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Nexperia USA Inc. BZX84W-C43F
- Part No.:
- BZX84W-C43F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C43F.pdf
- Description:
- DIODE ZENER 43V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,935
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Product details
Overview
BZX84W-C43F from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 43 V nominal Zener voltage at 2 mA, 375 Ω typical differential resistance, and 41.2 mV/K temperature coefficient. It delivers stable reference voltage in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.
For engineers reviewing the BZX84W-C43F datasheet, BZX84W-C43F pinout, BZX84W-C43F application, or BZX84W-C43F equivalent, this page provides verified Zener voltage, thermal resistance, reverse leakage, forward voltage, and package-specific soldering footprint data essential for precision biasing and regulation design.
Technical Context
This device operates as a two-terminal shunt voltage reference, conducting in reverse breakdown to clamp voltage across its terminals. Its 43 V nominal Zener voltage is specified at IZ = 2 mA with ±5 % tolerance, and exhibits 375 Ω typical dynamic impedance at that current.
Thermal resistance from junction to ambient is 455 K/W on FR4 PCB with single-sided copper, limiting continuous power dissipation to 275 mW at Tamb = 25 °C. Reverse leakage remains ≤50 nA at VR = 0.7 × VZnom, supporting low-current standby regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40.0 V to 46.0 V at IZ = 2 mA - defines regulation band for feedback or clamping circuits |
| Differential Resistance (rdif) | 375 Ω typical at IZ = 2 mA - determines output impedance and load regulation error |
| Temperature Coefficient (SZ) | 41.2 mV/K - quantifies voltage drift per degree Celsius under regulation current |
| Reverse Leakage (IR) | ≤50 nA at VR = 29.4 V - ensures minimal quiescent current in high-impedance bias networks |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - enables use as low-drop rectifier or ESD clamp in forward mode |
| Total Power Dissipation (Ptot) | 275 mW on FR4 PCB - sets maximum continuous DC or average pulsed power in SMT layout |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation in extended industrial environments |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package with 3 leads; leadless, very small outline optimized for high-density PCB assembly and reflow/wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward conduction terminal; connects to lower-potential node in Zener configuration |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected in PCB layout to avoid parasitic coupling |
| 3 | Cathode (K) | Reverse-bias terminal; connects to higher-potential node for Zener regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective regulation where tight voltage accuracy is not required |
| 275 mW power rating on standard FR4 | Supports direct integration into low-power supply rails without heatsinking |
| 455 K/W junction-to-ambient thermal resistance | Allows thermal modeling for ambient temperatures up to +125 °C in derated operation |
| Non-repetitive peak reverse power: 40 W (100 µs) | Provides transient overvoltage suppression capability in surge-prone interfaces |
| Low reverse leakage (≤50 nA) | Maintains regulation stability in high-impedance voltage divider or reference networks |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
|
Use Scenario: Regulating output voltage of isolated flyback or buck converter via optocoupler feedback loop. IC Role / Device Role / Timing Role: Shunt reference providing precise 43 V threshold to control PWM duty cycle. Use Value: Maintains ±5 % output regulation across line/load variations without external op-amp compensation. |
Use Scenario: Clamping input rail of microcontroller GPIO or sensor interface against ESD or inductive spikes. IC Role / Device Role / Timing Role: Passive crowbar element absorbing transient energy above 43 V. Use Value: Limits voltage excursion to safe levels while drawing <50 nA during normal operation. |
| Reference Voltage Source | High-Frequency Bias Network |
|
Use Scenario: Generating stable bias point for RF amplifier stage or ADC reference buffer. IC Role / Device Role / Timing Role: Low-noise DC reference node decoupled from noisy supply rails. Use Value: 41.2 mV/K tempco enables predictable drift compensation in calibrated systems. |
Use Scenario: Setting DC operating point in broadband amplifier or mixer bias tee. IC Role / Device Role / Timing Role: High-frequency stable Zener node with 0.6 pF capacitance at 1 MHz. Use Value: Minimal signal distortion due to low junction capacitance and fast recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5257BS | 43 V ±5 %, SOT-323, 225 mW Ptot, 400 Ω rdif | Lower power rating limits use in sustained 2 mA regulation; identical pinout | Select when board-level thermal margin is constrained and peak pulse handling is secondary |
| Vishay BZX84-C43 | 43 V ±5 %, SOT-23, 350 mW Ptot, 350 Ω rdif, 3-pin with no n.c. terminal | Larger footprint but higher continuous power; requires layout revision | Choose for higher reliability in thermally demanding environments where SOT-23 is acceptable |
Compared with MMBZ5257BS, BZX84W-C43F offers +50 mW power headroom and lower thermal resistance; versus BZX84-C43, it trades 75 mW power for 0.2 mm² smaller area and eliminates one active terminal-critical for ultra-dense routing.
Availability
BZX84W-C43F is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and reference voltage source applications requiring stable component supply, consistent parametric performance, and long-term SMT manufacturability.
Supply support for BZX84W-C43F 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, serving automotive, industrial, and consumer markets with scalable manufacturing and rigorous quality control.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, cost-efficient voltage regulation in space-constrained SMT designs across industrial and computing applications.
FAQ
What is the Zener test current for BZX84W-C43F?
The nominal Zener voltage of 43 V is specified at a test current of 2 mA, as confirmed in Table 9 of the datasheet. This current level balances measurement stability with low self-heating, and is used for both tolerance grading and differential resistance characterization.
Can BZX84W-C43F be used in forward bias?
Yes - its forward voltage is guaranteed ≤0.9 V at 10 mA, making it suitable for low-drop rectification or ESD clamping in forward conduction. However, it is not optimized for continuous forward conduction; maximum forward current is limited to 200 mA per Absolute Maximum Ratings.
Is Pin 2 truly unused, or does it serve a mechanical function?
Pin 2 is internally not connected (n.c.), with no electrical function. Its presence supports mechanical stability and alignment during SMT placement and reflow, but must remain unconnected in circuit design and layout to prevent unintended coupling or solder bridging.
How does thermal resistance affect real-world power handling?
With Rth(j-a) = 455 K/W, dissipating 275 mW raises junction temperature by ~125 K above ambient. At 25 °C ambient, Tj reaches ~150 °C - the absolute maximum. Derating is required above 25 °C ambient to stay within safe operating limits.
BZX84W-C43F 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):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 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-C43F FAQ
1.How can I place an order for BZX84W-C43F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C43F 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-C43F reliable?
The price and inventory of BZX84W-C43F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C43F is usually 5 days.
3.What payment methods are accepted for BZX84W-C43F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C43F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C43F?
BZX84W-C43F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C43F 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-C43F?
For technical support, including BZX84W-C43F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C43F requirements.
6.How does Aetrix verify that BZX84W-C43F is sourced from the original manufacturer or authorized distributors?
All BZX84W-C43F 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-C43F meets industry standards.
7.What is the process for return or replacement of BZX84W-C43F?
All BZX84W-C43F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C43F, 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-C43F part is unused and in its original packaging.
Return procedure for BZX84W-C43F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C43F Tags
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