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Nexperia USA Inc. BZX84W-B56-QX
- Part No.:
- BZX84W-B56-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B56-QX.pdf
- Description:
- DIODE ZENER 56V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,255
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Product details
Overview
BZX84W-B56-QX from Nexperia is a ±2% tolerance Zener voltage regulator diode with a nominal 56 V breakdown voltage, 425 Ω differential resistance at 2 mA, and 57.0 mV/K temperature coefficient, packaged in SOT323 (SC-70) for automotive-grade overvoltage clamping in power supply feedback loops.
For engineers reviewing the BZX84W-B56-QX datasheet, BZX84W-B56-QX pinout, BZX84W-B56-QX application, or BZX84W-B56-QX equivalent, this part supports precision voltage reference, transient suppression, and bias stabilization in space-constrained automotive ECUs and industrial sensor interfaces where AEC-Q101 qualification and low capacitance (0.3 pF) are required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable 56 V regulation across 0.5–2 mA test currents, with a positive temperature coefficient of +57.0 mV/K ensuring predictable drift under thermal stress. Its 425 Ω dynamic impedance defines load regulation sensitivity in shunt reference configurations.
The device sustains non-repetitive peak reverse power up to 40 W for 100 µs pulses and delivers 275 mW total power dissipation on FR4 PCBs. With 0.3 pF junction capacitance at 1 MHz and 0 V bias, it minimizes signal distortion in high-frequency clamp applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 54.9 V to 57.1 V at IZ = 2 mA - defines tight regulation window for 56 V nominal systems |
| Differential Resistance (rdif) | 425 Ω max at IZ = 2 mA - determines output voltage variation under load current changes |
| Temperature Coefficient (SZ) | +57.0 mV/K - quantifies voltage drift per degree Celsius rise in junction temperature |
| Junction Capacitance (Cd) | 0.3 pF at f = 1 MHz, VR = 0 V - enables minimal signal coupling in RF-sensitive clamp circuits |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - ensures low conduction loss when used in series forward paths |
| Peak Reverse Power (PZSM) | 40 W for tp = 100 µs - supports robust ESD/TVS-like transient absorption capability |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 - sets continuous thermal limit for PCB layout design |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, footprint dimensions 2.2 mm × 1.35 mm × 0.95 mm (L × W × H), optimized for automated reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally isolated terminal; must remain unconnected in PCB layout to avoid parasitic coupling |
| 3 | Cathode (K) | Reverse-bias terminal tied to regulated voltage node; carries Zener current during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood and body-control module use with extended temperature operation (−55 °C to +150 °C) |
| ±2% Zener tolerance (B-series) | Reduces calibration overhead in precision reference designs versus ±5% C-series variants |
| Low 0.3 pF junction capacitance | Minimizes high-frequency signal loading in RF detector or fast-switching clamp circuits |
| 40 W non-repetitive surge rating | Provides transient immunity without external TVS devices in 12 V/24 V automotive power rails |
| SOT323 ultra-small footprint | Enables placement in dense PCB areas such as CAN transceiver bias networks or MCU voltage monitor inputs |
Applications
| Automotive Power Rail Clamp | Industrial Sensor Bias Reference |
|---|---|
Use Scenario: Clamping 24 V battery line transients in engine control units during load dump events. IC Role / Device Role / Timing Role: Shunt Zener element absorbing surge energy above 56 V threshold while holding downstream regulator input within safe range. Use Value: Eliminates need for discrete TVS diodes by leveraging 40 W pulse rating and AEC-Q101 reliability in harsh environments. |
Use Scenario: Providing stable 56 V bias for high-voltage op-amp input stages in industrial current-sense amplifiers. IC Role / Device Role / Timing Role: Precision voltage reference source maintaining fixed common-mode level despite supply ripple. Use Value: ±2% tolerance and +57.0 mV/K coefficient enable predictable offset compensation across −40 °C to +125 °C operating range. |
| Programmable Overvoltage Detector | High-Frequency Signal Limiter |
Use Scenario: Threshold-setting element in comparator-based overvoltage protection circuits for telecom power supplies. IC Role / Device Role / Timing Role: Zener node defining trip voltage for monitoring circuit; triggers shutdown when input exceeds 56 V. Use Value: 425 Ω dynamic impedance ensures stable trip point independent of small variations in sense resistor values. |
Use Scenario: AC-coupled clipping in RF front-end receivers operating above 100 MHz. IC Role / Device Role / Timing Role: Low-capacitance limiter preventing amplifier saturation during large-signal bursts. Use Value: 0.3 pF capacitance avoids detuning matching networks while clamping peaks to ±56 V envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C56-Q | ±5% tolerance (52–60 V range) vs. ±2% (54.9–57.1 V); identical package, power, and thermal specs | Acceptable where system-level calibration compensates for wider voltage spread; lower cost | Select when absolute voltage accuracy is secondary to cost and footprint compatibility |
| MMSZ5255B-TP | 56 V nominal, ±5%, SOD-123 package (larger footprint), 500 mW Ptot, 300 Ω rdif | Higher power handling but lacks AEC-Q101 qualification; unsuitable for automotive deployment | Choose only for non-automotive industrial designs requiring higher continuous dissipation |
Compared with BZX84W-C56-Q, the BZX84W-B56-QX offers tighter voltage control critical for uncalibrated systems; versus MMSZ5255B-TP, it trades raw power for automotive qualification and board-space efficiency in SOT323.
Availability
BZX84W-B56-QX is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor biasing, programmable overvoltage detection, and high-frequency signal limiting requiring stable component supply with AEC-Q101 assurance.
Supply support for BZX84W-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 delivering high-performance logic, analog, and discrete components with focus on efficiency, reliability, and miniaturization.
The BZX84W-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for stable voltage regulation and transient suppression in space-constrained, thermally demanding automotive and industrial environments.
FAQ
What is the maximum continuous Zener current for BZX84W-B56-QX at 25 °C ambient?
The device supports up to 4.9 mA continuous Zener current at 25 °C ambient, calculated from its 275 mW total power dissipation rating divided by the nominal 56 V Zener voltage. Derating is required above 25 °C per the 455 K/W junction-to-ambient thermal resistance.
Can BZX84W-B56-QX replace a standard 1N4734A in an existing design?
No - the 1N4734A is a 56 V, 1 W through-hole Zener with TO-92 package and ±5% tolerance, whereas BZX84W-B56-QX is a ±2% SOT323 device rated at 275 mW. Direct replacement requires verifying thermal margin, PCB layout compatibility, and tolerance impact on regulation accuracy.
Is Pin 2 electrically functional or a mechanical dummy lead?
Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia datasheet and must remain unconnected in all applications. It serves only as a mechanical anchor for the SOT323 package and has no internal semiconductor connection.
How does the +57.0 mV/K temperature coefficient affect long-term stability in a 125 °C environment?
At 125 °C junction temperature, the Zener voltage increases by approximately 5.7 V relative to its 25 °C value (100 K × 57.0 mV/K), shifting the regulation point from 56 V to ~61.7 V. System-level compensation or derating must account for this predictable positive drift.
BZX84W-B56-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:
- ±1.96%
- 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-B56-QX FAQ
1.How can I place an order for BZX84W-B56-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-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 BZX84W-B56-QX reliable?
The price and inventory of BZX84W-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 BZX84W-B56-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B56-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B56-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B56-QX?
BZX84W-B56-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-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 BZX84W-B56-QX?
For technical support, including BZX84W-B56-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B56-QX requirements.
6.How does Aetrix verify that BZX84W-B56-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-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 BZX84W-B56-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B56-QX?
All BZX84W-B56-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-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 BZX84W-B56-QX part is unused and in its original packaging.
Return procedure for BZX84W-B56-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B56-QX Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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