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Nexperia USA Inc. BZX84W-C51-QF
- Part No.:
- BZX84W-C51-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C51-QF.pdf
- Description:
- DIODE ZENER 51V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,457
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Product details
Overview
BZX84W-C51-QF from Nexperia is a ±5% tolerance Zener diode with 51 V nominal regulation voltage, 400 Ω differential resistance at 2 mA, and 51.0 mV/K temperature coefficient, housed in an AEC-Q101-qualified SOT323 (SC-70) package for automotive voltage reference and overvoltage protection circuits.
For engineers reviewing the BZX84W-C51-QF datasheet, BZX84W-C51-QF pinout, BZX84W-C51-QF application, or BZX84W-C51-QF equivalent, this device serves as a precision shunt regulator in low-power supply rails, ESD-clamped signal conditioning paths, and automotive sensor biasing networks where stable reverse breakdown and thermal predictability are critical.
Technical Context
This Zener operates in reverse-biased breakdown mode with a specified 51 V nominal Zener voltage at IZ = 2 mA, exhibiting a positive temperature coefficient of +51.0 mV/K - indicating voltage increases linearly with junction temperature. Its 400 Ω dynamic impedance ensures predictable regulation under varying load currents.
The device supports non-repetitive surge handling up to 40 W for 100 µs pulses and maintains stable operation across −55 °C to +150 °C ambient range. It is qualified per AEC-Q101, confirming robustness against thermal cycling, humidity, and mechanical stress required for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V nominal at IZ = 2 mA; defines precise shunt regulation point for feedback or clamping |
| Tolerance | ±5% (C-grade); allows design margin for worst-case voltage drift in production systems |
| Differential Resistance (rdif) | 400 Ω max at IZ = 2 mA; determines output impedance and load regulation error |
| Temperature Coefficient (SZ) | +51.0 mV/K; enables predictable voltage drift compensation in wide-temperature environments |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; sets maximum continuous DC power handling |
| Reverse Current (IR) | 50 nA max at VR = 35.7 V (0.7 × VZnom); ensures low leakage in high-impedance bias networks |
| Junction Temperature (Tj) | 150 °C max; defines upper thermal limit for reliable long-term operation |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, footprint optimized for reflow soldering per JEDEC MO-203-DA.
| 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.) | Electrically isolated terminal; no internal bond wire or die connection; must remain unconnected |
| 3 | Cathode (K) | Reverse-bias terminal; connected to higher-potential node; carries Zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HAST, and mechanical shock testing |
| Low capacitance (0.4 pF) | Minimizes signal distortion in high-frequency clamp or RF detector applications |
| Non-repetitive peak power (40 W) | Withstands transient surges such as ISO 7637-2 pulse 1/2a without failure |
| Wide operating temperature (−55 °C to +150 °C) | Supports engine control unit (ECU), transmission, and ADAS module deployment |
| SOT323 compact footprint (2.2 mm × 1.35 mm) | Enables dense PCB layouts in space-constrained automotive modules |
Applications
| Automotive Sensor Biasing | Power Supply Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable reference voltage to analog sensors (e.g., pressure, temperature) in engine control units. IC Role / Device Role / Timing Role: Shunt regulator establishing fixed bias point for sensor Wheatstone bridge excitation. Use Value: ±5% tolerance and +51.0 mV/K TC enable predictable sensor offset calibration across −40 °C to +125 °C ambient. |
Use Scenario: Clamping 12 V/24 V vehicle bus transients to protect downstream LDOs and microcontrollers. IC Role / Device Role / Timing Role: Passive voltage limiter absorbing energy during load-dump events. Use Value: 40 W non-repetitive surge rating handles ISO 7637-2 Pulse 5a (100 ms, 100 V) without degradation. |
| Industrial Signal Conditioning | ESD-Protected Interface Circuit |
|
Use Scenario: Stabilizing reference voltage for 4–20 mA transmitter loop-powered circuits. IC Role / Device Role / Timing Role: Precision Zener setting loop compliance voltage and current-sense threshold. Use Value: 400 Ω rdif ensures <1% regulation error across 0.5–5 mA loop current variation. |
Use Scenario: Low-capacitance clamping on CAN or LIN bus lines to suppress ESD and fast transients. IC Role / Device Role / Timing Role: Secondary protection element placed after TVS diodes to fine-tune clamping level. Use Value: 0.4 pF capacitance avoids signal integrity loss on 500 kbps CAN FD or 19.2 kbps LIN interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-B51-Q | ±2% tolerance, 300 Ω rdif, +51.0 mV/K TC | Higher precision needed for closed-loop feedback references | Select when tighter voltage accuracy outweighs cost sensitivity |
| MMSZ5257ET1G | ±5% tolerance, 17 Ω rdif, +2.5 mV/K TC, SOD-123 package | Lower impedance but larger footprint and non-automotive qualification | Choose for industrial non-automotive designs requiring lower dynamic impedance |
Compared with BZX84W-C51-QF, the BZX84W-B51-Q offers tighter tolerance and lower impedance but at higher cost and identical thermal behavior, while MMSZ5257ET1G provides significantly lower rdif but lacks AEC-Q101 qualification and uses a larger SOD-123 package unsuitable for ultra-dense automotive PCBs.
Availability
BZX84W-C51-QF is available at Aetrix Electronics and suitable for automotive ECU voltage reference, industrial 4–20 mA loop regulation, and CAN/LIN bus ESD protection requiring stable component supply across extended temperature ranges and AEC-Q101 compliance.
Supply support for BZX84W-C51-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, designed specifically for automotive voltage regulation, biasing, and transient suppression where reliability under harsh environmental conditions is mandatory.
FAQ
What is the maximum continuous reverse current for BZX84W-C51-QF at 25 °C?
The device has no defined maximum continuous reverse current; instead, its safe operating limit is governed by total power dissipation. At 25 °C ambient on a standard FR4 PCB, Ptot = 275 mW limits IZ to approximately 5.4 mA (275 mW ÷ 51 V), assuming full Zener conduction. Derating is required above 25 °C per Rth(j-a) = 455 K/W.
Can BZX84W-C51-QF be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients below ~5 V and positive above, but even within the same batch, minor VZ mismatches cause current hogging. Parallel operation is not recommended; instead, use a single higher-power Zener or active regulation for >275 mW requirements.
Is the n.c. pin (Pin 2) required to be grounded or left floating?
Pin 2 is internally not connected and must remain unconnected in the PCB layout. Grounding or routing it risks unintended parasitic coupling or solder bridging; the SOT323 footprint drawing explicitly defines it as electrically isolated with no internal die connection.
How does the +51.0 mV/K temperature coefficient affect circuit performance?
This positive coefficient means VZ increases by 51 mV per Kelvin rise in junction temperature. In a 51 V reference, that equals ~0.1%/°C drift - acceptable for many automotive applications but requires compensation in precision analog circuits using temperature-sensing resistors or digital calibration.
BZX84W-C51-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:
- ±5.88%
- 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-C51-QF FAQ
1.How can I place an order for BZX84W-C51-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C51-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-C51-QF reliable?
The price and inventory of BZX84W-C51-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-C51-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-C51-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C51-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C51-QF?
BZX84W-C51-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C51-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-C51-QF?
For technical support, including BZX84W-C51-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C51-QF requirements.
6.How does Aetrix verify that BZX84W-C51-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-C51-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-C51-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-C51-QF?
All BZX84W-C51-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C51-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-C51-QF part is unused and in its original packaging.
Return procedure for BZX84W-C51-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C51-QF Tags
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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