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Nexperia USA Inc. BZX84W-C39-QF
- Part No.:
- BZX84W-C39-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C39-QF.pdf
- Description:
- DIODE ZENER 39V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,593
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Product details
Overview
BZX84W-C39-QF from Nexperia is a ±5% tolerance Zener diode in SOT323 (SC-70) package, rated for 39 V nominal regulation voltage, 275 mW total power dissipation at 25 °C, and qualified to AEC-Q101 for automotive use. It delivers stable voltage reference in compact high-frequency power supply rails and ESD-protected sensor interfaces.
For engineers reviewing the BZX84W-C39-QF datasheet, BZX84W-C39-QF pinout, BZX84W-C39-QF application, or BZX84W-C39-QF equivalent, this page provides verified Zener voltage, thermal resistance, differential resistance, reverse leakage, and automotive qualification status - all critical for precision biasing and overvoltage clamping design validation.
Technical Context
This Zener operates in reverse breakdown with a nominal 39 V working voltage at IZ = 2 mA, exhibiting 130 Ω typical differential resistance and +36.4 mV/K temperature coefficient. Its low 0.7 pF capacitance at 1 MHz enables minimal signal distortion in RF-coupled protection circuits.
The device features a three-terminal SOT323 package with anode (Pin 1), not-connected (Pin 2), and cathode (Pin 3), supporting surface-mount reflow assembly on FR4 PCBs. Thermal resistance from junction to ambient is 455 K/W under standard single-sided copper footprint conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 37.0 V to 41.0 V at IZ = 2 mA - defines regulation window for precision voltage clamping |
| Differential Resistance rdif | 130 Ω typical at IZ = 2 mA - determines output impedance and load regulation error |
| Reverse Leakage IR | 50 nA max at VR = 27.3 V - ensures minimal standby current in high-impedance bias networks |
| Total Power Dissipation Ptot | 275 mW at Tamb = 25 °C on FR4 - sets maximum continuous DC or low-duty-cycle pulse handling capability |
| Thermal Resistance Rth(j-a) | 455 K/W - quantifies junction-to-ambient heat rise per watt, critical for derating above 25 °C |
| Forward Voltage VF | 0.9 V max at IF = 10 mA - limits forward conduction loss in dual-direction clamp configurations |
| Non-repetitive Peak Power | 40 W at tp = 100 µs - supports transient surge suppression without permanent degradation |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 1.3 mm × 1.8 mm footprint, 0.65 mm pitch, and 0.25 mm profile - optimized for space-constrained automotive control modules and portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node during Zener operation |
| 2 | Not Connected (n.c.) | Internal die pad with no electrical connection - must remain unconnected in PCB layout |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node to enable Zener breakdown |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| ±5% Zener voltage tolerance | Enables cost-effective regulation where tight voltage accuracy is secondary to robustness |
| Low 0.7 pF junction capacitance | Minimizes signal coupling and phase shift in high-frequency feedback paths and RF detector circuits |
| 200 mA maximum forward current | Supports bidirectional transient suppression when used with series resistor in AC-coupled lines |
| 150 °C maximum junction temperature | Permits operation in under-hood environments and thermally dense power management IC layouts |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for analog-to-digital converter input scaling in door module microcontrollers. IC Role / Device Role / Timing Role: Zener diode providing stable 39 V reference for resistive divider network feeding ADC reference pin. Use Value: Maintains <±1% full-scale accuracy across −40 °C to +125 °C ambient due to AEC-Q101 thermal stability and low tempco drift. |
Use Scenario: Overvoltage clamp protecting 24 V industrial current-loop transmitter outputs. IC Role / Device Role / Timing Role: Reverse-biased Zener shunting transients above 39 V to ground before reaching op-amp output stage. Use Value: Limits peak voltage to 41 V with <130 Ω dynamic impedance, preventing latch-up in rail-to-rail output amplifiers. |
| USB-C Power Delivery Protection | High-Frequency RF Detector Biasing |
Use Scenario: Input-stage surge suppression in USB-C port controller ICs handling up to 20 V PD negotiation. IC Role / Device Role / Timing Role: Fast-response Zener clamping transient spikes induced by hot-plug events on VBUS line. Use Value: Absorbs 40 W non-repetitive surges (100 µs) without parametric shift, preserving downstream USB-PD PHY integrity. |
Use Scenario: DC bias point stabilization for Schottky diode RF envelope detectors operating at 2.4 GHz ISM band. IC Role / Device Role / Timing Role: Low-capacitance (0.7 pF) Zener establishing fixed reverse bias on detector diode anode. Use Value: Enables >10 dBm input power handling while maintaining <0.1 dB insertion loss and minimal harmonic distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C39-Q | Same electrical specs but unmarked variant; lacks 'F' suffix indicating tape-and-reel packaging traceability | No functional difference; suitable for non-automotive prototyping or low-volume evaluation | Select when full AEC-Q101 traceability and production lot documentation are not required |
| MMSZ4705T1G | 39 V ±5%, 500 mW rating, SOD-123 package - higher power but larger footprint and 1000 pF capacitance | Better for high-energy surge suppression; unsuitable for RF or space-constrained designs | Choose only if thermal margin exceeds 275 mW requirement and board area permits 2.7× larger package |
Compared with BZX84W-C39-QF, the BZX84W-C39-Q omits packaging traceability while retaining identical Zener performance, whereas MMSZ4705T1G trades compact size and RF suitability for higher power handling and larger board footprint.
Availability
BZX84W-C39-QF is available at Aetrix Electronics and suitable for automotive body control modules, industrial 4–20 mA transmitters, USB-C power delivery protection circuits, and high-frequency RF detector biasing requiring stable component supply and AEC-Q101 compliance.
Supply support for BZX84W-C39-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-performance, reliable discrete, logic, and MOSFET devices, with leadership in automotive-qualified components.
The BZX84W-Q series targets automotive and industrial voltage regulation needs, delivering AEC-Q101-compliant Zener diodes in ultra-small SOT323 packages for space- and reliability-critical applications.
FAQ
What is the maximum reverse voltage the BZX84W-C39-QF can withstand before breakdown?
The BZX84W-C39-QF has a nominal Zener voltage of 39 V with a guaranteed range of 37.0 V to 41.0 V at 2 mA test current. Breakdown begins within this band; operation above 41.0 V risks exceeding absolute maximum ratings and may cause irreversible damage if sustained beyond thermal limits.
Is Pin 2 electrically connected internally?
No - Pin 2 is explicitly designated "not connected" (n.c.) in the official Nexperia pinning diagram and must remain unconnected on the PCB. It serves only as a mechanical support pad and carries no internal bond wire or die connection.
How does the ±5% tolerance affect regulation accuracy in a 24 V system?
In a 24 V system using BZX84W-C39-QF as a clamp, the ±5% tolerance means the actual clamping threshold falls between 37.0 V and 41.0 V. This ensures safe margin above 24 V while allowing design flexibility - e.g., selecting 39 V avoids false triggering during normal 24 V transients up to ±10%.
Can this Zener be used in parallel for higher power handling?
No - Zener diodes exhibit manufacturing variation in VZ, causing current imbalance and thermal runaway when paralleled. The BZX84W-C39-QF is rated for 275 mW single-device operation; higher power requires a single higher-rated part like MMSZ4705T1G or active regulation circuitry.
BZX84W-C39-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):
- 39 V
- Tolerance:
- ±5.13%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-C39-QF FAQ
1.How can I place an order for BZX84W-C39-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C39-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-C39-QF reliable?
The price and inventory of BZX84W-C39-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-C39-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-C39-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C39-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C39-QF?
BZX84W-C39-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C39-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-C39-QF?
For technical support, including BZX84W-C39-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C39-QF requirements.
6.How does Aetrix verify that BZX84W-C39-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-C39-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-C39-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-C39-QF?
All BZX84W-C39-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C39-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-C39-QF part is unused and in its original packaging.
Return procedure for BZX84W-C39-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C39-QF Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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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
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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