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BZX85C27 A0G Equivalent & Substitute Parts
Part Overview
The BZX85C27 A0G is a 27 V Zener diode rated at 1.3 W maximum power dissipation, manufactured by Taiwan Semiconductor Corporation. This through-hole component operates across a temperature range of -65°C to 200°C and is housed in a DO-204AL (DO-41) axial package. The device maintains a ±5% voltage tolerance and is RoHS3 compliant with REACH unaffected status. The part is currently active in production with 1179 units in stock. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity for applications requiring 27 V Zener regulation at 1.3 W power levels.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nominal) | 27 | V |
| Tolerance | ±5% | — |
| Power - Maximum | 1.3 | W |
| Impedance (Maximum) | 30 | Ohms |
| Current - Reverse Leakage @ Vr | 500 nA @ 20 V | — |
| Voltage - Forward (Maximum) @ If | 1.2 V @ 10 mA | — |
| Operating Temperature Range | -65 to 200 | °C |
| Mounting Type | Through Hole | — |
| Package / Case | DO-204AL, DO-41, Axial | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the BZX85C27 A0G is determined by strict alignment of electrical and mechanical parameters. The critical substitution criteria are:
Primary Matching Parameters:
- Zener voltage: 27 V nominal
- Voltage tolerance: ±5% or tighter
- Power rating: 1.3 W or greater
- Package type: DO-204AL (DO-41) axial through-hole
- Operating temperature range: Must encompass or match -65°C to 200°C
- Reverse leakage current: 500 nA @ 20 V or lower
- Forward voltage: 1.2 V @ specified current or lower
Substitution Categories:
Direct Equivalents (Identical Electrical and Mechanical Specifications): Parts meeting all primary parameters with matching impedance (30 Ohms) and identical power ratings (1.3 W).
Compatible Substitutes (Same Voltage and Package, Relaxed Power Rating): Parts with 27 V nominal voltage, ±5% tolerance, DO-41 package, but rated at 1 W power dissipation. These are suitable where circuit design permits lower power handling.
Enhanced Substitutes (Same Voltage and Package, Increased Power Rating): Parts with 27 V nominal voltage, ±5% tolerance, DO-41 package, but rated at 2 W or 3 W power dissipation. These provide additional thermal margin and are backward compatible.
Tighter Tolerance Variants (±2% Tolerance): Parts with 27 V nominal voltage, ±2% tolerance (tighter than ±5%), 1.3 W power rating, and DO-41 package. These are suitable for applications requiring improved voltage regulation accuracy.
Parameter Comparison
| Part Number | Manufacturer | Vz (V) | Tolerance | Power (W) | Zzt (Ohms) | Ir @ Vr (nA) | Vf (V) @ If | Temp Range (°C) | Package | Grade |
|---|---|---|---|---|---|---|---|---|---|---|
| BZX85C27 A0G | Taiwan Semiconductor | 27 | ±5% | 1.3 | 30 | 500 @ 20 V | 1.2 @ 10 mA | -65 to 200 | DO-204AL | — |
| 1N4750A | Lumimax Optoelectronic | 27 | ±5% | 1 | 35 | 5000 @ 20.6 V | 1.2 @ 200 mA | -65 to 200 | DO-41G | — |
| 1N4750A-T50A | onsemi | 27 | ±5% | 1 | 35 | 5000 @ 20.6 V | — | -65 to 200 | DO-41 | — |
| 1N4750A-TAP | Vishay General Semiconductor | 27 | ±5% | 1.3 | 35 | 5000 @ 20.6 V | 1.2 @ 200 mA | -65 to 175 | DO-204AL | Automotive |
| 1N4750ATR | Fairchild Semiconductor | 27 | ±5% | 1 | 35 | 5000 @ 20.6 V | — | -65 to 200 | DO-204AL | — |
| 1N5935BRLG | onsemi | 27 | ±5% | 3 | 23 | 1000 @ 20.6 V | 1.5 @ 200 mA | -65 to 200 | Axial | — |
| 2EZ27D5-TP | Micro Commercial Co | 27 | ±5% | 2 | 18 | 500 @ 20.6 V | 1.2 @ 200 mA | -55 to 150 | DO-41 | — |
| BZX85B27-TAP | Vishay General Semiconductor | 27 | ±2% | 1.3 | 30 | 500 @ 20 V | — | -55 to 175 | DO-204AL | Automotive |
| BZX85B27-TR | Vishay General Semiconductor | 27 | ±2% | 1.3 | 30 | 500 @ 20 V | — | -55 to 175 | DO-204AL | Automotive |
| BZX85C27-TR | Vishay General Semiconductor | 27 | ±5% | 1.3 | 30 | 500 @ 20 V | — | -55 to 175 | DO-204AL | Automotive |
| ZPY27-TR | Vishay General Semiconductor | 27 | ±5% | 1.3 | 9 | 500 @ 20 V | — | -65 to 175 | DO-204AL | Automotive |
Engineering Selection Recommendations
Direct Equivalents: The BZX85C27-TR and ZPY27-TR from Vishay General Semiconductor are direct electrical equivalents with identical 27 V nominal voltage, ±5% tolerance, 1.3 W power rating, and DO-204AL package. Both are AEC-Q101 qualified automotive-grade components. The BZX85C27-TR maintains the same impedance (30 Ohms) as the main part, while ZPY27-TR offers lower impedance (9 Ohms). Both operate within the -55°C to 175°C range, which covers the primary operating window of the BZX85C27 A0G.
Tighter Tolerance Variants: The BZX85B27-TAP and BZX85B27-TR offer ±2% voltage tolerance compared to the ±5% of the main part, providing improved regulation accuracy. Both maintain 1.3 W power rating, 30 Ohms impedance, and DO-204AL packaging. These are AEC-Q101 qualified automotive-grade parts suitable for applications requiring tighter voltage control. Operating temperature range is -55°C to 175°C.
Compatible Substitutes (1 W Rating): The 1N4750A-T50A (onsemi) and 1N4750ATR (Fairchild Semiconductor) are 1 W rated alternatives with 27 V nominal voltage and ±5% tolerance. Both use DO-41 packaging and operate across -65°C to 200°C. These are suitable where circuit design permits lower power dissipation. The 1N4750A from Lumimax Optoelectronic Technology is also a 1 W option with identical electrical specifications.
Enhanced Substitutes (Higher Power Rating): The 1N5935BRLG (onsemi) provides 3 W power rating with 27 V nominal voltage and ±5% tolerance. This part offers increased thermal margin and lower impedance (23 Ohms). Operating temperature range is -65°C to 200°C. The 2EZ27D5-TP (Micro Commercial Co) provides 2 W power rating with 27 V nominal voltage, ±5% tolerance, and 18 Ohms impedance. Operating temperature range is -55°C to 150°C.
Compliance and Certification: All substitute parts listed are RoHS3 compliant and REACH unaffected. The Vishay parts (BZX85B27-TAP, BZX85B27-TR, BZX85C27-TR, ZPY27-TR) and 1N4750A-TAP carry AEC-Q101 automotive qualification, suitable for automotive and high-reliability applications.
Frequently Asked Questions (FAQ)
Q: Can I substitute the BZX85C27 A0G with a 1 W rated Zener diode?
A: Yes, if circuit design permits. The 1N4750A-T50A, 1N4750ATR, and 1N4750A are all 1 W rated alternatives with matching 27 V nominal voltage and ±5% tolerance. However, the main part is rated at 1.3 W, so substitution with lower power ratings reduces thermal margin. Verify that circuit current and power dissipation requirements do not exceed 1 W.
Q: What is the difference between BZX85B27 and BZX85C27?
A: The primary difference is voltage tolerance. BZX85B27 offers ±2% tolerance, while BZX85C27 offers ±5% tolerance. Both maintain identical 27 V nominal voltage, 1.3 W power rating, 30 Ohms impedance, and DO-204AL packaging. BZX85B27 is selected for applications requiring tighter voltage regulation accuracy.
Q: Are the Vishay BZX85C27-TR and ZPY27-TR interchangeable?
A: Both are direct electrical equivalents with 27 V nominal voltage, ±5% tolerance, 1.3 W power rating, and DO-204AL packaging. The key difference is impedance: BZX85C27-TR has 30 Ohms impedance (matching the main part), while ZPY27-TR has 9 Ohms impedance (lower). Both are AEC-Q101 qualified. Selection depends on impedance requirements for the specific application.
Q: Can I use a 3 W rated Zener diode as a substitute?
A: Yes. The 1N5935BRLG is a 3 W rated alternative with 27 V nominal voltage and ±5% tolerance. Higher power rating provides additional thermal margin and is backward compatible. However, verify that the package type (axial) and impedance (23 Ohms) are acceptable for the application.
Q: What is the operating temperature difference between the main part and substitutes?
A: The BZX85C27 A0G operates from -65°C to 200°C. Most substitutes operate from -65°C to 175°C or -55°C to 175°C, which covers typical industrial and automotive temperature ranges. The 2EZ27D5-TP has a narrower range of -55°C to 150°C. Verify that the substitute's temperature range meets application requirements.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the compliance status of the main part BZX85C27 A0G.
Q: Which substitutes are automotive qualified?
A: The following parts carry AEC-Q101 automotive qualification: 1N4750A-TAP, BZX85B27-TAP, BZX85B27-TR, BZX85C27-TR, and ZPY27-TR. These are suitable for automotive and high-reliability applications.
Q: What does impedance (Zzt) mean in Zener diode selection?
A: Impedance (Zzt) is the dynamic impedance of the Zener diode in the reverse breakdown region. Lower impedance indicates better voltage regulation and lower output impedance. The main part has 30 Ohms impedance. Substitutes with lower impedance (such as ZPY27-TR at 9 Ohms or 1N5935BRLG at 23 Ohms) provide improved regulation performance.
Q: Can I substitute based on package type alone?
A: No. Package type is necessary but not sufficient for substitution. All electrical parameters must align: nominal voltage (27 V), tolerance (±5% or tighter), power rating (1.3 W or greater), and operating temperature range. Package compatibility ensures mechanical fit, but electrical specifications determine functional equivalence.
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