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BZX85C8V2 Equivalent & Substitute Parts
Part Overview
The BZX85C8V2 is a through-hole Zener diode manufactured by onsemi, rated at 8.2 V nominal Zener voltage with 1 W maximum power dissipation in a DO-41 (DO-204AL) axial package. 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 or repair requirements for applications utilizing this Zener diode specification.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 8.2 | V |
| Tolerance | ±6% | - |
| Power - Max | 1 | W |
| Impedance (Max) | 5 | Ohms |
| Current - Reverse Leakage @ Vr | 1 | µA @ 5 V |
| Voltage - Forward (Vf) (Max) @ If | 1.2 | V @ 200 mA |
| Operating Temperature Range | -65 to 200 | °C |
| Mounting Type | Through Hole | - |
| Package / Case | DO-204AL, DO-41, Axial | - |
Substitute Part Grouping Explanation
Substitution of the BZX85C8V2 is determined by the following critical parameters:
Primary Matching Criteria:
- Zener voltage: 8.2 V nominal
- Package type: DO-41 (DO-204AL) through-hole axial configuration
- Power rating: 1 W or greater
- Forward voltage: 1.2 V maximum at 200 mA
- Operating temperature range: minimum -55°C to 150°C (acceptable for most applications requiring -65°C to 200°C)
Secondary Compatibility Factors:
- Voltage tolerance: ±5% to ±10% acceptable (original part specifies ±6%)
- Impedance: 4.5 to 5 Ohms maximum
- Reverse leakage current: 1 to 50 µA at specified reverse voltage
- Moisture sensitivity: MSL 1 (Unlimited)
Substitute parts meeting these criteria are functionally equivalent for voltage regulation, transient suppression, and reference applications. Parts with power ratings exceeding 1 W (such as BZX85C8V2-TR at 1.3 W) provide enhanced thermal margin and are direct upgrades. Parts with reduced power ratings (such as 1EZ8.2D5-TP at 125 mW) are suitable only for low-power applications.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vz (V) | Tolerance | Power (W) | Zzt (Ohms) | Vf @ 200mA (V) | Temp Range (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|
| BZX85C8V2 | onsemi | 8.2 | ±6% | 1 | 5 | 1.2 | -65 to 200 | Obsolete |
| 1N4738A | Lumimax Optoelectronic Technology | 8.2 | ±5% | 1 | 4.5 | 1.2 | -65 to 200 | Active |
| BZX85C8V2-TR | Vishay General Semiconductor - Diodes Division | 8.2 | ±5% | 1.3 | 5 | - | -55 to 175 | Active |
| 1EZ8.2D5-TP | Micro Commercial Co | 8.2 | ±5% | 0.125 | 4.5 | 1.2 | -55 to 150 | Active |
| 1N3018B-1 | Microchip Technology | 8.2 | ±5% | 1 | 4.5 | 1.2 | -55 to 175 | Active |
| 1N4738 G | Microsemi Corporation | 8.2 | ±10% | 1 | 4.5 | 1.2 | -65 to 175 | Active |
| 1N4738A G | Microsemi Corporation | 8.2 | ±5% | 1 | 4.5 | 1.2 | -65 to 175 | Active |
| 1N4738A,113 | Nexperia USA Inc. | 8.2 | ±5% | 1 | 4.5 | 1.2 | -65 to 200 | Active |
| 1N4738AE3/TR13 | Microchip Technology | 8.2 | ±5% | 1 | 4.5 | 1.2 | -65 to 150 | Active |
| 1N4738AP/TR12 | Microchip Technology | 8.2 | ±5% | 1 | 4.5 | 1.2 | -65 to 150 | Active |
| 1N4738AP/TR8 | Microchip Technology | 8.2 | ±5% | 1 | 4.5 | 1.2 | -65 to 150 | Active |
Engineering Selection Recommendations
Direct Equivalent (Preferred): The 1N4738A,113 manufactured by Nexperia USA Inc. is the most direct equivalent to the BZX85C8V2. It matches the original part across all critical parameters: 8.2 V nominal voltage, ±5% tolerance, 1 W power rating, and identical operating temperature range (-65°C to 200°C). This part carries ROHS3 compliance and active product status, ensuring long-term availability and supply chain stability.
Enhanced Performance Alternative: The BZX85C8V2-TR from Vishay General Semiconductor provides a 1.3 W power rating, exceeding the original 1 W specification. This part is qualified to AEC-Q101 automotive standards and carries ROHS3 compliance. The higher power rating provides additional thermal margin for applications subject to transient overvoltage conditions. Operating temperature range is -55°C to 175°C, which is acceptable for most industrial and commercial applications.
General-Purpose Substitutes: The 1N4738A G from Microsemi Corporation and 1N4738A variants from Microchip Technology are functionally equivalent with 1 W power ratings and ±5% tolerance. These parts are active and widely available. The Microsemi variant operates across -65°C to 175°C, matching the lower temperature limit of the original part.
Limited-Power Applications: The 1EZ8.2D5-TP from Micro Commercial Co is rated at 125 mW and is suitable only for low-power signal conditioning and reference applications where power dissipation does not exceed 125 mW. This part is not suitable for transient suppression or high-current applications.
Compliance Considerations: Parts with ROHS3 compliance (1N4738A,113, BZX85C8V2-TR, 1N4738AE3/TR13) are preferred for new designs and applications subject to environmental regulations. Parts with RoHS non-compliant status (1N4738AP/TR12, 1N4738AP/TR8, 1N4738A G) remain functionally equivalent but may face restrictions in certain markets or applications.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with a higher power rating than the original BZX85C8V2?
A: Yes. A substitute part with equal or greater power rating is functionally compatible. The BZX85C8V2-TR at 1.3 W provides enhanced thermal performance and is a direct upgrade. Higher power ratings do not affect circuit operation; they only increase the component's ability to dissipate heat without exceeding maximum junction temperature.
Q: What is the significance of voltage tolerance (±6% vs. ±5%)?
A: Voltage tolerance defines the acceptable deviation of the Zener voltage from the nominal 8.2 V specification. The original part specifies ±6%, while most substitutes specify ±5%. A tighter tolerance (±5%) provides better voltage regulation accuracy. Both tolerances are acceptable for general voltage regulation and transient suppression applications. Applications requiring precise voltage reference may benefit from the tighter ±5% tolerance.
Q: Are all substitute parts available in the same DO-41 package?
A: Yes. All listed substitute parts are packaged in DO-41 (DO-204AL) through-hole axial configuration, identical to the original BZX85C8V2. This ensures mechanical and electrical compatibility with existing PCB layouts and through-hole assembly processes.
Q: Can I use the 1EZ8.2D5-TP as a direct replacement?
A: The 1EZ8.2D5-TP is electrically compatible but has a reduced power rating of 125 mW compared to the original 1 W. This part is suitable only for applications where power dissipation remains below 125 mW. For standard voltage regulation or transient suppression applications requiring 1 W capability, use a 1 W rated substitute such as 1N4738A,113 or BZX85C8V2-TR.
Q: What is the difference between tape & reel (TR) and cut tape (CT) packaging?
A: Tape & reel (TR) and cut tape (CT) refer to the delivery format for automated assembly processes. Tape & reel provides components on continuous carrier tape suitable for pick-and-place machines. Cut tape provides pre-cut segments. Both formats contain identical components; the difference is in handling and assembly compatibility. Select based on your assembly equipment requirements.
Q: Does operating temperature range affect substitution compatibility?
A: Operating temperature range defines the safe operating limits for the component. The original BZX85C8V2 operates from -65°C to 200°C. Substitute parts with narrower ranges (such as -55°C to 175°C) are acceptable for applications operating within that narrower range. For applications requiring the full -65°C to 200°C range, select substitutes with matching or wider temperature specifications, such as 1N4738A,113 (-65°C to 200°C).
Q: Are RoHS-compliant parts required for my application?
A: RoHS compliance is mandatory for products sold in the European Union and many other markets. ROHS3-compliant parts (1N4738A,113, BZX85C8V2-TR, 1N4738AE3/TR13) are preferred for new designs and applications subject to environmental regulations. RoHS non-compliant parts remain functionally equivalent but may face market restrictions or require additional documentation for certain applications.
Q: What does MSL 1 (Unlimited) moisture sensitivity level mean?
A: MSL 1 (Unlimited) indicates that the component has no moisture sensitivity restrictions. These parts do not require special moisture-controlled storage, handling, or baking procedures prior to soldering. All listed substitute parts carry MSL 1 classification, ensuring compatibility with standard storage and assembly practices.
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