BZX85C7V5 Equivalent & Substitute Parts

Part Overview

The BZX85C7V5 is a 7.5 V, 1 W Zener diode manufactured by onsemi in DO-204AL (DO-41) axial through-hole package. This component is classified as obsolete, indicating discontinuation from the original manufacturer. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for applications utilizing this Zener diode specification.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	7.5 V
Power - Max	1 W
Tolerance	±6%
Impedance (Max)	3 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 4.5 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature Range	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial

Substitute Part Grouping Explanation

Substitution of the BZX85C7V5 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 7.5 V nominal
Package type: DO-204AL (DO-41) axial through-hole
Mounting type: Through hole
Operating temperature range compatibility
Power dissipation capability: minimum 1 W

Secondary Compatibility Factors:

Tolerance: ±6% or tighter (±5%, ±2%)
Impedance (Zzt): 3 Ohms or lower
Reverse leakage current: 1 µA @ 4.5 V or lower
Forward voltage: 1.2 V @ 200 mA or lower

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical or superior electrical specifications and active product status
Functional Alternatives: Parts with 7.5 V Zener voltage and DO-41 package but with variations in power rating, tolerance, or temperature range

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Package	Product Status	Operating Temp
BZX85C7V5	onsemi	7.5 V	±6%	1 W	3 Ohms	1 µA @ 4.5 V	DO-204AL (DO-41)	Obsolete	-65°C ~ 200°C
1N4737A	Lumimax Optoelectronic Technology	7.5 V	±5%	1 W	4 Ohms	10 µA @ 5 V	DO-204AL (DO-41)	Active	-65°C ~ 200°C
BZX85C7V5-TAP	Vishay General Semiconductor - Diodes Division	7.5 V	±5%	1.3 W	3 Ohms	1 µA @ 4.5 V	DO-204AL (DO-41)	Active	-55°C ~ 175°C
1N3017B-1	Microchip Technology	7.5 V	±5%	1 W	4 Ohms	100 µA @ 5.7 V	DO-204AL (DO-41)	Active	-55°C ~ 175°C
1N4737AE3/TR13	Microchip Technology	7.5 V	±5%	1 W	4 Ohms	10 µA @ 5 V	DO-204AL (DO-41)	Active	-65°C ~ 150°C
1N4737AP/TR12	Microchip Technology	7.5 V	±5%	1 W	4 Ohms	10 µA @ 5 V	DO-204AL (DO-41)	Active	-65°C ~ 150°C
1N4737CE3/TR13	Microchip Technology	7.5 V	±2%	1 W	4 Ohms	10 µA @ 5 V	DO-204AL (DO-41)	Active	-65°C ~ 150°C
1N4737CP/TR12	Microchip Technology	7.5 V	±2%	1 W	4 Ohms	10 µA @ 5 V	DO-204AL (DO-41)	Active	-65°C ~ 150°C
1N4737CP/TR8	Microchip Technology	7.5 V	±2%	1 W	4 Ohms	10 µA @ 5 V	DO-204AL (DO-41)	Active	-65°C ~ 150°C
1N4737CPE3/TR12	Microchip Technology	7.5 V	±2%	1 W	4 Ohms	10 µA @ 5 V	DO-204AL (DO-41)	Active	-65°C ~ 150°C
1N5343BRLG	onsemi	7.5 V	±5%	5 W	1.5 Ohms	10 µA @ 5.7 V	T-18, Axial	Active	-65°C ~ 200°C

Engineering Selection Recommendations

Tier 1 - Direct Equivalent (Recommended Primary Substitutes):

BZX85C7V5-TAP (Vishay General Semiconductor - Diodes Division) is the primary recommended substitute. This part maintains identical Zener voltage (7.5 V), identical impedance (3 Ohms), identical reverse leakage specification (1 µA @ 4.5 V), and identical package (DO-204AL DO-41). The part is active with AEC-Q101 automotive qualification and ROHS3 compliance. Power rating is increased to 1.3 W, providing enhanced thermal margin. Operating temperature range is -55°C ~ 175°C, which is narrower than the original but suitable for most applications.

Tier 2 - Functional Equivalents (Active Alternatives):

1N4737A (Lumimax Optoelectronic Technology) provides 7.5 V Zener voltage in DO-41 package with active product status. Tolerance is ±5% (tighter than original ±6%), and impedance is 4 Ohms (slightly higher than original 3 Ohms). Reverse leakage is 10 µA @ 5 V (higher than original 1 µA @ 4.5 V). Operating temperature range matches the original at -65°C ~ 200°C.

1N4737AE3/TR13, 1N4737AP/TR12, 1N4737CE3/TR13, 1N4737CP/TR12, 1N4737CP/TR8, 1N4737CPE3/TR12 (Microchip Technology) all provide 7.5 V Zener voltage in DO-41 package with active product status and ROHS3 compliance (except 1N4737AP/TR12 and 1N4737CP/TR12 which are RoHS non-compliant). These parts feature ±5% or ±2% tolerance (tighter than original ±6%), 4 Ohms impedance, and 10 µA @ 5 V reverse leakage. Operating temperature range is -65°C ~ 150°C, which is narrower than the original.

1N3017B-1 (Microchip Technology) provides 7.5 V Zener voltage in DO-41 package with active product status. However, reverse leakage is 100 µA @ 5.7 V, significantly higher than the original specification. This part is RoHS non-compliant. Use only when reverse leakage specification is not critical.

Tier 3 - Higher Power Alternative:

1N5343BRLG (onsemi) provides 7.5 V Zener voltage with 5 W power rating and superior impedance (1.5 Ohms). Package is T-18 axial, which is physically larger than DO-41. This part is suitable only when higher power dissipation is required and physical size constraints permit.

Frequently Asked Questions (FAQ)

Q: Can I use 1N4737A as a direct replacement for BZX85C7V5?

A: Yes. The 1N4737A provides identical Zener voltage (7.5 V) and package (DO-41 axial through-hole). Tolerance is ±5% compared to the original ±6%, which is acceptable. Impedance is 4 Ohms versus 3 Ohms in the original, and reverse leakage is 10 µA @ 5 V versus 1 µA @ 4.5 V. These differences are within acceptable ranges for most applications. The part is active with full inventory availability.

Q: What is the difference between BZX85C7V5-TAP and BZX85C7V5?

A: BZX85C7V5-TAP is manufactured by Vishay and is an active product, while BZX85C7V5 is obsolete from onsemi. Both share identical Zener voltage (7.5 V), impedance (3 Ohms), and reverse leakage (1 µA @ 4.5 V). BZX85C7V5-TAP has increased power rating (1.3 W versus 1 W) and includes AEC-Q101 automotive qualification. Operating temperature range is -55°C ~ 175°C versus -65°C ~ 200°C for the original.

Q: Why do some substitute parts have ±2% tolerance instead of ±6%?

A: Tighter tolerance (±2%) represents improved manufacturing precision and is a superior specification. Parts with ±2% tolerance (such as 1N4737CE3/TR13, 1N4737CP/TR12, 1N4737CP/TR8, 1N4737CPE3/TR12) can be used as direct replacements for the original ±6% part. The tighter tolerance provides better voltage regulation characteristics in circuit applications.

Q: Can I use 1N5343BRLG as a substitute?

A: 1N5343BRLG provides 7.5 V Zener voltage and is suitable only if higher power dissipation (5 W versus 1 W) is required. The package is T-18 axial, which is physically larger than the original DO-41 package. Verify that physical size constraints and circuit board layout accommodate the larger package before selection.

Q: What does "active" product status mean compared to "obsolete"?

A: Active product status indicates the part is currently manufactured and available from the supplier with ongoing production support. Obsolete status indicates the manufacturer has discontinued production. All recommended substitutes have active product status, ensuring long-term supply chain availability and support.

Q: Are there RoHS compliance differences between substitute parts?

A: Yes. BZX85C7V5-TAP, 1N4737A, 1N4737AE3/TR13, 1N4737CE3/TR13, and 1N4737CPE3/TR12 are ROHS3 compliant. 1N4737AP/TR12, 1N4737CP/TR12, 1N4737CP/TR8, and 1N3017B-1 are RoHS non-compliant. Select ROHS3 compliant parts for applications requiring environmental compliance.

Q: What is the significance of impedance (Zzt) differences?

A: Impedance affects voltage regulation characteristics. Lower impedance (3 Ohms in the original and BZX85C7V5-TAP) provides better voltage stability under load changes. Higher impedance (4 Ohms in most Microchip alternatives) results in slightly less stable voltage regulation. For most applications, this difference is negligible. Select lower impedance parts for precision voltage reference applications.

Q: Can I substitute parts with different operating temperature ranges?

A: Operating temperature range substitution depends on application requirements. If the application operates within the narrower range of the substitute part (for example, -55°C ~ 175°C for BZX85C7V5-TAP versus -65°C ~ 200°C for the original), the substitute is acceptable. If the application requires the full original temperature range, select substitutes with matching or wider temperature specifications.

Q: What is the difference between tape and reel (TR) and bulk packaging?

A: Tape and reel (TR) packaging is used for automated assembly processes and is supplied on continuous tape. Bulk packaging is used for manual assembly or small-quantity applications. Both provide identical electrical performance. Select based on assembly process requirements and order quantity.

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