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Nexperia USA Inc. BZX384-B56-QX
- Part No.:
- BZX384-B56-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B56-QX.pdf
- Description:
- DIODE ZENER 56V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,577
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Product details
Overview
BZX384-B56-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 56 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-B56-QX datasheet, BZX384-B56-QX pinout, BZX384-B56-QX application, or BZX384-B56-QX equivalent, key selection criteria include its 56 V ±2 % Zener voltage tolerance, 425 Ω maximum differential resistance at IZ = 2 mA, 200 μA reverse current at VR = 44.8 V, -0.05 mV/K temperature coefficient, and non-repetitive peak reverse current of 0.3 A.
Technical Context
This device operates as a two-terminal shunt voltage reference, maintaining stable output voltage across load and line variations by conducting reverse current above its specified Zener breakdown threshold. It exhibits a negative temperature coefficient of –0.05 mV/K at IZ = 2 mA, indicating slight voltage reduction with rising junction temperature.
Designed for low-power regulation, it supports continuous operation up to 150 °C junction temperature and withstands non-repetitive 100 μs surges up to 40 W, with thermal resistance from junction to ambient of 415 K/W on standard FR4 PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V nominal at IZ = 2 mA; ±2 % tolerance ensures tight regulation in precision reference designs. |
| Differential Resistance (rdif) | ≤425 Ω at IZ = 2 mA; defines small-signal AC impedance affecting regulation stability under dynamic load. |
| Reverse Current (IR) | ≤200 μA at VR = 44.8 V; specifies leakage before breakdown, critical for low-power standby circuits. |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C; sets maximum continuous DC power handling on standard FR4 PCB. |
| Non-repetitive Peak Reverse Current (IZSM) | 0.3 A for tp = 100 μs; enables transient overvoltage clamping without device failure. |
| Junction Temperature (Tj) | –65 °C to +150 °C operating range; supports under-hood automotive environments and industrial control systems. |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package with 2 leads, 2.7 mm × 1.6 mm footprint, 0.45 mm typical height, and cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs. |
| 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-grade reliability including temperature cycling, humidity, and surge stress tests. |
| ±2 % Zener voltage tolerance | Enables tighter system-level voltage margining than ±5 % variants, reducing need for post-regulation trimming. |
| Low thermal resistance to solder point | Rth(j-sp) = 110 K/W allows effective heat transfer to PCB copper, improving sustained power capability. |
| Non-repetitive 40 W surge rating | Supports transient suppression in 12 V/24 V automotive supply lines without external TVS coordination. |
| Standard E24 voltage series | 56 V selection aligns with common automotive subsystem rails (e.g., engine control module references). |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 56 V reference for microcontroller ADC monitoring of high-side switch feedback in BCM power distribution units. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise threshold for overvoltage detection logic. Use Value: ±2 % tolerance ensures consistent trip point across temperature, eliminating calibration drift in production units. |
Use Scenario: Biasing op-amp input stages in 4–20 mA transmitter circuits requiring stable headroom above 48 V supply rails. IC Role / Device Role / Timing Role: Passive voltage clamp defining upper rail limit for analog front-end protection. Use Value: 425 Ω rdif minimizes loading error on high-impedance sensor outputs while maintaining regulation accuracy. |
| Automotive Infotainment Power Sequencing | LED Driver Overvoltage Protection |
Use Scenario: Generating enable thresholds for multi-rail DC-DC converters powering infotainment head units with 56 V backup battery interface. IC Role / Device Role / Timing Role: Zener-based voltage divider element setting precise turn-on voltage for PMIC sequencing logic. Use Value: AEC-Q101 qualification guarantees long-term stability under thermal cycling and vibration conditions. |
Use Scenario: Clamping transient spikes on constant-current LED driver outputs connected to long harnesses in commercial lighting systems. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing 100 μs surges up to 40 W without degradation. Use Value: 0.3 A IZSM rating matches typical surge currents in 48 V LED arrays, avoiding need for larger TVS devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B56-Q | Same electrical specs and AEC-Q101 qualification; differs only in marking code (N6 vs. QX) and packaging format (tape-and-reel variant). | No functional difference; identical use in automotive and industrial regulation circuits. | Select BZX384-B56-QX when sourcing requires specific reel labeling or traceability per customer logistics requirements. |
| MMSZ5256B-TP | 56 V ±5 % tolerance, 500 mW Ptot, no AEC-Q101 qualification; higher leakage (5 μA at 44.8 V) and rdif = 130 Ω. | Suitable for cost-sensitive consumer electronics but not automotive or high-reliability industrial use. | Choose MMSZ5256B-TP only for non-automotive applications where ±5 % tolerance and absence of automotive qualification are acceptable. |
Compared with BZX384-B56-QX, BZX384-B56-Q offers identical performance with alternate packaging, while MMSZ5256B-TP trades automotive reliability and tighter tolerance for higher power and lower cost-making it unsuitable for safety-critical or temperature-stable reference roles.
Availability
BZX384-B56-QX is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, infotainment power sequencing, and LED driver overvoltage protection requiring stable component supply with AEC-Q101 compliance.
Supply support for BZX384-B56-QX 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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX384-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for stable voltage reference and transient suppression in harsh-environment electronic control units.
FAQ
What is the maximum continuous reverse current this diode can handle at 56 V?
The BZX384-B56-QX is not rated for continuous conduction at its Zener voltage. Its maximum continuous reverse current is determined by its 300 mW power limit: at 56 V, that yields approximately 5.4 mA (300 mW ÷ 56 V). Exceeding this risks thermal runaway and permanent damage.
Does this part require a heatsink for standard PCB mounting?
No heatsink is required. With Rth(j-a) = 415 K/W on standard FR4 PCB and Ptot = 300 mW, the worst-case junction-to-ambient temperature rise is ~125 °C (300 mW × 415 K/W), keeping Tj within 150 °C limit at Tamb ≤ 25 °C. Adequate copper pour improves margin.
How does the temperature coefficient affect regulation accuracy over –40 °C to +125 °C?
With SZ = –0.05 mV/K at IZ = 2 mA, the Zener voltage shifts by –3.5 mV over a 70 K range (–40 °C to +125 °C), representing a ±0.006 % change relative to 56 V. This minimal drift supports stable reference performance without active compensation.
Can this diode replace older BZX384-B56 variants in existing designs?
Yes-BZX384-B56-QX is a direct replacement for legacy BZX384-B56 parts with identical electrical characteristics, SOD323 package dimensions, and AEC-Q101 qualification. The "QX" suffix denotes updated traceability and packaging per Nexperia's 2021 revision, with no design-in changes required.
BZX384-B56-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):
- 56 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 39.2 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-B56-QX FAQ
1.How can I place an order for BZX384-B56-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B56-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-B56-QX reliable?
The price and inventory of BZX384-B56-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-B56-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B56-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B56-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B56-QX?
BZX384-B56-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B56-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-B56-QX?
For technical support, including BZX384-B56-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B56-QX requirements.
6.How does Aetrix verify that BZX384-B56-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-B56-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-B56-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B56-QX?
All BZX384-B56-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B56-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-B56-QX part is unused and in its original packaging.
Return procedure for BZX384-B56-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B56-QX Tags
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Diodes Incorporated
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