TZX3V6A-TAP Equivalent & Substitute Parts

Part Overview

The TZX3V6A-TAP is a 3.6 V Zener diode rated at 500 mW in a DO-35 through-hole package, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as an active product with automotive-grade qualification (AEC-Q101) and ROHS3 compliance. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage circuits. Equivalent and substitute parts are identified when original inventory is unavailable, when alternative packaging formats are required, or when sourcing from multiple manufacturers is necessary for supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.6	V
Power - Max	500	mW
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Operating Temperature Range	-65°C ~ 175°C	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the TZX3V6A-TAP is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Voltage - Zener (Nom): 3.6 V (exact match required)
Power - Max: 500 mW (exact match required)
Package / Case: DO-204AH, DO-35, Axial (mechanical compatibility required)
Mounting Type: Through Hole (assembly compatibility required)

Allowable Variations:

Tolerance: ±5% is acceptable (original part specifies no tolerance; substitutes with ±5% tolerance remain functionally equivalent)
Impedance (Max): Variations between 24 Ohms and 100 Ohms are acceptable within the specified electrical performance envelope
Current - Reverse Leakage @ Vr: Variations between 5 µA and 15 µA @ 1 V are acceptable
Voltage - Forward (Vf) (Max) @ If: Variations between 1.2 V and 1.5 V at specified current levels are acceptable
Operating Temperature Range: Extensions beyond -65°C ~ 175°C (up to 200°C) are acceptable

All substitute parts listed maintain the same nominal Zener voltage and power rating, ensuring direct functional equivalence in voltage regulation and protection applications.

Parameter Comparison

Parameter	TZX3V6A-TAP (Vishay)	1N5227B (Microchip)	1N5227BTR (onsemi)	BZX79C3V6 (TSC)	BZX79C3V6-T50A (Fairchild)
Voltage - Zener (Nom)	3.6 V	3.6 V	3.6 V	3.6 V	3.6 V
Tolerance	—	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	100 Ohms	24 Ohms	24 Ohms	90 Ohms	90 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 1 V	15 µA @ 1 V	15 µA @ 1 V	15 µA @ 1 V	15 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.2 V @ 200 mA	1.5 V @ 100 mA	1.5 V @ 100 mA
Operating Temperature	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 200°C	-65°C ~ 175°C	-65°C ~ 200°C
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

Primary Substitute (Recommended for Automotive Applications): The 1N5227BTR (onsemi) is the preferred substitute when the TZX3V6A-TAP is unavailable. This part maintains ROHS3 compliance, extends the operating temperature range to 200°C, and provides superior forward voltage characteristics (1.2 V @ 200 mA). The part is actively produced and available in Cut Tape packaging.

Secondary Substitutes (Functionally Equivalent):

BZX79C3V6-T50A (Fairchild): Offers the highest inventory availability (22,113 pcs) and extended temperature range (-65°C ~ 200°C). Suitable for applications where packaging format (Bulk) is acceptable.
BZX79C3V6 (Taiwan Semiconductor Corporation): Maintains ROHS3 compliance and automotive-grade performance with impedance characteristics (90 Ohms) closer to the original part.

Non-Recommended Substitute: The 1N5227B (Microchip) is not RoHS compliant and does not meet the automotive-grade requirements of the original specification. This part is suitable only for non-automotive applications where RoHS compliance is not mandated.

Compliance Considerations: All recommended substitutes maintain the AEC-Q101 automotive qualification standard or equivalent performance metrics. The 1N5227BTR and BZX79C3V6 are ROHS3 compliant, matching the original part's environmental compliance status.

Frequently Asked Questions (FAQ)

Q: Can the 1N5227B be used as a direct replacement for the TZX3V6A-TAP? A: The 1N5227B is electrically equivalent in terms of Zener voltage (3.6 V) and power rating (500 mW). However, it is not RoHS compliant, which disqualifies it for applications requiring automotive-grade or RoHS3-compliant components. Use only in non-regulated applications where RoHS compliance is not required.

Q: What is the difference between the packaging formats (Tape & Box, Bulk, Cut Tape, Tape & Reel)? A: Packaging format affects supply chain logistics and assembly processes but does not alter electrical performance. Tape & Box (TB) and Tape & Reel (TR) are suitable for automated assembly. Bulk packaging is used for manual assembly or kit distribution. Cut Tape (CT) is a compromise format for moderate-volume applications. All formats contain the same component in the DO-35 package.

Q: Are there temperature range differences between substitutes? A: Yes. The TZX3V6A-TAP operates from -65°C to 175°C. The 1N5227BTR and BZX79C3V6-T50A extend the upper limit to 200°C, providing additional thermal margin in high-temperature environments. The BZX79C3V6 maintains the original -65°C to 175°C range.

Q: What does impedance variation mean for circuit performance? A: Impedance (Zzt) affects the dynamic response of the Zener diode under transient conditions. The TZX3V6A-TAP specifies 100 Ohms maximum impedance. Substitutes with lower impedance (24 Ohms for 1N5227 series) provide faster transient response and lower noise. Substitutes with similar impedance (90 Ohms for BZX79 series) maintain comparable performance characteristics.

Q: Is the ±5% tolerance on substitute parts acceptable? A: Yes. The original TZX3V6A-TAP does not specify a tolerance value, indicating a standard manufacturing tolerance. Substitute parts with ±5% tolerance are within acceptable limits for voltage regulation and protection applications. The nominal 3.6 V specification is maintained across all parts.

Q: Can I use these substitutes in automotive applications? A: The 1N5227BTR and BZX79C3V6 are suitable for automotive applications. Both maintain ROHS3 compliance and automotive-grade performance standards. The 1N5227B and BZX79C3V6-T50A should be evaluated against specific automotive qualification requirements before use.

Q: What is the significance of reverse leakage current variation? A: Reverse leakage current (5 µA to 15 µA @ 1 V) affects standby power consumption and circuit stability. Lower leakage (5 µA in the original part) is preferable for low-power applications. Higher leakage (15 µA in substitutes) remains acceptable for most voltage regulation and protection circuits but may impact battery-powered applications requiring extended standby periods.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message