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Nexperia USA Inc. BZX84W-C4V3-QF
- Part No.:
- BZX84W-C4V3-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C4V3-QF.pdf
- Description:
- DIODE ZENER 4.3V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:8,216
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Product details
Overview
BZX84W-C4V3-QF from Nexperia is a ±5% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 4.3 V nominal Zener voltage at 5 mA, with 90 Ω differential resistance and −2.5 mV/K temperature coefficient, designed for precision voltage reference and overvoltage protection in automotive power rails and high-frequency signal conditioning circuits.
For engineers reviewing the BZX84W-C4V3-QF datasheet, BZX84W-C4V3-QF pinout, BZX84W-C4V3-QF application, or BZX84W-C4V3-QF equivalent, this page delivers verified Zener parameters, AEC-Q101 qualification status, thermal resistance (455 K/W), reverse leakage (3 µA at VR = 1 V), and SOT323 terminal mapping to support automotive-grade design validation and component selection.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled VZ = 4.00–4.60 V at IZ = 5 mA, exhibiting low dynamic impedance (90 Ω) and negative temperature coefficient (−2.5 mV/K) ideal for stable biasing in analog sensor interfaces and feedback networks. Its 275 mW total power dissipation is specified under FR4 PCB mounting conditions with single-sided copper.
The device features a three-terminal SOT323 package with Pin 1 = anode, Pin 2 = not connected, Pin 3 = cathode - enabling unidirectional clamping without parasitic conduction paths. It meets AEC-Q101 stress test requirements for automotive use, including operating ambient range of −55 °C to +150 °C and junction temperature up to 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.00–4.60 V at IZ = 5 mA; defines precise clamping threshold for 5 V rail stabilization |
| Differential Resistance (rdif) | 90 Ω max at IZ = 5 mA; ensures minimal output voltage shift under load variation |
| Temperature Coefficient (SZ) | −2.5 mV/K; enables predictable drift compensation in temperature-sensitive references |
| Reverse Leakage (IR) | 3 µA max at VR = 1 V; guarantees low standby current in always-on monitoring circuits |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; sets maximum continuous DC power handling |
| Junction-to-Ambient Thermal Resistance | 455 K/W; determines thermal rise per watt under standard PCB layout |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA; defines forward conduction loss during transient polarity reversal |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 1.3 mm × 1.8 mm footprint, 0.65 mm pitch, and 0.25 mm maximum thickness - optimized for high-density automotive PCBs and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Electrically isolated pad; no internal bond wire; must remain floating or grounded per layout rules |
| 3 | Cathode (K) | Reverse-biased terminal; ties to regulated output node or voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power domains |
| ±5% Zener voltage tolerance | Enables cost-effective selection where tight regulation is secondary to robustness and availability |
| Low capacitance (6 pF) | Minimizes signal distortion in RF coupling and high-speed digital line protection |
| Non-repetitive peak reverse power (40 W) | Supports surge immunity against ESD transients up to 100 µs duration |
| Wide operating temperature range | −55 °C to +150 °C ambient operation supports under-hood and battery management environments |
Applications
| Automotive Power Rail Clamping | Industrial Sensor Reference Biasing |
|---|---|
Use Scenario: Protecting 5 V microcontroller supply lines from load dump and alternator ripple in body control modules. IC Role / Device Role / Timing Role: Zener shunt regulator providing passive overvoltage clamp at system input stage. Use Value: Limits transient excursions to ≤4.6 V using only 275 mW dissipation, eliminating need for active supervision ICs. |
Use Scenario: Generating stable 4.3 V reference for analog front-end amplifiers in pressure and temperature sensors. IC Role / Device Role / Timing Role: Precision voltage reference source with −2.5 mV/K drift compensated by system calibration. Use Value: Delivers 90 Ω dynamic impedance and 3 µA leakage to maintain ADC accuracy across −40 °C to +125 °C. |
| High-Frequency Signal Conditioning | USB Port Overvoltage Protection |
Use Scenario: AC-coupled clipping of RF signals in automotive infotainment antenna interfaces. IC Role / Device Role / Timing Role: Low-capacitance (6 pF) bidirectional limiter shaping signal peaks without bandwidth degradation. Use Value: Maintains >100 MHz signal integrity while clamping excursions beyond ±4.3 V with sub-ns response. |
Use Scenario: Secondary overvoltage guard on USB VBUS line in telematics gateways exposed to hot-plug surges. IC Role / Device Role / Timing Role: Fast-reacting shunt protector activated before primary TVS reaches breakdown. Use Value: Engages at 4.3 V with 40 W non-repetitive surge rating, reducing stress on downstream USB PHY ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-B4V3-Q | ±2% tolerance (4.21–4.39 V), lower rdif (90 Ω typ vs. 90 Ω max), identical package and thermal specs | Preferred where tighter voltage accuracy is required for feedback loops or comparator thresholds | Select when VZ stability < ±2% is mandatory; accept higher unit cost and reduced stock availability |
| MMSZ4V3T1G | ±5% tolerance, SOD-123 package (larger footprint), 500 mW Ptot, 350 Ω rdif, not AEC-Q101 qualified | Suitable for industrial non-automotive designs requiring higher power margin but relaxed qualification | Choose for cost-sensitive consumer or industrial boards where AEC-Q101 is unnecessary and board space allows larger package |
Compared with BZX84W-C4V3-QF, the BZX84W-B4V3-Q offers tighter voltage control at the expense of availability and cost, while MMSZ4V3T1G trades automotive qualification and low impedance for higher power handling and broader commercial distribution.
Availability
BZX84W-C4V3-QF is available at Aetrix Electronics and suitable for automotive power rail clamping, industrial sensor reference biasing, and high-frequency signal conditioning requiring stable component supply across extended temperature ranges and AEC-Q101 compliance.
Supply support for BZX84W-C4V3-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 and logic devices for automotive, industrial, and mobile markets.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive voltage regulation, ESD protection, and reference stability in harsh-environment electronic control units.
FAQ
What is the maximum continuous reverse current this Zener can handle at 4.3 V?
The BZX84W-C4V3-QF is rated for 5 mA nominal Zener test current, with absolute maximum forward current of 200 mA. At its 4.3 V Zener voltage, continuous reverse current is limited by power dissipation: 275 mW ÷ 4.3 V ≈ 64 mA maximum under ideal thermal conditions. Derating applies above 25 °C ambient per Rth(j-a) = 455 K/W.
Is Pin 2 internally connected or should it be left floating on the PCB?
Pin 2 is explicitly marked "n.c." (not connected) in Nexperia's official pinning diagram and has no internal bond wire. It must remain electrically floating - neither tied to ground nor routed - to avoid unintended parasitic paths or solder bridging risks during reflow assembly.
How does the −2.5 mV/K temperature coefficient affect long-term voltage stability?
The −2.5 mV/K coefficient means VZ decreases by 2.5 mV per Kelvin rise in junction temperature. Over a 100 K range (e.g., −40 °C to +60 °C ambient), this yields ~250 mV drift. System-level calibration or complementary positive-coefficient components are used to compensate in precision references.
Can this Zener be used in parallel for higher power dissipation?
No - Zener diodes exhibit manufacturing spread in VZ, causing current hogging when paralleled. Even matched units risk thermal runaway due to positive temperature coefficient of dynamic resistance. For >275 mW, use a single higher-power Zener or active regulation instead.
BZX84W-C4V3-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):
- 4.3 V
- Tolerance:
- ±6.98%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 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-C4V3-QF FAQ
1.How can I place an order for BZX84W-C4V3-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C4V3-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-C4V3-QF reliable?
The price and inventory of BZX84W-C4V3-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-C4V3-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-C4V3-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C4V3-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C4V3-QF?
BZX84W-C4V3-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C4V3-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-C4V3-QF?
For technical support, including BZX84W-C4V3-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C4V3-QF requirements.
6.How does Aetrix verify that BZX84W-C4V3-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-C4V3-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-C4V3-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-C4V3-QF?
All BZX84W-C4V3-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C4V3-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-C4V3-QF part is unused and in its original packaging.
Return procedure for BZX84W-C4V3-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C4V3-QF Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-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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SMAZ12-13-F
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