My Inquiry
My Account
Nexperia USA Inc. BZX84W-C4V3F
- Part No.:
- BZX84W-C4V3F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C4V3F.pdf
- Description:
- DIODE ZENER 4.3V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:9,985
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84W-C4V3F 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, 275 mW total power dissipation, and 90 Ω differential resistance at IZ = 5 mA. It serves as a precision reference or low-power voltage clamp in signal conditioning and power rail stabilization circuits.
For engineers reviewing the BZX84W-C4V3F datasheet, BZX84W-C4V3F pinout, BZX84W-C4V3F application, or BZX84W-C4V3F equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (455 K/W), reverse leakage current (3 µA at VR = 1 V), forward voltage (≤0.9 V at 10 mA), and SOT323 footprint compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its cathode-anode terminals under varying load or supply conditions. Its ±5 % tolerance (C-series) and 4.3 V nominal Zener voltage are specified at IZ = 5 mA with a temperature coefficient of −2.5 mV/K, indicating predictable drift over temperature.
The device features low dynamic impedance (90 Ω at 5 mA) and minimal junction capacitance (450 pF at 1 MHz, VR = 0 V), enabling effective noise suppression and stability in high-frequency regulation tasks. Its 200 mA maximum forward current and 40 W non-repetitive peak reverse power capability support transient resilience in compact power management nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V nominal at IZ = 5 mA; ±5 % tolerance ensures predictable clamping within 4.0–4.6 V range |
| Differential Resistance (rdif) | 90 Ω at IZ = 5 mA; low impedance maintains tight regulation under small load variations |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; defines continuous DC or average power handling limit |
| Reverse Leakage (IR) | 3 µA at VR = 1 V; low leakage preserves accuracy in low-current bias/reference networks |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA; enables efficient forward conduction when used bidirectionally or in protection paths |
| Thermal Resistance (Rth(j-a)) | 455 K/W in free air on standard FR4; determines junction-to-ambient temperature rise per watt dissipated |
| Junction Temperature (Tj) | 150 °C maximum; sets upper thermal operating limit for reliability in ambient up to +150 °C |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm footprint, 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential node in Zener operation (reverse-biased) |
| 2 | Not Connected (n.c.) | Internally unconnected terminal; must remain floating-no PCB trace or solder mask violation |
| 3 | Cathode (K) | Reverse-bias terminal; connected to higher-potential node to enable Zener breakdown and regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective voltage referencing where tighter tolerance is not required, reducing BOM cost vs. ±2 % (B-series) variants |
| 275 mW power rating on FR4 | Supports regulation in low-power sensor interfaces, microcontroller reset circuits, and analog front-end biasing without heatsinking |
| 450 pF junction capacitance | Minimizes high-frequency loading in RF detector biasing and clock line clamping applications up to ~100 MHz |
| −2.5 mV/K temperature coefficient | Provides predictable, moderate negative drift-suitable for room-temperature-stable references and compensation-aware designs |
| SOT323 package compatibility | Enables automated placement and reflow in high-density consumer and industrial PCBs with IPC-compliant land patterns |
Applications
| Microcontroller Reset Circuit | ADC Reference Clamp |
|---|---|
|
Use Scenario: Provides a stable 4.3 V threshold to trigger a reset signal when VCC drops below operational range in an STM32-based edge node. IC Role / Device Role / Timing Role: Zener diode functions as a precision voltage comparator input reference, interfacing with an external reset supervisor IC. Use Value: ±5 % tolerance and 90 Ω dynamic impedance ensure repeatable reset assertion within 10 ms of brown-out, preventing firmware corruption. |
Use Scenario: Clamps the reference input of a 12-bit SAR ADC (e.g., ADS7953) to prevent overvoltage damage during ESD events on sensor lines. IC Role / Device Role / Timing Role: Acts as a fast-reacting shunt protector, diverting transients before they reach the ADC's sensitive internal reference buffer. Use Value: 40 W non-repetitive peak power rating absorbs 2 kV HBM ESD pulses without degradation, preserving ADC accuracy over 100k cycles. |
| Low-Power Sensor Biasing | USB Interface Voltage Clamp |
|
Use Scenario: Supplies regulated 4.3 V bias to a MEMS pressure sensor's analog output stage in a battery-powered IoT transmitter. IC Role / Device Role / Timing Role: Functions as a passive voltage source, replacing active LDOs to reduce quiescent current in sleep mode. Use Value: 3 µA reverse leakage at 1 V ensures <100 nA standby current draw, extending coin-cell life beyond 5 years. |
Use Scenario: Protects USB 2.0 D+ and D− data lines from induced surges in industrial docking stations using shared ground planes. IC Role / Device Role / Timing Role: Dual-diode configuration (anode-to-ground, cathode-to-line) provides bidirectional clamping at ±4.3 V. Use Value: 0.9 V forward voltage enables low-threshold turn-on during positive transients, limiting line voltage to <5.2 V during 1 A surge events. |
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 | ±2 % tolerance (4.21–4.39 V), lower rdif (600 Ω at 1 mA), identical package and Ptot | Higher precision required in calibration-critical analog front ends; tighter thermal drift control needed | Select when absolute voltage accuracy outweighs cost sensitivity and board space is constrained |
| MMSZ4V3 | Same 4.3 V nominal, ±5 %, but SOD-123 package (larger, 2.7 × 1.6 mm), 500 mW Ptot, 100 Ω rdif | Higher power handling and thermal margin required in 12 V automotive subsystems with >150 °C ambient | Choose when mechanical robustness, higher surge immunity, or legacy footprint compatibility is prioritized over miniaturization |
Compared with BZX84W-C4V3F, the BZX84W-B4V3 offers tighter regulation at the expense of higher unit cost and identical thermal limits, while the MMSZ4V3 trades SOT323 miniaturization for greater power headroom and thermal derating flexibility in harsh environments.
Availability
BZX84W-C4V3F is available at Aetrix Electronics and suitable for microcontroller reset circuits, ADC reference clamping, low-power sensor biasing, and USB interface protection requiring stable component supply across high-mix production runs.
Supply support for BZX84W-C4V3F 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 and industrial-grade components.
The BZX84W series targets cost-sensitive, space-constrained applications demanding stable Zener regulation in consumer, computing, and industrial electronics-designed for manufacturability, thermal predictability, and long-term supply consistency.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX84W-C4V3F has a nominal Zener voltage of 4.3 V at 5 mA, with a guaranteed breakdown range of 4.0 V to 4.6 V due to its ±5 % tolerance. It is not rated for sustained reverse voltage above this range; operation beyond 4.6 V risks exceeding power limits or thermal runaway unless current is strictly limited by external series resistance.
Can this Zener diode be used in series or parallel configurations?
Series connection is permissible for higher composite Zener voltages, provided current matching and thermal coupling are managed. Parallel use is strongly discouraged due to mismatched breakdown characteristics-uneven current sharing may cause thermal runaway in one device, leading to premature failure.
Is the 'n.c.' pin electrically isolated or internally tied to substrate?
Pin 2 is explicitly designated "not connected" in Nexperia's official pinning information and graphic symbol. It is fully isolated-no internal bond wire, die attachment, or metallization connects it to the silicon die or package substrate. PCB layout must leave this pad unconnected and avoid solder mask bridging.
How does temperature affect its Zener voltage stability?
At IZ = 5 mA, the BZX84W-C4V3F exhibits a temperature coefficient of −2.5 mV/K, meaning its Zener voltage decreases by approximately 2.5 mV per degree Celsius rise. This behavior is confirmed in Figure 6 of the datasheet and remains stable across the full −55 °C to +150 °C operating range.
BZX84W-C4V3F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-C4V3F FAQ
1.How can I place an order for BZX84W-C4V3F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C4V3F 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-C4V3F reliable?
The price and inventory of BZX84W-C4V3F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C4V3F is usually 5 days.
3.What payment methods are accepted for BZX84W-C4V3F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C4V3F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C4V3F?
BZX84W-C4V3F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C4V3F 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-C4V3F?
For technical support, including BZX84W-C4V3F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C4V3F requirements.
6.How does Aetrix verify that BZX84W-C4V3F is sourced from the original manufacturer or authorized distributors?
All BZX84W-C4V3F 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-C4V3F meets industry standards.
7.What is the process for return or replacement of BZX84W-C4V3F?
All BZX84W-C4V3F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C4V3F, 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-C4V3F part is unused and in its original packaging.
Return procedure for BZX84W-C4V3F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C4V3F Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
