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onsemi BZX79C51-T50A-ON
- Part No.:
- BZX79C51-T50A-ON
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C51-T50A-ON.pdf
- Description:
- DIODE ZENER 51V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:80,000
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Product details
Overview
BZX79C51-T50A-ON from onsemi is a 51 V ±5% tolerance, 500 mW axial-leaded Zener diode in DO-204AH (Case 017AG) glass package, rated for 5 mA test current, 60 Ω dynamic impedance, and −2.7 mV/°C temperature coefficient - used for precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the BZX79C51-T50A-ON datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance at 5 mA, thermal derating above 75°C, junction temperature range (−65°C to +200°C), and DO-204AH mechanical compatibility with through-hole PCB layouts.
Technical Context
The BZX79C51-T50A-ON operates as a silicon planar Zener diode optimized for stable reverse-bias breakdown at 51 V with tight ±5% initial tolerance. Its −2.7 mV/°C temperature coefficient ensures predictable drift across industrial temperature ranges.
Designed for DC voltage reference and clamping, it delivers 60 Ω dynamic impedance at IZ = 5 mA and supports up to 500 mW power dissipation at TL ≤ 75°C, derating linearly at 4.0 mW/°C above that point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48.5 V to 53.5 V at IZ = 5 mA - defines regulated output range under nominal bias |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous thermal load in lead-sink conditions |
| Dynamic Impedance (ZZ) | 60 Ω max @ IZ = 5 mA - determines regulation stiffness against load current variation |
| Temperature Coefficient (TC) | −2.7 mV/°C - quantifies voltage drift per degree Celsius change in junction temperature |
| Junction Temp Range (TJ) | −65°C to +200°C - enables operation in harsh environments including automotive under-hood and industrial controls |
| Leakage Current (IR) | 0.05 μA max @ VR = 38.3 V - ensures minimal error current in high-impedance reference nodes |
Pinout & Package
DO-204AH (Case 017AG) axial-leaded hermetically sealed glass package, 4.56 mm body length × 1.91 mm diameter, 3/8″ lead length standard, weight 0.137 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward conduction terminal / cathode reference ground node in shunt regulator | Connected to circuit ground when used in standard shunt configuration; carries forward current up to 200 mA |
| Cathode (K) | Zener breakdown terminal / regulated voltage output node | Connected to input supply via series resistor; maintains stable 51 V relative to anode during reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables accurate voltage setting without post-assembly trimming in cost-sensitive analog references |
| Hermetically sealed glass package | Provides long-term stability and moisture resistance for reliability-critical applications |
| Low leakage current (≤0.05 μA) | Minimizes loading error in high-impedance sensor biasing and precision comparator reference paths |
| Controlled temperature coefficient | −2.7 mV/°C allows predictable compensation in temperature-varying systems |
Applications
| Industrial Sensor Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 51 V reference for 16-bit ADC front-end biasing in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Shunt voltage reference diode regulating excitation voltage for bridge sensors and op-amp gain stages. Use Value: Tight ±5% tolerance and low TC ensure <0.1% full-scale error drift over −40°C to +85°C operating range. | Use Scenario: Protecting microcontroller I/O pins from transient surges on 48 V DC fieldbus lines in factory automation equipment. IC Role / Device Role / Timing Role: Reverse-biased clamping device limiting voltage to 53.5 V peak during ESD or inductive kick events. Use Value: 500 mW power rating and fast response enable absorption of 100 ns–1 μs transients without degradation. |
| Power Supply Feedback | Calibration Standard |
Use Scenario: Setting feedback threshold in isolated flyback converter secondary-side regulation using TL431-compatible topology. IC Role / Device Role / Timing Role: Precision Zener element establishing 51 V reference for optocoupler-driven error amplifier loop. Use Value: 60 Ω ZZ ensures minimal loop gain variation across line/load changes, improving regulation accuracy to ±1.5%. | Use Scenario: Serving as traceable voltage standard in handheld multimeter calibration fixtures for 50 V range verification. IC Role / Device Role / Timing Role: Stable, low-drift passive reference source replacing battery-powered references in portable test gear. Use Value: Hermetic glass construction and −65°C to +200°C TJ support repeatable measurements across environmental chambers and field service conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5257B-TAP | 51 V ±5%, 500 mW, DO-35 package, ZZ = 70 Ω max @ 5 mA, TC = −2.5 mV/°C | Slightly higher dynamic impedance; same voltage grade but different mechanical footprint | Preferred where DO-35 mounting or legacy footprint compatibility is required |
| BZX55C51-TR | 51 V ±5%, 500 mW, DO-35 package, ZZ = 65 Ω max @ 5 mA, TC = −2.7 mV/°C, 1000 pcs/reel packaging | Identical electrical specs but different package outline and tape-and-reel delivery | Selected for automated SMT-compatible assembly with manual rework capability |
Compared with BZX79C51-T50A-ON, the 1N5257B-TAP offers similar regulation performance but requires PCB layout adaptation due to DO-35 dimensions, while BZX55C51-TR matches electrical behavior exactly but uses tape-and-reel packaging and DO-35 mechanical form - neither is pin-compatible, but both serve as functional alternatives in new designs where package constraints allow.
Availability
BZX79C51-T50A-ON is available at Aetrix Electronics and suitable for industrial sensor reference, overvoltage clamp, and power supply feedback applications requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.
Supply support for BZX79C51-T50A-ON 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX79C series is part of onsemi's legacy Zener diode portfolio designed specifically for general-purpose voltage regulation, reference, and protection in cost-sensitive, high-reliability through-hole applications.
FAQ
What is the Zener voltage tolerance of the BZX79C51-T50A-ON?
The BZX79C51-T50A-ON has a Zener voltage tolerance of ±5% at IZ = 5 mA, resulting in a guaranteed breakdown range of 48.5 V to 53.5 V. This tolerance is specified per the onsemi datasheet Rev. 5 (December 2023) and applies under thermal equilibrium conditions at lead temperature of 30°C ±1°C. The BZX79C51-T50A-ON maintains this specification across its qualified operating temperature range.
Does the BZX79C51-T50A-ON have a specified forward voltage?
Yes, the BZX79C51-T50A-ON has a maximum forward voltage (VF) of 1.2 V at forward current (IF) = 200 mA, as stated in the Absolute Maximum Ratings section of the onsemi datasheet. This parameter is relevant when the device is used in forward-conduction mode, such as in polarity protection or dual-function circuits, though its primary function remains reverse-bias Zener regulation.
What is the package type and mechanical outline for BZX79C51-T50A-ON?
The BZX79C51-T50A-ON uses the DO-204AH axial-leaded package, also designated Case 017AG by onsemi. It features a hermetically sealed glass body measuring 4.56 mm in length and 1.91 mm in diameter, with 3/8″ (9.5 mm) lead length. The "T50A" suffix indicates fan-fold tape packaging with 5000 units per reel, compatible with manual and semi-automated through-hole insertion.
How does temperature affect the Zener voltage of BZX79C51-T50A-ON?
The BZX79C51-T50A-ON exhibits a temperature coefficient (TC) of −2.7 mV/°C, meaning its Zener voltage decreases by approximately 2.7 mV for every 1°C rise in junction temperature. This negative TC is typical for Zeners above ~5.6 V and must be accounted for in precision reference designs operating across wide ambient ranges. The BZX79C51-T50A-ON's TC is measured and specified per JEDEC test conditions in the onsemi datasheet.
Can BZX79C51-T50A-ON be used in surface-mount applications?
No, the BZX79C51-T50A-ON is not suitable for surface-mount applications because it uses an axial-leaded DO-204AH package designed exclusively for through-hole mounting. Its leads require hole placement and soldering on opposite sides of the PCB. For SMT equivalents, engineers should consider devices like BZX55C51-TR (DO-35) or MMBZ5257BS (SOD-123), but those are not drop-in replacements for the BZX79C51-T50A-ON.
BZX79C51-T50A-ON Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX79C51-T50A-ON FAQ
1.How can I place an order for BZX79C51-T50A-ON through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C51-T50A-ON 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 BZX79C51-T50A-ON reliable?
The price and inventory of BZX79C51-T50A-ON are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C51-T50A-ON is usually 5 days.
3.What payment methods are accepted for BZX79C51-T50A-ON?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C51-T50A-ON transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C51-T50A-ON?
BZX79C51-T50A-ON orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C51-T50A-ON 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 BZX79C51-T50A-ON?
For technical support, including BZX79C51-T50A-ON datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C51-T50A-ON requirements.
6.How does Aetrix verify that BZX79C51-T50A-ON is sourced from the original manufacturer or authorized distributors?
All BZX79C51-T50A-ON 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 BZX79C51-T50A-ON meets industry standards.
7.What is the process for return or replacement of BZX79C51-T50A-ON?
All BZX79C51-T50A-ON units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C51-T50A-ON, 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 BZX79C51-T50A-ON part is unused and in its original packaging.
Return procedure for BZX79C51-T50A-ON:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C51-T50A-ON Tags
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