TL431BIDE4 Equivalent & Substitute Parts

Part Overview

The TL431BIDE4 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable output voltage regulation in power management applications. This component operates as a precision voltage reference with an adjustable output range from 2.495V to 36V and a tolerance of ±0.5%. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain compatibility across electrical specifications, mechanical packaging, and thermal operating ranges to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	TL431BIDE4 Specification
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.5%
Current - Cathode	700 µA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TL431BIDE4 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Reference Type: Shunt (all substitutes must be shunt-type references)
Output Type: Adjustable (output voltage must be user-adjustable)
Voltage Range: Output minimum ≥ 2.495V and maximum ≥ 36V
Current - Output: 100 mA (minimum requirement)
Operating Temperature: Must support -40°C ~ 85°C range
Package: 8-SOIC form factor (0.154", 3.90mm Width)

Tolerance Consideration: The TL431BIDE4 specifies ±0.5% tolerance. Substitute parts with equal or tighter tolerance (lower percentage values) are directly compatible. Parts with looser tolerance may be acceptable depending on circuit design margin requirements but represent a functional trade-off.

Cathode Current: The TL431BIDE4 specifies 700 µA cathode current. Substitute parts with lower cathode current (1 mA or less) are compatible and represent improved performance characteristics.

Compliance & Status: Product status (Active vs. Obsolete) and RoHS compliance are secondary selection criteria that do not affect electrical substitution but influence long-term availability and regulatory requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage Min (V)	Voltage Max (V)	Tolerance	Current Output (mA)	Cathode Current	Temp Range (°C)	Product Status	RoHS Status
TL431BIDE4	Texas Instruments	2.495	36	±0.5%	100	700 µA	-40 ~ 85	Obsolete	ROHS3 Compliant
LM431CIM/NOPB	Texas Instruments	2.5	37	-0.6%, +0.4%	100	1 mA	-40 ~ 85	Active	ROHS3 Compliant
TL431BID	onsemi	2.495	36	±0.4%	100	1 mA	-40 ~ 85	Obsolete	RoHS non-compliant
LM431AIM/NOPB	Texas Instruments	2.495	37	±2.2%	100	1 mA	-40 ~ 85	Active	ROHS3 Compliant
LM431AIMX/NOPB	Texas Instruments	2.495	37	±2.2%	100	1 mA	-40 ~ 85	Active	ROHS3 Compliant
LM431BIM/NOPB	Texas Instruments	2.495	37	±1%	100	1 mA	-40 ~ 85	Active	ROHS3 Compliant
KA431DTF	onsemi	2.5	36	±2%	100	1 mA	-25 ~ 85	Active	ROHS3 Compliant
LM431AIMX	National Semiconductor	2.5	36	±2%	100	1 mA	-40 ~ 85	Active	RoHS non-compliant
LM431BCMX	National Semiconductor	2.495	36	±1%	100	1 mA	-25 ~ 85	Active	Vendor Undefined
LM431CIMX	onsemi	2.495	36	±0.5%	100	1 mA	-40 ~ 85	Active	ROHS3 Compliant
NCV431AIDR2G	onsemi	2.495	36	±1%	100	1 mA	-40 ~ 125	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Electrical Equivalents (Recommended for Immediate Replacement):

LM431CIMX and LM431CIM/NOPB are the closest electrical equivalents to TL431BIDE4. Both maintain the ±0.5% tolerance specification, identical voltage output range (2.495V minimum, 36V maximum), and full -40°C to 85°C operating temperature compatibility. LM431CIMX is manufactured by onsemi and carries ROHS3 compliance with active product status, ensuring long-term availability. LM431CIM/NOPB is a Texas Instruments product with identical electrical performance and active status.

Tier 2 - Tighter Tolerance Alternatives (Enhanced Precision):

TL431BID (onsemi) offers ±0.4% tolerance, which is tighter than the original ±0.5% specification. This part maintains voltage range compatibility and full temperature range support. However, it carries obsolete product status and RoHS non-compliance, limiting its suitability for new designs requiring regulatory compliance.

Tier 3 - Acceptable Tolerance Trade-offs (Cost-Optimized):

LM431BIM/NOPB and LM431BCMX provide ±1% tolerance with active product status and ROHS3 compliance. These parts are suitable for applications where the relaxed tolerance does not compromise circuit performance. LM431BIM/NOPB is Texas Instruments sourced with full temperature range support. LM431BCMX (National Semiconductor) operates at -25°C minimum, which may be limiting for extended low-temperature applications.

Tier 4 - Specialized Applications:

NCV431AIDR2G is an automotive-grade part (AEC-Q100 qualified) with extended temperature range (-40°C to 125°C) and ±1% tolerance. This part is suitable for automotive and high-temperature industrial applications. KA431DTF (onsemi) offers ±2% tolerance with active status but operates at -25°C minimum temperature, making it unsuitable for full -40°C applications.

Compliance Considerations:

For new designs requiring ROHS3 compliance, select from: LM431CIM/NOPB, LM431AIM/NOPB, LM431AIMX/NOPB, LM431BIM/NOPB, KA431DTF, LM431CIMX, or NCV431AIDR2G. Parts with RoHS non-compliance (TL431BID, LM431AIMX) should be avoided in regulated markets unless legacy support is explicitly required.

Frequently Asked Questions (FAQ)

Q: Can LM431CIMX directly replace TL431BIDE4 without circuit modification?

A: Yes. LM431CIMX maintains identical electrical specifications including ±0.5% tolerance, 2.495V minimum output voltage, 36V maximum output voltage, 100 mA output current, and -40°C to 85°C operating temperature range. The 8-SOIC package is mechanically identical. No circuit redesign is required.

Q: What is the difference between LM431CIM/NOPB and LM431CIMX?

A: Both parts are electrically identical with ±0.5% tolerance and identical voltage/current specifications. The primary difference is packaging: LM431CIM/NOPB is supplied in Tube packaging, while LM431CIMX is supplied in bulk. Select based on procurement and assembly requirements.

Q: Why do some substitute parts have ±2.2% or ±2% tolerance instead of ±0.5%?

A: Tolerance specifications reflect manufacturing grade and cost optimization. Parts with looser tolerance (higher percentage values) are acceptable substitutes only if circuit design margins accommodate the wider voltage variation. Review voltage regulation requirements before selecting parts with tolerance greater than ±1%.

Q: Is NCV431AIDR2G suitable for non-automotive applications?

A: Yes. NCV431AIDR2G is automotive-qualified but not restricted to automotive use. Its extended temperature range (-40°C to 125°C) and ±1% tolerance make it suitable for industrial and high-reliability applications. The AEC-Q100 qualification indicates superior quality assurance.

Q: What is the significance of cathode current differences (700 µA vs. 1 mA)?

A: Cathode current represents the minimum operating current required for the reference to function. The TL431BIDE4 specifies 700 µA, while most substitutes specify 1 mA. Lower cathode current (700 µA) is more efficient but not a limiting factor for substitution. Parts with 1 mA cathode current are fully compatible and represent standard performance.

Q: Can I use LM431AIMX or LM431AIM/NOPB as substitutes despite ±2.2% tolerance?

A: These parts are electrically compatible but represent a significant tolerance trade-off. Use only if circuit design includes sufficient voltage regulation margin to accommodate ±2.2% variation. For precision voltage reference applications, Tier 1 or Tier 2 alternatives are recommended.

Q: Why is TL431BID listed as obsolete despite being a substitute option?

A: TL431BID is obsolete but remains available in inventory. It offers tighter ±0.4% tolerance than the original TL431BIDE4. Use only for legacy system support or when existing inventory is available. For new designs, select active-status alternatives to ensure long-term supply continuity.

Q: Are there temperature range limitations I should consider?

A: The TL431BIDE4 operates -40°C to 85°C. Most substitutes maintain this range. KA431DTF and LM431BCMX operate only to -25°C minimum, making them unsuitable for applications requiring full -40°C operation. NCV431AIDR2G extends to 125°C maximum, suitable for high-temperature environments.

Q: What packaging options are available for these substitutes?

A: All listed substitutes use 8-SOIC (0.154", 3.90mm Width) surface-mount packaging, identical to TL431BIDE4. Packaging variants (Tube, Tape & Reel, Bulk, Cut Tape) affect procurement and assembly processes but do not impact electrical compatibility or PCB layout.

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