1N5235C-TAP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5235C-TAP is a 6.8 V zener diode rated at 500 mW with ±2% tolerance, manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component in DO-35 (DO-204AH) package is designed for voltage regulation and protection applications. The part is currently active and ROHS3 compliant with AEC-Q101 automotive qualification.

Substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative packaging formats are required for assembly processes, or when design specifications allow for relaxed tolerance or power rating parameters while maintaining core electrical functionality.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	6.8	V
Tolerance	±2%	-
Power - Maximum	500	mW
Impedance (Maximum)	5	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 5 V
Voltage - Forward (Maximum) @ If	1.1	V @ 200 mA
Operating Temperature	175	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH (DO-35)	-
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitution of the 1N5235C-TAP is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 6.8 V (nominal)
Power rating: 500 mW or higher
Tolerance: ±2% or ±5% (relaxed tolerance acceptable in non-critical applications)
Mounting type: Through hole
Package format: DO-35 (DO-204AH) or DO-7 (DO-204AA)

Secondary Considerations:

Impedance (Zzt): Maximum 5 Ohms preferred; up to 15 Ohms acceptable for general regulation
Reverse leakage current: 2-3 µA range
Forward voltage: 1.1-1.5 V @ 200 mA
Operating temperature range: Minimum -65°C to 175°C

Substitute parts are grouped into three categories:

Category 1: Direct Equivalents (Same Package, Same Power Rating) Parts with 6.8 V nominal voltage, 500 mW power rating, and DO-35 package. These include 1N5235B, 1N5235BTR, BZX79C6V8, and BZX79C6V8-T50A. Tolerance variations (±2% to ±5%) are acceptable based on circuit requirements.

Category 2: Alternative Package Format (Different Package, Same Power Rating) The 1N754A provides 6.8 V, 500 mW in DO-7 (DO-204AA) package. This substitution is valid when board layout or assembly equipment requires a different axial lead configuration.

Category 3: Reduced Power Rating (Same Package, Lower Power Rating) Parts BZX79-B6V8,113, BZX79-B6V8,133, and BZX79-B6V8,143 provide 6.8 V at 400 mW in DO-35 package. These are suitable for applications where the circuit current does not exceed 400 mW dissipation limits.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Package	Vf @ If (V @ mA)	Temp Range (°C)	RoHS Status
1N5235C-TAP	Vishay	6.8	±2%	500	5	DO-35	1.1 @ 200	-	ROHS3
1N5235B	Microchip	6.8	±5%	500	5	DO-35	1.5 @ 200	-65 to 175	Non-compliant
1N5235BTR	Fairchild	6.8	±5%	500	5	DO-35	1.2 @ 200	-65 to 200	-
1N754A	Microchip	6.8	±5%	500	5	DO-7	1.1 @ 200	-65 to 175	Non-compliant
BZX79-B6V8,113	NXP USA Inc.	6.8	±2%	400	15	DO-35	0.9 @ 10	-65 to 200	-
BZX79-B6V8,133	Nexperia USA Inc.	6.8	±2%	400	15	DO-35	0.9 @ 10	-65 to 200	ROHS3
BZX79-B6V8,143	NXP USA Inc.	6.8	±2%	400	15	DO-35	0.9 @ 10	-65 to 200	-
BZX79C6V8	Taiwan Semiconductor	6.8	±5%	500	15	DO-35	1.5 @ 100	-65 to 175	ROHS3
BZX79C6V8-T50A	Fairchild	6.8	±5%	500	15	DO-35	1.5 @ 100	-65 to 200	-

Engineering Selection Recommendations

For Direct Replacement (Same Electrical Performance):

Select 1N5235BTR (Fairchild Semiconductor) when the original 1N5235C-TAP is unavailable. This part maintains identical 6.8 V nominal voltage, 500 mW power rating, and DO-35 package. The extended operating temperature range (-65°C to 200°C) provides additional thermal margin compared to the original specification. Forward voltage specification (1.2 V @ 200 mA) falls between the original and alternative options, ensuring circuit compatibility.

For ROHS3 Compliance Requirement:

Select BZX79C6V8 (Taiwan Semiconductor Corporation) when ROHS3 compliance is mandatory. This part provides 6.8 V, 500 mW in DO-35 package with confirmed ROHS3 status. The ±5% tolerance is acceptable for general voltage regulation applications. Note that impedance is specified at 15 Ohms maximum, which may affect regulation characteristics in high-impedance circuits.

For Automotive Grade Applications:

The original 1N5235C-TAP carries AEC-Q101 qualification. No substitute parts in the provided list include automotive qualification documentation. If AEC-Q101 qualification is required, the original part or a qualified equivalent from the manufacturer must be specified.

For Reduced Power Dissipation Circuits:

Select BZX79-B6V8,133 (Nexperia USA Inc.) when circuit design limits current to 400 mW or less. This part maintains ±2% tolerance matching the original specification and includes ROHS3 compliance. The extended temperature range (-65°C to 200°C) and ±2% tolerance provide performance equivalent to the original part within the reduced power envelope.

For Alternative Package Requirement:

Select 1N754A (Microchip Technology) when DO-7 (DO-204AA) package is required for assembly or layout constraints. This part provides identical 6.8 V, 500 mW specifications with forward voltage matching the original (1.1 V @ 200 mA). Package change from DO-35 to DO-7 affects only physical lead configuration and board footprint.

Frequently Asked Questions (FAQ)

Q: Can I substitute 1N5235B for 1N5235C-TAP in a precision voltage reference circuit?

A: The 1N5235B has ±5% tolerance compared to the original ±2% tolerance. In precision applications where voltage accuracy is critical, this tolerance difference may cause circuit performance degradation. Verify that the circuit design accommodates ±5% zener voltage variation before substitution.

Q: What is the difference between BZX79-B6V8,113 and BZX79-B6V8,133?

A: Both parts provide identical electrical specifications: 6.8 V, 400 mW, ±2% tolerance, and DO-35 package. The primary difference is packaging format: BZX79-B6V8,113 is supplied in bulk, while BZX79-B6V8,133 is supplied in cut tape. BZX79-B6V8,133 also carries ROHS3 compliance certification. Select based on assembly process requirements and compliance mandates.

Q: Can I use BZX79C6V8-T50A as a direct replacement for 1N5235C-TAP?

A: BZX79C6V8-T50A provides the same 6.8 V, 500 mW specifications and DO-35 package. However, impedance is specified at 15 Ohms maximum versus 5 Ohms for the original part. In circuits sensitive to zener impedance (such as high-frequency noise filtering), this difference may affect performance. Verify circuit requirements before substitution.

Q: Why would I choose 1N754A if it has a different package?

A: The 1N754A (DO-7 package) is selected when board layout or automated assembly equipment is configured for DO-7 axial leads rather than DO-35. Electrical performance is equivalent to the original part. Package selection is driven by manufacturing process constraints, not electrical requirements.

Q: Is BZX79C6V8 suitable for automotive applications?

A: BZX79C6V8 does not carry AEC-Q101 automotive qualification. If the application requires automotive-grade components, this part is not suitable. The original 1N5235C-TAP includes AEC-Q101 qualification; substitute parts must be verified for equivalent automotive certification if required.

Q: What does the impedance (Zzt) parameter mean for zener diode substitution?

A: Impedance (Zzt) affects the zener diode's ability to maintain stable voltage under varying load conditions. Lower impedance (5 Ohms) provides better voltage regulation. Higher impedance (15 Ohms) results in greater voltage variation with load changes. Select based on circuit regulation requirements: precision circuits require lower impedance; general-purpose applications tolerate higher impedance.

Q: Can I substitute a 400 mW zener for a 500 mW application?

A: Substitution of 400 mW parts (BZX79-B6V8 series) for 500 mW applications is valid only if circuit analysis confirms that actual power dissipation does not exceed 400 mW. Exceeding the rated power dissipation causes component failure. Verify circuit current and voltage conditions before selecting reduced-power alternatives.

Q: What is the significance of RoHS compliance status in zener diode selection?

A: ROHS3 compliance indicates the part contains no restricted substances (lead, cadmium, mercury, etc.). Selection depends on end-product regulatory requirements. If the final product must meet ROHS3 standards, all components including zener diodes must carry ROHS3 certification. Non-compliant parts are suitable only for applications without ROHS3 mandates.

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