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onsemi BZX79C56_T50R
- Part No.:
- BZX79C56_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C56_T50R.pdf
- Description:
- DIODE ZENER 56V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,667
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Product details
Overview
BZX79C56_T50R 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_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal derating behavior, junction capacitance (18 pF at 0 V), temperature coefficient (+2.5 mV/°C), and DO-35 mechanical compatibility in space-constrained analog designs.
Technical Context
The BZX79C56_T50R operates as a silicon planar Zener diode optimized for stable voltage reference and overvoltage clamping. Its 56 V nominal breakdown voltage is specified at 2 mA test current, with ±5% tolerance and +2.5 mV/°C positive temperature coefficient ensuring predictable drift across industrial temperature ranges.
It exhibits 200 Ω dynamic impedance (ZZ) at IZ = 2 mA, 18 pF junction capacitance measured at 0 V and 1 MHz, and 0.05 μA maximum leakage current at VR = 47 V - characteristics critical for low-noise biasing and transient suppression in analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 52 V to 60 V at IZ = 2 mA - defines usable regulation window for precision reference design |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling before thermal derating begins |
| Dynamic Impedance (ZZ) | 200 Ω max @ IZ = 2 mA - determines output voltage stability under load variation |
| Junction Capacitance (C) | 18 pF @ VZ = 0 V, f = 1 MHz - impacts high-frequency noise filtering and AC response |
| Leakage Current (IR) | 0.05 μA max @ VR = 47 V - ensures minimal standby current in battery-powered circuits |
| Temp. Coefficient (TC) | +2.5 mV/°C - enables predictable voltage drift compensation in temperature-varying environments |
| Forward Voltage (VF) | 1.5 V max @ IF = 100 mA - supports use as general-purpose rectifier in low-current paths |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB layout beyond standard diode polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connects to lower-potential node during regulation or rectification |
| Cathode | Current exit terminal in forward bias; Zener breakdown terminal in reverse bias | Connected to regulated voltage rail; marked by colored band on DO-35 body |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables tight regulation without post-production trimming in cost-sensitive consumer applications |
| DO-35 glass package | Provides hermetic sealing and thermal stability for operation up to +200°C junction temperature |
| Low leakage current (0.05 μA) | Minimizes quiescent power loss in always-on sensor biasing and battery backup circuits |
| Positive temperature coefficient (+2.5 mV/°C) | Allows predictable series stacking with negative TC devices to achieve near-zero drift references |
| 500 mW power rating with 4.0 mW/°C derating | Supports robust thermal management in compact PCB layouts with limited copper area |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stable 56 V reference for linear regulator feedback networks and ADC voltage scaling in industrial power modules. IC Role / Device Role / Timing Role: Zener diode providing fixed reference voltage via reverse-biased breakdown. Use Value: ±5% tolerance and +2.5 mV/°C TC enable repeatable calibration across -65°C to +125°C ambient conditions. | Use Scenario: Protection of microcontroller I/O pins against ESD-induced transients exceeding 56 V in automotive body control units. IC Role / Device Role / Timing Role: Shunt clamping element diverting surge current when reverse voltage exceeds 56 V. Use Value: 200 Ω dynamic impedance ensures rapid voltage limiting with sub-100 ns response to fast-rising transients. |
| Sensor Biasing | Signal Level Translation |
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in HVAC control systems. IC Role / Device Role / Timing Role: Precision voltage source maintaining constant current through RTD bridge. Use Value: 0.05 μA leakage prevents measurement error in high-impedance sensor interfaces. | Use Scenario: Level-shifting 3.3 V logic signals to 56 V interface rails in industrial PLC input modules. IC Role / Device Role / Timing Role: Reverse-biased clamp establishing upper voltage limit on translated signal path. Use Value: 18 pF junction capacitance avoids signal distortion up to 10 MHz in digital communication lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4756A | Same 56 V nominal voltage, ±5% tolerance, but rated 1.0 W PD in DO-41 package | Higher power handling suits higher-current regulation; larger DO-41 footprint requires PCB redesign | Select when >500 mW dissipation is required and board space allows DO-41 |
| BZX85C56 | 56 V, ±5%, 1.3 W PD in DO-41, higher ZZ (300 Ω) and leakage (1 μA) | Less precise regulation and higher standby current; better for ruggedized clamping than reference use | Choose for cost-sensitive overvoltage protection where accuracy is secondary to robustness |
Compared with BZX79C56_T50R, the 1N4756A offers higher power capacity in a larger package, while the BZX85C56 trades regulation precision for greater surge resilience - making BZX79C56_T50R optimal for space-constrained, low-leakage reference designs.
Availability
BZX79C56_T50R is available at Aetrix Electronics and suitable for industrial power supplies, sensor conditioning circuits, and overvoltage protection systems requiring stable component supply and long-term obsolescence management.
Supply support for BZX79C56_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 energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud computing, and consumer electronics.
The BZX79C series was designed for general-purpose voltage regulation and transient suppression in cost-sensitive, space-constrained applications - emphasizing reliability, tight tolerance, and DO-35 manufacturability.
FAQ
What is the Zener voltage tolerance for BZX79C56_T50R?
The BZX79C56_T50R has a ±5% Zener voltage tolerance, meaning its breakdown voltage falls between 52 V and 60 V when tested at 2 mA. This tolerance is guaranteed across the full operating temperature range and supports consistent performance in untrimmed reference designs without requiring calibration.
What is the maximum power dissipation for BZX79C56_T50R?
The BZX79C56_T50R is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 4.0 mW/°C - so at 100°C TL, maximum allowable power drops to 400 mW. This derating must be applied in thermal design calculations for reliable long-term operation.
Does BZX79C56_T50R have a specified junction capacitance?
Yes, the BZX79C56_T50R has a junction capacitance of 18 pF measured at 0 V and 1 MHz. This value is critical for high-frequency applications such as RF biasing or fast transient clamping, where parasitic capacitance affects signal integrity and response time.
What is the leakage current specification for BZX79C56_T50R?
The BZX79C56_T50R specifies a maximum leakage current of 0.05 μA at VR = 47 V. This ultra-low leakage supports energy-efficient operation in battery-powered systems and high-impedance sensor biasing where even nanoamp-level currents could introduce measurement errors.
Is BZX79C56_T50R compatible with automated assembly processes?
Yes, the BZX79C56_T50R uses the standard DO-35 glass axial package with industry-standard dimensions and cathode band marking, making it compatible with wave soldering, reflow (with appropriate thermal profiling), and pick-and-place equipment. Its glass body withstands typical lead-free soldering thermal profiles without degradation.
BZX79C56_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- 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_T50R FAQ
1.How can I place an order for BZX79C56_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C56_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 BZX79C56_T50R reliable?
The price and inventory of BZX79C56_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C56_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C56_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C56_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C56_T50R?
BZX79C56_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C56_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 BZX79C56_T50R?
For technical support, including BZX79C56_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C56_T50R requirements.
6.How does Aetrix verify that BZX79C56_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C56_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 BZX79C56_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C56_T50R?
All BZX79C56_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C56_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 BZX79C56_T50R part is unused and in its original packaging.
Return procedure for BZX79C56_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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