SPX432M-L Equivalent & Substitute Parts

Part Overview

The SPX432M-L is a shunt voltage reference IC manufactured by MaxLinear, Inc., designed for adjustable voltage regulation applications. This component provides a fixed 1.24V output with ±1% tolerance and supports output currents up to 80 mA across a maximum input voltage range of 18V. The part is packaged in SOT-23-3 (TO-236-3) surface mount configuration with unlimited moisture sensitivity rating (MSL 1).

The SPX432M-L has been discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. Substitute parts must maintain compatibility with the original electrical specifications and mechanical packaging requirements to ensure direct replacement capability in existing designs.

Key Parameters

Parameter	SPX432M-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	±1%
Current - Cathode	1 mA
Operating Temperature	0°C ~ 105°C
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SPX432M-L are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Reference Type: Shunt (all substitutes maintain this topology)
Output Type: Adjustable (all substitutes provide adjustable output)
Voltage - Output (Min/Fixed): 1.24V (all substitutes match this fixed reference point)
Package / Case: TO-236-3, SC-59, SOT-23-3 (all substitutes use identical surface mount packaging)
Mounting Type: Surface Mount (all substitutes are surface mount compatible)

Secondary Compatibility Parameters:

Tolerance: ±1% or better (substitutes with ±0.5% tolerance provide improved accuracy)
Voltage - Output (Max): 18V or higher (substitutes rated to 30V provide extended voltage headroom)
Current - Output: 80 mA or higher (substitutes must support required output current)
Operating Temperature: Range must encompass application requirements
RoHS Status: All substitutes maintain RoHS3 compliance

Substitutes are organized into two functional groups: Texas Instruments LMV431 series (30V rated, lower output current) and Texas Instruments TLVH432 series (18V rated, higher output current and improved tolerance options).

Parameter Comparison

Parameter	SPX432M-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	±1%	±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	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Discontinued	Last Time Buy	Active	Last Time Buy	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Replacement Priority:

For applications requiring maximum output current (80 mA) with 18V maximum voltage rating, the TLVH432 series provides the closest electrical match. TLVH432BCDBZR and TLVH432BIDBZR offer ±0.5% tolerance with 70 mA output current capability. TLVH432BIDBZR is preferred for extended temperature range applications (-40°C ~ 85°C) and carries Active product status, ensuring long-term availability.

Alternative Selection:

The LMV431 series from Texas Instruments provides extended voltage headroom (30V maximum) at the cost of reduced output current (15 mA). These parts are suitable for applications where output current requirements do not exceed 15 mA. LMV431AIMF/NOPB carries Active product status with ROHS3 compliance and unlimited MSL rating.

Product Status Considerations:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) ratings. TLVH432BIDBZR, TLVH432CDBZR, TLVH432CDBZT, and LMV431AIMF/NOPB carry Active product status, indicating ongoing manufacturing and supply availability. Parts designated as Last Time Buy (LMV431AIMF, LMV431AIMFX, TLVH432BCDBZR) have limited remaining inventory and should be evaluated for long-term design viability.

Frequently Asked Questions (FAQ)

Q: Can LMV431AIMF/NOPB directly replace SPX432M-L in all applications?

A: LMV431AIMF/NOPB maintains identical reference voltage (1.24V), tolerance (±1%), and packaging (SOT-23-3). However, output current is limited to 15 mA versus 80 mA for the original part. Direct replacement is possible only in applications where output current does not exceed 15 mA. The extended voltage rating (30V vs. 18V) provides additional design margin.

Q: What is the difference between TLVH432BCDBZR and TLVH432BIDBZR?

A: Both parts provide identical electrical specifications: 1.24V adjustable output, ±0.5% tolerance, 70 mA output current, and SOT-23-3 packaging. The primary difference is operating temperature range: TLVH432BCDBZR operates 0°C ~ 70°C, while TLVH432BIDBZR extends to -40°C ~ 85°C. TLVH432BIDBZR is recommended for applications requiring extended temperature performance.

Q: Why do some substitutes have lower output current (15 mA vs. 80 mA)?

A: The LMV431 series represents a different product line within Texas Instruments' voltage reference portfolio. While electrically compatible for reference voltage generation, these parts are designed for lower current applications. Selection depends on circuit requirements. Applications requiring 80 mA output current must use TLVH432 series parts.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed carry ROHS3 compliance certification. The original SPX432M-L carries RoHS Compliant status. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating, indicating no special handling requirements during storage or assembly.

Q: Which substitute offers the best tolerance specification?

A: TLVH432BCDBZR and TLVH432BIDBZR provide ±0.5% tolerance, superior to the original SPX432M-L specification of ±1%. These parts are suitable for applications requiring tighter voltage reference accuracy. TLVH432CDBZR and TLVH432CDBZT offer ±1.5% tolerance, which is less stringent than the original specification.

Q: What is the significance of the "/NOPB" suffix in part numbers?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging designation. LMV431AIMF/NOPB and LMV431AIMFX/NOPB are lead-free variants meeting RoHS requirements. This designation does not affect electrical performance or compatibility; it indicates manufacturing process compliance.

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