Request Quote
(Ships tomorrow)
BZX85C6V8 Equivalent & Substitute Parts
Part Overview
The BZX85C6V8 is a through-hole zener diode manufactured by onsemi, rated at 6.8 V nominal zener voltage with 1 W maximum power dissipation. The device features ±6% voltage tolerance and operates across a temperature range of -65°C to 200°C in a DO-204AL (DO-41) axial package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 6.8 | V |
| Tolerance | ±6% | — |
| Power - Max | 1 | W |
| Impedance (Max) | 3.5 | Ohms |
| Current - Reverse Leakage @ Vr | 1 | µA @ 4 V |
| Voltage - Forward (Vf) (Max) @ If | 1.2 | V @ 200 mA |
| Operating Temperature | -65 to 200 | °C |
| Mounting Type | Through Hole | — |
| Package / Case | DO-204AL, DO-41, Axial | — |
Substitute Part Grouping Explanation
Substitution of the BZX85C6V8 is determined by the following critical parameters:
Electrical Compatibility Requirements:
- Zener voltage (Vz) must be 6.8 V nominal
- Voltage tolerance must accommodate ±6% or tighter specification
- Maximum power rating must equal or exceed 1 W
- Impedance (Zzt) must not exceed 3.5 Ohms
- Reverse leakage current must not exceed specified limits
- Forward voltage drop must remain within acceptable operating margins
Mechanical Compatibility Requirements:
- Mounting type: Through Hole (axial lead configuration)
- Package designation: DO-204AL or DO-41 equivalent
- Lead spacing and physical dimensions must match circuit board layout
Operational Requirements:
- Operating temperature range must encompass or exceed -65°C to 200°C
- Product status should be active to ensure long-term availability
Substitute parts are grouped into three categories: parametric equivalents (matching all electrical specifications), similar parts (meeting core electrical requirements with minor deviations), and direct alternatives (same base part number from different manufacturers or packaging variants).
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vz (V) | Tolerance | Power (W) | Zzt (Ohms) | Vf @ 200mA (V) | Temp Range (°C) | Package | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| BZX85C6V8 | onsemi | 6.8 | ±6% | 1 | 3.5 | 1.2 | -65 to 200 | DO-204AL | Obsolete |
| 1N4736AE3/TR13 | Microchip Technology | 6.8 | ±5% | 1 | 3.5 | 1.2 | -65 to 150 | DO-204AL | Active |
| 1N4736AP/TR8 | Microchip Technology | 6.8 | ±5% | 1 | 3.5 | 1.2 | -65 to 150 | DO-204AL | Active |
| 1N4736AG | Microsemi Corporation | 6.8 | ±5% | 1 | 3.5 | 1.2 | -65 to 175 | DO-204AL | Active |
| 1N4736 G | Microsemi Corporation | 6.8 | ±10% | 1 | 3.5 | 1.2 | -65 to 175 | DO-204AL | Active |
| 1N3016B-1 | Microchip Technology | 6.8 | ±5% | 1 | 3.5 | 1.2 | -55 to 175 | DO-204AL | Active |
| 1N4736A | Lumimax Optoelectronic Technology | 6.8 | ±5% | 1 | 3.5 | 1.2 | -65 to 200 | DO-41G | Active |
| BZX85C6V8-TR | Vishay General Semiconductor - Diodes Division | 6.8 | ±5% | 1.3 | 3.5 | — | -55 to 175 | DO-204AL | Active |
| 1N5921BRLG | onsemi | 6.8 | ±5% | 3 | 2.5 | 1.5 | -65 to 200 | DO-41 | Active |
| 1N5235B | Microchip Technology | 6.8 | ±5% | 0.5 | 5 | 1.5 | -65 to 175 | DO-35 | Active |
| 1EZ6.8D5-TP | Micro Commercial Co | 6.8 | ±5% | 0.125 | 3.5 | 1.2 | -55 to 150 | DO-41 | Active |
Engineering Selection Recommendations
Parametric Equivalents (Direct Replacement Candidates):
1N4736AE3/TR13 and 1N4736AP/TR8 (Microchip Technology) are parametric equivalents with identical electrical specifications to the BZX85C6V8 except for operating temperature range (-65°C to 150°C versus -65°C to 200°C). Both are ROHS3 compliant and active products. Selection between these two variants depends on packaging requirements (Tape & Reel format).
1N4736A (Lumimax Optoelectronic Technology) matches all electrical parameters including the full -65°C to 200°C operating range and is RoHS compliant. This part is suitable for applications requiring extended temperature operation.
Active Alternatives with Acceptable Deviations:
1N4736AG (Microsemi Corporation) provides 1 W power rating with ±5% tolerance and -65°C to 175°C operating range. RoHS non-compliant status may restrict use in regulated applications.
1N3016B-1 (Microchip Technology) delivers 1 W power with ±5% tolerance but operates to -55°C minimum (versus -65°C). RoHS non-compliant.
BZX85C6V8-TR (Vishay General Semiconductor - Diodes Division) offers 1.3 W power rating with ±5% tolerance, AEC-Q101 automotive qualification, and ROHS3 compliance. Operating range is -55°C to 175°C. This part is suitable for automotive applications requiring higher power margin.
Higher Power Alternatives:
1N5921BRLG (onsemi) provides 3 W power dissipation with 2.5 Ohm impedance, matching the full -65°C to 200°C temperature range and ROHS3 compliance. This part is suitable for applications requiring increased thermal headroom.
Lower Power Alternatives:
1N5235B (Microchip Technology) is rated at 500 mW with DO-35 package. This part is suitable only for low-power applications and is RoHS non-compliant.
1EZ6.8D5-TP (Micro Commercial Co) is rated at 125 mW with DO-41 package. This part is suitable only for minimal power applications with -55°C to 150°C operating range.
Compliance Considerations:
For applications requiring RoHS3 compliance, select from: 1N4736AE3/TR13, 1N4736AP/TR8, 1N4736A, BZX85C6V8-TR, or 1N5921BRLG.
For automotive applications requiring AEC-Q101 qualification, select BZX85C6V8-TR.
For extended temperature operation (-65°C to 200°C), select 1N4736A or 1N5921BRLG.
Frequently Asked Questions (FAQ)
Q: Can I use 1N4736AE3/TR13 as a direct replacement for BZX85C6V8?
A: 1N4736AE3/TR13 is electrically compatible with identical 6.8 V zener voltage, ±5% tolerance, 1 W power rating, and 3.5 Ohm impedance. The operating temperature range is -65°C to 150°C, which is narrower than the original -65°C to 200°C specification. Use this part only if your application does not require operation above 150°C.
Q: What is the difference between 1N4736AP/TR8 and 1N4736AE3/TR13?
A: Both parts are electrically identical 6.8 V, 1 W zener diodes from Microchip Technology with ±5% tolerance and -65°C to 150°C operating range. The difference is packaging format: TR8 indicates Tape & Reel on 8mm tape, while TR13 indicates Tape & Reel on 13mm tape. Selection depends on your assembly equipment compatibility.
Q: Why would I choose 1N5921BRLG over 1N4736A?
A: 1N5921BRLG provides 3 W power dissipation versus 1 W, offering greater thermal margin in high-current applications. Both parts operate across -65°C to 200°C and are ROHS3 compliant. Choose 1N5921BRLG if your circuit dissipates power approaching or exceeding 1 W.
Q: Is BZX85C6V8-TR suitable for automotive applications?
A: Yes. BZX85C6V8-TR carries AEC-Q101 automotive qualification and ROHS3 compliance. It provides 1.3 W power rating with ±5% tolerance and DO-204AL package. Operating range is -55°C to 175°C, which is narrower than the original -65°C to 200°C specification.
Q: Can I use 1N5235B as a substitute?
A: 1N5235B is not recommended as a direct substitute. While it provides 6.8 V zener voltage with ±5% tolerance, it is rated at only 500 mW power dissipation (half the original 1 W rating). Additionally, it uses a DO-35 package instead of DO-204AL, and is RoHS non-compliant. Use this part only in low-power applications where 500 mW dissipation is sufficient.
Q: What does ±5% tolerance mean compared to the original ±6%?
A: Tolerance specifies the allowable deviation of the zener voltage from the nominal 6.8 V value. ±5% tolerance (±0.34 V) is tighter than ±6% tolerance (±0.408 V), meaning the substitute part maintains zener voltage closer to the nominal specification. This is generally advantageous for precision voltage regulation applications.
Q: Are all substitute parts RoHS compliant?
A: No. RoHS compliance varies by manufacturer and part number. 1N4736AE3/TR13, 1N4736AP/TR8, 1N4736A, BZX85C6V8-TR, and 1N5921BRLG are ROHS3 compliant. 1N4736 G, 1N3016B-1, and 1N5235B are RoHS non-compliant. Verify compliance requirements for your application before selection.
Q: What is the significance of the DO-204AL package designation?
A: DO-204AL is the standardized package designation for axial-lead through-hole diodes with specific lead diameter, spacing, and physical dimensions. All primary substitute candidates use DO-204AL or equivalent DO-41 package, ensuring mechanical compatibility with existing circuit board layouts and assembly processes.
Q: Can I use 1EZ6.8D5-TP in place of BZX85C6V8?
A: 1EZ6.8D5-TP is not suitable as a general substitute. It is rated at only 125 mW power dissipation, which is 8% of the original 1 W rating. Use this part only in applications with minimal power requirements and operating temperatures between -55°C and 150°C.
Q: What does "Impedance (Max) (Zzt)" mean in the context of zener diode selection?
A: Impedance (Zzt) represents the dynamic impedance of the zener diode at the specified test current. Lower impedance values indicate better voltage regulation characteristics. The original BZX85C6V8 and most substitute parts specify 3.5 Ohm maximum impedance, ensuring consistent voltage regulation performance. 1N5921BRLG specifies 2.5 Ohm impedance, providing superior regulation.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts