TZX3V6C-TAP Equivalent & Substitute Parts

Part Overview

The TZX3V6C-TAP is a 3.6 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in the DO-35 (DO-204AH) through-hole package. This component is classified as an active product with AEC-Q101 automotive qualification and ROHS3 compliance. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications across automotive and industrial electronics. Equivalent and substitute parts are identified based on matching electrical characteristics and package compatibility to support design flexibility, supply chain alternatives, and inventory management.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.6	V
Power - Max	500	mW
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
Operating Temperature Range	-65°C ~ 175°C	°C
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	V @ mA
Current - Reverse Leakage @ Vr	5	µA @ 1 V
Impedance (Max)	100	Ohms

Substitute Part Grouping Explanation

Substitution of the TZX3V6C-TAP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 3.6 V nominal
Power dissipation: 500 mW maximum
Package type: DO-35 (DO-204AH) through-hole axial configuration
Operating temperature range: minimum -65°C to 175°C

Secondary Compatibility Factors:

Voltage tolerance (±5% or ±10%)
Impedance (Zzt) maximum value
Reverse leakage current
Forward voltage characteristics
RoHS and regulatory compliance status

All substitute parts listed maintain the core electrical specifications (3.6 V, 500 mW, DO-35 package, through-hole mounting) and operate within the required temperature range. Variations in impedance, tolerance, and forward voltage are within acceptable ranges for typical Zener diode applications. Compliance certifications differ between manufacturers; selection should account for specific application requirements regarding RoHS status and automotive qualification.

Parameter Comparison

Parameter	TZX3V6C-TAP (Vishay)	1N5227A (Microsemi)	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	3.6 V
Tolerance	-	±10%	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	100 Ohms	24 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	15 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	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 ~ 175°C	-65°C ~ 200°C	-65°C ~ 175°C	-65°C ~ 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35
RoHS Status	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Automotive Grade	AEC-Q101	Not specified	Not specified	Not specified	Not specified	Not specified

Engineering Selection Recommendations

For RoHS3 Compliant Applications: Select 1N5227BTR (onsemi), BZX79C3V6 (Taiwan Semiconductor Corporation), or maintain the original TZX3V6C-TAP (Vishay). All three parts meet ROHS3 compliance requirements. The 1N5227BTR offers extended operating temperature range to 200°C and lower forward voltage (1.2 V @ 200 mA), providing thermal margin in high-temperature environments.

For Automotive AEC-Q101 Qualified Applications: The TZX3V6C-TAP is the only part in this list with explicit AEC-Q101 qualification. If automotive qualification is mandatory, this part is the specified choice. Alternative parts do not carry documented automotive qualification in the provided specifications.

For General Industrial Applications Without RoHS Constraints: 1N5227A (Microsemi) and 1N5227B (Microchip) are functionally equivalent alternatives. The 1N5227B offers ±5% tolerance versus 1N5227A's ±10%, providing tighter voltage regulation. Both operate within the required temperature range and maintain 500 mW power rating.

For Impedance-Sensitive Applications: BZX79C3V6 (TSC) and BZX79C3V6-T50A (Fairchild) feature 90 Ohms maximum impedance, closer to the original TZX3V6C-TAP specification (100 Ohms). The 1N5227 series parts (Microsemi, Microchip, onsemi) feature lower impedance (24 Ohms), suitable for applications requiring lower dynamic resistance.

For Extended Temperature Range: 1N5227BTR (onsemi) and BZX79C3V6-T50A (Fairchild) support -65°C to 200°C operating range, extending the upper temperature limit by 25°C compared to the original part and most alternatives.

Frequently Asked Questions (FAQ)

Q: Can I substitute the TZX3V6C-TAP with any of the listed parts in my design?

A: Substitution is possible for applications where the core electrical specifications match: 3.6 V nominal Zener voltage, 500 mW power dissipation, and DO-35 through-hole package. However, if your design requires AEC-Q101 automotive qualification, only the TZX3V6C-TAP meets this requirement. For RoHS3 compliance, select from TZX3V6C-TAP, 1N5227BTR, or BZX79C3V6.

Q: What is the difference between the 1N5227 series parts from different manufacturers?

A: All 1N5227 variants (1N5227A, 1N5227B, 1N5227BTR) share the same 3.6 V, 500 mW specifications and DO-35 package. Key differences include: 1N5227A has ±10% tolerance and RoHS non-compliance; 1N5227B has ±5% tolerance and RoHS non-compliance; 1N5227BTR has ±5% tolerance, ROHS3 compliance, extended temperature range to 200°C, and lower forward voltage (1.2 V @ 200 mA). The 1N5227BTR from onsemi is the most feature-complete variant.

Q: How do impedance differences affect circuit performance?

A: Impedance (Zzt) affects the dynamic resistance of the Zener diode during transient voltage changes. The TZX3V6C-TAP and BZX79C series have higher impedance (90-100 Ohms) compared to the 1N5227 series (24 Ohms). Lower impedance provides faster voltage regulation response and lower output impedance in voltage reference circuits. Higher impedance is acceptable in applications with slower transient requirements or where the Zener is used primarily for overvoltage clamping.

Q: Are there temperature range considerations for substitution?

A: The original TZX3V6C-TAP operates from -65°C to 175°C. Most substitutes maintain this range. However, 1N5227BTR and BZX79C3V6-T50A extend to 200°C, providing additional thermal margin. If your application operates near 175°C, these extended-range parts offer design safety. Conversely, if your application operates only at lower temperatures, all listed parts are suitable.

Q: What packaging formats are available for these parts?

A: All listed parts use the DO-35 (DO-204AH) through-hole axial package. Packaging options differ by supplier: TZX3V6C-TAP is supplied in Tape & Box format; 1N5227A in Cut Tape; 1N5227B in Bulk; 1N5227BTR in Cut Tape; BZX79C3V6 in Tape & Reel; BZX79C3V6-T50A in Bulk. Package format affects handling and assembly but does not change electrical performance.

Q: Which part should I select for new designs?

A: For new designs without automotive qualification requirements, 1N5227BTR (onsemi) is recommended due to ROHS3 compliance, ±5% tolerance, extended temperature range to 200°C, and lower forward voltage. For automotive applications, the TZX3V6C-TAP with AEC-Q101 qualification is the appropriate choice. For cost-sensitive applications without compliance constraints, BZX79C3V6-T50A (Fairchild) offers equivalent performance at potentially lower cost.

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