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Nexperia USA Inc. BZX84W-C4V3-QX
- Part No.:
- BZX84W-C4V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C4V3-QX.pdf
- Description:
- DIODE ZENER 4.3V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,326
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Product details
Overview
BZX84W-C4V3-QX from Nexperia is a ±5 % tolerance Zener diode in SOT323 (SC-70) package, rated for 4.3 V nominal regulation voltage at 5 mA, with 90 Ω differential resistance and −2.5 mV/K temperature coefficient. It delivers 275 mW total power dissipation on FR4 PCB and supports automotive-grade voltage reference and overvoltage protection in compact DC-DC feedback loops.
For engineers reviewing the BZX84W-C4V3-QX datasheet, BZX84W-C4V3-QX pinout, BZX84W-C4V3-QX application, or BZX84W-C4V3-QX equivalent, this page provides verified Zener parameters, AEC-Q101 qualification status, thermal resistance (455 K/W), reverse leakage (3 µA at VR = 1 V), and SOT323 terminal mapping - all critical for precision biasing and ESD-tolerant regulator design.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable 4.3 V reference under regulated current conditions (IZ = 5 mA). Its −2.5 mV/K temperature coefficient ensures predictable drift across −55 °C to +150 °C ambient range, and its 90 Ω differential resistance minimizes output voltage variation under load changes.
The device features a three-terminal SOT323 package with anode (Pin 1), not-connected (Pin 2), and cathode (Pin 3), enabling unidirectional clamping and low-capacitance (≤6 pF at 1 MHz, VR = 0 V) operation suitable for high-frequency stabilization and transient suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.00 V to 4.60 V at IZ = 5 mA - defines tight regulation window for 3.3 V/5 V rail monitoring |
| Differential Resistance (rdif) | 90 Ω max at IZ = 5 mA - limits output voltage shift under ±1 mA load variation |
| Reverse Leakage (IR) | 3 µA max at VR = 1 V - ensures minimal quiescent current in always-on bias networks |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB - sets maximum continuous Zener current to ~64 mA |
| Thermal Resistance (Rth(j-a)) | 455 K/W - determines junction temperature rise of ~125 °C above ambient at full power |
| Junction Temperature (Tj) | −55 °C to +150 °C - enables operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - certified for automotive electronics per stress test qualification standard |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package: 1.35 mm × 1.75 mm footprint, 0.95 mm height, tin-plated terminations, compatible with reflow and wave soldering per IPC-7095.
| 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.) | Internally isolated; no electrical function - must remain unconnected in PCB layout |
| 3 | Cathode (K) | Reverse-biased terminal; ties to regulated output node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-optimized selection where tighter regulation is not required, e.g., non-critical sensor biasing |
| AEC-Q101 qualification | Validates reliability for automotive infotainment, body control modules, and ADAS power domains |
| Low 6 pF diode capacitance | Minimizes signal distortion in high-frequency feedback paths up to 100 MHz |
| Non-repetitive peak reverse power: 40 W | Supports transient surge clamping (tp ≤ 100 µs) without degradation in ESD protection circuits |
| FR4-compatible thermal performance | Delivers full 275 mW rating using standard single-sided copper PCB without thermal pads or vias |
Applications
| Automotive Sensor Biasing | USB Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable reference voltage to analog front-end of tire pressure sensors in wheel modules. IC Role / Device Role / Timing Role: Zener voltage reference establishing 4.3 V bias point for op-amp input stage and ADC reference divider. Use Value: −2.5 mV/K tempco and AEC-Q101 qualification ensure <±10 mV drift over −40 °C to +125 °C operating range. |
Use Scenario: Clamping VBUS line against 5.5 V transients during hot-plug events in USB 2.0 host ports. IC Role / Device Role / Timing Role: Shunt protection device conducting surge current when VBUS exceeds 4.3 V + forward drop. Use Value: 40 W non-repetitive peak power rating absorbs 100 µs surges without failure, per IEC 61000-4-2 Level 4. |
| Industrial PLC Analog Input Protection | Low-Power MCU Reset Circuit |
|
Use Scenario: Protecting 0–10 V analog input channels from field-wiring induced overvoltage in programmable logic controllers. IC Role / Device Role / Timing Role: Precision clamp limiting input voltage to 4.3 V before signal conditioning amplifier stage. Use Value: 90 Ω rdif ensures clamped voltage stays within ±0.1 V of nominal under 1 mA fault current, preserving measurement integrity. |
Use Scenario: Generating clean reset threshold for ARM Cortex-M0+ microcontrollers operating from 3.3 V supply rails. IC Role / Device Role / Timing Role: Zener-based reset supervisor providing 4.3 V detection point for brown-out reset assertion. Use Value: 3 µA IR at 1 V reverse bias guarantees sub-1 µA standby current draw in battery-backed systems. |
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 AEC-Q101 rating | Preferred where tighter regulation is needed for precision references, e.g., ADC voltage references | Select for improved accuracy-critical designs; same footprint and thermal behavior |
| MMSZ4V3T1G | ±5 % tolerance, SOD-123 package (larger), 500 mW Ptot, higher Rth(j-a) (~300 K/W), no AEC-Q101 claim | Suitable for industrial non-automotive applications where board space and qualification are less constrained | Choose only if SOT323 size is not required and automotive qualification is unnecessary |
Compared with BZX84W-C4V3-QX, the BZX84W-B4V3-Q offers tighter voltage control for metrology-grade circuits, while MMSZ4V3T1G trades automotive compliance and miniaturization for higher power handling in legacy industrial layouts.
Availability
BZX84W-C4V3-QX is available at Aetrix Electronics and suitable for automotive sensor biasing, USB port overvoltage protection, and industrial PLC analog input protection requiring stable component supply, AEC-Q101 traceability, and SOT323 space efficiency.
Supply support for BZX84W-C4V3-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 essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage regulation and transient suppression in space-constrained automotive electronics.
FAQ
What is the maximum continuous Zener current for BZX84W-C4V3-QX at 25 °C?
The maximum continuous Zener current is calculated as Ptot / VZ = 275 mW / 4.3 V ≈ 64 mA. However, derating is required above 25 °C ambient due to 455 K/W thermal resistance; at 85 °C ambient, usable current drops to ~35 mA to maintain Tj ≤ 150 °C.
Is Pin 2 electrically functional in the SOT323 package?
No - Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia datasheet. It is an internal dummy lead with no bond wire or silicon connection, and must remain unconnected on the PCB to avoid unintended parasitic coupling or mechanical stress.
How does the −2.5 mV/K temperature coefficient affect regulation accuracy over temperature?
At IZ = 5 mA, the Zener voltage shifts −2.5 mV per Kelvin rise. From 25 °C to 125 °C (ΔT = 100 K), VZ decreases by 250 mV - from 4.3 V to ~4.05 V. This drift is fully characterized and repeatable, enabling compensation in closed-loop systems or acceptable for ±5 % tolerance applications.
Can BZX84W-C4V3-QX replace BZX84-C4V3 in existing designs?
Yes - BZX84W-C4V3-QX is the automotive-qualified, SOT323-packaged successor to the legacy SOT23 BZX84-C4V3. It matches the same 4.3 V rating, ±5 % tolerance, and electrical characteristics, while adding AEC-Q101 qualification and improved thermal performance on FR4.
BZX84W-C4V3-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):
- 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-QX FAQ
1.How can I place an order for BZX84W-C4V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C4V3-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-C4V3-QX reliable?
The price and inventory of BZX84W-C4V3-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-C4V3-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-C4V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C4V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C4V3-QX?
BZX84W-C4V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C4V3-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-C4V3-QX?
For technical support, including BZX84W-C4V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C4V3-QX requirements.
6.How does Aetrix verify that BZX84W-C4V3-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-C4V3-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-C4V3-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-C4V3-QX?
All BZX84W-C4V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C4V3-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-C4V3-QX part is unused and in its original packaging.
Return procedure for BZX84W-C4V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C4V3-QX Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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