexibility
Product Status & Compliance: Active status ensures ongoing availability; RoHS3 compliance meets current regulatory requirements

Substitute parts are grouped by tolerance specification, as this directly impacts circuit accuracy and application suitability.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Temp Coeff (ppm/°C)	Cathode Current	Operating Temp Range	Product Status	Packaging
SPX2431AM-L	MaxLinear, Inc.	±0.5%	30	1 mA	0°C ~ 105°C	Discontinued	SOT-23-3
ZTL432BFTA	Diodes Incorporated	±0.5%	—	600 µA	-40°C ~ 125°C	Active	SOT-23-3
ZR431F005TA	Diodes Incorporated	±0.5%	55	50 µA	-40°C ~ 85°C	Active	SOT-23-3
ZHT431F01TA	Diodes Incorporated	±1%	67	50 µA	-55°C ~ 125°C	Active	SOT-23-3
ZR431F01TA	Diodes Incorporated	±1%	55	50 µA	-40°C ~ 85°C	Active	SOT-23-3
ZTL432AFTA	Diodes Incorporated	±1%	—	600 µA	-40°C ~ 125°C	Active	SOT-23-3
ZHT431F02TA	Diodes Incorporated	±2%	67	50 µA	-55°C ~ 125°C	Active	SOT-23-3
ZR431FTA	Diodes Incorporated	±2%	55	50 µA	-40°C ~ 85°C	Active	SOT-23-3

Engineering Selection Recommendations

Primary Substitutes (±0.5% Tolerance)

ZR431F005TA is the closest functional equivalent to SPX2431AM-L. Both maintain ±0.5% tolerance and 100 mA output current. ZR431F005TA offers superior cathode current efficiency (50 µA vs. 1 mA), reducing power consumption in reference circuits. The part is actively manufactured by Diodes Incorporated with ROHS3 compliance and unlimited moisture sensitivity rating. Operating temperature range of -40°C to 85°C covers the original part's 0°C to 105°C specification for most industrial applications.

ZTL432BFTA provides ±0.5% tolerance with extended operating temperature range (-40°C to 125°C) and RoHS3 compliance. Higher cathode current (600 µA) may increase power consumption in low-current reference applications but ensures robust performance in demanding environments.

Secondary Substitutes (±1% Tolerance)

ZHT431F01TA and ZR431F01TA both provide ±1% tolerance with active product status and RoHS3 compliance. ZHT431F01TA offers the widest operating temperature range (-55°C to 125°C) and lowest cathode current (50 µA), suitable for extended temperature applications. ZR431F01TA maintains -40°C to 85°C range with equivalent cathode current performance.

Tertiary Substitutes (±2% Tolerance)

ZHT431F02TA and ZR431FTA are suitable only for applications where ±2% tolerance is acceptable. Both maintain 100 mA output current and SOT-23-3 packaging. ZHT431F02TA provides the widest temperature range (-55°C to 125°C).

All substitute parts are manufactured by Diodes Incorporated with active product status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can ZR431F005TA directly replace SPX2431AM-L in existing designs?

A: Yes, for applications operating within -40°C to 85°C. Both parts maintain ±0.5% tolerance, 2.5V to 20V output range, 100 mA output current, and SOT-23-3 packaging. If your design requires operation above 85°C, ZTL432BFTA (-40°C to 125°C) is recommended.

Q: What is the impact of different cathode current specifications?

A: Cathode current determines the minimum bias current required to maintain regulation. SPX2431AM-L requires 1 mA cathode current, while most Diodes Incorporated substitutes require only 50 µA. Lower cathode current reduces power consumption in the reference circuit. ZTL432BFTA and ZTL432AFTA require 600 µA, which is higher than the original but still within acceptable ranges for most applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. SPX2431AM-L is RoHS Compliant. All Diodes Incorporated substitutes carry ROHS3 Compliant certification, meeting current regulatory requirements for electronic components.

Q: Which substitute offers the best temperature stability?

A: ZR431F005TA and ZR431F01TA both specify 55 ppm/°C temperature coefficient, compared to SPX2431AM-L's 30 ppm/°C. For applications requiring superior temperature stability, ZHT431F01TA and ZHT431F02TA specify 67 ppm/°C. Temperature coefficient data is not provided for ZTL432BFTA and ZTL432AFTA.

Q: Can I use a ±1% or ±2% tolerance part in place of ±0.5%?

A: Substitution depends on circuit requirements. If your design specifies ±0.5% tolerance for voltage regulation accuracy, only ZR431F005TA or ZTL432BFTA are suitable. ±1% and ±2% parts introduce greater output voltage variation and are appropriate only for applications with relaxed tolerance requirements.

Q: What packaging options are available for these substitutes?

A: All substitutes use SOT-23-3 surface mount package. Packaging format varies: ZTL432BFTA, ZHT431F01TA, and ZR431F01TA are supplied in Cut Tape (CT) & Digi-Reel format. ZR431F005TA, ZR431FTA, and ZTL432AFTA are supplied in Tape & Reel (TR) format. Select based on your procurement and assembly requirements.

Q: Is moisture sensitivity a concern for these parts?

A: No. SPX2431AM-L and all substitute parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity limitations during storage or handling.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message