SPX432AM-L Equivalent & Substitute Parts

Part Overview

The SPX432AM-L is a shunt voltage reference IC manufactured by MaxLinear, Inc., designed for adjustable output applications in power management circuits. This component provides a fixed 1.24V reference with adjustable output up to 18V, delivering 80 mA output current with ±0.5% tolerance in a SOT-23-3 surface mount package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements.

Key Parameters

Parameter	SPX432AM-L
Manufacturer	MaxLinear, Inc.
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	1.24V
Voltage - Output (Max)	18V
Current - Output	80 mA
Tolerance	±0.5%
Temperature Coefficient	50 ppm/°C
Current - Cathode	1 mA
Operating Temperature	0°C ~ 105°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SPX432AM-L is determined by the following critical parameters:

Reference Type: Shunt voltage reference architecture
Output Type: Adjustable output configuration
Voltage Range: Minimum fixed output of 1.24V with maximum output capability
Output Current: Minimum current delivery requirement
Tolerance: Voltage accuracy specification
Package: SOT-23-3 surface mount form factor
Operating Temperature Range: Functional temperature limits
Compliance: RoHS and regulatory certifications

Substitute parts must maintain compatibility across these parameters. Parts are grouped by tolerance specification (±0.5% vs. ±1%) and maximum output current capability, as these directly impact circuit performance and design margins.

Parameter Comparison

Parameter	SPX432AM-L	LMV431AIMF	LMV431AIMF/NOPB	LMV431AIMFX	LMV431AIMFX/NOPB	TLVH432BCDBZR	TLVH432BIDBZR	TLVH432CDBZR	TLVH432CDBZT
Manufacturer	MaxLinear	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Reference Type	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	1.24V	1.24V	1.24V	1.24V	1.24V	1.24V	1.24V	1.24V	1.24V
Voltage - Output (Max)	18V	30V	30V	30V	30V	18V	18V	18V	18V
Current - Output	80 mA	15 mA	15 mA	15 mA	15 mA	70 mA	70 mA	70 mA	70 mA
Tolerance	±0.5%	±1%	±1%	±1%	±1%	±0.5%	±0.5%	±1.5%	±1.5%
Current - Cathode	1 mA	80 µA	80 µA	80 µA	80 µA	100 µA	100 µA	100 µA	100 µA
Operating Temperature	0°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Last Time Buy	Active	Last Time Buy	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (±0.5% Tolerance Match):

TLVH432BCDBZR and TLVH432BIDBZR are direct functional equivalents to SPX432AM-L, maintaining the same ±0.5% tolerance specification and 18V maximum output voltage. Both are manufactured by Texas Instruments with ROHS3 compliance. TLVH432BIDBZR offers extended operating temperature range (-40°C ~ 85°C) compared to TLVH432BCDBZR (0°C ~ 70°C), providing broader application flexibility. Current output is 70 mA versus the original 80 mA, representing a 12.5% reduction in available output current.

Secondary Substitutes (±1% Tolerance):

LMV431AIMF/NOPB is the recommended Texas Instruments alternative when tolerance relaxation to ±1% is acceptable. This part maintains Active product status with the highest inventory availability (54,833 pcs). The extended operating temperature range (-40°C ~ 85°C) and 30V maximum output voltage provide design margin advantages. Output current is limited to 15 mA, suitable only for low-current reference applications.

Tolerance Trade-off Option (±1.5% Tolerance):

TLVH432CDBZR and TLVH432CDBZT provide 18V maximum output voltage matching with relaxed ±1.5% tolerance. These parts are suitable for applications where voltage accuracy requirements are less stringent than the original specification.

All substitute parts maintain SOT-23-3 package compatibility, surface mount configuration, and RoHS compliance required for direct board-level replacement.

Frequently Asked Questions (FAQ)

Q: Can LMV431AIMF/NOPB directly replace SPX432AM-L in all applications?

A: LMV431AIMF/NOPB is functionally compatible for shunt voltage reference applications requiring adjustable output. However, three parameter differences must be evaluated: (1) tolerance relaxes from ±0.5% to ±1%, (2) output current reduces from 80 mA to 15 mA, and (3) maximum output voltage increases from 18V to 30V. Applications requiring the full 80 mA output current or ±0.5% accuracy must use TLVH432BCDBZR or TLVH432BIDBZR instead.

Q: What is the difference between TLVH432BCDBZR and TLVH432BIDBZR?

A: Both parts share identical electrical specifications (±0.5% tolerance, 18V maximum output, 70 mA output current). The primary difference is operating temperature range: TLVH432BCDBZR operates 0°C ~ 70°C, while TLVH432BIDBZR extends to -40°C ~ 85°C. Select TLVH432BIDBZR for applications requiring extended low-temperature operation or broader environmental specifications.

Q: Why do substitute parts show lower output current than SPX432AM-L?

A: Output current capability is a fundamental design parameter of each reference IC. TLVH432 series delivers 70 mA (12.5% reduction), while LMV431 series delivers 15 mA (81% reduction). Circuit designs must be evaluated to confirm that substitute part current ratings meet application requirements. If full 80 mA output is critical, TLVH432BCDBZR or TLVH432BIDBZR provide the closest match.

Q: Are all substitute parts available in the same packaging?

A: All listed substitutes use SOT-23-3 surface mount packaging, identical to SPX432AM-L. Packaging variants (Cut Tape, Tape & Reel, Digi-Reel) affect procurement and handling but do not impact electrical or mechanical compatibility on the circuit board.

Q: Which substitute offers the best long-term availability?

A: LMV431AIMFX/NOPB and LMV431AIMF/NOPB maintain Active product status with the highest inventory levels (54,833 and 16,116 pcs respectively). TLVH432 series parts are also Active but with lower inventory. For new designs, Active status parts are recommended over Last Time Buy alternatives.

Q: Can tolerance differences affect circuit performance?

A: Yes. The original SPX432AM-L specifies ±0.5% tolerance, while most substitutes relax to ±1% or ±1.5%. Applications with tight voltage regulation requirements or precision analog circuits must account for this increased tolerance band. Designs with adequate margin can accommodate the relaxed tolerance without performance impact.

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