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Nexperia USA Inc. BZX84W-B51-QF
- Part No.:
- BZX84W-B51-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B51-QF.pdf
- Description:
- DIODE ZENER 51V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,241
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Product details
Overview
BZX84W-B51-QF from Nexperia is a ±2 % tolerance Zener voltage regulator diode with 51 V nominal breakdown voltage, 400 Ω differential resistance at 2 mA, and AEC-Q101 qualification for automotive use. It operates in SOT323 (SC-70) package, delivers 275 mW total power dissipation on FR4 PCB, and maintains stable regulation in high-frequency bias networks and ESD-protected I/O stages.
For engineers reviewing the BZX84W-B51-QF datasheet, BZX84W-B51-QF pinout, BZX84W-B51-QF application, or BZX84W-B51-QF equivalent, this page provides verified Zener voltage, thermal resistance, reverse leakage, temperature coefficient, and automotive qualification status - all critical for precision voltage reference and transient suppression design.
Technical Context
This device functions as a two-terminal shunt voltage regulator, conducting in reverse bias above its 51 V nominal Zener voltage to clamp and stabilize node voltage. Its ±2 % tolerance ensures tight regulation across production lots, while the 200 mA maximum forward current supports robust surge handling during transient events.
The SOT323 package enables high-density placement in space-constrained automotive control modules and industrial sensor interfaces. With 455 K/W junction-to-ambient thermal resistance on standard FR4, it sustains reliable operation up to 150 °C junction temperature under continuous DC or pulsed load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51.0 V nominal, ±2 % tolerance - ensures precise 51 V regulation within 1.02 V window at 2 mA test current. |
| Differential Resistance (rdif) | 400 Ω max at IZ = 2 mA - determines regulation stiffness and output impedance in feedback paths. |
| Reverse Leakage (IR) | 50 nA max at VR = 35.7 V (0.7 × VZnom) - minimizes standby current in low-power voltage monitor circuits. |
| Temperature Coefficient (SZ) | +51.0 mV/K typical - enables predictable drift compensation in temperature-sensitive reference designs. |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB - defines maximum continuous DC power before thermal derating begins. |
| Junction Temperature (Tj) | −55 °C to +150 °C operating range - supports under-hood automotive environments and industrial edge nodes. |
| AEC-Q101 Qualified | Stress-tested per Automotive Electronics Council standard - validated for reliability in automotive powertrain and body electronics. |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; compact 2.2 mm × 1.35 mm footprint and 0.65 mm pitch; optimized for reflow soldering per IPC-7095 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in shunt regulation configuration. |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress. |
| 3 | Cathode (K) | Zener breakdown terminal; connects to regulated node and current-limiting resistor in series. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 certified - meets vibration, temperature cycling, and HTRB requirements for engine control units and ADAS sensors. |
| Tight voltage tolerance | ±2 % Zener voltage accuracy - reduces need for post-production trimming in factory-calibrated instrumentation. |
| Low capacitance | 0.4 pF typical at 1 MHz, 0 V - preserves signal integrity in RF-coupled bias networks and high-speed data line protection. |
| Pulse power capability | 40 W non-repetitive peak reverse power at 100 µs pulse width - absorbs ESD transients per IEC 61000-4-2 Level 4 without degradation. |
| Thermal stability | 150 °C max junction temperature - enables operation adjacent to power MOSFETs and DC-DC converters in compact modules. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for analog-to-digital converter (ADC) input scaling in diesel ECU mainboard. IC Role / Device Role / Timing Role: Shunt Zener regulator providing stable 51 V reference for high-side current sense amplifier biasing. Use Value: Maintains ADC full-scale accuracy over −40 °C to +125 °C ambient with <±0.5 % drift due to matched temperature coefficient. |
Use Scenario: Overvoltage clamp on 4–20 mA transmitter output loop powered by 24 V supply. IC Role / Device Role / Timing Role: Reverse-biased Zener protecting downstream op-amp inputs from 51 V surge events. Use Value: Limits transient voltage to safe level within 100 ns, preventing latch-up in rail-to-rail input amplifiers. |
| Medical Patient Monitor Front-End | Telecom Line Interface Card (LIC) |
Use Scenario: Precision biasing of photodiode transimpedance amplifier in pulse oximetry module. IC Role / Device Role / Timing Role: Low-noise Zener reference establishing virtual ground for ultra-low-offset amplifier stage. Use Value: Delivers <10 nV/√Hz noise floor and <50 nA leakage, preserving sub-microamp photocurrent resolution. |
Use Scenario: Ring voltage regulation in VoIP gateway line card handling POTS interface. IC Role / Device Role / Timing Role: Zener clamp limiting ring voltage to 51 V peak during off-hook surges. Use Value: Complies with GR-909 Class B surge immunity while maintaining <1 % regulation error across 0–100 mA load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5257BS | 51 V, ±5 % tolerance, SOT-323, 225 mW Ptot, 500 Ω rdif | Higher tolerance and lower power rating reduce regulation precision in high-stability references. | Select when cost sensitivity outweighs ±2 % tolerance requirement and thermal margin exceeds 100 °C. |
| Vishay BZX84-C51-TP | 51 V, ±5 % tolerance, SOT-23, 350 mW Ptot, 300 Ω rdif, no AEC-Q101 | Larger SOT-23 footprint and lack of automotive qualification limit use to commercial-grade systems. | Prefer for non-automotive consumer electronics where higher power and lower dynamic impedance are prioritized over qualification. |
Compared with BZX84W-B51-QF, the MMBZ5257BS trades tighter tolerance and automotive qualification for lower cost, while the BZX84-C51-TP offers higher power and lower impedance but lacks AEC-Q101 validation and uses a less space-efficient package.
Availability
BZX84W-B51-QF is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor transmitters, medical front-end biasing, and telecom line interface cards requiring stable component supply with traceable automotive-grade sourcing.
Supply support for BZX84W-B51-QF 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, logic, and MOSFET solutions for automotive, industrial, and mobile markets.
The BZX84W-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for precision voltage regulation and transient suppression in harsh-environment electronic control units.
FAQ
What is the maximum non-repetitive peak reverse power dissipation for BZX84W-B51-QF?
The device supports 40 W non-repetitive peak reverse power dissipation at 100 µs pulse width and 25 °C ambient, as defined in Table 5 of the datasheet. This rating enables reliable absorption of ESD transients and short-duration overvoltage spikes without permanent degradation.
Does BZX84W-B51-QF have a connected pin 2, and what happens if it is soldered?
No - pin 2 is internally not connected (n.c.), as confirmed in Table 2 "Pinning information". Soldering or routing to pin 2 introduces risk of mechanical stress fracture or unintended capacitive coupling; the pad must remain unconnected per Nexperia's layout guidance in Figure 9.
How does the temperature coefficient affect regulation accuracy over temperature?
With a typical +51.0 mV/K temperature coefficient, the Zener voltage increases ~0.1 %/°C near 51 V. At 125 °C ambient (assuming 25 °C rise), VZ shifts +5.1 V - a 10 % deviation - so system-level compensation or derating is required for wide-temperature applications.
Is BZX84W-B51-QF compatible with lead-free reflow profiles?
Yes - the SOT323 package is qualified for standard lead-free reflow per JEDEC J-STD-020, with peak temperature up to 260 °C. Figure 9 specifies the recommended solder paste stencil and land pattern for reliable joint formation without tombstoning or voiding.
BZX84W-B51-QF 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):
- 51 V
- Tolerance:
- ±1.96%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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-B51-QF FAQ
1.How can I place an order for BZX84W-B51-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B51-QF 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-B51-QF reliable?
The price and inventory of BZX84W-B51-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B51-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B51-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B51-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B51-QF?
BZX84W-B51-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B51-QF 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-B51-QF?
For technical support, including BZX84W-B51-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B51-QF requirements.
6.How does Aetrix verify that BZX84W-B51-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B51-QF 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-B51-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B51-QF?
All BZX84W-B51-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B51-QF, 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-B51-QF part is unused and in its original packaging.
Return procedure for BZX84W-B51-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B51-QF Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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