LM431CCM3 Equivalent & Substitute Parts

Part Overview

The LM431CCM3 is a shunt voltage reference IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This adjustable reference provides a 2.5V to 37V output with ±0.6%/+0.4% tolerance in a SOT-23-3 surface mount package. The LM431CCM3 carries an obsolete product status, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	37V
Current - Output	100 mA
Tolerance	-0.6%, +0.4%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the LM431CCM3 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Reference Type: Shunt
Output Type: Adjustable
Voltage Output Range: Minimum 2.5V, Maximum 37V
Current Output: 100 mA
Package: SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount

Tolerance and Performance Considerations:

Tolerance: ±0.6%/+0.4% or tighter
Temperature Coefficient: 50ppm/°C or lower
Current - Cathode: 1 mA or compatible

Substitute parts are grouped into two categories: direct manufacturer equivalents from Texas Instruments and manufacturer-recommended alternatives from other suppliers that meet or exceed the electrical specifications.

Parameter Comparison

Parameter	LM431CCM3	LM431CCM3/NOPB	LM431CCM3X/NOPB	AS431HMANTR-G1
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Diodes Incorporated
Product Status	Obsolete	Active	Active	Active
Reference Type	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	2.5V	2.5V	2.5V	2.495V
Voltage - Output (Max)	37V	37V	37V	36V
Current - Output	100 mA	100 mA	100 mA	100 mA
Tolerance	-0.6%, +0.4%	-0.6%, +0.4%	-0.6%, +0.4%	±0.5%
Temperature Coefficient	50ppm/°C Typical	50ppm/°C Typical	50ppm/°C Typical	20ppm/°C Typical
Current - Cathode	1 mA	1 mA	1 mA	500 µA
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	-40°C ~ 125°C (TA)
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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Texas Instruments):

LM431CCM3/NOPB and LM431CCM3X/NOPB are direct substitutes for the obsolete LM431CCM3. Both parts maintain identical electrical specifications and package configuration. These parts carry Active product status and ROHS3 compliance, making them suitable for new designs and production environments requiring RoHS certification. The primary distinction between these two variants is packaging format (Cut Tape & Digi-Reel®), which does not affect electrical performance or pin compatibility.

Manufacturer-Recommended Alternative (Diodes Incorporated):

AS431HMANTR-G1 is a manufacturer-recommended substitute from Diodes Incorporated. This part meets the core electrical requirements with equivalent 100 mA output current and SOT-23-3 package. The AS431HMANTR-G1 offers improved performance characteristics: ±0.5% tolerance (tighter than the original -0.6%/+0.4%), lower temperature coefficient (20ppm/°C vs. 50ppm/°C), and extended operating temperature range (-40°C to 125°C vs. 0°C to 70°C). The maximum output voltage is 36V, which is 1V lower than the original specification. Current - Cathode is 500 µA, lower than the original 1 mA specification. ROHS3 compliance and MSL-3 rating are provided.

Selection Criteria:

For direct replacement in existing designs, select LM431CCM3/NOPB or LM431CCM3X/NOPB. For new designs requiring enhanced performance specifications and extended temperature range, AS431HMANTR-G1 is suitable provided the 36V maximum output voltage and 500 µA cathode current are compatible with circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can LM431CCM3/NOPB be used as a direct replacement for LM431CCM3?

A: Yes. LM431CCM3/NOPB is electrically and mechanically identical to LM431CCM3. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Pin configuration, electrical specifications, and SOT-23-3 package are unchanged.

Q: What is the difference between LM431CCM3/NOPB and LM431CCM3X/NOPB?

A: Both parts are electrically identical with matching specifications and Active product status. The difference is packaging format: LM431CCM3/NOPB and LM431CCM3X/NOPB are supplied in Cut Tape (CT) & Digi-Reel® format. This affects procurement and handling but not electrical performance or compatibility.

Q: Can AS431HMANTR-G1 replace LM431CCM3 in all applications?

A: AS431HMANTR-G1 is compatible for most applications but requires verification of two parameters: maximum output voltage (36V vs. 37V) and cathode current (500 µA vs. 1 mA). If the circuit design operates within these limits, AS431HMANTR-G1 is suitable. The improved tolerance (±0.5%), lower temperature coefficient (20ppm/°C), and extended temperature range (-40°C to 125°C) provide performance advantages.

Q: Are all substitute parts available in SOT-23-3 package?

A: Yes. LM431CCM3/NOPB, LM431CCM3X/NOPB, and AS431HMANTR-G1 are all supplied in SOT-23-3 package (TO-236-3, SC-59). Pin configuration and footprint are identical, enabling direct PCB compatibility.

Q: What is the significance of RoHS compliance for these parts?

A: LM431CCM3 is RoHS non-compliant. LM431CCM3/NOPB, LM431CCM3X/NOPB, and AS431HMANTR-G1 are ROHS3 compliant. For applications or markets requiring RoHS certification, the compliant alternatives must be selected.

Q: How does moisture sensitivity level (MSL) affect component handling?

A: LM431CCM3, LM431CCM3/NOPB, and LM431CCM3X/NOPB carry MSL-1 (Unlimited), indicating no moisture sensitivity restrictions. AS431HMANTR-G1 carries MSL-3 (168 Hours), requiring storage in controlled humidity environments and baking before reflow soldering if exposed to moisture. Standard component handling procedures apply.

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