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onsemi BZX85C27_T50R
- Part No.:
- BZX85C27_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C27_T50R.pdf
- Description:
- DIODE ZENER 27V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:5,025
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Product details
Overview
BZX85C27_T50R from ON Semiconductor is a 27 V ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, with zener impedance of 8 Ω at 30 mA test current and leakage current ≤0.25 μA at 20.8 V reverse voltage, used for precision voltage regulation and overvoltage protection in power supply feedback loops.
For engineers reviewing the BZX85C27_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, power derating above 50°C (6.67 mW/°C), thermal resistance (junction-to-lead), cathode band marking, and DO-41 mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates as a two-terminal silicon junction diode optimized for stable reverse-breakdown behavior. It maintains regulated output voltage across a wide range of reverse currents (IZ = 1–30 mA) while exhibiting low dynamic impedance (ZZ = 8 Ω) and tight voltage tolerance (±5%) at nominal test conditions.
The BZX85C27_T50R is rated for operation from –65°C to +200°C and features a glass-passivated DO-41 package with cathode identification via color band. Its forward voltage is ≤1.2 V at 200 mA, supporting bidirectional circuit verification during functional testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.1 V min / 28.9 V max at IZ = 30 mA - defines regulated output range under standard test conditions |
| Power Dissipation (PD) | 1.0 W @ TA = 25°C - sets maximum continuous power handling at ambient temperature |
| Zener Impedance (ZZ) | 8 Ω @ IZ = 30 mA - determines regulation stiffness and output voltage variation under load changes |
| Leakage Current (IR) | ≤0.25 μA @ VR = 20.8 V - ensures minimal standby current in high-impedance bias networks |
| Tolerance | ±5% - specifies allowable deviation from nominal 27 V rating for production binning and design margining |
| Package | DO-41 glass case - provides hermetic sealing, axial lead form factor, and JEDEC-standard mechanical footprint |
| Thermal Derating | 6.67 mW/°C above 50°C - enables safe power reduction in elevated ambient environments without thermal runaway |
Pinout & Package
DO-41 glass axial package with cathode identified by a single color band on the body. Leads are tinned copper-clad steel, suitable for wave or hand soldering. Package conforms to JEDEC DO-204AL standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node in regulation circuit; reverse-biased during normal Zener operation |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with color band; connected to regulated voltage rail; supplies stable reference when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables tighter regulation margins in feedback networks without external trimming components |
| Low zener impedance (8 Ω) | Minimizes output voltage shift under varying load currents in shunt regulator topologies |
| Hermetically sealed glass DO-41 | Ensures long-term stability and moisture resistance in industrial and automotive environments |
| Wide operating temperature range | Supports reliable operation from –65°C to +200°C in harsh thermal environments |
| Low leakage current (≤0.25 μA) | Reduces error contribution in high-impedance voltage divider or reference bias circuits |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting upper threshold for TL431 or optocoupler LED drive current. Use Value: Tight 27 V tolerance ensures accurate secondary-side voltage sensing and minimizes output drift across line/load/temperature. |
Use Scenario: Clamping transient surges on 24 V DC bus lines in industrial control systems. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground before downstream ICs exceed absolute maximum ratings. Use Value: 1.0 W power rating and low ZZ allow rapid clamping response with minimal voltage overshoot during ESD or inductive kick events. |
| Voltage Reference for Analog Circuits | Microcontroller Reset Circuit |
Use Scenario: Providing stable 27 V reference for ADC input scaling or DAC output calibration in test equipment. IC Role / Device Role / Timing Role: Precision shunt reference establishing known voltage node for ratiometric measurements. Use Value: Low leakage (≤0.25 μA) prevents loading errors in high-impedance sensor interface paths and improves measurement repeatability. |
Use Scenario: Generating clean reset signal for microcontrollers powered from unregulated 28 V supply rails. IC Role / Device Role / Timing Role: Threshold detector triggering POR (power-on reset) when supply crosses 27 V ±5% window. Use Value: Sharp knee and stable VZ enable predictable reset assertion timing without hysteresis circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5254B | 27 V ±5%, 0.5 W, DO-35 package, ZZ = 35 Ω @ 20 mA | Lower power rating and higher impedance limit use in high-current or precision regulation | Select when space-constrained designs require smaller DO-35 footprint and thermal load is ≤0.5 W |
| MMSZ5254B | 27 V ±5%, 0.35 W, SOD-123 surface-mount, ZZ = 35 Ω @ 20 mA | SMT-only format and reduced power dissipation restrict suitability to low-power signal-level clamping | Choose for automated assembly and board area savings where 27 V reference is needed in signal-path protection only |
Compared with BZX85C27_T50R, the 1N5254B offers identical voltage rating but lower power and higher impedance, while MMSZ5254B trades package size and assembly method for reduced thermal capability-both require layout and thermal redesign if replacing BZX85C27_T50R in 1 W applications.
Availability
BZX85C27_T50R is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, analog voltage references, and microcontroller reset networks requiring stable component supply and long-lifecycle support.
Supply support for BZX85C27_T50R 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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensors, and discrete devices for automotive, industrial, and cloud power applications.
The BZX85C series was designed for general-purpose voltage regulation and protection in cost-sensitive, high-reliability through-hole applications-emphasizing robustness, tight tolerance, and thermal stability in legacy and new industrial designs.
FAQ
What is the zener voltage range for BZX85C27_T50R?
The BZX85C27_T50R has a specified zener voltage range of 25.1 V minimum to 28.9 V maximum at a test current of 30 mA, reflecting its ±5% tolerance around the nominal 27 V rating. This range is measured under thermal equilibrium at lead temperature of 30°C ±1°C with 3/8" lead length, per ON Semiconductor's characterization methodology.
Does BZX85C27_T50R have a cathode marking?
Yes, BZX85C27_T50R uses a single color band on the glass body to denote the cathode terminal, consistent with DO-41 package standards. This marking is critical for correct polarity orientation during PCB assembly and ensures proper reverse-bias operation in regulation or clamping circuits.
What is the maximum power dissipation for BZX85C27_T50R at 75°C ambient?
At 75°C ambient, BZX85C27_T50R must be derated from its 1.0 W rating at 25°C. With a derating factor of 6.67 mW/°C above 50°C, the allowable power drops to 1.0 W − (25°C × 6.67 mW/°C) = 0.833 W. This ensures safe junction temperature operation within the –65°C to +200°C range.
Can BZX85C27_T50R be used in surface-mount designs?
No, BZX85C27_T50R is exclusively a through-hole DO-41 axial package and cannot be directly mounted on SMT pads. For surface-mount equivalents, consider the MMSZ5254B (SOD-123) or NZ9F27ST5G (SOD-923), though both differ in power rating, impedance, and thermal performance versus BZX85C27_T50R.
What is the leakage current specification for BZX85C27_T50R?
BZX85C27_T50R exhibits a maximum leakage current of 0.25 μA at 20.8 V reverse voltage (VR), measured at 25°C. This ultra-low leakage supports high-impedance bias networks and precision reference applications where parasitic current paths could otherwise introduce significant error.
BZX85C27_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- 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_T50R FAQ
1.How can I place an order for BZX85C27_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C27_T50R 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_T50R reliable?
The price and inventory of BZX85C27_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C27_T50R is usually 5 days.
3.What payment methods are accepted for BZX85C27_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C27_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C27_T50R?
BZX85C27_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C27_T50R 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_T50R?
For technical support, including BZX85C27_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C27_T50R requirements.
6.How does Aetrix verify that BZX85C27_T50R is sourced from the original manufacturer or authorized distributors?
All BZX85C27_T50R 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_T50R meets industry standards.
7.What is the process for return or replacement of BZX85C27_T50R?
All BZX85C27_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C27_T50R, 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_T50R part is unused and in its original packaging.
Return procedure for BZX85C27_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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