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Nexperia USA Inc. BZX84W-C56-QX
- Part No.:
- BZX84W-C56-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C56-QX.pdf
- Description:
- DIODE ZENER 56V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,280
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Product details
Overview
BZX84W-C56-QX from Nexperia is a ±5 % tolerance Zener voltage regulator diode rated at 56 V nominal working voltage, housed in an SOT323 (SC-70) surface-mount package, with 275 mW total power dissipation and qualified to AEC-Q101 for automotive voltage reference and overvoltage protection functions.
For engineers reviewing the BZX84W-C56-QX datasheet, BZX84W-C56-QX pinout, BZX84W-C56-QX application, or BZX84W-C56-QX equivalent, this part serves as a precision 56 V shunt regulator in compact automotive ECUs, industrial sensor signal conditioning, and high-frequency power supply feedback loops where thermal stability and low capacitance are critical.
Technical Context
This Zener diode operates in reverse-bias breakdown mode to maintain a stable 56 V reference across its cathode-anode terminals under regulated current conditions (IZ = 2 mA). Its differential resistance is 425 Ω at IZ = 2 mA, and temperature coefficient is +57.0 mV/K at that bias point - indicating positive drift with junction temperature rise.
The device exhibits 40 pF junction capacitance at 1 MHz and 0 V reverse bias, enabling use in moderate-frequency regulation circuits. It supports non-repetitive peak reverse power dissipation up to 40 W for 100 µs pulses and withstands ambient temperatures from −55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 56 V - precise shunt regulation point at IZ = 2 mA, ±5 % tolerance (52.0 V to 60.0 V) |
| Differential Resistance | 425 Ω - small-signal dynamic impedance affecting regulation accuracy under load transients |
| Temperature Coefficient | +57.0 mV/K - predictable positive voltage drift per degree Celsius rise in junction temperature |
| Junction Capacitance | 40 pF @ 1 MHz, 0 V - limits high-frequency noise filtering and transient response bandwidth |
| Total Power Dissipation | 275 mW @ Tamb = 25 °C on FR4 PCB - defines maximum continuous DC or average pulsed power handling |
| Forward Voltage | ≤ 0.9 V @ IF = 10 mA - ensures low-loss conduction in forward-biased protection configurations |
| Reverse Current | 50 nA @ VR = 39.2 V (0.7 × VZnom) - specifies leakage level near but below breakdown threshold |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, footprint optimized for reflow soldering per Nexperia's recommended land pattern (2.65 mm × 2.35 mm body, 0.65 mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-bias terminal; connects to lower-potential node in shunt regulation configuration |
| 2 | Not Connected (n.c.) | Electrically isolated internal pad; no circuit function or routing required |
| 3 | Cathode (K) | Reverse-bias terminal; connects to higher-potential node and regulates voltage by sinking current to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| ±5 % Zener voltage tolerance | Enables cost-effective selection for applications where tight regulation is not mission-critical |
| Low junction capacitance (40 pF) | Minimizes signal coupling and phase shift in feedback paths of switching regulators |
| High surge capability (40 W, 100 µs) | Withstands transient overvoltage events such as load dump or inductive kickback |
| SOT323 ultra-small footprint | Reduces PCB area by >50 % vs. SOD-323 while maintaining thermal performance on standard FR4 |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for microcontroller ADC inputs monitoring battery voltage and lamp status in BCMs. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 56 V rail for overvoltage detection circuitry. Use Value: Enables accurate fault detection above 52 V while surviving automotive load-dump transients up to 40 W. | Use Scenario: Clamping and referencing analog output signals from 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Precision Zener clamp limiting signal swing to protect downstream op-amps and ADCs. Use Value: Maintains 56 V compliance voltage with <425 Ω dynamic impedance, ensuring minimal signal distortion during field wiring faults. |
| Switch-Mode Power Supply Feedback | Telecom Line Interface Protection |
Use Scenario: Providing secondary-side voltage reference in isolated flyback converters for telecom adapters. IC Role / Device Role / Timing Role: Zener-based optocoupler bias reference setting output regulation setpoint. Use Value: Delivers stable 56 V reference with +57 mV/K TC, allowing predictable compensation of transformer turns-ratio drift over temperature. | Use Scenario: Overvoltage protection on subscriber line interface cards (SLIC) exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-acting shunt protector clamping line voltage before damage to line driver ICs. Use Value: Absorbs 40 W non-repetitive surges with 100 µs pulse width, meeting GR-1089-CORE Level 3 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-B56-Q | ±2 % tolerance (54.9 V–57.1 V), lower rdif (400 Ω), same package and thermal specs | Better regulation accuracy for precision references; higher cost and tighter inventory control | Select when ±2 % VZ stability is required over temperature and life, especially in closed-loop feedback |
| MMSZ5256ET1G | ±5 % tolerance (53.2 V–58.8 V), SOD-123 package, 500 mW Ptot, higher Cd (60 pF) | Larger footprint, higher power rating, but reduced HF performance due to capacitance | Choose for legacy board compatibility or higher continuous power needs where space permits |
Compared with BZX84W-C56-QX, the BZX84W-B56-Q offers tighter voltage control at the expense of cost and availability, while the MMSZ5256ET1G trades miniaturization for higher power and lower frequency suitability - making the C56-QX optimal for space-constrained automotive and high-frequency regulation.
Availability
BZX84W-C56-QX is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and switch-mode power supply feedback circuits requiring stable component supply, AEC-Q101 compliance, and SOT323 footprint consistency.
Supply support for BZX84W-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 expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for voltage reference, overvoltage clamping, and regulation in harsh-environment automotive and industrial systems.
FAQ
What is the maximum continuous reverse current the BZX84W-C56-QX can sustain without exceeding its power limit?
At Tamb = 25 °C on a standard FR4 PCB, the BZX84W-C56-QX sustains up to 4.9 mA continuous reverse current (IZ = Ptot / VZ ≈ 275 mW / 56 V) before reaching its 275 mW total power dissipation limit. Derating is required above 25 °C per the 455 K/W junction-to-ambient thermal resistance.
Does the 'n.c.' pin (pin 2) require PCB trace routing or grounding?
No - pin 2 is internally not connected and electrically isolated. It must remain unconnected on the PCB; no trace, solder mask opening, or thermal pad is required. Routing or grounding this pin may cause mechanical stress or unintended parasitic coupling.
How does the +57.0 mV/K temperature coefficient affect regulation accuracy over temperature?
At IZ = 2 mA, the BZX84W-C56-QX exhibits +57.0 mV/K drift - meaning its Zener voltage increases by ~57 mV per °C rise in junction temperature. From −40 °C to +125 °C, this results in ~9.4 V total shift (165 °C × 57 mV/K), requiring system-level compensation if sub-1 % absolute accuracy is needed.
Can BZX84W-C56-QX replace older BZX84-C56 variants in existing designs?
Yes - BZX84W-C56-QX maintains identical electrical specifications, SOT323 pinout, and marking (U6%) as legacy BZX84-C56 parts, but adds AEC-Q101 qualification and improved thermal performance via optimized die attach. No layout or schematic changes are required for drop-in replacement.
BZX84W-C56-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W-Q
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±7.14%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 39.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-C56-QX FAQ
1.How can I place an order for BZX84W-C56-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-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 BZX84W-C56-QX reliable?
The price and inventory of BZX84W-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 BZX84W-C56-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-C56-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C56-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C56-QX?
BZX84W-C56-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-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 BZX84W-C56-QX?
For technical support, including BZX84W-C56-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C56-QX requirements.
6.How does Aetrix verify that BZX84W-C56-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-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 BZX84W-C56-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-C56-QX?
All BZX84W-C56-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-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 BZX84W-C56-QX part is unused and in its original packaging.
Return procedure for BZX84W-C56-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C56-QX Tags
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MM5Z5V1ST1G
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