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Nexperia USA Inc. BZX79-B3V9,143
- Part No.:
- BZX79-B3V9,143
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B3V9,143.pdf
- Description:
- DIODE ZENER 3.9V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BZX79-B3V9,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 3.9 V nominal Zener voltage at 5 mA test current, 400 Ω typical differential resistance, and −2.5 mV/K temperature coefficient. It delivers stable low-voltage reference or stabilization in power supply feedback paths, sensor biasing circuits, and overvoltage protection clamps.
For engineers reviewing the BZX79-B3V9,143 datasheet, BZX79-B3V9,143 pinout, BZX79-B3V9,143 application, or BZX79-B3V9,143 equivalent, this part serves as a precision 3.9 V shunt reference with low leakage (≤3 μA at 1 V reverse), 500 mW total power dissipation, and robust non-repetitive surge capability (40 W, 100 μs).
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable voltage across its terminals under varying load or input conditions. Its −2.5 mV/K temperature coefficient ensures predictable drift over junction temperatures from −65 °C to +200 °C, and its 400 Ω typical differential resistance minimizes output impedance variation with current.
The device is optimized for low-power DC stabilization where tight voltage tolerance and low thermal drift are required. Its 3.9 V nominal Zener voltage places it within the optimal range for 3.3 V system rail monitoring and 5 V LDO feedback networks, with reverse leakage capped at 3 μA at VR = 1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.82–3.98 V at IZ = 5 mA; ensures ±2% regulation accuracy for 3.3 V/3.6 V system references |
| Differential Resistance (rdiff) | 400 Ω typ., ≤600 Ω max. at IZ = 5 mA; limits output voltage shift under load current changes |
| Temperature Coefficient (SZ) | −2.5 mV/K typ. at IZ = 5 mA; enables predictable, linear drift compensation in temperature-sensitive circuits |
| Reverse Leakage (IR) | ≤3 μA at VR = 1 V; minimizes quiescent current loss in battery-powered voltage monitor nodes |
| Total Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C; supports continuous operation in compact PCB layouts without forced cooling |
| Non-repetitive Peak Power (PZSM) | 40 W at tp = 100 μs; provides transient overvoltage clamping for ESD or inductive spike suppression |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode band marking; 2-terminal unidirectional Zener configuration. Lead length ≤8 mm; tie-point temperature ≤50 °C per IEC 60134 limiting values.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference return | Connected to circuit ground or lower-potential node; establishes reference baseline for regulated voltage |
| Cathode | Zener breakdown terminal / regulated output node | Connected to voltage source or feedback point; maintains 3.9 V relative to anode under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct use in 3.3 V system feedback without trimming resistors or calibration |
| Low temperature coefficient (−2.5 mV/K) | Reduces voltage drift to <±15 mV over −40 °C to +85 °C ambient operating range |
| Hermetic glass SOD27 package | Ensures long-term parameter stability and moisture resistance in industrial environments |
| 40 W non-repetitive surge rating | Clamps fast transients (e.g., relay coil flyback, ESD) without degradation or parametric shift |
| 3 μA max. reverse leakage at 1 V | Preserves battery life in always-on sensor bias or low-power supervisor circuits |
Applications
| Power Supply Feedback | Sensor Bias Reference |
|---|---|
|
Use Scenario: Regulating output of adjustable linear regulators (e.g., LM317) or providing feedback to switching controller error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise 3.9 V setpoint for feedback divider network. Use Value: Eliminates need for external trimming; maintains ±2% output accuracy across line/load/temperature variations. |
Use Scenario: Providing stable excitation voltage to resistive sensors (e.g., RTDs, thermistors) in data acquisition front-ends. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage reference source for ratiometric measurement circuits. Use Value: Limits sensor reading error to <0.5% full-scale due to reference stability and minimal self-heating. |
| Overvoltage Clamp | Microcontroller Reset Supervisor |
|
Use Scenario: Protecting I/O pins or analog inputs from transient surges exceeding 3.9 V, such as ESD or inductive kickback. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverting excess energy to ground before damage threshold is reached. Use Value: Withstands 40 W pulses (100 μs) without parameter shift, enabling single-device transient suppression. |
Use Scenario: Generating reliable reset signal for microcontrollers when supply drops below 3.9 V during brown-out events. IC Role / Device Role / Timing Role: Precision threshold detector interfaced with Schmitt-trigger buffer or comparator input. Use Value: Provides deterministic 3.9 V trip point with <±50 mV hysteresis margin, avoiding false resets near nominal rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4729A | 3.6 V nominal, ±5% tolerance, 10 Ω rdiff, higher leakage (10 μA @ 1 V) | Looser regulation accuracy; suitable only where 3.6 V target and ±5% tolerance are acceptable | Select only if cost sensitivity outweighs voltage precision and thermal stability requirements |
| BZX84-C3V9 | SOT-23 surface-mount, ±5% tolerance, 90 Ω rdiff, 5 μA leakage @ 1 V | PCB space-constrained designs requiring reflow assembly; lacks hermetic seal and surge robustness | Prefer for high-volume automated assembly where board area > reliability in harsh environments |
Compared with 1N4729A and BZX84-C3V9, BZX79-B3V9,143 offers superior voltage accuracy (±2% vs ±5%), lower thermal drift (−2.5 mV/K vs −3.5 mV/K), and higher surge resilience (40 W vs 1 W), making it optimal for industrial-grade reference and protection roles.
Availability
BZX79-B3V9,143 is available at Aetrix Electronics and suitable for power supply feedback networks, sensor biasing circuits, overvoltage clamping, and microcontroller reset supervision requiring stable component supply and long-term parameter consistency.
Supply support for BZX79-B3V9,143 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.
This device belongs to the BZX79 series of low-power Zener diodes designed specifically for precision voltage regulation and reference applications in cost-sensitive, high-reliability systems.
FAQ
What is the maximum continuous power dissipation for BZX79-B3V9,143 at 50 °C ambient?
The maximum continuous power dissipation is 500 mW when mounted on a PCB with lead length ≤8 mm and tie-point temperature ≤50 °C, per IEC 60134 limiting values. Derating applies above 50 °C ambient - thermal resistance is 380 K/W junction-to-ambient.
Can BZX79-B3V9,143 be used in place of a 3.3 V Zener diode?
No - its nominal Zener voltage is 3.9 V (3.82–3.98 V), not 3.3 V. Using it as a 3.3 V reference would result in ~18% over-regulation and potential circuit malfunction. For 3.3 V, consider BZX79-B3V3,143 (3.23–3.37 V).
Is the SOD27 package compatible with wave soldering processes?
Yes - the hermetically sealed glass SOD27 package is qualified for wave soldering per Nexperia's mounting instructions, with peak temperature ≤260 °C for ≤10 seconds and preheat ramp rate ≤3 °C/s to avoid thermal shock cracking.
What is the typical Zener impedance at 1 mA test current?
At IZ = 1 mA, differential resistance is not specified in the datasheet; the published rdiff values (400 Ω typ.) apply only at IZ = 5 mA. At 1 mA, impedance rises significantly - expect >1 kΩ based on curve extrapolation from Fig.5 and Table 1.
BZX79-B3V9,143 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:
- ±2%
- 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-B3V9,143 FAQ
1.How can I place an order for BZX79-B3V9,143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B3V9,143 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-B3V9,143 reliable?
The price and inventory of BZX79-B3V9,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B3V9,143 is usually 5 days.
3.What payment methods are accepted for BZX79-B3V9,143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B3V9,143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B3V9,143?
BZX79-B3V9,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B3V9,143 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-B3V9,143?
For technical support, including BZX79-B3V9,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B3V9,143 requirements.
6.How does Aetrix verify that BZX79-B3V9,143 is sourced from the original manufacturer or authorized distributors?
All BZX79-B3V9,143 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-B3V9,143 meets industry standards.
7.What is the process for return or replacement of BZX79-B3V9,143?
All BZX79-B3V9,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B3V9,143, 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-B3V9,143 part is unused and in its original packaging.
Return procedure for BZX79-B3V9,143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79-B3V9,143 Tags
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