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Nexperia USA Inc. BZX384-C56-QX
- Part No.:
- BZX384-C56-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-C56-QX.pdf
- Description:
- DIODE ZENER 56V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,167
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Product details
Overview
BZX384-C56-QX from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 56 V nominal breakdown voltage at 2 mA, 425 Ω maximum differential resistance, and 200 μA reverse current at 44.8 V, used for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the BZX384-C56-QX datasheet, BZX384-C56-QX pinout, BZX384-C56-QX application, or BZX384-C56-QX equivalent, key selection criteria include its AEC-Q101 qualification, 300 mW total power dissipation, non-repetitive peak reverse power handling up to 40 W, and thermal resistance of 415 K/W in free air.
Technical Context
This Zener diode operates in reverse-bias breakdown mode with a specified 56 V working voltage at IZ = 2 mA, exhibiting a temperature coefficient of +0.05 mV/K and diode capacitance of 63.8 pF at 1 MHz and 0 V reverse bias. Its differential resistance remains ≤425 Ω under regulation conditions.
The device supports surge immunity via 40 W non-repetitive peak reverse power dissipation (tp = 100 μs), and maintains stable operation across −65 °C to +150 °C ambient range with junction temperature limited to 150 °C. It is qualified per AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 56 V nominal at IZ = 2 mA; ±5 % tolerance ensures predictable clamping in 12 V/24 V automotive systems |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C; defines continuous DC regulation capability on standard FR4 PCB |
| Differential Resistance | ≤425 Ω at IZ = 2 mA; determines output impedance and regulation stiffness under load variation |
| Reverse Current | 200 μA max at VR = 44.8 V; sets leakage-related error budget in high-impedance reference circuits |
| Non-repetitive Peak Power | 40 W for 100 μs pulses; enables transient overvoltage suppression without failure |
| Junction Temperature | 150 °C max; constrains thermal design margin when mounted on compact automotive PCBs |
| AEC-Q101 Qualified | Yes; certified for automotive applications including engine control units and body electronics |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 2.3 mm × 1.35 mm footprint, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity marking aligns with PCB silkscreen bar |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant - validated for under-hood and chassis-mounted electronics |
| Stable voltage reference | 56 V ±5 % tolerance at 2 mA - suitable for ECU supply monitoring and battery-sense thresholds |
| Low thermal resistance | Rth(j-sp) = 110 K/W to cathode solder point - improves power handling in thermally constrained layouts |
| Pulse robustness | Withstands 40 W surges (100 μs) - protects downstream circuitry from load-dump transients |
| Small-footprint packaging | SOD323 outline (2.3 × 1.35 mm) - enables dense placement in space-constrained ADAS modules |
Applications
| Engine Control Unit (ECU) Supply Monitoring | Automotive Infotainment Power Rail Clamping |
|---|---|
|
Use Scenario: Monitors 12 V battery-derived supply in engine control modules to detect undervoltage or overvoltage faults. IC Role / Device Role / Timing Role: Zener diode provides fixed 56 V reference for comparator input against scaled battery voltage. Use Value: Enables detection of >16 V transients before they damage 3.3 V microcontroller power domains. |
Use Scenario: Limits voltage spikes on 5 V USB-powered infotainment subsystems during ignition switching. IC Role / Device Role / Timing Role: Acts as shunt clamp to divert surge current away from LDO regulators and USB PHYs. Use Value: Absorbs 40 W transient energy within 100 μs, preventing brownout resets during cold-cranking events. |
| Body Control Module (BCM) Sensor Reference | ADAS Camera Module Overvoltage Protection |
|
Use Scenario: Supplies stable reference voltage for analog sensor signal conditioning in door module microcontrollers. IC Role / Device Role / Timing Role: Provides low-drift 56 V reference for ADC biasing and ratiometric scaling circuits. Use Value: Maintains <±0.5 % reference stability over −40 °C to +125 °C due to AEC-Q101 thermal validation. |
Use Scenario: Protects 12 V input stage of rear-view camera modules from ISO 7637-2 pulse 5a load dump. IC Role / Device Role / Timing Role: Functions as primary shunt limiter upstream of DC-DC converter input filter. Use Value: Survives repeated 40 V/100 ms surges without parameter shift, verified per AEC-Q101 stress testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B56-Q | ±2 % tolerance (vs. ±5 %); tighter VZ distribution but higher cost | Preferred where reference accuracy dominates cost sensitivity, e.g., calibration circuits | Select when 56 V regulation must hold within ±1.12 V over full temperature range |
| MMSZ5256B-TP | Same 56 V nominal, ±5 %, but SOD-123 package; Rth(j-a) = 500 K/W (vs. 415 K/W) | Lower power density; unsuitable for sustained 300 mW operation on small PCB areas | Choose only if legacy SOD-123 footprint compatibility is mandatory and thermal headroom exists |
Compared with BZX384-B56-Q, the C-grade offers cost-effective tolerance for clamping; compared with MMSZ5256B-TP, it delivers superior thermal performance in space-constrained automotive layouts.
Availability
BZX384-C56-QX is available at Aetrix Electronics and suitable for automotive ECU design, infotainment power management, and ADAS camera protection requiring stable component supply with AEC-Q101 assurance.
Supply support for BZX384-C56-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 manufacturer headquartered in Nijmegen, Netherlands, specializing in high-volume logic, discrete, and MOSFET solutions with focus on automotive and industrial reliability.
The BZX384-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for voltage regulation and transient suppression in harsh automotive environments.
FAQ
What is the maximum continuous reverse current this diode can handle?
The BZX384-C56-QX has a maximum forward current rating of 250 mA, but its continuous reverse (Zener) current is limited by power dissipation: at 56 V, IZ must stay ≤5.36 mA to remain within 300 mW at 25 °C ambient. Derating applies above 25 °C per Rth(j-a) = 415 K/W.
Does this part support reflow soldering, and what footprint is required?
Yes, BZX384-C56-QX is qualified for lead-free reflow soldering. The recommended footprint matches the SOD323 outline: 0.6 mm pad width, 1.15 mm pad length, 2.1 mm center-to-center spacing, with solder mask defined lands per Nexperia's Fig. 12 layout guidance.
How does the temperature coefficient affect regulation accuracy over automotive temperature range?
With a specified SZ of +0.05 mV/K, the 56 V breakdown shifts by +1.25 mV/°C. Over −40 °C to +125 °C, total drift is ±81.25 mV - well within ±5 % (±2.8 V) tolerance band, ensuring functional stability in engine bay and cabin applications.
Can this diode be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients below ~5 V and positive above, but BZX384-C56-QX has +0.05 mV/K, making parallel operation unstable due to thermal runaway risk. Use single-device derating or external current-sharing resistors if higher power is needed.
BZX384-C56-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:
- ±5%
- 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-C56-QX FAQ
1.How can I place an order for BZX384-C56-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-C56-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-C56-QX reliable?
The price and inventory of BZX384-C56-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-C56-QX is usually 5 days.
3.What payment methods are accepted for BZX384-C56-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-C56-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-C56-QX?
BZX384-C56-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-C56-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-C56-QX?
For technical support, including BZX384-C56-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-C56-QX requirements.
6.How does Aetrix verify that BZX384-C56-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-C56-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-C56-QX meets industry standards.
7.What is the process for return or replacement of BZX384-C56-QX?
All BZX384-C56-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-C56-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-C56-QX part is unused and in its original packaging.
Return procedure for BZX384-C56-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-C56-QX Tags
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