TL431ACDBVTG4 Equivalent & Substitute Parts

Part Overview

The TL431ACDBVTG4 is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage regulation and reference applications. This adjustable reference provides output voltage from 2.495V to 36V with ±1% tolerance and supports output current up to 100 mA in a compact SOT-23-5 surface mount package. The part is currently listed as obsolete, making equivalent and substitute parts essential for ongoing design support and production continuity.

Substiute Parts

TL431ACDBVTG4

Texas InstrumentsIn Stock: 1117TL431ACDBVTG4 Datasheet

Current PartRFQ

TL431AW5-7

Diodes IncorporatedIn Stock: 27273TL431AW5-7 Datasheet

DirectRFQ

TL431AIL5T

STMicroelectronicsIn Stock: 4462TL431AIL5T Datasheet

UpgradeRFQ

AS431BKTR-G1

Diodes IncorporatedIn Stock: 4229AS431BKTR-G1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TL431ACDBVTG4 is determined by the following critical parameters:

• Reference Type: Shunt (all substitutes must be shunt-type references)
• Output Type: Adjustable (voltage output must be user-adjustable)
• Voltage Range: 2.495V minimum to 36V maximum output capability
• Current Rating: 100 mA output current minimum
• Tolerance: ±1% accuracy
• Package Compatibility: SOT-23-5 or equivalent pinout (SC-74A, SOT-753)
• Mounting: Surface mount technology
• Compliance: ROHS3 compliant

The three substitute parts listed below meet these core electrical and mechanical requirements, though variations exist in operating temperature range, cathode current specifications, and product status.

Parameter Comparison

Engineering Selection Recommendations

TL431AW5-7 (Diodes Incorporated) is a direct functional equivalent with active product status. This part maintains identical electrical specifications (2.495V to 36V, 100 mA, ±1% tolerance) and is available in high volume (27,200 pcs in stock). The extended operating temperature range (-40°C to 125°C) provides broader environmental coverage than the original part. Cathode current is slightly elevated at 700 µA versus 600 µA. The SOT-25 package designation differs from SOT-23-5, requiring PCB layout verification for pin compatibility despite identical SC-74A case dimensions.

TL431AIL5T (STMicroelectronics) is an upgrade-class substitute with active product status and identical SOT-23-5 package specification. Electrical performance matches the main part across all critical parameters (2.495V to 36V, 100 mA, ±1% tolerance). Operating temperature range extends to -40°C to 105°C. Cathode current is 700 µA. This part offers direct package compatibility and is suitable for designs requiring extended temperature performance.

AS431BKTR-G1 (Diodes Incorporated) is a manufacturer-recommended substitute with active product status. This part maintains the core shunt reference architecture with identical output current (100 mA) and voltage range (36V maximum). The minimum output voltage is specified at 2.5V versus 2.495V, representing a 0.2% variation within the ±1% tolerance band. Cathode current is elevated to 1 mA. Temperature coefficient is specified at 20 ppm/°C typical. Operating temperature range is -40°C to 125°C. Moisture sensitivity level is MSL-3 (168 hours) versus MSL-1 (unlimited) for the main part.

All three substitutes are ROHS3 compliant and carry EAR99 export classification. Selection should be based on specific application requirements for operating temperature range, cathode current budget, and moisture sensitivity constraints.

Frequently Asked Questions (FAQ)

Q: Can TL431AW5-7 be used as a direct replacement for TL431ACDBVTG4?

A: TL431AW5-7 meets all core electrical requirements (shunt reference, adjustable output, 2.495V to 36V, 100 mA, ±1% tolerance, SOT-23-5 package). The primary consideration is package designation (SOT-25 versus SOT-23-5); verify PCB footprint compatibility despite identical case dimensions. Cathode current is 700 µA versus 600 µA, which may affect bias resistor calculations in the reference circuit.

Q: What is the difference between TL431AIL5T and TL431AW5-7?

A: Both parts are functionally equivalent with identical electrical specifications. TL431AIL5T uses SOT-23-5 package designation (exact match to original), while TL431AW5-7 uses SOT-25. TL431AIL5T is manufactured by STMicroelectronics; TL431AW5-7 is from Diodes Incorporated. Operating temperature ranges differ slightly (-40°C to 105°C versus -40°C to 125°C).

Q: Why is AS431BKTR-G1 listed as a manufacturer-recommended substitute if the minimum voltage is 2.5V instead of 2.495V?

A: The 0.005V difference (2.5V versus 2.495V) represents a 0.2% variation, which falls within the ±1% tolerance specification of both parts. This variation is acceptable for most applications. However, designs with tight voltage regulation requirements should account for this offset in feedback network calculations.

Q: What is the impact of cathode current differences between these parts?

A: Cathode current affects the bias resistor network in shunt reference circuits. The main part specifies 600 µA; substitutes range from 700 µA to 1 mA. Higher cathode current requires lower bias resistor values to maintain regulation. Circuit redesign may be necessary for applications with strict power budget constraints.

Q: Are all substitutes suitable for extended temperature applications?

A: The original TL431ACDBVTG4 operates from 0°C to 70°C. All three substitutes extend the lower temperature limit to -40°C. TL431AW5-7 and AS431BKTR-G1 reach 125°C maximum; TL431AIL5T reaches 105°C. Select based on specific application temperature requirements.

Q: What is the significance of MSL-3 moisture sensitivity for AS431BKTR-G1?

A: AS431BKTR-G1 carries MSL-3 (168-hour floor life) versus MSL-1 (unlimited) for other parts. This requires stricter moisture control during storage and handling. Bake-out procedures may be necessary if the part exceeds floor life limits before assembly.