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Nexperia USA Inc. BZX79-C56,133
- Part No.:
- BZX79-C56,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-C56,133.pdf
- Description:
- DIODE ZENER 56V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:7,393
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Product details
Overview
BZX79-C56,133 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal 56 V working voltage at 2 mA test current, 100 Ω typical differential resistance, and −200 nA maximum reverse current at 39.2 V. It operates in hermetically sealed SOD27 (DO-35) glass package, rated for 500 mW total power dissipation at 50 °C ambient, and serves as a precision low-power voltage reference in analog front-ends and power supply feedback loops.
For engineers reviewing the BZX79-C56,133 datasheet, BZX79-C56,133 pinout, BZX79-C56,133 application, or BZX79-C56,133 equivalent, key selection criteria include Zener voltage tolerance, temperature coefficient (−200 nA @ VR = 39.2 V), thermal resistance (380 K/W), non-repetitive surge capability (40 W, 100 μs), and DO-35 axial lead compatibility with through-hole PCB layouts.
Technical Context
This device functions as a passive two-terminal shunt voltage regulator, maintaining stable output voltage across variable load currents by operating in reverse breakdown. Its 56 V nominal Zener voltage is specified at IZtest = 2 mA, with a typical temperature coefficient of +70 mV/K and differential resistance of 100 Ω - indicating moderate regulation sensitivity to current and thermal drift.
The SOD27 package enables reliable operation up to 200 °C junction temperature, while its 380 K/W junction-to-ambient thermal resistance requires minimal PCB copper area for thermal management. Non-repetitive peak reverse power dissipation reaches 40 W for 100 μs pulses, supporting transient overvoltage clamping in low-energy protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 52 V min., 60 V max. at IZ = 2 mA - defines usable regulation band for 56 V nominal reference |
| Differential Resistance (rdif) | 100 Ω typ. at IZ = 2 mA - quantifies voltage change per mA load variation |
| Reverse Current (IR) | ≤200 nA at VR = 39.2 V - ensures low leakage in high-impedance bias networks |
| Total Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C - sets continuous DC power limit under standard mounting |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - supports single-event surge suppression without failure |
| Junction Temperature Range (Tj) | −65 °C to +200 °C - enables operation in extended industrial and automotive under-hood environments |
| Package | SOD27 (DO-35) - axial-leaded hermetic glass package with cathode band marking |
Pinout & Package
Hermetically sealed SOD27 (DO-35) glass package with axial leads: cathode identified by a colored band; anode is unmarked lead. Leads are tinned copper-clad steel, compatible with wave and hand soldering per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage reference node | Connected to circuit ground or lowest potential point in shunt regulator configuration |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input voltage source and load; maintains stable 56 V relative to anode during reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables cost-effective voltage referencing where tight regulation is not required, e.g., overvoltage detection thresholds |
| 500 mW power rating at 50 °C ambient | Supports continuous operation in compact PCB layouts without heatsinking under moderate ambient conditions |
| Hermetic SOD27 glass package | Provides long-term stability and moisture resistance critical for industrial control and outdoor electronics |
| Low reverse leakage (200 nA @ 39.2 V) | Minimizes error in high-impedance voltage divider networks used in precision sensing and ADC reference circuits |
| 40 W non-repetitive surge rating | Allows integration into basic transient voltage suppression paths without external TVS diodes in low-energy systems |
Applications
| Industrial Sensor Signal Conditioning | Switch-Mode Power Supply Feedback |
|---|---|
Use Scenario: Stabilizing reference voltage for 4–20 mA transmitter ICs in process automation transmitters. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed bias for op-amp and current-sense amplifier stages. Use Value: Maintains 56 V reference despite ±15% supply rail variation, enabling accurate loop current calibration over temperature. | Use Scenario: Setting output voltage threshold in isolated flyback converter feedback network using optocoupler-coupled TL431 circuit. IC Role / Device Role / Timing Role: Secondary-side Zener clamp limiting optocoupler LED forward voltage to prevent saturation. Use Value: Ensures consistent optocoupler CTR and stable regulation margin across line and load transients. |
| Automotive Body Control Module (BCM) | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Providing regulated bias for LIN bus transceiver internal regulators in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Low-power voltage reference stabilizing internal LDO input under battery voltage fluctuations (9–16 V). Use Value: Enables reliable LIN communication down to 9 V battery voltage without brown-out resets. | Use Scenario: Clamping transient spikes on 24 V digital input channels exposed to inductive load switching noise. IC Role / Device Role / Timing Role: Passive shunt limiter absorbing short-duration surges before reaching FPGA or microcontroller GPIO pins. Use Value: Limits input voltage to ≤60 V during 100 μs transients, preventing latch-up in 3.3 V/5 V logic interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4756A | Same 56 V nominal, ±5% tolerance, but DO-41 package (larger footprint, higher Ptot = 1 W) | Requires larger PCB real estate; better suited for higher continuous power dissipation | Select when >500 mW steady-state power handling is needed or legacy DO-41 layout compatibility is required |
| BZX85C56 | 56 V, ±5%, but in DO-41 package with higher Ptot = 1.3 W and lower rdif ≈ 40 Ω | Improved regulation accuracy and thermal headroom; not drop-in due to package size | Choose for improved voltage stability under varying load current or elevated ambient temperatures |
Compared with BZX79-C56,133, the 1N4756A offers higher power margin in a larger package, while BZX85C56 delivers tighter regulation and greater surge resilience - both require layout revision but provide measurable improvements in thermal and dynamic performance.
Availability
BZX79-C56,133 is available at Aetrix Electronics and suitable for industrial sensor conditioning, switch-mode power supply feedback, automotive body control modules, and PLC input protection requiring stable component supply and long-lifecycle support.
Supply support for BZX79-C56,133 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
Nexperia is a global leader in discrete, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, consumer, and wearable markets with high-volume, high-reliability components.
The BZX79 series belongs to Nexperia's standard Zener diode portfolio, designed specifically for low-power voltage regulation and reference applications in cost-sensitive, space-constrained designs where hermetic reliability and E24 voltage coverage are essential.
FAQ
What is the maximum continuous reverse current this diode can handle?
The BZX79-C56,133 has no specified maximum continuous reverse current rating because it operates in Zener breakdown mode. Its safe operating limit is defined by power dissipation: at 50 °C ambient, maximum continuous reverse current is approximately 8.9 mA (500 mW ÷ 56 V), assuming full voltage drop across the diode. Exceeding this risks thermal runaway.
Can this diode be used in surface-mount designs?
No - the BZX79-C56,133 uses the axial-leaded SOD27 (DO-35) glass package, which is strictly through-hole mountable. For surface-mount equivalents, consider Nexperia's PZM56xx series SOT23 Zeners or BZX384-C56 in SOD323, which offer comparable 56 V regulation in RoHS-compliant SMD packages.
How does temperature affect its Zener voltage stability?
At 56 V nominal, the BZX79-C56,133 exhibits a positive temperature coefficient of approximately +70 mV/K near IZ = 2 mA. This means its Zener voltage increases by ~3.9 mV per °C rise - a known characteristic of higher-voltage Zeners that must be compensated in precision references via resistor networks or complementary diode pairs.
Is the cathode marked on the physical device?
Yes - the cathode is clearly identified by a single dark-colored band (typically black or dark gray) located near one end of the glass envelope. The unmarked lead is the anode. This marking conforms to JEDEC DO-35 standards and is visible under standard visual inspection during manual or automated assembly.
BZX79-C56,133 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 39.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ALF2
BZX79-C56,133 FAQ
1.How can I place an order for BZX79-C56,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-C56,133 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 BZX79-C56,133 reliable?
The price and inventory of BZX79-C56,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C56,133 is usually 5 days.
3.What payment methods are accepted for BZX79-C56,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C56,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-C56,133?
BZX79-C56,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-C56,133 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 BZX79-C56,133?
For technical support, including BZX79-C56,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C56,133 requirements.
6.How does Aetrix verify that BZX79-C56,133 is sourced from the original manufacturer or authorized distributors?
All BZX79-C56,133 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 BZX79-C56,133 meets industry standards.
7.What is the process for return or replacement of BZX79-C56,133?
All BZX79-C56,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C56,133, 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 BZX79-C56,133 part is unused and in its original packaging.
Return procedure for BZX79-C56,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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