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Nexperia USA Inc. BZX384-A56-QX
- Part No.:
- BZX384-A56-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A56-QX.pdf
- Description:
- DIODE ZENER 56V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:1,601
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Product details
Overview
BZX384-A56-Q from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 56 V nominal breakdown voltage at 2 mA test current, 400 Ω maximum differential resistance, and 300 mW total power dissipation. It operates across −65 °C to +150 °C ambient range and is AEC-Q101 qualified for automotive voltage reference and overvoltage protection circuits.
For engineers reviewing the BZX384-A56-Q datasheet, BZX384-A56-Q pinout, BZX384-A56-Q application, or BZX384-A56-Q equivalent, this part serves as a precision low-power shunt regulator in ECU power rails, sensor biasing networks, and analog front-end clamping where tight voltage tolerance and automotive-grade reliability are required.
Technical Context
This Zener diode functions as a two-terminal shunt voltage reference, maintaining stable reverse-biased conduction above its specified 56 V breakdown threshold. Its ±1 % tolerance ensures minimal unit-to-unit variation in regulation setpoint, critical for consistent analog signal conditioning in automotive modules.
Designed for surface-mount operation on FR4 PCBs with standard SOD323 footprint, it delivers 40 W non-repetitive peak reverse power handling under 100 μs pulses and exhibits a positive temperature coefficient of +39.2 mV/K at IZ = 2 mA, enabling predictable thermal drift compensation in multi-device references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZ) | 55.44 V to 56.56 V at IZ = 2 mA - defines precise regulation setpoint for feedback loops and voltage clamping |
| Tolerance | ±1 % - enables high-accuracy voltage referencing without post-production trimming |
| Differential Resistance (rdif) | ≤425 Ω at IZ = 2 mA - determines load regulation error under varying current draw |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 board |
| Non-repetitive Peak Reverse Power | 40 W for tp = 100 μs - supports transient surge suppression in automotive load-dump scenarios |
| Junction Temperature Range | −65 °C to +150 °C - validated for under-hood automotive environments and industrial control cabinets |
| AEC-Q101 Qualified | Yes - certified for automotive discrete semiconductor stress testing including HTGB, HTRB, and temperature cycling |
Pinout & Package
Package: SOD323 (SC-76), 2-pin surface-mount plastic package with cathode-marked end. Dimensions: 1.8 mm × 1.35 mm × 0.95 mm (L × W × H), 0.45 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-bias polarity must be observed for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant - meets stress-test requirements for engine control, body electronics, and ADAS modules |
| Precision voltage reference | ±1 % tolerance at 56 V - reduces calibration overhead in safety-critical sensor interfaces |
| Thermal stability | +39.2 mV/K temperature coefficient - enables predictable drift behavior for compensated reference designs |
| Transient robustness | 40 W non-repetitive peak reverse power - withstands ISO 7637-2 pulse 5a load-dump transients without failure |
| Low-profile packaging | SOD323 footprint - fits high-density automotive PCB layouts while maintaining thermal performance via solder-point conduction |
Applications
| Engine Control Unit (ECU) Reference | Automotive Sensor Biasing |
|---|---|
Use Scenario: Providing stable 56 V reference for ADC input scaling and microcontroller supply monitoring in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Shunt voltage reference establishing absolute measurement baseline for fuel injection timing and knock detection circuits. Use Value: ±1 % tolerance ensures <1.5 LSB error in 12-bit engine parameter digitization across full temperature range. |
Use Scenario: Biasing piezoresistive pressure sensors in brake master cylinders and turbocharger manifolds. IC Role / Device Role / Timing Role: Precision voltage clamp limiting sensor excitation voltage to prevent overrange saturation during cold cranking. Use Value: 425 Ω differential resistance minimizes current-induced offset drift under dynamic load conditions. |
| Infotainment Power Rail Clamping | Body Control Module (BCM) Overvoltage Protection |
Use Scenario: Protecting audio amplifier ICs and display drivers from 12 V battery line transients in head units. IC Role / Device Role / Timing Role: Fast-acting shunt limiter clamping supply rail to 56 V during ISO 7637-2 pulse 1 and pulse 2a events. Use Value: 40 W peak power rating absorbs 100 μs surges without degradation, preserving downstream component lifetime. |
Use Scenario: Safeguarding LIN bus transceivers and LED driver ICs against alternator overvoltage in door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary overvoltage protection element diverting excess energy to ground before reaching sensitive logic inputs. Use Value: AEC-Q101 qualification guarantees operational integrity after 1000+ thermal cycles between −40 °C and +125 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B56-Q | ±2 % tolerance, 425 Ω rdif, same 56 V nominal VZ | Acceptable where tighter regulation not required; lower cost per unit | Select when system-level calibration compensates for wider tolerance band |
| MMSZ5255B-TP | ±5 % tolerance, 500 Ω rdif, 56 V nominal VZ, SOD-123 package | Larger footprint; not AEC-Q101 qualified | Use only in non-automotive industrial or consumer applications with relaxed reliability requirements |
Compared with BZX384-B56-Q and MMSZ5255B-TP, the BZX384-A56-Q provides superior voltage accuracy and automotive qualification-critical for closed-loop control systems where uncorrected drift directly impacts emissions compliance and functional safety metrics.
Availability
BZX384-A56-Q is available at Aetrix Electronics and suitable for automotive ECU design, sensor interface development, and body electronics production requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX384-A56-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 high-volume, high-reliability logic, discrete, and MOSFET devices, headquartered in Nijmegen, Netherlands.
The BZX384-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for precision voltage regulation and transient protection in harsh-environment vehicle subsystems.
FAQ
What is the recommended test current for measuring VZ on BZX384-A56-Q?
The datasheet specifies 2 mA as the standard test current for VZ measurement. This value balances sufficient conduction for stable reading against self-heating effects in the SOD323 package. Using 5 mA-as applied to lower-voltage variants-is not valid for this 56 V part due to increased power dissipation and thermal drift.
Can BZX384-A56-Q be used in parallel for higher power handling?
No-Zener diodes exhibit negative temperature coefficients below ~5 V and positive above, but even within the same batch, minor VZ mismatches cause current hogging. Parallel operation risks thermal runaway and premature failure; use a single higher-rated device or external current-sharing resistors if >300 mW is needed.
How does the +39.2 mV/K temperature coefficient affect circuit performance?
This positive coefficient means VZ increases by ~39.2 mV per Kelvin rise in junction temperature. In a 56 V reference, that equates to ~0.07 %/°C drift-significant in wide-temperature-range automotive applications. Compensation requires either matched-component networks or digital calibration routines.
Is the SOD323 package compatible with standard reflow profiles?
Yes-the SOD323 outline is fully compatible with IPC/JEDEC J-STD-020D-compliant lead-free reflow profiles. The recommended footprint uses 0.5 mm wide solder lands with 0.6 mm spacing (Fig. 12), and thermal resistance from junction to solder point is 110 K/W, supporting reliable thermal transfer during assembly.
BZX384-A56-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:
- ±1%
- 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-A56-QX FAQ
1.How can I place an order for BZX384-A56-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A56-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-A56-QX reliable?
The price and inventory of BZX384-A56-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-A56-QX is usually 5 days.
3.What payment methods are accepted for BZX384-A56-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A56-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A56-QX?
BZX384-A56-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A56-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-A56-QX?
For technical support, including BZX384-A56-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A56-QX requirements.
6.How does Aetrix verify that BZX384-A56-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-A56-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-A56-QX meets industry standards.
7.What is the process for return or replacement of BZX384-A56-QX?
All BZX384-A56-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A56-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-A56-QX part is unused and in its original packaging.
Return procedure for BZX384-A56-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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