TLVH431QLPR Equivalent & Substitute Parts

Part Overview

The TLVH431QLPR is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage regulation applications. This adjustable reference device operates across a 1.24V to 18V output range with ±1.5% tolerance and supports 70 mA output current. The device is packaged in TO-92-3 (through-hole) configuration and is currently in Last Time Buy status, indicating end-of-life production. Identifying qualified substitute parts is essential for design continuity and long-term supply chain planning.

Substiute Parts

TLVH431QLPR

Texas InstrumentsIn Stock: 3130TLVH431QLPR Datasheet

Current PartRFQ

TLVH431BQDBZR

Texas InstrumentsIn Stock: 20826TLVH431BQDBZR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TLVH431QLPR is determined by the following core electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Reference Type: Shunt (must match)
• Output Type: Adjustable (must match)
• Voltage - Output (Min/Fixed): 1.24V (must match)
• Voltage - Output (Max): 18V (must match)
• Current - Output: 70 mA (must match)
• Current - Cathode: 100 µA (must match)
• Operating Temperature: -40°C ~ 125°C (TA) (must match or exceed)

Mechanical Compatibility Criteria:

• Base Product Number: TLVH431 (same family)
• RoHS Status: ROHS3 Compliant (must match)

Tolerance Consideration: The TLVH431QLPR specifies ±1.5% tolerance. Substitute parts with equal or tighter tolerance (lower percentage) are functionally compatible, as they meet or exceed the original specification.

The TLVH431BQDBZR qualifies as a direct substitute based on matching all core electrical parameters and RoHS compliance. The primary difference is packaging format (SOT-23-3 surface mount versus TO-92-3 through-hole) and improved tolerance specification (±0.5% versus ±1.5%).

Parameter Comparison

Engineering Selection Recommendations

The TLVH431QLPR is designated Last Time Buy, indicating production discontinuation. The TLVH431BQDBZR is the qualified substitute from Texas Instruments, maintaining active product status and ensuring long-term availability.

Electrical Compatibility: All core electrical parameters match exactly. The TLVH431BQDBZR provides improved tolerance specification (±0.5% versus ±1.5%), which represents enhanced performance within the same functional class.

Compliance: Both parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for equivalent applications.

Packaging Transition: The primary design consideration is the package format change from TO-92-3 (through-hole) to SOT-23-3 (surface mount). This requires PCB layout modification and may necessitate assembly process changes. Designs utilizing through-hole mounting must evaluate the feasibility of transitioning to surface-mount technology.

Supply Chain: The TLVH431BQDBZR maintains significantly higher inventory availability (20,795 Pcs versus 3,040 Pcs), supporting sustained production requirements.

Frequently Asked Questions (FAQ)

Q: Can the TLVH431BQDBZR directly replace the TLVH431QLPR in existing designs?

A: Electrical substitution is valid. All core parameters—reference type, output voltage range, output current, cathode current, and operating temperature—are identical. However, the package format differs (SOT-23-3 surface mount versus TO-92-3 through-hole), requiring PCB redesign and assembly process modification.

Q: What does the tolerance improvement from ±1.5% to ±0.5% mean for circuit performance?

A: The TLVH431BQDBZR provides tighter output voltage accuracy. This represents enhanced performance and does not introduce compatibility issues. Circuits designed for ±1.5% tolerance will operate within specification with the ±0.5% substitute.

Q: Are there any thermal or current limitations when substituting?

A: No. Both devices support identical operating temperature ranges (-40°C ~ 125°C) and current specifications (70 mA output, 100 µA cathode current). Thermal and current handling characteristics are equivalent.

Q: Why is the TLVH431QLPR in Last Time Buy status?

A: Last Time Buy designation indicates Texas Instruments has discontinued production of this part number. The TLVH431BQDBZR represents the active product line continuation within the TLVH431 family.

Q: What is the primary design consideration when transitioning to the TLVH431BQDBZR?

A: The transition from through-hole (TO-92-3) to surface-mount (SOT-23-3) packaging requires PCB layout modification, footprint redesign, and potential assembly process changes. Electrical functionality remains unchanged.

Q: Are both parts RoHS compliant?

A: Yes. Both the TLVH431QLPR and TLVH431BQDBZR are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for equivalent applications.