My Inquiry
My Account
Nexperia USA Inc. BZX384-B39-QX
- Part No.:
- BZX384-B39-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B39-QX.pdf
- Description:
- DIODE ZENER 39V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,990
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX384-B39-Q from Nexperia is a ±2 % 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-B39-Q datasheet, BZX384-B39-Q pinout, BZX384-B39-Q application, or BZX384-B39-Q equivalent, this page delivers verified electrical parameters, thermal behavior, automotive qualification status, and real-world design context for precision voltage regulation in space-constrained PCB layouts.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a specified 39 V working voltage at IZ = 2 mA, differential resistance of 350 Ω max, and temperature coefficient of +0.05 mV/K - indicating near-zero thermal drift in regulated output. Its non-repetitive peak reverse power dissipation is rated at 40 W for 100 μs pulses.
The device features low reverse leakage (≤130 μA at VR = 31.2 V), junction-to-ambient thermal resistance of 415 K/W on FR4 PCB, and cathode-anode polarity clearly marked by a bar on the SOD323 body. It is designed for stable DC voltage reference under transient-limited conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 39 V nominal at IZ = 2 mA; ±2 % tolerance ensures tight regulation in feedback loops |
| Total Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C; defines maximum continuous DC power handling on standard FR4 |
| Differential Resistance rdif | ≤350 Ω; low dynamic impedance maintains regulation accuracy under load variation |
| Reverse Current IR | ≤130 μA at VR = 31.2 V; minimal leakage preserves efficiency in high-impedance bias networks |
| Non-repetitive Peak Power | 40 W for tp = 100 μs; enables transient surge suppression without failure |
| Junction Temperature Tj | −65 °C to +150 °C; supports operation across automotive under-hood environments |
| AEC-Q101 Qualified | Yes; validated for automotive discrete semiconductor stress testing per AEC standard |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package: 2-terminal, 1.35 mm × 0.85 mm footprint, 0.45 mm height, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Negative terminal; connected to regulated output node or ground return in shunt configuration |
| 2 | Anode (A) | Positive terminal; tied to unregulated input or current-limiting resistor in series |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD tests |
| ±2 % voltage tolerance | Tighter than ±5 % C-series; reduces calibration overhead in precision analog references |
| Low-profile SOD323 package | Enables placement in dense routing zones and compatibility with automated reflow assembly |
| 40 W surge capability | Withstands short-duration transients common in 12 V/24 V vehicle power systems |
| 150 °C max junction temperature | Supports sustained operation in engine control units and ADAS modules without derating |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for microcontroller ADC inputs monitoring battery voltage and door lock status. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 39 V rail for internal LDO pre-regulation and overvoltage clamp. Use Value: Prevents ADC saturation during load-dump events up to 35 V while maintaining <±0.8 V error across −40 °C to +125 °C ambient. |
Use Scenario: Biasing op-amp input stages in 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Precision Zener reference establishing fixed offset for current-sense amplifier common-mode range. Use Value: Enables 0.5 % full-scale linearity over 25-year field life due to low tempco (+0.05 mV/K) and minimal IR drift. |
| Consumer Power Adapter Feedback | Medical Diagnostic Equipment Power Rails |
Use Scenario: Providing secondary-side voltage reference for optocoupler feedback in isolated AC/DC flyback converters. IC Role / Device Role / Timing Role: Zener-based TL431 alternative for cost-sensitive, low-current (<5 mA) regulation paths. Use Value: Reduces BOM count by eliminating external resistive divider while meeting IEC 62368-1 creepage requirements via compact SOD323 layout. |
Use Scenario: Clamping auxiliary supply rails in portable ultrasound imaging front-end ASICs. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting analog front-end from ESD-induced latch-up during probe handling. Use Value: Limits voltage excursions to ≤42 V during 8 kV contact discharge without degradation, verified per IEC 61000-4-2 Level 4. |
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-A39-Q | ±1 % tolerance, lower rdif (≤300 Ω), tighter VZ spread but higher cost | Better suited for high-accuracy bandgap references where <0.4 % error budget is required | Select when absolute voltage stability outweighs cost sensitivity and board space constraints |
| BZX384-C39-Q | ≈±5 % tolerance, higher rdif (≤450 Ω), wider VZ range (37–41 V) | Acceptable for non-critical biasing where ±1.5 V margin is permissible | Choose for cost-driven consumer designs where calibration is performed post-assembly |
Compared with BZX384-B39-Q, the A-series offers superior accuracy for metrology-grade circuits, while the C-series trades precision for economy in general-purpose clamping - making the B-series the optimal balance of performance, qualification, and value for automotive and industrial regulation.
Availability
BZX384-B39-Q is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and medical power management requiring stable component supply with AEC-Q101 traceability and long-term lifecycle support.
Supply support for BZX384-B39-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, headquartered in Nijmegen, Netherlands.
The BZX384-Q series belongs to Nexperia's automotive-qualified Zener diode portfolio, engineered specifically for robust voltage reference and transient protection in harsh-environment electronic control units.
FAQ
What is the maximum continuous forward current rating for BZX384-B39-Q?
The device is not intended for continuous forward conduction; its absolute maximum forward current is 250 mA per limiting values table, but typical operation occurs in reverse breakdown. Forward voltage is 0.9 V at 10 mA pulse (tp ≤ 100 μs), and sustained forward bias risks thermal runaway due to lack of thermal shutdown.
Can BZX384-B39-Q be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging and thermal instability when paralleled. For >300 mW regulation, use a single higher-power Zener or active shunt regulator instead.
How does the 39 V rating translate to actual clamping behavior during transients?
At 2 mA test current, VZ = 39 V; under 40 W surge (100 μs), it clamps at ~42 V (IZSM = 0.7 A). The 350 Ω differential resistance causes ~0.25 V rise per 0.7 mA increase in current, enabling predictable overvoltage limiting within safe operating area.
Is the SOD323 package compatible with standard reflow soldering profiles?
Yes - Nexperia specifies JEDEC J-STD-020-compliant reflow profile for SOD323: peak temperature 260 °C, time above liquidus 60–90 s, ramp rate ≤3 °C/s. Footprint dimensions (1.1 mm × 0.8 mm pads, 0.5 mm spacing) match IPC-7351B density level A.
BZX384-B39-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:
- ±2%
- 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-B39-QX FAQ
1.How can I place an order for BZX384-B39-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B39-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-B39-QX reliable?
The price and inventory of BZX384-B39-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-B39-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B39-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B39-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B39-QX?
BZX384-B39-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B39-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-B39-QX?
For technical support, including BZX384-B39-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B39-QX requirements.
6.How does Aetrix verify that BZX384-B39-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-B39-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-B39-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B39-QX?
All BZX384-B39-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B39-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-B39-QX part is unused and in its original packaging.
Return procedure for BZX384-B39-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B39-QX Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
