TLV431BQLPR Equivalent & Substitute Parts

Part Overview

The TLV431BQLPR is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This through-hole TO-92-3 packaged component provides a fixed 1.24V output with ±0.5% tolerance and supports output currents up to 15 mA across an operating temperature range of -40°C to 125°C. The part is classified as Last Time Buy, indicating discontinued production status. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

Substiute Parts

TLV431BQLPR

Texas InstrumentsIn Stock: 2788TLV431BQLPR Datasheet

Current PartRFQ

TLV431AIDBZR

Texas InstrumentsIn Stock: 68481TLV431AIDBZR Datasheet

MFR RecommendedRFQ

TS431AIZ-AP

STMicroelectronicsIn Stock: 1122TS431AIZ-AP Datasheet

MFR RecommendedRFQ

TS431AIZT

STMicroelectronicsIn Stock: 55282TS431AIZT Datasheet

MFR RecommendedRFQ

TS431IZ-AP

STMicroelectronicsIn Stock: 907TS431IZ-AP Datasheet

MFR RecommendedRFQ

TS431IZT

STMicroelectronicsIn Stock: 5126TS431IZT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TLV431BQLPR is determined by the following critical parameters:

Core Functional Parameters:

• Reference Type: Shunt
• Output Type: Adjustable
• Voltage - Output (Min/Fixed): 1.24V
• Voltage - Output (Max): 6 V
• Operating Temperature Range: -40°C ~ 125°C

Performance Parameters:

• Current - Output: Minimum 15 mA required
• Tolerance: ±0.5% or better (lower tolerance values are acceptable)
• Current - Cathode: 100 µA or lower

Physical & Compliance Parameters:

• Mounting Type: Through Hole
• Package / Case: TO-92-3
• RoHS Status: ROHS3 Compliant

Substitute parts must maintain compatibility across all core functional parameters. Variations in tolerance (higher values acceptable), current ratings (higher values acceptable), and cathode current (lower values acceptable) are permissible within engineering design margins. All identified substitutes share the same base product functionality while differing in manufacturing source, packaging format, or performance grade.

Parameter Comparison

Engineering Selection Recommendations

Direct Through-Hole TO-92-3 Substitutes (Recommended for Pin-Compatible Replacement):

TS431AIZT and TS431AIZ-AP are the primary substitutes for through-hole applications. Both parts maintain the TO-92-3 package format, support the full -40°C to 125°C operating temperature range, and provide higher output current capability (30 mA versus 15 mA). These STMicroelectronics parts carry ±1% tolerance, which is acceptable for applications designed around the TLV431BQLPR's ±0.5% specification. Both parts are in Active product status with established supply availability.

TS431IZT and TS431IZ-AP offer identical package and temperature specifications but with ±2% tolerance. These parts are suitable for applications with relaxed tolerance requirements and maintain Active product status.

Surface Mount Alternative (Package Change Required):

TLV431AIDBZR is a Texas Instruments equivalent in SOT-23-3 surface mount packaging. This part maintains the same manufacturer source and provides ±1% tolerance with lower cathode current (80 µA). However, this substitute requires PCB redesign and assembly process changes due to the different package format. Operating temperature is limited to -40°C to 85°C, which may not be suitable for applications requiring the full 125°C upper limit. This option is appropriate only when PCB layout modifications are feasible.

Compliance & Availability:

All identified substitutes maintain ROHS3 compliance and REACH Unaffected status, matching the original part's regulatory requirements. STMicroelectronics TS431 series parts demonstrate higher inventory availability (1,024 to 55,200 units) compared to the original TLV431BQLPR (2,702 units in Last Time Buy status), providing improved supply chain security.

Frequently Asked Questions (FAQ)

Q: Can TS431AIZT replace TLV431BQLPR in existing designs without modification?

A: Yes, for through-hole applications. TS431AIZT maintains identical TO-92-3 package pinout, supports the same -40°C to 125°C temperature range, and provides the required 1.24V to 6V adjustable output. The ±1% tolerance is acceptable for designs specified around ±0.5%. No PCB modifications are required.

Q: What is the difference between TS431AIZ-AP and TS431AIZT?

A: Both parts are functionally identical STMicroelectronics TS431 shunt voltage references with ±1% tolerance and 30 mA output current. The primary difference is packaging format: TS431AIZ-AP is supplied in Tape & Box format, while TS431AIZT is supplied in Tape & Reel format. Selection depends on procurement volume and handling requirements.

Q: Why does TLV431AIDBZR have a lower operating temperature maximum?

A: TLV431AIDBZR is specified for -40°C to 85°C operation, compared to the original part's -40°C to 125°C range. This limitation is inherent to the SOT-23-3 surface mount package design. Applications requiring full 125°C operation must use through-hole TO-92-3 alternatives.

Q: Are the TS431 parts (STMicroelectronics) fully compatible with TLV431 designs (Texas Instruments)?

A: Yes, within the specified electrical parameters. Both manufacturers produce shunt voltage reference ICs with identical functional specifications: 1.24V adjustable output, 6V maximum, and through-hole TO-92-3 packaging. Cross-manufacturer substitution is standard practice in this component category.

Q: What is the significance of the ±2% tolerance variants (TS431IZ-AP, TS431IZT)?

A: These parts provide the same core functionality as ±1% variants but with relaxed tolerance specifications. They are suitable for applications where voltage reference accuracy is less critical or where design margins accommodate wider tolerance bands. Lower tolerance grades typically offer cost advantages and improved availability.

Q: Can I use TLV431AIDBZR if I redesign my PCB for surface mount?

A: Yes, if your application can operate within -40°C to 85°C. TLV431AIDBZR is a valid substitute for surface mount designs, maintaining Texas Instruments manufacturing source and ±1% tolerance. However, the reduced temperature range may be a limiting factor for industrial or automotive applications requiring 125°C operation.

Q: What is the cathode current specification, and why does it vary among substitutes?

A: Cathode current represents the minimum operating current required at the reference cathode terminal. The original TLV431BQLPR specifies 100 µA, while substitutes range from 60 µA to 80 µA. Lower cathode current values are advantageous for low-power applications and do not create compatibility issues when substituting into designs specified for higher values.