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onsemi BZX85C27
- Part No.:
- BZX85C27
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C27.pdf
- Description:
- DIODE ZENER 27V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:2,298
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Product details
Overview
BZX85C27 from onsemi is a 27 V ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, with nominal Zener voltage of 25.1–28.9 V at 30 mA test current, Zener impedance of 8 Ω at 30 mA, and leakage current ≤0.25 μA at 20.3 V reverse voltage. It provides stable voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the BZX85C27 datasheet, pinout, applications, or equivalent options, key selection criteria include its 27 V nominal Zener voltage, 1.0 W power rating at 25°C, DO-41 package compatibility, 5% tolerance, and low leakage performance below 0.25 μA at VR = 20.3 V.
Technical Context
The BZX85C27 operates as a silicon planar Zener diode optimized for voltage regulation and reference applications. Its breakdown mechanism is controlled avalanche, with thermal equilibrium measurement conditions (TL = 30°C ±1°C, 3/8" lead length) ensuring repeatable VZ specification.
It features a glass-passivated junction in a hermetically sealed DO-41 package, rated for operating temperatures from –65°C to +200°C and derated linearly above 50°C at 6.67 mW/°C. The cathode is marked by a color band on the glass body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.1 V min to 28.9 V max at IZ = 30 mA - defines usable regulation window under standard test conditions |
| Power Dissipation (PD) | 1.0 W at TA = 25°C - sets maximum continuous DC power handling without heatsinking |
| Zener Impedance (ZZ) | 8 Ω at IZ = 30 mA - indicates regulation stiffness; lower value enables tighter output voltage control under load variation |
| Leakage Current (IR) | ≤0.25 μA at VR = 20.3 V - ensures minimal standby current in high-impedance bias networks |
| Tolerance | ±5% - specifies manufacturing spread of VZ, critical for precision reference design margining |
| Package | DO-41 glass case - industry-standard axial leaded package with cathode band marking and JEDEC DO-204AL compliance |
| Operating Temp Range | –65°C to +200°C - supports deployment in automotive under-hood, industrial, and aerospace environments |
Pinout & Package
DO-41 glass package: axial leads, cathode identified by single color band on glass body; no polarity-sensitive PCB footprint beyond standard diode orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-biased regulation configuration; forms return path for Zener current |
| Cathode | Zener breakdown terminal / voltage reference node | Marked by color band; connected to higher-potential side in regulation mode; defines regulated output voltage relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage with tight 5% tolerance | Enables predictable reference accuracy without post-manufacturing trimming in cost-sensitive designs |
| Low leakage current (≤0.25 μA) | Minimizes error in high-resistance divider networks and preserves battery life in always-on monitoring circuits |
| DO-41 glass package with cathode band | Ensures mechanical robustness, hermetic sealing, and unambiguous polarity identification during manual or automated assembly |
| High-temperature operation up to +200°C | Supports use in engine control units, downhole tools, and other extreme-environment applications where plastic packages fail |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial Power Supply Overvoltage Clamp |
|---|---|
Use Scenario: Provides stable 27 V reference for analog-to-digital converter biasing and sensor signal conditioning in ECU microcontroller subsystems. IC Role / Device Role / Timing Role: Voltage reference diode supplying precise DC bias to op-amps and ADC input stages. Use Value: Maintains <±0.5% reference drift across –40°C to +125°C ambient due to low tempco and DO-41 thermal stability. | Use Scenario: Clamps transient surges on 24 V DC bus lines in PLC backplanes and motor drive power rails. IC Role / Device Role / Timing Role: Shunt overvoltage protection device diverting excess energy to ground when bus exceeds 28.9 V. Use Value: Absorbs 1.0 W surge energy without degradation, leveraging glass-package reliability and 200°C max junction rating. |
| Telecom Line Card Voltage Supervisor | Medical Instrument Battery Monitor Reference |
Use Scenario: Monitors -48 V telecom supply rail integrity using resistor-divider feedback into supervisor IC. IC Role / Device Role / Timing Role: Precision Zener reference generating threshold voltage for undervoltage/overvoltage detection. Use Value: Delivers ≤0.25 μA leakage at –36 V reverse bias, preventing false trips in high-impedance supervision circuits. | Use Scenario: Sets accurate 27 V trip point for lithium-ion battery pack overvoltage cutoff in portable diagnostic devices. IC Role / Device Role / Timing Role: Regulation element in comparator-based battery protection circuit. Use Value: Guarantees ±5% VZ tolerance across production lots, enabling consistent cell-balancing thresholds without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5254B | Same 27 V nominal VZ, but ±5% tolerance, 0.5 W rating, DO-35 package | Limited to lower-power applications; not suitable for 1.0 W sustained dissipation | Select only if board space or thermal budget restricts to smaller DO-35 footprint and power <0.5 W |
| MMSZ5254ET1G | 27 V VZ, ±5%, SOD-123 surface-mount package, 0.35 W rating | Requires rework for through-hole replacement; unsuitable for high-temp or high-reliability axial-lead designs | Choose for space-constrained PCBs where automated SMT assembly is mandatory and power <0.35 W |
Compared with BZX85C27, the 1N5254B offers identical voltage rating but reduced power handling and smaller package, while MMSZ5254ET1G trades axial reliability and 1.0 W capability for SMT compatibility and lower profile - neither is pin-compatible, and both require layout or thermal redesign.
Availability
BZX85C27 is available at Aetrix Electronics and suitable for automotive engine control units, industrial power supply clamping, telecom line card supervision, and medical battery monitor references requiring stable component supply and long-term manufacturability.
Supply support for BZX85C27 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The BZX85C27 belongs to the BZX85C series of general-purpose Zener diodes designed for reliable voltage regulation and reference functions in cost-sensitive, high-volume industrial and automotive systems.
FAQ
What is the nominal Zener voltage of the BZX85C27?
The BZX85C27 has a nominal Zener voltage of 27 V, specified as 25.1 V minimum to 28.9 V maximum at a test current of 30 mA and lead temperature of 30°C ±1°C. This range reflects its ±5% tolerance and ensures predictable regulation behavior in reference and clamp circuits where the BZX85C27 is deployed.
What package type does the BZX85C27 use?
The BZX85C27 uses the DO-41 glass axial-leaded package per JEDEC DO-204AL standard, featuring a cathode identification band and hermetically sealed construction. This package supports high-temperature operation up to +200°C and is mechanically robust for through-hole assembly - a key differentiator from plastic-packaged alternatives like the MMSZ5254ET1G when selecting the BZX85C27.
What is the maximum power dissipation rating for the BZX85C27?
The BZX85C27 is rated for 1.0 W power dissipation at ambient temperature (TA) of 25°C. Above 50°C, it must be derated linearly at 6.67 mW/°C. This 1.0 W rating distinguishes the BZX85C27 from lower-power Zeners such as the 1N5254B (0.5 W), making it suitable for higher-energy clamping and regulation tasks where thermal margin is critical.
How does the leakage current of the BZX85C27 compare to similar Zener diodes?
The BZX85C27 exhibits ≤0.25 μA leakage current at 20.3 V reverse voltage (VR), which is significantly lower than earlier-generation Zeners in the same voltage range. This low leakage directly improves accuracy in high-impedance reference dividers and extends battery life in always-on monitoring circuits where the BZX85C27 serves as a voltage supervisor element.
Is the BZX85C27 suitable for automotive under-hood applications?
Yes, the BZX85C27 is qualified for automotive under-hood use due to its –65°C to +200°C operating and storage temperature range, glass-passivated junction, and DO-41 hermetic package. These characteristics enable reliable operation in engine control modules and transmission controllers where the BZX85C27 provides voltage reference or transient suppression without thermal or humidity-induced failure.
BZX85C27 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±7%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 19 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
BZX85C27 FAQ
1.How can I place an order for BZX85C27 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C27 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BZX85C27 reliable?
The price and inventory of BZX85C27 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C27 is usually 5 days.
3.What payment methods are accepted for BZX85C27?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C27 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C27?
BZX85C27 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C27 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BZX85C27?
For technical support, including BZX85C27 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C27 requirements.
6.How does Aetrix verify that BZX85C27 is sourced from the original manufacturer or authorized distributors?
All BZX85C27 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZX85C27 meets industry standards.
7.What is the process for return or replacement of BZX85C27?
All BZX85C27 units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C27, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BZX85C27 part is unused and in its original packaging.
Return procedure for BZX85C27:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C27 Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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SMAZ12-13-F
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