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onsemi BZX79C56_T50A
- Part No.:
- BZX79C56_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C56_T50A.pdf
- Description:
- DIODE ZENER 56V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:6,771
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Product details
Overview
BZX79C56_T50A from ON Semiconductor is a 56 V, ±5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 200 Ω dynamic impedance at 2 mA test current, and 0.05 μA maximum leakage current at 47 V reverse voltage. It provides precise voltage regulation in low-power reference and protection circuits.
For engineers reviewing the BZX79C56_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal derating behavior (4.0 mW/°C above 75°C), junction temperature range (–65°C to +200°C), and DO-35 mechanical compatibility in space-constrained analog designs.
Technical Context
This discrete Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. Its 56 V nominal zener voltage is specified at 2 mA test current, with 200 Ω dynamic impedance indicating moderate regulation stiffness and predictable voltage shift over current variation.
The device features a negative temperature coefficient of –2.0 mV/°C, meaning its zener voltage decreases slightly as temperature rises - a critical factor when designing temperature-stable references. Its 0.05 μA leakage at 47 V ensures minimal standby current in high-impedance bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 52 V min / 60 V max at IZ = 2 mA - defines usable regulation window for precision clamping |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power before thermal derating begins |
| Dynamic Impedance (ZZ) | 200 Ω max @ IZ = 2 mA - determines output voltage variation under load current changes |
| Leakage Current (IR) | 0.05 μA max @ VR = 47 V - ensures negligible current draw in off-state biasing |
| Temp Coefficient (TC) | –2.0 mV/°C - quantifies voltage drift per degree Celsius rise in junction temperature |
| Junction Temp Range | –65°C to +200°C - supports operation in automotive under-hood and industrial environments |
| Package | DO-35 glass axial - enables manual soldering, through-hole mounting, and high-reliability hermetic sealing |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no external biasing circuitry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference node | Connected to lower potential side in regulation configuration; forms reference ground return path |
| Cathode | Zener voltage reference terminal / Breakdown anode | Marked with color band; connected to higher potential side; output voltage referenced to this node |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable clamping within 2.8 V window at 56 V nominal - suitable for non-critical reference applications |
| 500 mW power rating | Supports regulation in low-current analog stages without heatsinking or forced airflow |
| DO-35 glass package | Provides hermetic seal and long-term stability under thermal cycling and humidity exposure |
| –2.0 mV/°C tempco | Allows compensation via series thermistor or complementary diode pairing in precision references |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Providing stable 56 V reference to set common-mode voltage in high-side current sensing amplifiers. IC Role / Device Role / Timing Role: Zener diode acts as passive voltage reference node, defining amplifier input offset point. Use Value: Enables accurate differential measurement up to 56 V rail without active regulator overhead or quiescent current penalty. | Use Scenario: Protecting ADC input pins from transient surges exceeding 56 V in industrial 4–20 mA loop receivers. IC Role / Device Role / Timing Role: Clamping element shunting excess energy to ground during ESD or inductive kick events. Use Value: Limits peak voltage to 60 V (max) while drawing <0.05 μA leakage - preserving signal integrity and minimizing loading. |
| Low-Power Power Supply Regulation | Microcontroller Reset Threshold Setting |
Use Scenario: Regulating auxiliary 56 V rail for isolated gate drivers in low-duty-cycle motor control stages. IC Role / Device Role / Timing Role: Passive shunt regulator maintaining constant voltage despite input ripple or load transients. Use Value: Delivers stable 52–60 V output with <200 Ω impedance - sufficient for gate driver bias without switching noise coupling. | Use Scenario: Setting brown-out detection threshold at 56 V for high-voltage MCU supervisory circuits. IC Role / Device Role / Timing Role: Zener-based comparator reference enabling reset assertion when main supply drops below 52 V. Use Value: Provides deterministic 56 V trigger point with ±5% tolerance - compatible with standard reset IC hysteresis windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5256B | Same 56 V nominal, ±5% tolerance, but rated 500 mW in DO-35; TC = –2.0 mV/°C identical | No functional difference; identical thermal and electrical specs - direct substitution possible | Select when sourcing from legacy distributors or where Fairchild/ON branding is not required |
| BZX55C56 | 56 V, ±5%, 500 mW, DO-35, but TC = –2.5 mV/°C and ZZ = 220 Ω max - slightly higher impedance and drift | Acceptable for less sensitive clamping; not recommended for precision references requiring tight TC match | Choose only if BZX79C56_T50A is unavailable and thermal drift budget allows ±0.5 mV/°C increase |
Compared with 1N5256B and BZX55C56, the BZX79C56_T50A offers identical zener voltage and temperature coefficient to the former, while providing tighter dynamic impedance control than the latter - making it preferred for applications demanding consistent regulation stiffness across temperature.
Availability
BZX79C56_T50A is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection, low-power regulation, and microcontroller reset circuitry requiring stable component supply and long-lifecycle support.
Supply support for BZX79C56_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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic devices for automotive, industrial, and consumer applications.
The BZX79C series was designed for general-purpose voltage regulation and transient suppression in cost-sensitive, space-constrained analog circuits - emphasizing reliability, wide temperature operation, and DO-35 manufacturability.
FAQ
What is the zener voltage tolerance for BZX79C56_T50A?
The BZX79C56_T50A has a zener voltage tolerance of ±5%, resulting in a guaranteed regulation range of 52 V to 60 V at 2 mA test current. This tolerance is measured under thermal equilibrium conditions at lead temperature of 30°C ± 1°C with 3/8" lead length. The specification ensures predictable clamping performance in production-grade analog circuits without requiring binning or post-assembly calibration.
Does BZX79C56_T50A require a current-limiting resistor in series?
Yes, BZX79C56_T50A requires an external series current-limiting resistor to restrict reverse current to within its 500 mW power rating and prevent thermal runaway. For example, at 60 V input and 56 V output, a 1 kΩ resistor limits current to ~4 mA - well within safe operating area. The resistor value must be selected based on worst-case input voltage, desired zener current, and ambient thermal conditions to ensure junction temperature remains below +200°C.
What is the maximum leakage current specification for BZX79C56_T50A?
The maximum leakage current for BZX79C56_T50A is 0.05 μA at 47 V reverse voltage and TA = 25°C. This ultra-low leakage ensures minimal loading on high-impedance nodes such as op-amp bias networks or precision voltage dividers. It reflects the device's suitability for battery-powered or low-quiescent-current applications where standby power loss must be minimized without compromising regulation accuracy.
Can BZX79C56_T50A be used in surface-mount designs?
No, BZX79C56_T50A is packaged in DO-35 glass axial format and is not a surface-mount device. It requires through-hole mounting with 3/8" lead length for proper thermal dissipation. For SMT alternatives, consider ON Semiconductor's NZ9F56ST5G (SOD-923, 56 V, 250 mW) or similar Zener families - but note differences in power rating, impedance, and thermal behavior that may affect circuit performance.
What is the temperature coefficient of BZX79C56_T50A and how does it affect circuit design?
The temperature coefficient of BZX79C56_T50A is –2.0 mV/°C, meaning its zener voltage decreases by approximately 2 mV for every 1°C rise in junction temperature. This negative drift must be accounted for in precision reference designs - for instance, by pairing with a forward-biased diode or using temperature-compensated topologies. In non-critical clamping applications, the effect remains within acceptable bounds across the full –65°C to +200°C operating range.
BZX79C56_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 39.2 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
BZX79C56_T50A FAQ
1.How can I place an order for BZX79C56_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C56_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 BZX79C56_T50A reliable?
The price and inventory of BZX79C56_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C56_T50A is usually 5 days.
3.What payment methods are accepted for BZX79C56_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C56_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C56_T50A?
BZX79C56_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C56_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 BZX79C56_T50A?
For technical support, including BZX79C56_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C56_T50A requirements.
6.How does Aetrix verify that BZX79C56_T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C56_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 BZX79C56_T50A meets industry standards.
7.What is the process for return or replacement of BZX79C56_T50A?
All BZX79C56_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C56_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 BZX79C56_T50A part is unused and in its original packaging.
Return procedure for BZX79C56_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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