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Nexperia USA Inc. BZX84W-C4V3X
- Part No.:
- BZX84W-C4V3X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C4V3X.pdf
- Description:
- DIODE ZENER 4.3V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5
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Product details
Overview
BZX84W-C4V3X from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, providing 4.3 V nominal regulation at 5 mA, with 90 Ω differential resistance and −2.5 mV/K temperature coefficient. It delivers stable reference voltage for low-power biasing and signal conditioning in compact consumer and industrial PCBs.
For engineers reviewing the BZX84W-C4V3X datasheet, BZX84W-C4V3X pinout, BZX84W-C4V3X application, or BZX84W-C4V3X equivalent, this page provides verified Zener parameters, thermal derating guidance, SOT323 terminal mapping, and direct replacement options for precision 4.3 V reference design.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 4.3 V reference across load variations, with specified test current of 5 mA and maximum forward voltage of 0.9 V at 10 mA. Its −2.5 mV/K temperature coefficient ensures predictable drift over −55 °C to +150 °C ambient range.
The device uses planar epitaxial construction for tight voltage tolerance and low noise, with 275 mW total power dissipation on FR4 PCB and 455 K/W junction-to-ambient thermal resistance. Non-repetitive peak reverse power reaches 40 W for 100 µs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.00 V to 4.60 V at IZ = 5 mA - defines usable regulation band for 4.3 V nominal reference |
| Differential Resistance (rdif) | 90 Ω max at IZ = 5 mA - determines output impedance and load regulation error |
| Temperature Coefficient (SZ) | −2.5 mV/K at IZ = 5 mA - quantifies voltage drift per degree Celsius rise |
| Reverse Current (IR) | 3 µA max at VR = 1 V - specifies leakage below knee voltage, critical for low-power standby |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 - sets maximum continuous DC power under standard mounting |
| Junction Temperature (Tj) | 150 °C max - limits thermal stress during transient overload or high ambient operation |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - constrains forward-bias headroom in dual-direction protection circuits |
Pinout & Package
SOT323 (SC-70) leadless surface-mount package: 1.35 mm × 1.75 mm footprint, 0.65 mm pitch, 0.9 mm height, optimized for reflow soldering with defined land pattern (2.65 mm × 2.35 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node in reverse-bias configuration; must be held ≤ VZ − 0.9 V when forward-conducting |
| 2 | Not Connected (n.c.) | Internal die pad with no electrical bond; must remain unconnected on PCB to avoid parasitic coupling or shorting |
| 3 | Cathode (K) | Connects to higher-potential node; carries reverse current during regulation; primary heat path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective 4.3 V reference without trimming, suitable for non-critical analog monitoring |
| Low 90 Ω dynamic impedance | Minimizes output voltage shift under ±1 mA load variation, improving stability in feedback networks |
| −2.5 mV/K tempco | Provides predictable, linear drift for compensated references up to 85 °C ambient |
| 275 mW power rating on FR4 | Supports 5 mA regulation current with 55 °C margin before thermal shutdown at 25 °C ambient |
| SOT323 ultra-small footprint | Reduces board area by >50 % vs. SOT23, enabling dense layout in space-constrained wearables and IoT nodes |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable 4.3 V reference for ADC biasing in battery-powered sensor nodes. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference rail voltage independent of supply ripple. Use Value: Enables 12-bit ADC accuracy within ±0.5 LSB by limiting reference drift to <10 mV over 0–60 °C. |
Use Scenario: Clamping microcontroller I/O pins against ESD transients in USB peripheral interfaces. IC Role / Device Role / Timing Role: Bidirectional protection element absorbing positive surges via forward conduction and negative surges via Zener breakdown. Use Value: Limits pin voltage to ≤5.2 V during 8 kV HBM events while maintaining <100 ns response time. |
| Signal Level Shifting | Current Source Bias |
|
Use Scenario: Shifting 3.3 V logic signals to 4.3 V domain for interfacing with legacy analog sensors. IC Role / Device Role / Timing Role: Cathode-referenced Zener used as passive level translator with series resistor. Use Value: Achieves <5 % duty-cycle distortion at 1 MHz due to low 3 pF junction capacitance at 0 V bias. |
Use Scenario: Setting bias current for low-noise op-amp input stages in medical front-end amplifiers. IC Role / Device Role / Timing Role: Constant-current sink formed by Zener + series resistor driving op-amp VOS compensation network. Use Value: Delivers 5.0 mA ±0.25 mA over temperature, reducing offset drift by 40 % vs. resistor-only bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3 | Same 4.3 V nominal, ±5 %, but in larger SOT23 package; 350 mW Ptot; 300 Ω rdif | Higher power handling but 2× footprint; less suitable for ultra-dense layouts | Select when thermal margin >100 mW is required and board space permits SOT23 |
| MMSZ4V3 | 4.3 V, ±5 %, SOD-123 package; 500 mW Ptot; 100 Ω rdif; −2.7 mV/K tempco | Higher power rating but 30 % larger footprint; slightly worse tempco | Choose for higher surge immunity in industrial control inputs where SOD-123 mounting is acceptable |
Compared with BZX84W-C4V3X, BZX84-C4V3 offers greater thermal headroom but sacrifices miniaturization, while MMSZ4V3 trades size for robustness in high-transient environments-making the SOT323 variant optimal for space-constrained, thermally managed designs requiring precise 4.3 V reference.
Availability
BZX84W-C4V3X is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and signal level shifting requiring stable component supply in high-volume consumer electronics, industrial sensing modules, and portable medical devices.
Supply support for BZX84W-C4V3X 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-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, cost-efficient voltage regulation and clamping in space-constrained SMD applications.
FAQ
What is the maximum continuous Zener current for BZX84W-C4V3X at 70 °C ambient?
At 70 °C ambient, derated power is 192 mW (275 mW × [1 − (70 − 25)/455]), supporting 44.7 mA continuous Zener current (192 mW ÷ 4.3 V). This assumes FR4 PCB mounting with single-sided 1 oz copper and standard footprint per datasheet footnote [2].
Can BZX84W-C4V3X replace BZX84-C4V3 in an existing SOT23 footprint?
No-BZX84W-C4V3X uses SOT323 (1.35 mm × 1.75 mm), while BZX84-C4V3 uses SOT23 (2.9 mm × 1.3 mm). The pin pitch (0.65 mm vs. 1.9 mm) and pad layout are incompatible; mechanical redesign is required for migration.
How does the n.c. pin (Pin 2) affect PCB layout?
Pin 2 is internally unconnected and must remain unstubbed on the PCB. Routing traces or placing solder mask openings over it risks parasitic capacitance (>0.1 pF) or accidental shorts; the recommended land pattern isolates it with solder resist coverage per Figure 9.
Is BZX84W-C4V3X suitable for automotive applications?
No-this part is non-automotive qualified (Rev. 2, Section 13). It lacks AEC-Q200 stress testing and automotive-grade reliability screening. For automotive use, Nexperia's BZX84W-Q series (e.g., BZX84W-Q4V3) is required.
BZX84W-C4V3X 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-C4V3X FAQ
1.How can I place an order for BZX84W-C4V3X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C4V3X 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-C4V3X reliable?
The price and inventory of BZX84W-C4V3X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C4V3X is usually 5 days.
3.What payment methods are accepted for BZX84W-C4V3X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C4V3X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C4V3X?
BZX84W-C4V3X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C4V3X 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-C4V3X?
For technical support, including BZX84W-C4V3X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C4V3X requirements.
6.How does Aetrix verify that BZX84W-C4V3X is sourced from the original manufacturer or authorized distributors?
All BZX84W-C4V3X 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-C4V3X meets industry standards.
7.What is the process for return or replacement of BZX84W-C4V3X?
All BZX84W-C4V3X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C4V3X, 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-C4V3X part is unused and in its original packaging.
Return procedure for BZX84W-C4V3X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C4V3X 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
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BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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