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Nexperia USA Inc. BZX79-C3V9,133
- Part No.:
- BZX79-C3V9,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-C3V9,133.pdf
- Description:
- DIODE ZENER 3.9V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:4,143
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Product details
Overview
BZX79-C3V9,133 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal working voltage 3.9 V at 5 mA test current, 400–600 Ω differential resistance, and −2.5 mV/K temperature coefficient. It operates as a low-power voltage reference in bias networks, power supply feedback paths, and overvoltage protection circuits, rated for 500 mW total power dissipation at 50 °C ambient.
For engineers reviewing the BZX79-C3V9,133 datasheet, BZX79-C3V9,133 pinout, BZX79-C3V9,133 application, or BZX79-C3V9,133 equivalent, this page delivers verified electrical parameters, SOD27 package details, reverse leakage (3 μA at VR = 1 V), thermal resistance (380 K/W), and direct alternatives for voltage reference design validation.
Technical Context
This Zener diode functions in reverse-biased breakdown mode to maintain stable DC voltage across its terminals under varying load or input conditions. Its 3.9 V nominal regulation is specified at IZtest = 5 mA, with differential resistance defining output impedance and temperature coefficient quantifying drift versus junction temperature.
The device uses a hermetically sealed glass SOD27 (DO-35) axial package with cathode band marking. Thermal performance is defined by Rth j-a = 380 K/W (unmetallized PCB, max lead length), limiting continuous operation to Tamb ≤ 50 °C for full 500 mW rating per IEC 60134 absolute maximum ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V at IZ = 5 mA - defines regulated output level in shunt reference applications |
| Zener Tolerance | ±5% (C-series) - sets worst-case voltage window of 3.7 V to 4.1 V at 25 °C |
| Differential Resistance | 400–600 Ω - determines load regulation error: ~2 mV change per 5 μA current shift |
| Reverse Leakage Current | 3 μA at VR = 1 V - ensures minimal quiescent current in standby bias networks |
| Temperature Coefficient | −2.5 mV/K - predicts ~−12.5 mV drift over 5 K junction rise, critical for precision references |
| Total Power Dissipation | 500 mW at Tamb = 50 °C - sets maximum continuous shunt power before thermal derating |
| Non-repetitive Peak Power | 40 W for 100 μs - supports transient overvoltage clamping without failure |
Pinout & Package
Hermetically sealed glass SOD27 (DO-35) axial package with cathode identified by a colored 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 / reference ground node | Connected to system ground or lower-potential rail in shunt regulator configuration |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input source via series resistor; provides stable 3.9 V to load |
Key Features
| Feature | Design Value |
|---|---|
| Low-leakage Zener operation | 3 μA IR at VR = 1 V enables microampere-level biasing in battery-powered references |
| Stable low-voltage regulation | 3.9 V nominal with −2.5 mV/K TC allows predictable drift compensation in analog sensor interfaces |
| Robust surge handling | 40 W non-repetitive peak power supports ESD and line-transient suppression up to 100 μs |
| Standardized E24 voltage range | Part of 37-type series covering 2.4–75 V, enabling drop-in replacement across common reference points |
Applications
| Power Supply Feedback | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Stabilizing feedback voltage in adjustable linear regulators (e.g., LM317) or switching converter error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 3.9 V setpoint to control loop. Use Value: Enables accurate output regulation within ±5% tolerance without external trimming components. |
Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers during brown-out detection. IC Role / Device Role / Timing Role: Voltage monitor establishing reliable 3.9 V trip point for POR/RESET logic. Use Value: Delivers sub-5 μA leakage and stable TC to prevent false resets under temperature variation. |
| ADC Reference Buffer | Overvoltage Clamp |
Use Scenario: Providing low-noise, low-drift reference for 10-bit SAR ADCs in industrial sensors. IC Role / Device Role / Timing Role: Precision voltage source buffering internal reference node. Use Value: 400–600 Ω rdif minimizes loading error on reference divider networks. |
Use Scenario: Protecting I/O pins of mixed-signal SoCs against 5 V rail transients. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage to 3.9 V + VF. Use Value: 40 W peak power rating absorbs 100 μs surges without degradation or latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5227BS-7-F (Diodes Inc.) | Same 3.9 V nominal, SOT-23 package, 200 mW rating, 100 Ω rdif | SMT-only; lower power and tighter rdif suit space-constrained digital logic rails | Select when board area is constrained and 200 mW suffices; verify thermal pad layout for reliability |
| BZX55-C3V9 (ON Semiconductor) | Same 3.9 V/±5%, DO-35 package, 500 mW, but 600–1000 Ω rdif and −2.0 mV/K TC | Higher impedance and reduced TC stability limit use in precision analog feedback | Acceptable for non-critical biasing where cost is primary; avoid in high-accuracy voltage references |
Compared with BZX79-C3V9,133, MMBZ5227BS-7-F offers superior rdif in SMT form but sacrifices power handling, while BZX55-C3V9 matches mechanical fit but degrades regulation accuracy due to higher dynamic impedance and less negative TC.
Availability
BZX79-C3V9,133 is available at Aetrix Electronics and suitable for power supply feedback networks, microcontroller reset circuits, ADC reference buffers, and overvoltage clamp designs requiring stable component supply and long-term obsolescence resilience.
Supply support for BZX79-C3V9,133 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 semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, automotive-qualified diodes, MOSFETs, and logic devices.
This part belongs to the BZX79 series of low-power Zener diodes designed specifically for cost-sensitive, high-reliability voltage reference and stabilization in consumer, industrial, and computing power systems.
FAQ
What is the maximum continuous power dissipation for BZX79-C3V9,133?
The device is rated for 500 mW total power dissipation at an ambient temperature of 50 °C with leads ≤8 mm and no PCB metallization pad. At higher temperatures, derating applies per Rth j-a = 380 K/W; for example, at 70 °C ambient, max power drops to ~370 mW to maintain Tj ≤ 200 °C.
How does the −2.5 mV/K temperature coefficient affect circuit performance?
This coefficient means the Zener voltage decreases by approximately 2.5 mV per Kelvin rise in junction temperature. Over a 50 K rise (e.g., 25 °C to 75 °C), VZ shifts down ~125 mV - a 3.2% change relative to 3.9 V - requiring compensation in precision references or selection of tighter-tolerance variants if drift must stay below 1%.
Can BZX79-C3V9,133 be used in place of a 3.3 V Zener diode?
No - it is specified at 3.9 V nominal with ±5% tolerance (3.7–4.1 V range), not 3.3 V. Substituting would raise regulated voltage by ~18%, likely causing overvoltage stress on downstream 3.3 V logic. Use BZX79-C3V3 (3.3 V) or BZX79-C3V6 (3.6 V) instead for that target.
Is the SOD27 package compatible with automated through-hole assembly?
Yes - the SOD27 (DO-35) axial package has standardized 25.4 mm lead spacing and tinned leads compatible with wave soldering and selective soldering equipment. Lead diameter and straightness meet IPC-J-STD-006 requirements, and the hermetic glass body withstands standard reflow preheat profiles up to 150 °C.
BZX79-C3V9,133 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 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-C3V9,133 FAQ
1.How can I place an order for BZX79-C3V9,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-C3V9,133 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-C3V9,133 reliable?
The price and inventory of BZX79-C3V9,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C3V9,133 is usually 5 days.
3.What payment methods are accepted for BZX79-C3V9,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C3V9,133 transactions.
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4.How is shipping managed for BZX79-C3V9,133?
BZX79-C3V9,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-C3V9,133 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-C3V9,133?
For technical support, including BZX79-C3V9,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C3V9,133 requirements.
6.How does Aetrix verify that BZX79-C3V9,133 is sourced from the original manufacturer or authorized distributors?
All BZX79-C3V9,133 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-C3V9,133 meets industry standards.
7.What is the process for return or replacement of BZX79-C3V9,133?
All BZX79-C3V9,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C3V9,133, 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-C3V9,133 part is unused and in its original packaging.
Return procedure for BZX79-C3V9,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79-C3V9,133 Tags
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