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Nexperia USA Inc. BZX384-A39-QX
- Part No.:
- BZX384-A39-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A39-QX.pdf
- Description:
- DIODE ZENER 39V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,480
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Product details
Overview
BZX384-A39-Q from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 39 V nominal breakdown voltage at 2 mA test current, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides stable reference voltage in low-power biasing, overvoltage protection, and voltage clamping circuits.
For engineers reviewing the BZX384-A39-Q datasheet, BZX384-A39-Q pinout, BZX384-A39-Q application, or BZX384-A39-Q equivalent, this page delivers verified electrical parameters, thermal behavior, automotive qualification status, and real-world design context - not generic diode descriptions.
Technical Context
This device operates as a reverse-biased Zener diode with a specified 39 V working voltage (VZ) at IZ = 2 mA, differential resistance of 350 Ω max, and temperature coefficient of +0.05 mV/K. Its non-repetitive peak reverse power dissipation is 40 W for 100 μs pulses.
Designed for surface-mount operation on FR4 PCBs with single-sided copper, it exhibits Rth(j-a) = 415 K/W and Rth(j-sp) = 110 K/W, enabling reliable thermal management in compact automotive and industrial layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 39 V nominal at IZ = 2 mA; ±1 % tolerance ensures tight regulation in precision reference circuits |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C; defines maximum continuous DC power handling on standard FR4 PCB |
| Differential Resistance | ≤350 Ω at IZ = 2 mA; determines output impedance and regulation sensitivity to load changes |
| Reverse Current | ≤130 μA at VR = 37 V; specifies leakage level before breakdown, critical for low-power standby circuits |
| Peak Pulse Power | 40 W for tp = 100 μs; supports transient overvoltage suppression without failure |
| Junction Temperature | −65 °C to +150 °C; enables operation in under-hood automotive environments and industrial enclosures |
| AEC-Q101 Qualified | Yes; validated for automotive discrete semiconductor stress testing, including HTRB, HTSL, and TC |
Pinout & Package
Package: SOD323 (SC-76), 2-pin surface-mount plastic package with cathode marked by bar on top surface. Dimensions: 2.7 mm × 1.6 mm × 1.1 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity marker (bar) identifies this terminal; carries reverse current during Zener conduction |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path; must be held at lower voltage than cathode for regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % voltage tolerance | Enables high-accuracy voltage references without trimming; reduces calibration overhead in sensor signal chains |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity, and surge robustness |
| 300 mW power rating | Supports stable regulation in space-constrained PCBs while maintaining thermal safety margin on FR4 |
| 40 W non-repetitive pulse rating | Clamps ESD and load-dump transients per ISO 16750-2 without degradation |
| SOD323 footprint | Compatible with standard reflow/wave soldering; occupies <2.8 mm² board area for dense layout integration |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for microcontroller ADC inputs monitoring door lock status and interior lighting feedback. IC Role / Device Role / Timing Role: Zener diode providing stable 39 V reference for voltage divider networks feeding analog comparators and LDO enable thresholds. Use Value: ±1 % tolerance ensures consistent trip-point accuracy across temperature, reducing false fault reporting in CAN-linked BCM firmware. |
Use Scenario: Biasing op-amp input stages in 4–20 mA transmitter circuits measuring pressure or flow in factory automation systems. IC Role / Device Role / Timing Role: Precision shunt reference establishing known headroom above supply rail for rail-to-rail input stage operation. Use Value: Low 130 μA leakage at 37 V minimizes error contribution in µA-level loop-current paths. |
| Automotive Infotainment Power Sequencing | Consumer Appliance Overvoltage Protection |
Use Scenario: Clamping 39 V rail against transient spikes during ignition switching in head unit power supplies. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing 100 μs surges up to 40 W without latch-up or parameter shift. Use Value: AEC-Q101 qualification guarantees no parametric drift after 1000+ thermal cycles in dashboard mounting locations. |
Use Scenario: Protecting microcontroller I/O pins from accidental 48 V supply misconnection in smart home HVAC controllers. IC Role / Device Role / Timing Role: Standby-mode shunt protector conducting only during overvoltage events; zero quiescent current otherwise. Use Value: 350 Ω differential resistance limits clamping voltage overshoot to <42 V during 10 mA fault currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B39-Q | ±2 % tolerance (vs. ±1 %); identical package, power rating, and thermal specs | Acceptable where cost sensitivity outweighs need for tight regulation; higher binning yield lowers unit price | Select when system-level calibration compensates for wider VZ spread; verify worst-case ADC reference error budget |
| MMSZ4704T1G | 39 V nominal, ±5 % tolerance, SOD-123 package, 500 mW Ptot, no AEC-Q101 qualification | Higher power handling but larger footprint and unqualified for automotive use | Prefer for industrial mains-powered equipment needing higher surge margin; avoid in automotive or safety-critical designs |
Compared with BZX384-B39-Q, the A39-Q offers tighter regulation at identical thermal performance; versus MMSZ4704T1G, it trades power headroom for automotive qualification and smaller size - critical for space- and compliance-constrained designs.
Availability
BZX384-A39-Q is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor transmitters, infotainment power sequencing, and consumer appliance overvoltage protection requiring stable component supply across production lifecycles.
Supply support for BZX384-A39-Q 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 logic, discrete, and MOSFET solutions, with leadership in automotive-qualified components.
The BZX384-Q series belongs to Nexperia's automotive Zener diode product line, engineered specifically for AEC-Q101-compliant voltage reference and clamping in harsh-environment electronic control units.
FAQ
What is the maximum reverse current at 37 V for BZX384-A39-Q?
The maximum reverse current (IR) is 130 μA at VR = 37 V and Tj = 25 °C, as specified in Table 9 of the datasheet. This value reflects leakage before breakdown onset and is critical for low-power standby circuit design where quiescent current must remain below 1 µA budgets.
Can BZX384-A39-Q be used in place of a 36 V Zener diode?
No - BZX384-A39-Q is strictly a 39 V device with ±1 % tolerance (38.61 V to 39.39 V). Substituting it for a 36 V Zener would raise regulation voltage by ~8 %, potentially exceeding downstream IC absolute maximum ratings or violating feedback loop setpoints in power supplies.
Is the SOD323 package compatible with standard reflow profiles?
Yes - Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. The recommended footprint (Fig. 12) uses 0.5 mm solder lands and 0.6 mm solder resist openings; peak temperature must not exceed 260 °C for ≤30 seconds to avoid package delamination or marking degradation.
Does BZX384-A39-Q require derating above 25 °C ambient?
Yes - total power dissipation must be linearly derated above 25 °C at 2.4 mW/°C, based on Rth(j-a) = 415 K/W. At 85 °C ambient, maximum allowable Ptot drops to 156 mW. Derating ensures junction temperature stays within the 150 °C limit under continuous DC operation.
BZX384-A39-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±1%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-A39-QX FAQ
1.How can I place an order for BZX384-A39-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A39-QX 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 BZX384-A39-QX reliable?
The price and inventory of BZX384-A39-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-A39-QX is usually 5 days.
3.What payment methods are accepted for BZX384-A39-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A39-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A39-QX?
BZX384-A39-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A39-QX 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 BZX384-A39-QX?
For technical support, including BZX384-A39-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A39-QX requirements.
6.How does Aetrix verify that BZX384-A39-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-A39-QX 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 BZX384-A39-QX meets industry standards.
7.What is the process for return or replacement of BZX384-A39-QX?
All BZX384-A39-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A39-QX, 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 BZX384-A39-QX part is unused and in its original packaging.
Return procedure for BZX384-A39-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A39-QX Tags
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