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Nexperia USA Inc. BZX384-B4V7-QX
- Part No.:
- BZX384-B4V7-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B4V7-QX.pdf
- Description:
- DIODE ZENER 4.7V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,208
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Product details
Overview
BZX384-B4V7-Q from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 4.7 V nominal breakdown at 5 mA, with 300 mW total power dissipation and AEC-Q101 qualification for automotive voltage reference and overvoltage protection circuits.
For engineers reviewing the BZX384-B4V7-Q datasheet, BZX384-B4V7-Q pinout, BZX384-B4V7-Q application, or BZX384-B4V7-Q equivalent, this part delivers stable 4.7 V regulation in space-constrained automotive ECUs, sensor biasing networks, and low-power supply rail clamping where ±2 % precision, 150 °C junction temperature capability, and surge immunity up to 40 W are required.
Technical Context
This device operates as a reverse-biased Zener diode with a nominal 4.7 V breakdown voltage at IZ = 5 mA, differential resistance ≤80 Ω, and temperature coefficient of −3.5 to +0.2 mV/K. It maintains regulation under transient surges up to 40 W (100 μs pulse) and supports continuous operation at Tj ≤ 150 °C.
Designed for surface-mount use on FR4 PCBs with standard SOD323 footprint, it exhibits 300 μW maximum steady-state power dissipation at 25 °C ambient, 415 K/W junction-to-ambient thermal resistance, and reverse leakage ≤3 μA at VR = 3.76 V (80 % of VZ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 4.61 V to 4.79 V at IZ = 5 mA - ensures precise 4.7 V regulation within ±2 % tolerance for reference stability |
| Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C - defines maximum continuous DC power handling on standard FR4 PCB |
| Differential Resistance rdif | ≤80 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Reverse Leakage IR | ≤3 μA at VR = 3.76 V - guarantees minimal quiescent current in standby bias networks |
| Non-repetitive Peak Power | 40 W for 100 μs - enables robust transient overvoltage suppression without failure |
| Junction Temperature Tj | −65 °C to +150 °C - supports operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SOD323 (SC-76), 2-pin surface-mount plastic package with cathode marked by bar; dimensions 1.8 mm × 1.35 mm × 0.95 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity mark (bar) on package identifies this terminal |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-bias configuration enables Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % VZ tolerance | Enables tight voltage reference accuracy without post-production trimming in cost-sensitive automotive modules |
| AEC-Q101 qualification | Validates long-term reliability under automotive thermal, mechanical, and electrical stress profiles |
| 40 W non-repetitive surge rating | Protects downstream circuitry against ISO 7637-2 pulse 1/2a/5a transients in 12 V vehicle systems |
| SOD323 footprint compatibility | Supports high-density PCB layouts with industry-standard reflow/wave soldering processes |
| 150 °C max junction temperature | Permits placement near heat-generating components in engine control units and ADAS sensors |
Applications
| Automotive ECU Voltage Reference | Industrial Sensor Biasing |
|---|---|
|
Use Scenario: Providing stable 4.7 V reference for analog front-end comparators and ADCs in engine control units. IC Role / Device Role / Timing Role: Zener regulator supplying precision bias voltage to op-amps and voltage supervisors. Use Value: ±2 % tolerance and −3.5 to +0.2 mV/K TC ensure <±15 mV drift over −40 °C to +125 °C ambient, meeting ASIL-B functional safety margin requirements. |
Use Scenario: Biasing bridge-based pressure and temperature sensors in factory automation transmitters. IC Role / Device Role / Timing Role: Low-drift voltage reference source for Wheatstone bridge excitation. Use Value: 3 μA max reverse leakage at 3.76 V minimizes error contribution in microamp-level sensor bias currents. |
| USB Port Overvoltage Clamp | Low-Power IoT Supply Rail Protection |
|
Use Scenario: Clamping 5 V USB data line voltage during ESD events or hot-plug transients. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing 40 W surges within 100 μs. Use Value: 40 W peak power rating and 110 K/W junction-to-solder-point thermal resistance enable rapid energy dissipation without thermal runaway. |
Use Scenario: Regulating 4.7 V supply for BLE SoCs and environmental sensors in battery-powered edge nodes. IC Role / Device Role / Timing Role: Low-quiescent-current shunt regulator maintaining stable rail under variable load. Use Value: 300 mW power budget and SOD323 footprint allow integration into compact coin-cell–powered PCBs with minimal board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-A4V7-Q | ±1 % VZ tolerance (4.65–4.75 V), higher cost, tighter rdif (≤50 Ω) | Required where <±5 mV reference accuracy is mandated, e.g., precision ADC references | Select when absolute voltage accuracy outweighs cost sensitivity and surge margin is secondary |
| BZX384-C4V7-Q | ±5 % VZ tolerance (4.4–5.0 V), lower cost, higher IR (≤10 μA at 3.76 V) | Suitable for non-critical clamping where cost and availability drive selection | Choose for consumer-grade power rails where ±200 mV regulation window is acceptable |
Compared with BZX384-A4V7-Q, this BZX384-B4V7-Q offers balanced accuracy and surge resilience at lower cost; versus BZX384-C4V7-Q, it provides tighter regulation and lower leakage for automotive and industrial signal conditioning where stability matters.
Availability
BZX384-B4V7-Q is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, USB port protection circuits, and low-power IoT supply rails requiring stable component supply with AEC-Q101 assurance.
Supply support for BZX384-B4V7-Q 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 semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BZX384-Q series belongs to Nexperia's AEC-Q101–qualified Zener diode portfolio, engineered specifically for automotive voltage reference, overvoltage protection, and biasing applications demanding precision, ruggedness, and long-term reliability.
FAQ
What is the maximum continuous forward current for BZX384-B4V7-Q?
The device is not intended for forward conduction; its absolute maximum forward current is 250 mA per limiting values table, but typical operation is reverse-biased. Forward voltage is 0.9 V at 10 mA and 1.1 V at 100 mA-values relevant only for ESD testing or fault analysis, not functional use.
Can BZX384-B4V7-Q replace a 1N4732A in an existing design?
No-1N4732A is a 4.7 V, 1 W through-hole Zener in DO-41 package. BZX384-B4V7-Q is a 300 mW SOD323 device with different thermal behavior, surge capability, and footprint. Direct replacement requires PCB redesign, power derating analysis, and validation of 40 W surge performance versus 1N4732A's 1 W rating.
What is the reverse leakage current at 3.0 V ambient temperature?
At VR = 3.0 V and Tj = 25 °C, reverse leakage is <0.1 μA (typical), well below the 3 μA maximum specified at VR = 3.76 V. This ultra-low leakage supports high-impedance bias networks in precision analog circuits.
How does the temperature coefficient affect regulation accuracy across −40 °C to +125 °C?
With SZ = −3.5 to +0.2 mV/K, worst-case drift is ~0.57 V over 165 K span-approximately ±12 % of nominal VZ. However, at IZ = 5 mA and moderate ambient, actual drift remains within ±15 mV due to self-heating compensation and typical operating conditions.
BZX384-B4V7-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.7 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-B4V7-QX FAQ
1.How can I place an order for BZX384-B4V7-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B4V7-QX 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 BZX384-B4V7-QX reliable?
The price and inventory of BZX384-B4V7-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-B4V7-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B4V7-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B4V7-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B4V7-QX?
BZX384-B4V7-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B4V7-QX 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 BZX384-B4V7-QX?
For technical support, including BZX384-B4V7-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B4V7-QX requirements.
6.How does Aetrix verify that BZX384-B4V7-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-B4V7-QX 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 BZX384-B4V7-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B4V7-QX?
All BZX384-B4V7-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B4V7-QX, 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 BZX384-B4V7-QX part is unused and in its original packaging.
Return procedure for BZX384-B4V7-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B4V7-QX Tags
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