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Nexperia USA Inc. BZX84W-B43-QF
- Part No.:
- BZX84W-B43-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B43-QF.pdf
- Description:
- DIODE ZENER 43V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,829
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Product details
Overview
BZX84W-B43-QF from Nexperia is a ±2 % tolerance Zener voltage regulator diode with 43 V nominal breakdown voltage, 375 Ω differential resistance at IZ = 2 mA, and 41.2 mV/K temperature coefficient, housed in SOT323 (SC-70) package for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the BZX84W-B43-QF datasheet, BZX84W-B43-QF pinout, BZX84W-B43-QF application, or BZX84W-B43-QF equivalent, this device supports AEC-Q101-compliant designs requiring stable 43 V regulation under transient surge conditions up to 40 W non-repetitive peak reverse power.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 43 V reference across its cathode-anode terminals, with low 375 Ω dynamic impedance ensuring minimal voltage deviation under load current variation. Its 41.2 mV/K positive temperature coefficient compensates for thermal drift in high-temperature automotive environments.
The device delivers 40 W non-repetitive peak reverse power dissipation for 100 µs pulses and sustains 275 mW steady-state power on FR4 PCB with single-sided copper. It exhibits 0.6 pF junction capacitance at 1 MHz and 0 V bias, enabling use in high-frequency noise suppression circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V nominal, ±2 % tolerance (42.1–43.9 V range), 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, enables predictable thermal drift compensation in wide-temperature automotive systems. |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 µs, supports transient surge suppression without failure. |
| Junction Capacitance (Cd) | 0.6 pF at f = 1 MHz, VR = 0 V, ensures minimal signal loading in RF-coupled protection paths. |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA, guarantees low conduction loss during forward-biased operation. |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on standard FR4 PCB, sets continuous thermal design boundary. |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, optimized for high-density automotive PCB layouts and reflow/wave soldering per IPC-7095 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in regulation path. |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or solder mask required. |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node for Zener clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, HAST, and ESD testing per JESD47. |
| ±2 % Zener voltage tolerance | Enables tighter regulation margins than ±5 % variants, reducing need for post-regulation trimming. |
| Low 0.6 pF junction capacitance | Minimizes high-frequency signal distortion in EMI filter and RF detector applications. |
| 40 W non-repetitive peak power | Handles ISO 7637-2 pulse 1/2/5a transients without degradation in 12 V/24 V vehicle networks. |
| 150 °C maximum junction temperature | Supports operation in engine bay and powertrain control modules without derating below −40 °C to +125 °C ambient. |
Applications
| Automotive Body Control Module (BCM) | Infotainment Power Supply Rail |
|---|---|
Use Scenario: Clamping 43 V transients induced by load dump in BCM microcontroller supply lines. IC Role / Device Role / Timing Role: Zener clamp protecting 3.3 V LDO input stage from >40 V surges. Use Value: Prevents LDO destruction during ISO 16750-2 load-dump events while maintaining <10 ns response time. |
Use Scenario: Providing stable 43 V reference for audio amplifier DC offset detection circuitry. IC Role / Device Role / Timing Role: Precision voltage reference for comparator-based rail monitoring. Use Value: Enables ±0.86 V (2 %) reference accuracy over −40 °C to +105 °C, eliminating calibration drift. |
| ADAS Camera Module ESD Protection | Electric Power Steering (EPS) Sensor Interface |
Use Scenario: High-frequency transient suppression on MIPI CSI-2 data lines exposed to board-level ESD. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp absorbing 8 kV HBM ESD pulses. Use Value: Limits line voltage to ≤45 V during ESD event without distorting 1.5 Gbps video signals. |
Use Scenario: Overvoltage protection for Hall-effect sensor supply in EPS motor position feedback loop. IC Role / Device Role / Timing Role: Fail-safe voltage limiter preventing sensor IC latch-up during battery reversal. Use Value: Withstands 24 V reverse polarity and 40 V surge while maintaining <1 µA leakage at 35 V. |
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 | ±5 % tolerance (40–46 V range), 400 Ω rdif, same package and PZSM. | Acceptable where system-level tolerance budgets allow wider regulation window. | Select for cost-sensitive non-safety-critical subsystems where 43 V ±5 % meets functional safety requirements. |
| MMSZ43ET1G | ±5 % tolerance, 43 V nominal, SOD-123 package, 500 mW Ptot, no AEC-Q101 qualification. | Larger footprint, higher thermal resistance (Rth(j-a) = 625 K/W), not automotive-qualified. | Use only in industrial or consumer applications where AEC-Q101 compliance and SOT323 density are not required. |
Compared with BZX84W-C43-Q, the BZX84W-B43-QF offers tighter 2 % tolerance and lower dynamic impedance for improved regulation accuracy; versus MMSZ43ET1G, it provides AEC-Q101 validation and superior thermal performance in space-constrained automotive PCBs.
Availability
BZX84W-B43-QF is available at Aetrix Electronics and suitable for automotive body electronics, infotainment power management, and ADAS sensor interface designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84W-B43-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 focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.
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 harsh automotive environments.
FAQ
What is the maximum non-repetitive peak reverse power rating for BZX84W-B43-QF?
The BZX84W-B43-QF is rated for 40 W non-repetitive peak reverse power dissipation at tp = 100 µs and Tamb = 25 °C, validated per IEC 60134 absolute maximum ratings. This value decreases with longer pulse durations per Figure 1 in the datasheet, and derating is required above 25 °C ambient.
How does the 41.2 mV/K temperature coefficient affect regulation accuracy over temperature?
The +41.2 mV/K coefficient means the Zener voltage increases by 41.2 mV per Kelvin rise in junction temperature at IZ = 2 mA. Over a −40 °C to +125 °C ambient range, this contributes approximately ±6.8 V drift, which is mitigated by system-level thermal design and tolerance stacking in automotive applications.
Is Pin 2 truly unconnected, and can it be left floating on the PCB?
Yes, Pin 2 is internally not connected (n.c.) per Table 2 of the datasheet. It must remain electrically floating-no solder mask opening, via, or trace connection is permitted. The SOT323 footprint in Figure 9 shows no pad assigned to Pin 2, confirming its isolation.
Does BZX84W-B43-QF meet automotive qualification requirements for under-hood applications?
Yes, the BZX84W-B43-QF is qualified to AEC-Q101 Rev D for discrete semiconductors, including stress tests for high-temperature operating life (HTOL), temperature cycling (TC), and humidity testing (HAST). Its 150 °C max junction temperature and −55 °C to +150 °C storage range support under-hood deployment.
BZX84W-B43-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:
- ±2.09%
- 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-B43-QF FAQ
1.How can I place an order for BZX84W-B43-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B43-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-B43-QF reliable?
The price and inventory of BZX84W-B43-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-B43-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B43-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B43-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B43-QF?
BZX84W-B43-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B43-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-B43-QF?
For technical support, including BZX84W-B43-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B43-QF requirements.
6.How does Aetrix verify that BZX84W-B43-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B43-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-B43-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B43-QF?
All BZX84W-B43-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B43-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-B43-QF part is unused and in its original packaging.
Return procedure for BZX84W-B43-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B43-QF Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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