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Nexperia USA Inc. BZX384-C51-QX
- Part No.:
- BZX384-C51-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-C51-QX.pdf
- Description:
- DIODE ZENER 51V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,195
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Product details
Overview
BZX384-C51-QX from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 51 V nominal breakdown voltage at 2 mA, 400 Ω maximum differential resistance, and 180 μA reverse current at 38.8 V, designed for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the BZX384-C51-QX datasheet, BZX384-C51-QX pinout, BZX384-C51-QX application, or BZX384-C51-QX equivalent, key selection criteria include its AEC-Q101 qualification, 300 mW total power dissipation at 25 °C ambient, non-repetitive peak reverse power handling up to 40 W, and thermal resistance of 110 K/W from junction to solder point.
Technical Context
This device operates in reverse-biased Zener breakdown mode with a temperature coefficient of +0.05 mV/K at IZ = 2 mA, enabling stable regulation across automotive temperature ranges (−65 °C to +150 °C). Its low 400 Ω dynamic impedance ensures minimal output voltage variation under load changes.
The diode exhibits 50 pF capacitance at 1 MHz and 0 V reverse bias, supporting fast transient response in feedback loops. Its 150 °C maximum junction temperature and qualified AEC-Q101 stress testing confirm suitability for under-hood automotive electronics requiring long-term reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 51 V nominal at IZ = 2 mA; actual range 48 V to 54 V per ±5 % tolerance - sets precise clamping threshold for 48 V systems. |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 PCB - defines continuous DC power handling without derating. |
| Differential Resistance | 400 Ω max at IZ = 2 mA - determines regulation stiffness: ΔVZ ≈ 400 Ω × ΔIZ for small-signal stability. |
| Reverse Current | 180 μA max at VR = 38.8 V - specifies leakage level below breakdown, critical for low-power standby circuits. |
| Non-repetitive Peak Power | 40 W for tp = 100 μs - enables robust ESD/surge suppression in CAN/LIN bus interfaces. |
| Junction Temperature | 150 °C max - supports operation in engine control units and body electronics with high ambient heat. |
| Thermal Resistance | 110 K/W from junction to cathode solder point - guides PCB copper area design for thermal management. |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package with 2 leads; cathode marked by bar on top surface; 2.7 mm × 1.6 mm footprint; 0.45 mm typical height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity marker aligns with PCB silkscreen bar for automated assembly verification. |
| 2 | Anode (A) | Ground or lower-potential reference; requires minimum 0.5 mm solder land per Nexperia reflow footprint guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and ESD tests - eliminates need for additional qualification effort in Tier-1 designs. |
| ±5 % voltage tolerance | Loosest tolerance tier in BZX384-Q series - balances cost and performance for non-critical biasing and clamping functions. |
| 40 W surge capability | Supports ISO 7637-2 Pulse 1/2a/3a immunity without external TVS - reduces BOM count in 12/24/48 V vehicle networks. |
| Low 50 pF capacitance | Minimizes signal distortion in high-frequency feedback paths - suitable for switching regulator error amplifiers and ADC reference buffers. |
| SOD323 package | 0.65 mm pitch, 2.7 mm × 1.6 mm footprint - enables dense placement in space-constrained ADAS sensor modules and infotainment power supplies. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Clamping 48 V supply rail transients during load dump events in door module ECUs. IC Role / Device Role / Timing Role: Zener shunt regulator providing overvoltage protection for microcontroller I/O and CAN transceiver power domains. Use Value: 40 W non-repetitive peak power rating absorbs 100 μs surges without degradation, maintaining system uptime per ISO 16750-2. |
Use Scenario: Protecting 24 V analog input front-end against field-wiring faults and induced surges. IC Role / Device Role / Timing Role: Precision voltage clamp limiting input to 51 V before op-amp buffer stage. Use Value: 400 Ω differential resistance ensures <100 mV output shift across 100 μA sensor current variations, preserving measurement accuracy. |
| Automotive Infotainment Power Sequencing | Medical Equipment Reference Biasing |
Use Scenario: Generating stable 51 V bias for backlight LED driver IC enable logic in head unit displays. IC Role / Device Role / Timing Role: Voltage reference source feeding comparator hysteresis network during cold-cranking conditions. Use Value: +0.05 mV/K temperature coefficient yields only ±0.75 mV drift from −40 °C to +125 °C, ensuring reliable startup sequencing. |
Use Scenario: Providing isolated 51 V reference for high-voltage patient monitoring sensor biasing circuits. IC Role / Device Role / Timing Role: Low-leakage Zener establishing calibration point for 16-bit SAR ADC reference divider. Use Value: 180 μA max IR at 38.8 V prevents >10 nA error current injection into precision resistor networks, preserving 0.01 % linearity. |
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-B51-Q | ±2 % tolerance (49.98 V–52.02 V), 200 Ω max rdif, 100 μA IR at 38.8 V | Higher precision required for feedback loop references in DC-DC converters | Select when tighter regulation and lower dynamic impedance outweigh cost sensitivity. |
| MMSZ5255B-TP | ±5 % tolerance (48.45 V–53.55 V), 500 Ω max rdif, 100 μA IR at 38.8 V, SOD-123 package | Legacy board redesign where SOD-123 footprint compatibility is mandatory | Choose only if existing PCB layout prohibits SOD323 component placement. |
Compared with BZX384-B51-Q, this part trades regulation accuracy and impedance for lower cost and higher surge margin; versus MMSZ5255B-TP, it offers superior thermal resistance (110 vs. 300 K/W) and AEC-Q101 validation, making it preferable for new automotive designs.
Availability
BZX384-C51-QX is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC analog protection, infotainment power sequencing, and medical sensor biasing requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for BZX384-C51-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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BZX384-Q series targets automotive-grade Zener regulation, engineered specifically to meet AEC-Q101 stress requirements while delivering tight tolerances and robust surge immunity in miniature SMD packages.
FAQ
What is the maximum continuous reverse current this diode can handle?
The BZX384-C51-QX has no specified maximum continuous reverse current; its safe operating limit is defined by power dissipation. At 25 °C ambient, it sustains 5.88 mA (300 mW ÷ 51 V) continuously. Derating is required above 25 °C per the 415 K/W junction-to-ambient thermal resistance.
Does this part support wave soldering?
Yes - Nexperia provides dedicated wave soldering footprint data (Fig. 13) for SOD323, specifying 2.75 mm transport direction length, 1.2 mm solder land width, and 1.5 mm solder resist clearance. Thermal profiling must stay within JEDEC J-STD-020 moisture sensitivity level 1 limits.
How does the temperature coefficient affect regulation accuracy over automotive temperature range?
With a +0.05 mV/K coefficient at IZ = 2 mA, the breakdown voltage shifts +3.75 mV from −40 °C to +125 °C (165 K × 0.05 mV/K), resulting in a total variation of ±0.0074 % of 51 V - negligible for clamping but relevant for precision reference use cases.
Is the marking code 'DT' confirmed for BZX384-C51-QX?
Yes - Table 4 explicitly lists BZX384-C51-Q with marking code 'DT'. This two-character laser mark appears adjacent to the cathode bar on the SOD323 package top surface and is verified per Nexperia's standard marking specification for Q-series devices.
BZX384-C51-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):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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-C51-QX FAQ
1.How can I place an order for BZX384-C51-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-C51-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-C51-QX reliable?
The price and inventory of BZX384-C51-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-C51-QX is usually 5 days.
3.What payment methods are accepted for BZX384-C51-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-C51-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-C51-QX?
BZX384-C51-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-C51-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-C51-QX?
For technical support, including BZX384-C51-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-C51-QX requirements.
6.How does Aetrix verify that BZX384-C51-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-C51-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-C51-QX meets industry standards.
7.What is the process for return or replacement of BZX384-C51-QX?
All BZX384-C51-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-C51-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-C51-QX part is unused and in its original packaging.
Return procedure for BZX384-C51-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-C51-QX Tags
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