TZX6V8C-TAP Zener Diode Equivalent & Substitute Parts

Part Overview

The TZX6V8C-TAP is a 6.8 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 identified based on matching electrical specifications, package compatibility, and operational parameters to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	6.8	V
Power - Maximum	500	mW
Impedance (Maximum)	15	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 3.5 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the TZX6V8C-TAP are qualified based on the following electrical and mechanical parameters:

Primary Matching Criteria:

Zener voltage: 6.8 V nominal
Maximum power dissipation: 500 mW
Package type: DO-35 (DO-204AH) or DO-7 (DO-204AA) axial through-hole
Operating temperature range: minimum -65°C to 175°C
Impedance (Zzt): 15 Ohms maximum

Substitution Logic: Parts are grouped into two categories based on package compatibility. Category 1 includes direct DO-35 package equivalents with identical electrical specifications. Category 2 includes DO-7 package variants that maintain electrical equivalence but differ in physical form factor. All substitute parts maintain the 6.8 V zener voltage and 500 mW power rating as mandatory requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Power Max	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	RoHS Status
TZX6V8C-TAP	Vishay General Semiconductor	6.8 V	500 mW	15 Ω	1.5 V @ 200 mA	-65 to 175°C	DO-35	ROHS3
BZX79C6V8	Taiwan Semiconductor Corporation	6.8 V	500 mW	15 Ω	1.5 V @ 100 mA	-65 to 175°C	DO-35	ROHS3
BZX79C6V8-T50A	Fairchild Semiconductor	6.8 V	500 mW	15 Ω	1.5 V @ 100 mA	-65 to 200°C	DO-35	Not specified
1N5235B	Microchip Technology	6.8 V	500 mW	5 Ω	1.5 V @ 200 mA	-65 to 175°C	DO-35	Non-compliant
1N5235B TR PBFREE	Central Semiconductor Corp	6.8 V	500 mW	5 Ω	1.1 V @ 200 mA	-65 to 200°C	DO-35	ROHS3
1N754A	Microchip Technology	6.8 V	500 mW	5 Ω	1.1 V @ 200 mA	-65 to 175°C	DO-7	Non-compliant
1N754A TR PBFREE	Central Semiconductor Corp	6.8 V	500 mW	5 Ω	1.5 V @ 200 mA	-65 to 200°C	DO-35	ROHS3

Engineering Selection Recommendations

Category 1: Direct DO-35 Package Equivalents (Recommended for Direct Replacement)

BZX79C6V8 and BZX79C6V8-T50A maintain identical zener voltage and power ratings with matching impedance specifications. Both are ROHS3 compliant or unaffected by RoHS requirements. BZX79C6V8-T50A extends the operating temperature range to 200°C, providing enhanced thermal performance for high-temperature applications.

1N5235B TR PBFREE and 1N754A TR PBFREE offer lower impedance (5 Ω) compared to the main part (15 Ω), resulting in improved voltage regulation characteristics. Both are ROHS3 compliant and support extended temperature operation to 200°C. 1N5235B TR PBFREE features reduced forward voltage (1.1 V @ 200 mA), improving efficiency in low-current applications.

Category 2: DO-7 Package Variant

1N754A is electrically equivalent but uses DO-7 (DO-204AA) package instead of DO-35. This part is suitable only when DO-7 package form factor is acceptable in the circuit layout. RoHS non-compliance status requires evaluation against application requirements.

Compliance Considerations:

For applications requiring ROHS3 compliance, select from: BZX79C6V8, BZX79C6V8-T50A, 1N5235B TR PBFREE, or 1N754A TR PBFREE. The main part TZX6V8C-TAP is ROHS3 compliant with AEC-Q101 automotive qualification; substitute parts without explicit automotive qualification should be evaluated for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can BZX79C6V8 directly replace TZX6V8C-TAP?

A: Yes. Both parts share identical zener voltage (6.8 V), power rating (500 mW), impedance (15 Ω), and operating temperature range (-65 to 175°C). Package compatibility is confirmed as both use DO-35 (DO-204AH) axial through-hole configuration. Electrical performance is equivalent for standard circuit applications.

Q: What is the difference between 1N5235B and 1N5235B TR PBFREE?

A: Both parts have identical electrical specifications (6.8 V, 500 mW, 5 Ω impedance). The primary difference is RoHS compliance status: 1N5235B is RoHS non-compliant, while 1N5235B TR PBFREE is ROHS3 compliant. Additionally, 1N5235B TR PBFREE supports extended temperature operation to 200°C compared to 175°C for the standard version.

Q: Can 1N754A be used as a substitute despite different package designation?

A: 1N754A uses DO-7 (DO-204AA) package instead of DO-35 (DO-204AH). While electrical specifications are equivalent, the physical form factor differs. Substitution is possible only if the circuit layout accommodates DO-7 package dimensions. For direct mechanical replacement, use DO-35 package variants.

Q: Why do some substitute parts have lower impedance (5 Ω vs. 15 Ω)?

A: Lower impedance (Zzt) indicates better voltage regulation performance and reduced dynamic resistance. Parts with 5 Ω impedance (1N5235B series, 1N754A series) provide superior regulation characteristics compared to the main part's 15 Ω specification. Selection depends on circuit requirements for voltage stability and load regulation.

Q: Are all substitute parts suitable for automotive applications?

A: The main part TZX6V8C-TAP carries AEC-Q101 automotive qualification. Substitute parts lack explicit automotive qualification statements in provided specifications. For automotive applications, confirm qualification status with the component manufacturer or evaluate against specific automotive standards required by the application.

Q: What is the significance of extended temperature range (-65 to 200°C)?

A: Extended temperature range to 200°C (versus 175°C) allows operation in higher ambient or junction temperature environments. Parts offering this extended range include BZX79C6V8-T50A, 1N5235B TR PBFREE, and 1N754A TR PBFREE. Selection depends on thermal requirements of the specific application circuit.

Q: Can packaging format (Tape & Box vs. Cut Tape vs. Bulk) affect electrical performance?

A: Packaging format affects supply and handling logistics but does not alter electrical performance. TZX6V8C-TAP (Tape & Box), BZX79C6V8 (Tape & Reel), 1N5235B TR PBFREE (Cut Tape), and BZX79C6V8-T50A (Bulk) are electrically equivalent. Selection is based on procurement requirements and assembly process compatibility.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message