1N4702-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4702-TP is a 15 V, 500 mW Zener diode manufactured by Micro Commercial Co in DO-35 axial package configuration. This component is classified as obsolete, indicating discontinued production by the original manufacturer. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this Zener diode specification.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	15 V
Tolerance	±5%
Power - Max	500 mW
Current - Reverse Leakage @ Vr	50 nA @ 11.4 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA
Package / Case	DO-204AH, DO-35, Axial
Mounting Type	Through Hole
Operating Temperature	200°C (TJ)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 1N4702-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 15 V (exact match required)
Tolerance: ±5% (exact match required)
Power - Max: 500 mW (exact match required)
Package / Case: DO-204AH, DO-35, Axial (exact match required)
Mounting Type: Through Hole (exact match required)

Secondary Compatibility Parameters:

Current - Reverse Leakage @ Vr: 50 nA or 100 nA @ specified voltage
Voltage - Forward (Vf) (Max) @ If: 1.1 V to 1.5 V range
Operating Temperature: Minimum 200°C (TJ) or equivalent range
RoHS Status: ROHS3 Compliant

All substitute parts listed meet the primary substitution criteria. Variations in secondary parameters indicate different manufacturing series or design revisions that remain functionally compatible within the specified electrical envelope.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Vf (Max) @ If	Ir @ Vr	Operating Temp (°C)	Package	Status
1N4702-TP	Micro Commercial Co	15	±5%	500	1.5 V @ 100 mA	50 nA @ 11.4 V	200 (TJ)	DO-35	Obsolete
1N4702 TR PBFREE	Central Semiconductor Corp	15	±5%	500	1.5 V @ 100 mA	50 nA @ 11.4 V	-65 ~ 200 (TJ)	DO-35	Active
1N5245B-TAP	Vishay General Semiconductor - Diodes Division	15	±5%	500	1.1 V @ 200 mA	100 nA @ 11 V	175 (TJ)	DO-35	Active
BZX55C15-TAP	Vishay General Semiconductor - Diodes Division	15	±5%	500	1.5 V @ 200 mA	100 nA @ 11 V	-65 ~ 175 (TJ)	DO-35	Active
BZX55C15-TR	Vishay General Semiconductor - Diodes Division	15	±5%	500	1.5 V @ 200 mA	100 nA @ 11 V	-65 ~ 175 (TJ)	DO-35	Active
BZX79C15-T50A	Fairchild Semiconductor	15	±5%	500	1.5 V @ 100 mA	50 nA @ 10.5 V	-65 ~ 200	DO-35	Active
BZX79C15-T50R	Fairchild Semiconductor	15	±5%	500	1.5 V @ 100 mA	50 nA @ 10.5 V	-65 ~ 200	DO-35	Active

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

The 1N4702 TR PBFREE (Central Semiconductor Corp) provides the most direct replacement for the obsolete 1N4702-TP. This part maintains identical electrical specifications including reverse leakage current (50 nA @ 11.4 V) and forward voltage characteristics (1.5 V @ 100 mA). The part is currently in active production status with ROHS3 compliance and extended operating temperature range (-65°C ~ 200°C), providing superior thermal performance compared to the original specification.

Automotive-Grade Alternatives:

The BZX55C15-TR and BZX55C15-TAP (Vishay General Semiconductor - Diodes Division) are automotive-qualified components meeting AEC-Q101 certification. These parts maintain the 15 V, 500 mW specification with active production status. Operating temperature range extends to -65°C ~ 175°C. Impedance specification (30 Ohms maximum) is provided for these parts, enabling precise circuit analysis in applications requiring impedance data.

The 1N5245B-TAP (Vishay General Semiconductor - Diodes Division) is also automotive-qualified with AEC-Q101 certification. This part features lower forward voltage (1.1 V @ 200 mA) and is suitable for applications where reduced forward voltage drop is beneficial. Operating temperature is specified to 175°C (TJ).

Extended Temperature Range Alternative:

The BZX79C15-T50A and BZX79C15-T50R (Fairchild Semiconductor) offer extended operating temperature range (-65°C ~ 200°C) matching the original 1N4702-TP specification. These parts maintain 50 nA reverse leakage current @ 10.5 V and 1.5 V forward voltage @ 100 mA, providing electrical equivalence to the original design.

Selection Basis:

All substitute parts listed are currently in active production status, ensuring long-term supply availability. All parts maintain ROHS3 compliance and are classified as EAR99 for export control purposes. Selection between alternatives should be based on packaging requirements (Tape & Reel, Cut Tape, or Bulk), automotive qualification needs, and thermal performance requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the 1N4702 TR PBFREE directly replace the 1N4702-TP in existing designs?

A: Yes. The 1N4702 TR PBFREE maintains identical electrical specifications for Zener voltage (15 V), tolerance (±5%), power rating (500 mW), reverse leakage current (50 nA @ 11.4 V), and forward voltage (1.5 V @ 100 mA). Both components use DO-35 axial package configuration. The primary difference is packaging format (Tape & Reel versus bulk) and extended operating temperature range on the substitute part.

Q: What is the difference between BZX55C15-TR and BZX55C15-TAP?

A: Both parts are identical in electrical specifications and manufacturing (Vishay General Semiconductor - Diodes Division, BZX55 series). The difference is packaging format: BZX55C15-TR is supplied in Tape & Reel (TR) format, while BZX55C15-TAP is supplied in Cut Tape (CT) format. Both are automotive-qualified to AEC-Q101 and suitable for automated assembly processes.

Q: Are the Fairchild BZX79C15 parts suitable for automotive applications?

A: The BZX79C15-T50A and BZX79C15-T50R are not listed with automotive qualification or AEC-Q101 certification. These parts are suitable for industrial and commercial applications requiring extended temperature range (-65°C ~ 200°C). For automotive applications, select BZX55C15-TR, BZX55C15-TAP, or 1N5245B-TAP, which carry AEC-Q101 qualification.

Q: What does the "PBFREE" designation in 1N4702 TR PBFREE indicate?

A: PBFREE indicates lead-free manufacturing compliance. This part is manufactured without lead content, meeting RoHS3 requirements. The electrical performance is identical to the original 1N4702-TP specification.

Q: Can I use 1N5245B-TAP as a substitute if my circuit requires 50 nA reverse leakage current?

A: The 1N5245B-TAP specifies 100 nA reverse leakage current @ 11 V, which is higher than the original 1N4702-TP specification of 50 nA @ 11.4 V. If your circuit design requires the lower leakage specification, select 1N4702 TR PBFREE, BZX79C15-T50A, or BZX79C15-T50R, which all specify 50 nA reverse leakage current.

Q: What is the significance of impedance (Zzt) specifications listed for some parts?

A: Impedance (Zzt) is the dynamic impedance of the Zener diode at the specified Zener current. BZX55 series parts specify 30 Ohms maximum impedance, while this parameter is not provided for 1N4702 variants or BZX79 series. Lower impedance indicates better voltage regulation characteristics. If impedance specification is critical to your application, select BZX55C15-TR or BZX55C15-TAP.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 Compliant status. The original 1N4702-TP also meets ROHS3 requirements. All parts are suitable for applications requiring RoHS3 compliance.

Q: What packaging options are available for 15 V, 500 mW Zener diodes in DO-35?

A: Substitute parts are available in three packaging formats: Tape & Reel (TR) for automated assembly, Cut Tape (CT) for semi-automated or manual assembly, and Bulk for high-volume applications. Select packaging based on assembly process requirements and order quantity.

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