TZX6V2A-TAP Equivalent & Substitute Parts

Part Overview

The TZX6V2A-TAP is a 6.2 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in the DO-35 (DO-204AH) axial through-hole package. This component is classified as an automotive-grade device with AEC-Q101 qualification and operates across a temperature range of -65°C to 175°C. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging or compliance requirements are needed, or when design flexibility permits selection from multiple qualified sources. The substitute parts listed maintain the core electrical specifications while offering variations in tolerance, impedance characteristics, and compliance certifications.

Key Parameters

Parameter	TZX6V2A-TAP	Unit
Voltage - Zener (Nominal)	6.2	V
Power - Maximum	500	mW
Impedance (Maximum)	15	Ohms
Current - Reverse Leakage @ Vr	1 µA @ 3 V	µA
Voltage - Forward (Maximum) @ If	1.5 V @ 200 mA	V
Operating Temperature Range	-65 to 175	°C
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TZX6V2A-TAP is determined by the following critical parameters:

Primary Electrical Specifications:

Zener voltage: 6.2 V (nominal)
Maximum power dissipation: 500 mW or higher
Package type: DO-35 (DO-204AH) axial through-hole configuration
Operating temperature range: minimum -65°C to 175°C

Secondary Electrical Characteristics:

Impedance (Zzt): Values between 3 and 15 Ohms are acceptable
Reverse leakage current: Specifications vary by part
Forward voltage: Specifications vary by part
Tolerance: ±2%, ±5%, or unspecified

Compliance and Certification:

RoHS status: ROHS3 compliant preferred but non-compliant alternatives available
Automotive qualification: AEC-Q101 preferred but not required for all substitutes
REACH status: All substitutes are REACH Unaffected

The substitute parts are grouped into two categories: full 500 mW equivalents (1N5234B, 1N5234B TR PBFREE, 1N5234BTR, 1N5234C, BZX79C6V2) and reduced-power 400 mW alternatives (1N825A, 1N827A, 1N829A). The 500 mW group maintains identical power ratings; the 400 mW group is suitable only for applications where maximum power dissipation does not exceed 400 mW.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (mW)	Tolerance	Zzt (Ohms)	Temp Range (°C)	RoHS Status	Package
TZX6V2A-TAP	Vishay	6.2	500	—	15	-65 to 175	ROHS3	DO-35
1N5234B	Microchip	6.2	500	±5%	7	-65 to 175	Non-compliant	DO-35
1N5234B TR PBFREE	Central Semiconductor	6.2	500	±5%	7	-65 to 200	ROHS3	DO-35
1N5234BTR	Fairchild	6.2	500	±5%	7	-65 to 200	—	DO-35
1N5234C	Fairchild	6.2	500	±2%	7	—	—	DO-35
1N753A-1	Microchip	6.2	500	±5%	3	-65 to 175	Non-compliant	DO-35
1N825	Microchip	6.2	500	±5%	15	-65 to 175	Non-compliant	DO-35
1N825A	Solid State Inc.	6.2	400	±5%	15	-55 to 175	ROHS3	DO-35
1N827A	Solid State Inc.	6.2	400	±5%	15	-55 to 175	ROHS3	DO-35
1N829A	Solid State Inc.	6.2	400	±5%	15	-55 to 175	ROHS3	DO-35
BZX79C6V2	Taiwan Semiconductor	6.2	500	±5%	10	-65 to 175	ROHS3	DO-35

Engineering Selection Recommendations

Full 500 mW Equivalents (Preferred for Direct Substitution):

The following parts maintain the 500 mW power rating and are suitable for direct substitution in applications requiring the full power specification of the TZX6V2A-TAP:

1N5234B TR PBFREE (Central Semiconductor): ROHS3 compliant with extended temperature range (-65°C to 200°C). Lower impedance (7 Ohms) provides improved regulation characteristics.
1N5234BTR (Fairchild): Extended temperature range (-65°C to 200°C) with 500 mW rating and ±5% tolerance.
1N5234C (Fairchild): Tighter tolerance specification (±2%) with 500 mW rating, suitable for applications requiring improved voltage accuracy.
BZX79C6V2 (Taiwan Semiconductor): ROHS3 compliant with 500 mW rating and -65°C to 175°C operating range matching the primary part.
1N753A-1 (Microchip): Lowest impedance (3 Ohms) among 500 mW options, providing superior regulation performance.
1N825 (Microchip): Impedance matching the primary part (15 Ohms) with 500 mW rating and identical temperature range.

Reduced Power 400 mW Alternatives (Conditional Substitution):

The following parts operate at 400 mW maximum power and are suitable only for applications where power dissipation does not exceed 400 mW:

1N825A, 1N827A, 1N829A (Solid State Inc.): All three parts are ROHS3 compliant with identical electrical specifications (6.2 V, 400 mW, ±5% tolerance, 15 Ohms impedance). Operating temperature range is -55°C to 175°C, which is narrower than the primary part at the lower end.

Compliance Considerations:

For applications requiring ROHS3 compliance, select from: 1N5234B TR PBFREE, 1N825A, 1N827A, 1N829A, or BZX79C6V2. For automotive-grade applications with AEC-Q101 qualification, the primary part TZX6V2A-TAP remains the specified choice; no substitute carries automotive qualification in the provided data.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 mW substitute in place of the TZX6V2A-TAP?

A: Only if your application's maximum power dissipation does not exceed 400 mW. The 1N825A, 1N827A, and 1N829A are rated for 400 mW maximum. Exceeding this rating will cause device failure. Verify your circuit's power requirements before selecting a reduced-power alternative.

Q: What is the difference between impedance values in the substitute parts?

A: Impedance (Zzt) affects the dynamic regulation of the Zener diode. Lower impedance values (3 to 7 Ohms) provide better voltage regulation under changing load conditions. Higher impedance values (15 Ohms) are less stable but may be acceptable in applications with stable load conditions. The primary part specifies 15 Ohms; substitutes with lower impedance will improve regulation performance.

Q: Are all substitute parts available in the same DO-35 package?

A: Yes. All substitute parts listed are packaged in DO-35 (DO-204AH) axial through-hole configuration, identical to the primary part. Mechanical compatibility is maintained across all options.

Q: What is the significance of tolerance specifications (±2%, ±5%)?

A: Tolerance indicates the allowable deviation from the nominal 6.2 V Zener voltage. The 1N5234C offers ±2% tolerance (tighter specification), while most other substitutes offer ±5% tolerance (wider specification). For applications requiring precise voltage regulation, the ±2% option provides better accuracy.

Q: Can I use a substitute with an extended temperature range?

A: Yes. The 1N5234B TR PBFREE and 1N5234BTR both operate to 200°C maximum, exceeding the primary part's 175°C limit. These are suitable for applications requiring higher temperature operation. However, verify that your circuit design supports the extended temperature range.

Q: Why do some substitutes show "RoHS non-compliant" status?

A: RoHS non-compliant parts may contain restricted substances such as lead. For applications subject to RoHS regulations or environmental requirements, select only ROHS3 compliant alternatives: 1N5234B TR PBFREE, 1N825A, 1N827A, 1N829A, or BZX79C6V2.

Q: Is the TZX6V2A-TAP automotive-qualified?

A: Yes. The primary part carries AEC-Q101 qualification and automotive grade designation. None of the substitute parts in the provided data carry automotive qualification. For automotive applications requiring AEC-Q101 compliance, the primary part is the specified choice.

Q: What packaging options are available for substitutes?

A: The primary part is supplied in Tape & Box (TB) packaging. Substitutes are available in Bulk, Cut Tape (CT), Tape & Reel (TR), and Box packaging. Verify packaging compatibility with your procurement and assembly processes before selection.

Q: Can I substitute based on impedance alone?

A: No. Impedance is one of several parameters that must be evaluated together. All substitutes must maintain the 6.2 V nominal Zener voltage, support at least 400 mW power dissipation (500 mW preferred), and operate within your required temperature range. Impedance selection should be based on your circuit's regulation requirements.

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