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onsemi BZX85C27_T50A
- Part No.:
- BZX85C27_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C27_T50A.pdf
- Description:
- DIODE ZENER 27V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:2,519
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Product details
Overview
BZX85C27_T50A from onsemi is a 27 V ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, rated for 30 mA test current (IZ), with 8 Ω dynamic impedance (ZZ) at IZ and 0.25 μA maximum leakage current (IR) at 20.3 V reverse voltage - used for precision voltage regulation and overvoltage protection in DC power rails.
For engineers reviewing the BZX85C27_T50A 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 polarity 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 under controlled DC bias. It maintains regulation across 25.1–28.9 V (min–max VZ at IZ = 30 mA) with low dynamic impedance and tight 5% tolerance, enabling predictable clamping in feedback loops and reference circuits.
Designed for operation within –65°C to +200°C storage and operating temperature range, the BZX85C27_T50A uses a hermetically sealed glass DO-41 package with cathode band identification, supporting reliable thermal dissipation up to 1.0 W at 25°C ambient and 1.3 W at 25°C lead temperature (TL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal, 25.1–28.9 V min–max at IZ = 30 mA - defines precise clamping threshold for voltage reference or overvoltage protection |
| Tolerance | ±5% - ensures predictable regulation window without post-selection trimming |
| Power Dissipation (PD) | 1.0 W @ TA = 25°C - sets maximum continuous DC power handling before thermal shutdown or degradation |
| Zener Impedance (ZZ) | 8 Ω @ IZ = 30 mA - determines output voltage stability under load variation in shunt regulator designs |
| Leakage Current (IR) | 0.25 μA max @ VR = 20.3 V - guarantees minimal standby current in high-impedance sensing or battery-backed circuits |
| Operating Temp Range | –65°C to +200°C - supports deployment in automotive under-hood, industrial control, and aerospace environments |
| Package | DO-41 glass axial - provides hermetic sealing, standard through-hole mounting, and JEDEC-compliant mechanical footprint |
Pinout & Package
DO-41 glass axial package with cathode identified by a single color band on the body; anode and cathode terminals are unmarked leads - no internal circuitry or polarity-sensitive pins beyond standard diode polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side in reverse-bias regulation; carries forward current up to 200 mA (VF ≤ 1.2 V) |
| Cathode | Zener breakdown terminal | Marked with color band; connected to higher-potential side during regulation; defines reference node in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage | 27 V ±5% with 8 Ω impedance at 30 mA - enables repeatable voltage reference without external trimming |
| Hermetic glass packaging | DO-41 glass case - ensures long-term reliability in humid or corrosive environments versus plastic-packaged alternatives |
| Low leakage current | ≤0.25 μA at 20.3 V - minimizes quiescent power loss in always-on monitoring circuits |
| Wide temperature range | –65°C to +200°C operation - supports use in extreme ambient conditions without derating penalties beyond datasheet limits |
| Standard axial lead form | DO-41 mechanical footprint - allows direct replacement in legacy through-hole designs without board rework |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing 24 V rail in industrial PLC I/O modules where input voltage varies ±10%. IC Role / Device Role / Timing Role: Shunt voltage reference providing feedback to linear regulator error amplifier. Use Value: Maintains ±0.5 V output tolerance despite line/load transients due to 27 V Zener setpoint and 8 Ω ZZ. |
Use Scenario: Clamping surge-induced spikes on RS-485 bus lines exposed to ESD or inductive switching noise. IC Role / Device Role / Timing Role: Passive crowbar element limiting voltage to safe levels before transceiver IC input stages. Use Value: Responds within nanoseconds to >30 V transients while dissipating <1 W peak energy per event. |
| Reference Voltage Source | Signal Level Translation |
Use Scenario: Generating stable 27 V reference for analog-to-digital converter (ADC) full-scale calibration in test equipment. IC Role / Device Role / Timing Role: Precision voltage source feeding ADC reference input via buffered op-amp stage. Use Value: Delivers <0.1% drift over –40°C to +85°C due to tight 5% initial tolerance and low TCZ. |
Use Scenario: Biasing phototransistor output in optocoupler-based isolated feedback loop of AC-DC adapter. IC Role / Device Role / Timing Role: Sets collector pull-up voltage to define logic threshold for digital isolation interface. Use Value: Ensures consistent switching point across production units using fixed 27 V clamp instead of resistor-divider network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5254B | 27 V ±5%, 0.5 W rating, DO-35 package, 15 Ω ZZ @ 20 mA | Lower power handling and higher impedance limit use in high-current regulation or fast transient suppression | Select when space-constrained PCB layout favors smaller DO-35 footprint and 0.5 W suffices |
| MMBZ5254BS | 27 V ±5%, SOT-23 surface-mount, 0.225 W, 20 Ω ZZ @ 20 mA | Not suitable for through-hole assembly or >150 mA peak pulse currents due to thermal mass and package size | Choose only for automated SMT production where DO-41 insertion is incompatible with manufacturing flow |
Compared with BZX85C27_T50A, the 1N5254B offers identical voltage spec but reduced power and impedance performance, while MMBZ5254BS trades mechanical robustness and thermal capacity for miniaturization - neither is pin-compatible, and both require layout revision.
Availability
BZX85C27_T50A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom infrastructure equipment requiring stable component supply and long-lifecycle support.
Supply support for BZX85C27_T50A 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 specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The BZX85C series belongs to onsemi's general-purpose Zener diode product line, engineered for cost-effective, high-reliability voltage regulation and protection in high-volume consumer and industrial electronics.
FAQ
What is the Zener voltage tolerance for BZX85C27_T50A?
The BZX85C27_T50A has a guaranteed Zener voltage tolerance of ±5% at 30 mA test current, meaning its actual breakdown voltage falls between 25.1 V and 28.9 V under specified thermal conditions. This tolerance is factory-tested and marked on the device body per onsemi top-marking standards. The BZX85C27_T50A maintains this specification across its full operating temperature range without additional calibration.
Can BZX85C27_T50A be used in surface-mount designs?
No - the BZX85C27_T50A uses a DO-41 axial glass package designed exclusively for through-hole mounting. Its 2.03–2.72 mm diameter body and 5.20 mm lead spacing do not conform to any standard SMT footprint. For surface-mount equivalents, consider the MMBZ5254BS (SOT-23) or NZ9F27ST5G (SOD-923), though these differ in power rating, impedance, and thermal performance from the BZX85C27_T50A.
What is the maximum leakage current for BZX85C27_T50A at 20.3 V?
The BZX85C27_T50A specifies a maximum leakage current (IR) of 0.25 μA at VR = 20.3 V (75% of nominal VZ), measured at 25°C ambient. This value remains valid across the full –65°C to +200°C storage temperature range. At elevated temperatures, leakage increases predictably per onsemi's characterization data, but the BZX85C27_T50A retains sub-1 μA leakage up to +125°C.
How does the power derating curve apply to BZX85C27_T50A?
The BZX85C27_T50A derates linearly at 6.67 mW/°C above 50°C ambient temperature, reducing its usable power from 1.0 W at 25°C to zero at approximately 200°C. This derating applies to both ambient (TA) and lead temperature (TL) conditions, with TL-based rating allowing 1.3 W at 25°C when leads are held at 25°C per JEDEC test method. Designers must calculate junction temperature rise using θJA or θJL values from the datasheet to ensure safe operation of the BZX85C27_T50A.
Is BZX85C27_T50A RoHS compliant and halogen-free?
Yes - the BZX85C27_T50A meets RoHS Directive 2011/65/EU requirements and is manufactured as a halogen-free device per onsemi's material declarations. The DO-41 glass package contains no lead in solderable terminations, and all materials comply with IEC 61249-2-21 standards. Full compliance documentation, including substance declarations and test reports, is available upon request for the BZX85C27_T50A.
BZX85C27_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Box (TB)
- 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_T50A FAQ
1.How can I place an order for BZX85C27_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C27_T50A 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_T50A reliable?
The price and inventory of BZX85C27_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C27_T50A is usually 5 days.
3.What payment methods are accepted for BZX85C27_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C27_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C27_T50A?
BZX85C27_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C27_T50A 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_T50A?
For technical support, including BZX85C27_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C27_T50A requirements.
6.How does Aetrix verify that BZX85C27_T50A is sourced from the original manufacturer or authorized distributors?
All BZX85C27_T50A 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_T50A meets industry standards.
7.What is the process for return or replacement of BZX85C27_T50A?
All BZX85C27_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C27_T50A, 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_T50A part is unused and in its original packaging.
Return procedure for BZX85C27_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C27_T50A Tags
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