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Nexperia USA Inc. BZX384-B47-QX
- Part No.:
- BZX384-B47-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B47-QX.pdf
- Description:
- DIODE ZENER 47V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,743
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Product details
Overview
BZX384-B47-Q from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 47 V nominal breakdown voltage at 2 mA, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage reference and overvoltage protection circuits.
For engineers reviewing the BZX384-B47-Q datasheet, BZX384-B47-Q pinout, BZX384-B47-Q application, or BZX384-B47-Q equivalent, this device serves as a precision low-power shunt regulator in ECU power rails, sensor biasing networks, and ADC reference stabilization where stable 47 V clamping with <±2 % tolerance and low temperature coefficient (±0.05 mV/K) is required.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 47 V reference across its terminals under varying load and temperature conditions. Its differential resistance of ≤375 Ω at IZ = 2 mA ensures minimal voltage deviation during current fluctuations.
Designed for automotive-grade reliability, it supports non-repetitive peak reverse power dissipation up to 40 W (100 μs pulse), junction temperature up to 150 °C, and reverse leakage current ≤170 μA at VR = 37.6 V - enabling robust transient suppression in 12 V/24 V vehicle subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 46.1 V to 47.9 V at IZ = 2 mA - defines precise clamping threshold for overvoltage protection |
| Tolerance | ±2 % - enables tighter regulation than ±5 % C-series, suitable for mid-precision references |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - limits continuous thermal load on PCB without heatsinking |
| Differential Resistance rdif | ≤375 Ω at IZ = 2 mA - determines output impedance and regulation sensitivity to current changes |
| Reverse Leakage Current IR | ≤170 μA at VR = 37.6 V - ensures low standby power loss in always-on automotive modules |
| Temperature Coefficient SZ | ±0.05 mV/K - provides near-zero drift over -65 °C to +150 °C operating range |
| Non-repetitive Peak Power | 40 W (100 μs pulse) - withstands ISO 7637-2 load dump transients without failure |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic case with standard FR4 footprint per Figure 12; dimensions 1.8 mm × 1.35 mm × 0.95 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (marked side) | Cathode (K) | Connected to regulated voltage node; reverse-biased terminal where breakdown occurs |
| 2 | Anode (A) | Ground or lower-potential reference point; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood environments including thermal cycling, humidity, and mechanical shock |
| Low thermal resistance | Rth(j-sp) = 110 K/W - enables efficient heat transfer from junction to solder point on PCB |
| Stable 47 V reference | Guaranteed 46.1–47.9 V range at 2 mA with ±0.05 mV/K tempco - reduces calibration burden in analog front-ends |
| High surge capability | Withstands 40 W non-repetitive reverse pulses - protects downstream circuitry from ISO 16750-2 transients |
| Small-footprint packaging | SOD323 outline fits high-density layouts while maintaining 0.4 mm creepage distance for 47 V isolation |
Applications
| Automotive ECU Power Rail Clamping | Industrial Sensor Bias Reference |
|---|---|
Use Scenario: Stabilizing 47 V auxiliary supply rail in engine control units exposed to load dump transients. IC Role / Device Role / Timing Role: Shunt regulator providing passive overvoltage clamping and reference voltage generation. Use Value: Limits rail voltage to ≤47.9 V during 12 V system transients, preventing damage to microcontroller I/O and CAN transceivers. |
Use Scenario: Supplying stable bias voltage to pressure or temperature sensor bridges in factory automation systems. IC Role / Device Role / Timing Role: Precision Zener reference establishing known excitation potential for ratiometric measurements. Use Value: Enables <±0.2 % measurement accuracy over -40 °C to +125 °C due to low tempco and tight 47 V tolerance. |
| ADC Reference Stabilization | Overvoltage Protection in Telematics Modules |
Use Scenario: Providing clean 47 V reference for 16-bit SAR ADCs measuring battery voltage in ADAS domain controllers. IC Role / Device Role / Timing Role: Low-noise voltage reference source decoupled from noisy DC-DC converter outputs. Use Value: Reduces ADC integral nonlinearity by minimizing reference drift, supporting <±1 LSB error specification. |
Use Scenario: Protecting LTE modem power input against surges in vehicle-mounted telematics gateways. IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing energy from ISO 7637-2 Pulse 5a/b events. Use Value: Survives 40 W transient bursts without degradation, eliminating need for external TVS cascading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-A47-Q | ±1 % tolerance (46.5–47.5 V), higher cost, identical package and thermal specs | Required where reference stability <±0.5 % is mandated (e.g., calibration equipment) | Select when tighter initial accuracy justifies premium pricing and no additional thermal derating is needed. |
| BZX384-C47-Q | ±5 % tolerance (44–50 V), lower cost, same 300 mW rating and AEC-Q101 qualification | Suitable for non-critical clamping where 47 V is nominal but 3 V margin is acceptable | Choose for cost-sensitive body electronics where absolute voltage precision is secondary to surge survival. |
Compared with BZX384-A47-Q, the BZX384-B47-Q trades 1 % initial accuracy for lower unit cost while retaining full automotive qualification; versus BZX384-C47-Q, it delivers twice the voltage precision without sacrificing surge capability or thermal performance.
Availability
BZX384-B47-Q is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telematics module production requiring stable component supply with AEC-Q101 compliance and traceable lot history.
Supply support for BZX384-B47-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 automotive-qualified Zener diode portfolio, engineered specifically for robust voltage regulation and transient protection in harsh-temperature vehicle subsystems.
FAQ
What is the maximum continuous reverse current for BZX384-B47-Q at 25 °C ambient?
The device supports a maximum continuous forward current of 250 mA, but as a Zener regulator, its steady-state reverse current is limited by power dissipation. At 25 °C ambient and 300 mW Ptot, the maximum sustainable reverse current is approximately 6.4 mA (300 mW ÷ 47 V), assuming full regulation at VZ. Derating applies above 25 °C per Rth(j-a) = 415 K/W.
How does the ±2 % tolerance affect voltage regulation in a 47 V reference circuit?
The ±2 % tolerance means the actual breakdown voltage falls between 46.1 V and 47.9 V at 2 mA test current. In a reference circuit, this introduces a fixed offset error that must be calibrated out or accommodated in system-level tolerances. It does not affect dynamic regulation performance, which depends on rdif and thermal stability.
Can BZX384-B47-Q replace a through-hole 1N4752A in an existing design?
No - the BZX384-B47-Q is a surface-mount SOD323 device with different thermal characteristics, mounting requirements, and surge behavior. While both regulate at ~47 V, the 1N4752A has 1 W power rating and TO-204AA package. Direct replacement requires PCB redesign, thermal analysis, and validation of transient response under identical test conditions.
Is the cathode marking bar visible under standard optical inspection?
Yes - the cathode is marked by a distinct bar on the top surface of the SOD323 package, aligned with pin 1 per Figure 11. The bar is laser-marked and clearly visible under 10× magnification or automated AOI systems using standard white-light illumination, ensuring reliable orientation verification during assembly.
BZX384-B47-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):
- 47 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.9 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-B47-QX FAQ
1.How can I place an order for BZX384-B47-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B47-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-B47-QX reliable?
The price and inventory of BZX384-B47-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-B47-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B47-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B47-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B47-QX?
BZX384-B47-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B47-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-B47-QX?
For technical support, including BZX384-B47-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B47-QX requirements.
6.How does Aetrix verify that BZX384-B47-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-B47-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-B47-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B47-QX?
All BZX384-B47-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B47-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-B47-QX part is unused and in its original packaging.
Return procedure for BZX384-B47-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B47-QX Tags
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