TZX6V2E-TAP Equivalent & Substitute Parts

Part Overview

The TZX6V2E-TAP is a 6.2 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in DO-35 (DO-204AH) axial through-hole package. This component is classified as an active product with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are necessary when the primary part is unavailable, when alternative packaging formats are required, or when specific compliance certifications differ from application requirements.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the TZX6V2E-TAP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nominal): 6.2 V (exact match required)
Power - Maximum: 500 mW (equal or greater)
Mounting Type: Through Hole (required)
Package / Case: DO-204AH, DO-35, Axial (required)

Secondary Compatibility Parameters:

Operating Temperature Range: -65°C to 175°C minimum
Voltage - Forward (Maximum) @ If: 1.5 V @ 200 mA or lower
Impedance (Maximum): 15 Ohms or lower

Substitute parts are grouped into two categories:

Category A - Full Electrical Equivalents (500 mW): Parts meeting all primary criteria with 500 mW power rating. These include 1N5234B, 1N5234C, 1N753A TR PBFREE, BZX79C6V2, and BZX79C6V2-T50R.

Category B - Reduced Power Equivalents (400 mW): Parts meeting primary criteria except power rating, which is 400 mW instead of 500 mW. These include 1N827A and 1N829A. These parts are suitable only for applications where the circuit design accommodates lower power dissipation.

Legacy Compatibility: The 1N821-1 maintains electrical compatibility with impedance matching the main part (15 Ohms) but operates within a narrower temperature range (-55°C to 175°C).

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (mW)	Tolerance	Zzt (Ohms)	Vf @ If (V)	Temp Range (°C)	RoHS Status
TZX6V2E-TAP	Vishay	6.2	500	-	15	1.5 @ 200 mA	-65 to 175	ROHS3
1N5234B	Microchip	6.2	500	±5%	7	1.5 @ 200 mA	-65 to 175	Non-compliant
1N5234C	Fairchild	6.2	500	±2%	7	1.1 @ 200 mA	-65 to 200	Not specified
1N753A TR PBFREE	Central Semiconductor	6.2	500	±5%	7	1.5 @ 200 mA	-65 to 200	ROHS3
1N821-1	Microchip	6.2	500	±5%	15	Not specified	-55 to 175	Non-compliant
1N827A	Solid State Inc.	6.2	400	±5%	15	Not specified	-55 to 175	ROHS3
1N829A	Solid State Inc.	6.2	400	±5%	15	Not specified	-55 to 175	ROHS3
BZX79C6V2	Taiwan Semiconductor	6.2	500	±5%	10	1.5 @ 100 mA	-65 to 175	ROHS3
BZX79C6V2-T50R	Fairchild	6.2	500	±5%	10	1.5 @ 100 mA	-65 to 200	Not specified

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement: The TZX6V2E-TAP is the primary choice due to explicit AEC-Q101 qualification. No substitute part in the provided list carries AEC-Q101 certification. Applications requiring automotive-grade qualification must retain the original part number.

For RoHS3 Compliance: Parts meeting ROHS3 compliance include TZX6V2E-TAP, 1N753A TR PBFREE, 1N827A, 1N829A, and BZX79C6V2. These are suitable for applications with RoHS3 requirements. The 1N5234B and 1N821-1 are RoHS non-compliant and unsuitable for RoHS-restricted applications.

For Full 500 mW Power Rating: The following parts maintain the 500 mW specification: 1N5234B, 1N5234C, 1N753A TR PBFREE, 1N821-1, BZX79C6V2, and BZX79C6V2-T50R. These are direct electrical substitutes for applications requiring full power dissipation capability.

For Reduced Power Applications (400 mW): The 1N827A and 1N829A provide 400 mW maximum power. These parts are suitable only when circuit design confirms that power dissipation does not exceed 400 mW under worst-case conditions.

For Extended Temperature Range: The 1N5234C and BZX79C6V2-T50R support operation to 200°C, exceeding the TZX6V2E-TAP specification of 175°C. These parts are suitable for high-temperature applications.

For Impedance Matching: The TZX6V2E-TAP and 1N821-1 both specify 15 Ohms maximum impedance. The 1N827A and 1N829A also match this impedance. All other substitutes specify 7 or 10 Ohms impedance, which represents improved performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can 1N5234B replace TZX6V2E-TAP in automotive applications?

A: The 1N5234B is electrically compatible with identical 6.2 V, 500 mW specifications and operating temperature range. However, it lacks AEC-Q101 qualification and is RoHS non-compliant. Substitution is not permitted in applications requiring automotive-grade certification.

Q: What is the difference between 1N827A and 1N829A?

A: Both parts are electrically identical with 6.2 V, 400 mW specifications. The primary difference is packaging: 1N827A is supplied without specified packaging format, while 1N829A is supplied in Box packaging. Both are ROHS3 compliant and suitable for applications tolerating 400 mW power dissipation.

Q: Why do some substitutes specify lower impedance values?

A: Impedance (Zzt) is a dynamic parameter affecting voltage regulation characteristics. Lower impedance values (7 or 10 Ohms versus 15 Ohms) indicate improved voltage stability and reduced dynamic resistance. Parts with lower impedance provide superior performance in voltage regulation applications but are electrically compatible with the original specification.

Q: Is BZX79C6V2-T50R suitable for applications requiring -65°C operation?

A: Yes. BZX79C6V2-T50R operates from -65°C to 200°C, meeting the lower temperature requirement of -65°C. This part is suitable for cryogenic and low-temperature applications.

Q: Can 1N753A TR PBFREE be used in place of TZX6V2E-TAP?

A: The 1N753A TR PBFREE is electrically compatible with 6.2 V, 500 mW specifications, ROHS3 compliance, and extended temperature range to 200°C. The primary difference is packaging format (Cut Tape versus Tape & Box). Substitution is permitted for non-automotive applications where AEC-Q101 certification is not required.

Q: What does the tolerance specification (±2%, ±5%) indicate?

A: Tolerance specifies the allowable deviation of the Zener voltage from the nominal 6.2 V value. The 1N5234C with ±2% tolerance provides tighter voltage regulation (6.08 V to 6.32 V) compared to ±5% parts (5.89 V to 6.51 V). Tighter tolerance is beneficial in precision voltage reference applications.

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

A: Yes. All substitute parts listed are supplied in DO-204AH (DO-35) axial through-hole package, maintaining mechanical and electrical compatibility with the original TZX6V2E-TAP.

Q: What is the significance of the forward voltage (Vf) specification?

A: Forward voltage indicates the voltage drop across the diode when conducting in the forward direction. The 1N5234C specifies 1.1 V @ 200 mA, lower than the 1.5 V specification of other parts. Lower forward voltage reduces power dissipation in forward-biased applications but does not affect Zener regulation performance.

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