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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. BZX384-C47-QX

Name: BZX384-C47-QX
Brand: Nexperia USA Inc.
SKU: BZX384-C47-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX384-C47-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: BZX384-C47-QX.pdf

Description:: DIODE ZENER 47V 300MW SOD323

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Product details

Overview

BZX384-C47-Q from Nexperia is a ±5 % 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-C47-Q datasheet, BZX384-C47-Q pinout, BZX384-C47-Q application, or BZX384-C47-Q equivalent, this device serves as a precision low-power shunt regulator in ECU power rails, sensor biasing networks, and CAN transceiver clamp circuits where stable 47 V regulation and automotive-grade reliability are required.

Technical Context

This Zener diode operates in reverse-biased breakdown mode with a typical differential resistance of 375 Ω at 2 mA and a temperature coefficient of +0.05 mV/K, enabling stable regulation across ambient temperatures from −65 °C to +150 °C. Its non-repetitive peak reverse power dissipation is rated at 40 W for 100 μs pulses.

The device features low reverse leakage (<170 μA at VR = 40 V), junction-to-ambient thermal resistance of 415 K/W on FR4 PCB, and cathode-anode polarity clearly marked by a bar on the SOD323 body - supporting compact layout in space-constrained automotive modules.

Key Specifications

Parameter	Value and Actual Design Meaning
Breakdown Voltage V_Z	44.0 V to 50.0 V at I_Z = 2 mA - defines usable regulation window under standard test conditions
Tolerance	±5 % - supports cost-sensitive automotive applications where tight voltage binning is not required
Total Power Dissipation	300 mW at T_amb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB
Differential Resistance r_dif	375 Ω max at I_Z = 2 mA - determines output impedance and load regulation sensitivity
Reverse Current I_R	≤170 μA at V_R = 40 V - ensures minimal quiescent current in standby clamp configurations
Junction Temperature Range	−65 °C to +150 °C - enables operation in under-hood automotive environments
AEC-Q101 Qualified	Yes - validated for automotive discrete semiconductor stress testing including HTGB, HTRB, and temperature cycling

Pinout & Package

SOD323 (SC-76) surface-mount plastic package: 2-terminal, 1.35 mm × 0.85 mm body, 0.45 mm height, cathode marked by bar on top surface.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode (K)	Connected to regulated output node; reverse-bias voltage applied here to initiate Zener conduction
2	Anode (A)	Connected to ground or lower-potential rail; completes current path during regulation

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive use per stress tests including HTGB, HTRB, and temperature cycling - eliminates need for additional qualification effort
±5 % voltage tolerance	Enables cost-effective selection for non-critical 47 V reference points without premium binning costs
300 mW power rating	Supports continuous regulation in low-current bias networks (e.g., op-amp references, microcontroller reset supervisors)
40 W non-repetitive surge capability	Clamps transient overvoltages (e.g., ISO 7637-2 pulse 1/2a/5a) without failure in automotive supply lines
SOD323 footprint	0.65 mm pitch, 1.35 mm × 0.85 mm outline - compatible with high-density PCB assembly and reflow/wave soldering per Nexperia's recommended land patterns

Applications

Engine Control Unit (ECU) Power Rail Clamp

Automotive Sensor Bias Reference

Use Scenario: Clamping 12 V battery-derived supply against load-dump transients in engine management systems.

IC Role / Device Role / Timing Role: Shunt regulator providing overvoltage protection by conducting excess current above 47 V threshold.

Use Value: Limits rail voltage to safe levels for downstream 5 V LDOs and MCU I/O, leveraging 40 W pulse rating and AEC-Q101 robustness.

Use Scenario: Generating stable 47 V bias for piezoresistive pressure sensor excitation in exhaust gas recirculation (EGR) modules.

IC Role / Device Role / Timing Role: Precision voltage reference source maintaining constant sensor bridge excitation despite input fluctuations.

Use Value: Delivers <170 μA leakage and +0.05 mV/K tempco to minimize measurement drift across −40 °C to +125 °C operating range.

CAN Transceiver V_CC Protection

Body Control Module (BCM) Reset Supervisor

Use Scenario: Protecting isolated CAN FD transceiver V_CC pins from induced surges on vehicle wiring harnesses.

IC Role / Device Role / Timing Role: Fast-acting clamp diode absorbing energy from ISO 16750-2 electrical fast transients.

Use Value: Responds within nanoseconds due to low junction capacitance (≤40 pF at 0 V), preventing latch-up in 5 V CAN PHY circuitry.

Use Scenario: Monitoring 48 V auxiliary battery voltage to assert microcontroller reset when falling below safe operating threshold.

IC Role / Device Role / Timing Role: Threshold detector using Zener breakdown to trigger comparator input at precise 47 V trip point.

Use Value: Enables accurate brown-out detection with ±5 % tolerance matching BCM system-level voltage margin requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX384-B47-Q	±2 % tolerance, 250 Ω max r_dif at 5 mA, 47 V nominal at 5 mA	Higher precision needed for analog signal conditioning; tighter tempco (−0.2 mV/K)	Select when regulation stability under varying load current is critical and cost premium is acceptable
MMSZ47ET1G	±5 % tolerance, SOD-123 package, 500 mW P_tot, 47 V at 10 mA	Larger footprint, higher power handling, but no AEC-Q101 qualification	Choose for industrial non-automotive designs requiring higher continuous dissipation and legacy footprint compatibility

Compared with BZX384-B47-Q, this part trades regulation accuracy for automotive qualification and smaller size; versus MMSZ47ET1G, it sacrifices power headroom for AEC-Q101 compliance and board-space efficiency in modern automotive ECUs.

Availability

BZX384-C47-Q is available at Aetrix Electronics and suitable for automotive ECU design, sensor module development, and CAN network protection requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZX384-C47-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-enhancing components, delivering high-performance, reliable, and scalable solutions for automotive, industrial, and consumer markets.

The BZX384-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for robust voltage reference and transient suppression in harsh-temperature vehicle subsystems.

FAQ

What is the test current used to specify the 47 V breakdown voltage for BZX384-C47-Q?

The nominal 47 V breakdown voltage is specified at a test current of 2 mA, as defined in Table 9 of the datasheet. This differs from the A- and B-tolerance variants (tested at 5 mA) and reflects the C-series' optimization for lower-current regulation applications such as bias networks and voltage monitoring circuits.

Can BZX384-C47-Q be used in parallel for higher power dissipation?

No - Zener diodes exhibit manufacturing variations in V_Z and dynamic resistance, causing current imbalance and thermal runaway when paralleled. For higher power needs, select a single higher-rated device like PZM4700 or use active regulation instead.

Is the SOD323 package suitable for automated optical inspection (AOI) after reflow?

Yes - the SOD323 package has a standardized 1.35 mm × 0.85 mm body with clear cathode marking bar, enabling reliable AOI detection per IPC-A-610 Class 2/3 standards when using Nexperia's recommended solder paste stencil and reflow profile.

How does the +0.05 mV/K temperature coefficient affect regulation accuracy over temperature?

At 47 V nominal, a +0.05 mV/K coefficient results in only +2.35 mV/°C drift - approximately +0.005 %/°C - meaning regulation shifts less than ±0.24 V over a 100 °C range (−40 °C to +60 °C), making it suitable for non-critical reference applications where absolute precision is secondary to reliability.

BZX384-C47-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:: ±5%

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-C47-QX FAQ

1.How can I place an order for BZX384-C47-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX384-C47-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-C47-QX reliable?

The price and inventory of BZX384-C47-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-C47-QX is usually 5 days.

3.What payment methods are accepted for BZX384-C47-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-C47-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX384-C47-QX?

BZX384-C47-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX384-C47-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-C47-QX?

For technical support, including BZX384-C47-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-C47-QX requirements.

6.How does Aetrix verify that BZX384-C47-QX is sourced from the original manufacturer or authorized distributors?

All BZX384-C47-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-C47-QX meets industry standards.

7.What is the process for return or replacement of BZX384-C47-QX?

All BZX384-C47-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-C47-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-C47-QX part is unused and in its original packaging.

Return procedure for BZX384-C47-QX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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