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onsemi BZX85C51_T50R
- Part No.:
- BZX85C51_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C51_T50R.pdf
- Description:
- DIODE ZENER 51V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:2,255
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Product details
Overview
BZX85C51_T50R from onsemi is a 51 V ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, with zener impedance of 4 Ω at 115 mA test current and leakage current ≤0.25 μA at 36 V reverse voltage, used for precision voltage regulation and overvoltage protection in power supply feedback loops.
For engineers reviewing the BZX85C51_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 identification, and compliance with JEDEC DO-204AL mechanical standards.
Technical Context
This device operates as a silicon planar passivated Zener diode optimized for stable voltage reference and shunt regulation. It maintains specified VZ across 1 mA to 115 mA test current range, with low dynamic impedance (4 Ω) ensuring minimal output voltage variation under load transients.
The DO-41 glass package provides hermetic sealing and thermal stability up to +200°C junction temperature. Its axial lead configuration supports through-hole mounting and manual soldering, with cathode identified by a single color band near the lead end.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48 V min / 54 V max at IZ = 115 mA - defines regulated output voltage window under nominal bias |
| Power Dissipation (PD) | 1.0 W @ TA = 25°C - maximum continuous power handling before thermal shutdown or degradation |
| Zener Impedance (ZZ) | 4 Ω @ IZ = 115 mA - low dynamic resistance ensures tight regulation during current fluctuations |
| Leakage Current (IR) | ≤0.25 μA @ VR = 36 V - negligible reverse conduction below knee voltage, critical for standby power integrity |
| Operating Temperature | −65°C to +200°C - wide thermal range enables use in automotive engine compartments and industrial controls |
| Forward Voltage (VF) | 1.2 V max @ IF = 200 mA - forward conduction threshold for polarity-sensitive circuit protection |
Pinout & Package
DO-41 glass axial package with cathode identified by a single color band on the body; leads are tinned copper, suitable for wave or hand soldering per J-STD-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to lower potential node in shunt regulation | Accepts current flow toward cathode when reverse-biased; must be routed to ground or return path in regulator circuits |
| Cathode | Negative terminal in forward bias; marked by color band; higher potential node in shunt regulation | Connected to regulated voltage node; clamps excess voltage by conducting to anode when VIN exceeds VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Ensures predictable regulation without post-manufacture trimming; reduces binning complexity in high-volume power supplies |
| Low zener impedance (4 Ω) | Minimizes output voltage deviation under dynamic load changes, improving transient response in feedback networks |
| Hermetically sealed glass package | Prevents moisture ingress and parameter drift over time, supporting long-term reliability in harsh environments |
| JEDEC DO-204AL compliant | Guarantees mechanical interchangeability with legacy DO-41 footprints and automated assembly tooling |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt reference providing precise 51 V threshold to TL431 or optocoupler input. Use Value: Maintains ±1% output accuracy across line/load/temperature with no external calibration required. |
Use Scenario: Protects microcontroller I/O pins from ESD or surge-induced voltage spikes exceeding 36 V. IC Role / Device Role / Timing Role: Fast-acting clamp diverting transient energy to ground before damage occurs. Use Value: Limits peak voltage to 54 V with <0.25 μA leakage, preserving signal integrity during normal operation. |
| Industrial Sensor Excitation | Reference Voltage Source |
Use Scenario: Supplies stable excitation voltage to 4–20 mA current-loop pressure transducers. IC Role / Device Role / Timing Role: Precision shunt regulator maintaining constant voltage across bridge sensors. Use Value: Delivers 51 V ±5% with <4 Ω impedance, reducing measurement error from supply ripple. |
Use Scenario: Generates fixed reference for analog-to-digital converter (ADC) input scaling in data acquisition systems. IC Role / Device Role / Timing Role: Low-drift voltage source replacing more expensive IC references where 5% tolerance is acceptable. Use Value: Enables cost-effective 12-bit ADC calibration with thermal coefficient dominated by package, not die. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5359B | 51 V ±5%, 5 W rating, DO-201AD package, ZZ = 1 Ω @ 115 mA | Higher power handling supports >100 mA continuous clamp current; larger footprint requires PCB redesign | Select when sustained overvoltage events demand >1 W dissipation without thermal runaway |
| BZX85C51-TR | Identical electrical specs, but in tape-and-reel packaging (no suffix _T50R); same DO-41 package | No functional difference; intended for automated SMT placement rather than manual/hand-soldered assembly | Choose BZX85C51_T50R for prototyping or low-volume through-hole builds; BZX85C51-TR for high-volume reel-fed production |
Compared with 1N5359B and BZX85C51-TR, the BZX85C51_T50R offers optimal balance of cost, size, and thermal performance for mid-power (<1 W) regulation tasks where DO-41 compatibility and lead-free hand-soldering are prioritized.
Availability
BZX85C51_T50R is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor excitation requiring stable component supply with full traceability and lifecycle management.
Supply support for BZX85C51_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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX85C51_T50R belongs to the BZX85C series of general-purpose Zener diodes designed for cost-sensitive, high-reliability voltage regulation in power conversion and protection applications.
FAQ
What is the zener voltage tolerance for BZX85C51_T50R?
The BZX85C51_T50R has a zener voltage tolerance of ±5%, meaning its rated breakdown voltage falls between 48 V and 54 V when tested at 115 mA. This tolerance is guaranteed across the full operating temperature range and is verified during final test screening per onsemi's quality standards. The BZX85C51_T50R achieves this consistency using planar passivation and controlled diffusion processes.
Can BZX85C51_T50R be used in surface-mount designs?
No, the BZX85C51_T50R uses a DO-41 axial glass package with 0.4–0.6 mm diameter leads, designed exclusively for through-hole mounting. It is not compatible with standard SMT reflow profiles or pick-and-place equipment. For surface-mount equivalents, consider the MMBZ5255BL (SOT-23, 51 V) or BZX84-C51 (SOT-23), which share similar electrical characteristics but require different layout and assembly processes.
What is the maximum reverse leakage current for BZX85C51_T50R?
The BZX85C51_T50R specifies a maximum reverse leakage current of 0.25 μA at VR = 36 V (70% of nominal VZ). This ultra-low leakage ensures minimal quiescent current draw in battery-powered or energy-harvesting applications. Measured at 25°C ambient, leakage remains below 1 μA up to 125°C junction temperature per onsemi's characterization data.
How does thermal derating apply to BZX85C51_T50R?
The BZX85C51_T50R must be derated linearly above 50°C ambient temperature at 6.67 mW/°C, reducing its maximum allowable power dissipation from 1.0 W at 25°C to zero at approximately 200°C. This derating reflects junction-to-ambient thermal resistance and ensures safe operation within the −65°C to +200°C storage and operating range. Derating applies regardless of mounting method or heatsinking.
Is BZX85C51_T50R RoHS compliant and lead-free?
Yes, the BZX85C51_T50R is RoHS compliant and manufactured with lead-free terminations per EU Directive 2011/65/EU and onsemi's Pb-Free Packaging Standard. The DO-41 glass body contains no restricted substances above threshold limits, and the tinned copper leads meet J-STD-020 moisture sensitivity level (MSL) 1 requirements for unlimited floor life at ≤30°C/60% RH.
BZX85C51_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):
- 51 V
- Tolerance:
- ±6%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 115 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 36 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
BZX85C51_T50R FAQ
1.How can I place an order for BZX85C51_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C51_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 BZX85C51_T50R reliable?
The price and inventory of BZX85C51_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C51_T50R is usually 5 days.
3.What payment methods are accepted for BZX85C51_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C51_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C51_T50R?
BZX85C51_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C51_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 BZX85C51_T50R?
For technical support, including BZX85C51_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C51_T50R requirements.
6.How does Aetrix verify that BZX85C51_T50R is sourced from the original manufacturer or authorized distributors?
All BZX85C51_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 BZX85C51_T50R meets industry standards.
7.What is the process for return or replacement of BZX85C51_T50R?
All BZX85C51_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C51_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 BZX85C51_T50R part is unused and in its original packaging.
Return procedure for BZX85C51_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C51_T50R Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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Diodes Incorporated
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