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Nexperia USA Inc. BZX79-C51,113
- Part No.:
- BZX79-C51,113
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-C51,113.pdf
- Description:
- DIODE ZENER 51V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:7,926
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Product details
Overview
BZX79-C51,113 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal working voltage 51 V, 400–500 mW total power dissipation at Tamb = 50 °C, and differential resistance ≤400 Ω at IZtest = 2 mA. It operates as a low-power voltage reference in biasing, regulation, and overvoltage protection circuits for industrial power supplies and sensor signal conditioning.
For engineers reviewing the BZX79-C51,113 datasheet, BZX79-C51,113 pinout, BZX79-C51,113 application, or BZX79-C51,113 equivalent, this part serves as a cost-optimized, through-hole Zener reference where ±5% voltage tolerance and DO-35 package compatibility are design priorities.
Technical Context
The BZX79-C51,113 functions as a reverse-biased silicon Zener diode, maintaining stable voltage across its terminals when reverse current exceeds the knee threshold (IZtest = 2 mA). Its temperature coefficient of +38.6 to +57.2 mV/K indicates positive drift above ~5 V, requiring thermal compensation in precision references.
Designed for operation up to Tj = 200 °C and storage down to −65 °C, it supports non-repetitive surge handling up to 40 W for 100 μs pulses, with junction-to-ambient thermal resistance of 380 K/W under standard PCB mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VZ) | 48.0–54.0 V at IZ = 2 mA - defines nominal regulation point with ±5% tolerance band |
| Total Power Dissipation | 400 mW at Tamb = 50 °C (no pad), 500 mW at Tamb = 50 °C (with note 2 lead length) - sets continuous DC power limit under defined thermal conditions |
| Differential Resistance | ≤400 Ω at IZ = 2 mA - determines output impedance and load regulation error under varying current |
| Reverse Current (IR) | ≤50 nA at VR = 0.7 × VZnom - ensures minimal leakage in high-impedance bias networks |
| Non-repetitive Peak Power | 40 W for tp = 100 μs - enables transient overvoltage clamping without device failure |
| Temperature Coefficient | +38.6 to +57.2 mV/K - quantifies voltage drift per degree Celsius, critical for thermal stability in unregulated environments |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a black band. Leads are tinned copper-clad steel; body diameter 1.85 mm, length 4.25 mm, lead spacing 25.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in reverse-bias regulation | Connected to lower potential node; carries forward current up to 250 mA or reverse leakage current |
| Cathode | Zener breakdown terminal / high-side connection in reverse-bias regulation | Marked with black band; referenced to system ground or supply rail for voltage stabilization |
Key Features
| Feature | Design Value |
|---|---|
| ±5% voltage tolerance | Enables cost-sensitive designs where tight regulation is not required, such as power supply feedback dividers or coarse voltage references |
| 400–500 mW power rating | Supports continuous regulation in low-current applications (<10 mA) without heatsinking on standard FR-4 PCBs |
| DO-35 axial package | Ensures compatibility with legacy through-hole assembly processes and manual prototyping workflows |
| −65 °C to +200 °C operating range | Validates use in extended-temperature industrial and automotive under-hood environments without derating |
Applications
| Industrial Power Supply Feedback | Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback or buck-derived auxiliary supplies for PLC I/O modules. IC Role / Device Role / Timing Role: Zener reference providing fixed voltage threshold for optocoupler-based regulation loop. Use Value: Maintains ±5% output accuracy over line/load variations without active compensation circuitry. | Use Scenario: Clamping and biasing analog front-end inputs in pressure or temperature transducers. IC Role / Device Role / Timing Role: Reverse-biased voltage limiter protecting op-amp inputs from ESD or overvoltage transients. Use Value: Limits input swing to 51 V while drawing <50 nA leakage, preserving signal integrity in high-Z sensor paths. |
| Overvoltage Protection Circuit | Microcontroller Reset Supervision |
Use Scenario: Crowbar-style surge suppression in 48 V telecom power distribution boards. IC Role / Device Role / Timing Role: Fast-acting shunt element triggered during line surges exceeding 51 V threshold. Use Value: Absorbs 40 W for 100 μs pulses without degradation, enabling single-device transient protection. | Use Scenario: Generating reliable reset signal for 3.3 V microcontrollers powered from 5 V rails. IC Role / Device Role / Timing Role: Zener-based voltage divider feeding comparator input to detect brown-out conditions. Use Value: Provides stable 51 V reference point for ratio-metric monitoring, unaffected by supply ripple below regulation knee. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | 5.1 V nominal, ±5%, DO-41 package, Ptot = 1 W | Lower voltage, higher power - suited for 5 V logic rail regulation, not 48–54 V systems | Select only if target regulation voltage is 5.1 V and board space allows larger DO-41 footprint |
| BZX85-C51 | 51 V nominal, ±5%, DO-41 package, Ptot = 1.3 W, rdif ≈ 100 Ω | Higher power rating and lower dynamic impedance - better for higher-current regulation or tighter load regulation | Choose when >10 mA Zener current or improved regulation accuracy is required; requires DO-41 footprint |
Compared with 1N4733A and BZX85-C51, the BZX79-C51,113 offers optimal balance of 51 V regulation, DO-35 compatibility, and 500 mW dissipation for space-constrained industrial control boards where ±5% tolerance is acceptable.
Availability
BZX79-C51,113 is available at Aetrix Electronics and suitable for industrial power supply feedback, sensor signal conditioning, overvoltage protection circuits, and microcontroller reset supervision requiring stable component supply and long-term obsolescence management.
Supply support for BZX79-C51,113 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 semiconductors, formed in 2017 from the former NXP Standard Products division, with focus on automotive, industrial, computing, and consumer markets.
The BZX79 series belongs to Nexperia's voltage regulator diode product line, designed specifically for low-power, cost-effective voltage referencing and stabilization in through-hole assembled equipment.
FAQ
What is the maximum continuous Zener current for BZX79-C51,113 at 50 °C ambient?
At Tamb = 50 °C, the maximum continuous Zener current is derived from Ptot = 400–500 mW and VZ = 48–54 V, yielding 7.4–10.4 mA. Operation above this range risks thermal runaway unless board-level heat sinking is implemented per Figure 2 thermal curves.
Does BZX79-C51,113 have a specified Zener impedance at 1 mA?
No - the datasheet specifies differential resistance (rdif) only at IZtest = 2 mA (≤400 Ω). At 1 mA, rdif increases significantly due to operation near the knee region; actual values are not characterized and must be measured or estimated from Fig.5/Fig.6 curves.
Can BZX79-C51,113 replace BZX79-B51 in existing designs?
Yes, but with reduced voltage accuracy: BZX79-B51 offers ±2% tolerance (49.95–52.05 V), while BZX79-C51,113 provides ±5% (48.0–54.0 V). Use only where looser regulation is acceptable and thermal limits remain within spec.
Is the cathode marking visible on the physical BZX79-C51,113 device?
Yes - the cathode is marked by a distinct black band on the glass body, consistent with SOD27/DO-35 industry standard. This band aligns with the cathode terminal identified in the pinout table and must connect to the higher-potential node in reverse-bias operation.
BZX79-C51,113 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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-C51,113 FAQ
1.How can I place an order for BZX79-C51,113 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-C51,113 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-C51,113 reliable?
The price and inventory of BZX79-C51,113 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C51,113 is usually 5 days.
3.What payment methods are accepted for BZX79-C51,113?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C51,113 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-C51,113?
BZX79-C51,113 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-C51,113 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-C51,113?
For technical support, including BZX79-C51,113 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C51,113 requirements.
6.How does Aetrix verify that BZX79-C51,113 is sourced from the original manufacturer or authorized distributors?
All BZX79-C51,113 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-C51,113 meets industry standards.
7.What is the process for return or replacement of BZX79-C51,113?
All BZX79-C51,113 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C51,113, 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-C51,113 part is unused and in its original packaging.
Return procedure for BZX79-C51,113:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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