TL431ACP Equivalent & Substitute Parts

Part Overview

The TL431ACP is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This 8-DIP through-hole component provides an adjustable output range from 2.495V to 36V with ±1% tolerance and 100 mA output capability. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Substiute Parts

TL431ACP

Texas InstrumentsIn Stock: 4652TL431ACP Datasheet

Current PartRFQ

TL431ACDBZR

Texas InstrumentsIn Stock: 77248TL431ACDBZR Datasheet

MFR RecommendedRFQ

LT1431CN8#PBF

Analog Devices Inc.In Stock: 1402LT1431CN8#PBF Datasheet

MFR RecommendedRFQ

LT1431IN8#PBF

Linear TechnologyIn Stock: 1265LT1431IN8#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TL431ACP is determined by the following critical parameters:

• Reference Type: Shunt voltage reference
• Output Type: Adjustable
• Voltage Range: 2.495V to 36V minimum output capability
• Current Output: 100 mA minimum
• Tolerance: ±1% or better
• Current - Cathode: 600 µA or compatible
• Operating Temperature: 0°C ~ 70°C minimum range
• RoHS Compliance: ROHS3 Compliant

Substitute parts must maintain electrical equivalence across these parameters. Package type (through-hole vs. surface mount) and product status (active vs. obsolete) are secondary considerations that affect design implementation but do not prevent functional substitution when electrical specifications align.

Parameter Comparison

Engineering Selection Recommendations

TL431ACDBZR is the manufacturer-recommended substitute from Texas Instruments. It maintains identical electrical specifications (2.495V minimum output, 36V maximum, 100 mA, ±1% tolerance) and RoHS3 compliance. The primary difference is packaging: SOT-23-3 surface mount versus 8-DIP through-hole. This substitute is active in production and suitable for new designs requiring surface-mount implementation.

LT1431CN8#PBF from Analog Devices Inc. provides improved tolerance (±0.4% vs. ±1%) and maintains through-hole 8-DIP packaging identical to the original. It is active in production and ROHS3 compliant. The higher cathode current (1 mA vs. 600 µA) is compatible with standard circuit designs. This substitute is appropriate for applications where improved accuracy is beneficial and through-hole mounting is required.

LT1431IN8#PBF from Linear Technology maintains through-hole 8-DIP packaging and offers extended operating temperature range (-40°C ~ 85°C). However, this part is obsolete and RoHS non-compliant, making it unsuitable for new designs or applications requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can TL431ACDBZR replace TL431ACP in existing through-hole designs?

A: TL431ACDBZR is electrically equivalent but uses SOT-23-3 surface-mount packaging instead of 8-DIP through-hole. Direct PCB substitution is not possible without redesign. For through-hole applications, LT1431CN8#PBF is the appropriate substitute.

Q: What is the difference between ±1% and ±0.4% tolerance?

A: Tolerance specifies the maximum deviation of the output voltage from the nominal value. ±0.4% tolerance (LT1431CN8#PBF) provides tighter voltage regulation than ±1% tolerance (TL431ACP). Both are functionally compatible; the choice depends on application accuracy requirements.

Q: Are all substitutes RoHS compliant?

A: TL431ACDBZR and LT1431CN8#PBF are ROHS3 compliant. LT1431IN8#PBF is RoHS non-compliant and should not be used in applications requiring regulatory compliance.

Q: What does cathode current specification mean?

A: Cathode current is the minimum operating current required at the reference cathode. LT1431 variants require 1 mA minimum, while TL431 variants require 600 µA minimum. Both are compatible with standard circuit designs that typically source 1-2 mA through the reference.

Q: Which substitute should I use for new designs?

A: For surface-mount applications, use TL431ACDBZR (active, ROHS3 compliant). For through-hole applications, use LT1431CN8#PBF (active, ROHS3 compliant, improved tolerance).