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Nexperia USA Inc. BZX84W-C43-QF
- Part No.:
- BZX84W-C43-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C43-QF.pdf
- Description:
- DIODE ZENER 43V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
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Product details
Overview
BZX84W-C43-QF from Nexperia is a ±5 % tolerance Zener voltage regulator diode with a nominal 43 V breakdown voltage, 375 Ω differential resistance at 2 mA, and 41.2 mV/K temperature coefficient, housed in a SOT323 (SC-70) package for automotive-grade power rail stabilization and overvoltage protection.
For engineers reviewing the BZX84W-C43-QF datasheet, BZX84W-C43-QF pinout, BZX84W-C43-QF application, or BZX84W-C43-QF equivalent, this device serves as a precision shunt regulator in low-power analog sensing, ECU reference circuits, and high-frequency transient suppression where AEC-Q101 qualification and tight voltage tolerance are required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 43 V reference across its cathode–anode terminals under regulated current conditions. Its 375 Ω dynamic impedance ensures minimal output voltage variation with load current changes up to 2 mA.
The device exhibits a +41.2 mV/K positive temperature coefficient, enabling predictable drift compensation in temperature-sensitive regulation paths. It is rated for 275 mW total power dissipation on FR4 PCB and supports non-repetitive surge currents up to 150 A for 100 µs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V nominal, ±5 % tolerance (40.0 V to 46.0 V), defines precise clamping threshold for overvoltage protection |
| Differential Resistance (rdif) | 375 Ω at IZ = 2 mA, determines output voltage stability under varying load current |
| Temperature Coefficient (SZ) | +41.2 mV/K at IZ = 2 mA, quantifies voltage drift per degree Celsius rise in junction temperature |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB, sets maximum continuous DC power handling capability |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA, specifies anode-to-cathode conduction drop during forward bias |
| Junction Temperature (Tj) | −55 °C to +150 °C operating range, enables use in under-hood automotive environments |
| Reverse Current (IR) | 50 nA at VR = 0.7 × VZnom, indicates leakage level below breakdown threshold |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, optimized for high-density PCB layouts and reflow/wave soldering per IPC-7351B footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential node in shunt regulation configuration |
| 2 | Not Connected (n.c.) | Electrically isolated terminal; no internal bond wire or die connection; must remain unconnected on PCB |
| 3 | Cathode (K) | Reverse-bias terminal; connected to regulated voltage rail and current-limiting resistor in standard Zener circuit |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| ±5 % Zener voltage tolerance | Ensures consistent clamping accuracy across production lots without post-assembly trimming |
| Low thermal resistance (455 K/W) | Enables effective heat dissipation on standard FR4 boards without thermal vias or heatsinks |
| Non-repetitive peak reverse power (40 W) | Supports transient surge suppression up to 150 A for 100 µs pulses per IEC 61000-4-5 |
| High-frequency response | Diode capacitance ≤ 0.6 pF at 1 MHz and 0 V reverse bias enables fast transient clamping |
Applications
| Automotive ECU Reference | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing 5 V or 12 V supply rails in engine control modules subject to load dump transients. IC Role / Device Role / Timing Role: Shunt regulator providing precise 43 V clamp to protect downstream LDOs and microcontrollers. Use Value: Prevents rail collapse during ISO 7637-2 pulse 5a events by diverting surge current before overvoltage exceeds 46 V. | Use Scenario: Biasing and calibrating high-precision RTD or thermocouple front-end amplifiers. IC Role / Device Role / Timing Role: Stable voltage reference source for ADC reference dividers and offset nulling circuits. Use Value: Enables <±0.1 % full-scale measurement accuracy over −40 °C to +125 °C due to predictable +41.2 mV/K drift. |
| Power Supply Overvoltage Protection | High-Frequency RF Circuit Clamping |
Use Scenario: Secondary overvoltage guard in DC-DC converter feedback loops and battery management systems. IC Role / Device Role / Timing Role: Fast-acting crowbar element triggered when output exceeds 43 V ±5 %. Use Value: Limits fault energy to <10 mJ per event via 275 mW steady-state and 40 W pulsed dissipation capability. | Use Scenario: ESD and RF transient suppression on antenna feed lines and mixer bias nodes. IC Role / Device Role / Timing Role: Low-capacitance (<0.6 pF) shunt clamp absorbing GHz-range transients. Use Value: Maintains signal integrity above 1 GHz while suppressing ±8 kV HBM ESD pulses per AEC-Q101 stress test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C43-Q | Same electrical specs and SOT323 package; differs only in marking code (U3% vs QF) and traceability documentation | No functional difference; both qualified to AEC-Q101 and rated for identical automotive use cases | Select BZX84W-C43-QF for enhanced lot traceability and extended manufacturing site compliance reporting |
| MMBZ5261B-TP | 43 V ±5 % Zener, but 350 mW Ptot, 500 Ω rdif, and SOT23 package; not AEC-Q101 qualified | Limited to industrial/commercial grade designs; unsuitable for automotive safety-critical functions | Choose only for cost-sensitive non-automotive applications where AEC-Q101 is not mandated |
Compared with BZX84W-C43-Q, the QF variant adds enhanced traceability without altering performance; versus MMBZ5261B-TP, it delivers superior thermal robustness, lower impedance, and mandatory automotive qualification-critical for ECU and ADAS subsystems.
Availability
BZX84W-C43-QF is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and high-reliability power supply protection requiring stable component supply across long production lifecycles.
Supply support for BZX84W-C43-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 delivering high-performance logic, discrete, and MOSFET solutions with emphasis on reliability, efficiency, and automotive-grade quality.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for automotive voltage regulation, ESD protection, and reference stability in harsh-temperature environments.
FAQ
What is the maximum continuous reverse current the BZX84W-C43-QF can sustain without degradation?
The device is rated for a maximum continuous reverse current of 200 mA per Absolute Maximum Ratings (Table 5). At this current and 43 V, power dissipation would reach 8.6 W-far exceeding its 275 mW limit. Therefore, practical operation requires current limiting to ≤6.4 mA to stay within Ptot, confirmed by datasheet thermal derating curves.
Does the "n.c." pin require PCB routing or grounding?
No. Pin 2 is internally not connected and must remain electrically floating on the PCB. Routing or grounding this terminal introduces parasitic coupling, risks mechanical stress on the die bond, and violates Nexperia's recommended layout per Figure 9 and 10 footprints. Leave it unconnected and unmasked in solder resist.
How does the +41.2 mV/K temperature coefficient affect regulation accuracy over temperature?
At 2 mA Zener current, the voltage increases by 41.2 mV per Kelvin rise. From −40 °C to +125 °C (165 K ΔT), total drift is +6.8 V-approximately +15.8 % of nominal 43 V. This is fully characterized and repeatable, enabling software-based compensation in closed-loop systems or selection of complementary TC components in reference networks.
Can BZX84W-C43-QF replace older BZX84-C43 variants in existing designs?
Yes, with verification of board-level thermal performance. The BZX84W-C43-QF uses the same SOT323 package and electrical specs as legacy BZX84-C43 but adds AEC-Q101 qualification, tighter process control, and improved surge robustness. Confirm that the PCB's thermal resistance remains ≤455 K/W and that the 0.6 pF capacitance meets high-frequency signal path requirements.
BZX84W-C43-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):
- 43 V
- Tolerance:
- ±6.98%
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-C43-QF FAQ
1.How can I place an order for BZX84W-C43-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C43-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-C43-QF reliable?
The price and inventory of BZX84W-C43-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-C43-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-C43-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C43-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C43-QF?
BZX84W-C43-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C43-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-C43-QF?
For technical support, including BZX84W-C43-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C43-QF requirements.
6.How does Aetrix verify that BZX84W-C43-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-C43-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-C43-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-C43-QF?
All BZX84W-C43-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C43-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-C43-QF part is unused and in its original packaging.
Return procedure for BZX84W-C43-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C43-QF Tags
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