My Inquiry
My Account
Nexperia USA Inc. BZX384-C39-QX
- Part No.:
- BZX384-C39-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-C39-QX.pdf
- Description:
- DIODE ZENER 39V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,763
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX384-C39-Q from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 39 V nominal breakdown voltage at 2 mA, 350 Ω maximum differential resistance, and 130 μA reverse current at 37 V, designed for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the BZX384-C39-Q datasheet, BZX384-C39-Q pinout, BZX384-C39-Q application, or BZX384-C39-Q equivalent, this device serves as a low-power, AEC-Q101-qualified Zener for stable clamping in ECU sensor interfaces, infotainment supply monitoring, and body control module voltage supervision where tight thermal coefficient control and surge resilience are required.
Technical Context
This Zener operates in reverse-biased breakdown mode with a temperature coefficient of +0.05 mV/K at IZ = 2 mA, enabling predictable drift compensation across –65 °C to +150 °C ambient. Its non-repetitive peak reverse power dissipation is rated at 40 W for 100 μs pulses, supporting transient suppression in 12 V/24 V automotive systems.
The device exhibits 350 Ω dynamic impedance at 2 mA test current and 45 pF junction capacitance at 0 V, balancing regulation accuracy against high-frequency noise rejection. It is qualified per AEC-Q101 and mounted on FR4 PCB with single-sided copper, delivering 110 K/W junction-to-solder-point thermal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZ) | 37.0 V to 41.0 V at IZ = 2 mA - defines clamping threshold window for 39 V nominal regulation |
| Differential Resistance (rdif) | ≤350 Ω at IZ = 2 mA - determines output voltage stability under load variation |
| Reverse Current (IR) | ≤130 μA at VR = 37 V - ensures low leakage in standby regulation circuits |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - supports ISO 7637-2 pulse 1/2/5a transient suppression |
| Thermal Resistance (Rth(j-sp)) | 110 K/W - enables reliable operation up to 150 °C junction temperature with minimal solder-point heating |
| Package | SOD323 (SC-76) - 1.35 mm × 0.85 mm footprint compatible with high-density automotive PCB layouts |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HTOL, TCT, and HAST testing |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package with cathode-marked end and 0.95 mm lead pitch; total dimensions 1.7 mm × 1.25 mm × 0.95 mm (L × W × H), optimized for reflow and wave soldering per IPC-7351B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-bias polarity must be maintained for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % voltage tolerance | Enables cost-effective selection for non-critical reference points without trimming circuitry |
| 40 W surge rating | Withstands automotive load-dump transients without degradation when used with series current-limiting resistor |
| 150 °C max junction temperature | Supports under-hood placement in engine control units and transmission control modules |
| 110 K/W Rth(j-sp) | Reduces thermal stress during sustained 300 mW dissipation, extending lifetime in sealed enclosures |
| AEC-Q101 qualification | Validates robustness against mechanical shock, humidity, and temperature cycling per automotive standards |
Applications
| Engine Control Unit (ECU) Sensor Reference | Infotainment System Power Monitoring |
|---|---|
Use Scenario: Provides stable 39 V reference for analog-to-digital conversion of throttle position and manifold pressure sensors. IC Role / Device Role / Timing Role: Zener voltage reference supplying bias to op-amp buffer stages in sensor signal conditioning chains. Use Value: Maintains ±0.5 % ADC accuracy over –40 °C to +125 °C ambient due to low 0.05 mV/K temperature coefficient. |
Use Scenario: Monitors 12 V battery rail integrity in head unit power management subsystems. IC Role / Device Role / Timing Role: Overvoltage clamp protecting PMIC inputs during jump-start events or alternator surges. Use Value: Limits rail voltage to ≤41 V using 40 W pulse capability, preventing latch-up in downstream DC-DC controllers. |
| Body Control Module (BCM) Wake-Up Detection | LED Headlamp Driver Voltage Supervision |
Use Scenario: Detects ignition-on transition by sensing voltage rise above 37 V threshold on switched 12 V line. IC Role / Device Role / Timing Role: Threshold detector element feeding comparator input in low-power wake-up circuitry. Use Value: Delivers <1 μA leakage at 11 V, ensuring microamp-level sleep current compliance in ISO 16750-2 Class D systems. |
Use Scenario: Guards LED driver IC enable pin against overvoltage during CAN bus-induced transients. IC Role / Device Role / Timing Role: Fast-response shunt clamp placed between enable rail and ground near driver IC. Use Value: Responds within 100 ns to 300 V/μs transients, limiting enable-line overshoot to <41 V per ISO 16750-2 Pulse 5a. |
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 (38.2 V–39.8 V), 80 Ω rdif at 5 mA | Higher precision needed for feedback loops in switching regulators | Select when tighter regulation is required and cost premium is acceptable |
| MMSZ5240B-TP | ±5 % tolerance (37.05 V–40.95 V), 380 Ω rdif at 20 mA, SOD-123 package | Larger footprint and higher thermal resistance (250 K/W) limit use in space-constrained modules | Use only if SOD-123 compatibility is mandated by legacy layout or procurement policy |
Compared with BZX384-B39-Q, the C-grade offers lower cost and sufficient stability for supervisory functions but sacrifices loop accuracy; versus MMSZ5240B-TP, it delivers superior thermal performance and smaller board area despite identical tolerance, making it preferable for new automotive designs.
Availability
BZX384-C39-Q is available at Aetrix Electronics and suitable for automotive electronic control units, infotainment power monitors, and body control module wake-up detection requiring stable component supply with AEC-Q101 traceability and full production lifecycle support.
Supply support for BZX384-C39-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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BZX384-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive voltage regulation, clamping, and reference applications demanding long-term stability under harsh environmental conditions.
FAQ
What is the maximum continuous power dissipation for BZX384-C39-Q?
The BZX384-C39-Q has a total power dissipation rating of 300 mW at Tamb ≤ 25 °C on FR4 PCB with single-sided copper. Derating is required above 25 °C ambient, following the 415 K/W junction-to-ambient thermal resistance curve; at 85 °C ambient, maximum continuous power drops to approximately 175 mW.
How does the temperature coefficient affect regulation accuracy over automotive temperature ranges?
With a specified temperature coefficient of +0.05 mV/K at IZ = 2 mA, the BZX384-C39-Q exhibits minimal drift: total VZ shift is ~7.5 mV from –40 °C to +125 °C, corresponding to ±0.02 % of nominal 39 V. This ensures stable reference performance without external compensation in most ECU sensor interfaces.
Can BZX384-C39-Q be used in parallel for higher surge handling?
No - Zener diodes exhibit manufacturing spread in VZ and rdif, causing current imbalance and thermal runaway when paralleled. For higher surge capacity, use a single higher-rated device like PESD5V0S1BA or implement external current-sharing resistors, though this degrades regulation accuracy and is not recommended per Nexperia's application guidance.
What is the significance of the 'Q' suffix in BZX384-C39-Q?
Per Nexperia's ordering nomenclature, the 'Q' suffix denotes AEC-Q101 qualification and automotive-grade screening, including extended temperature testing, humidity robustness validation, and failure analysis per JESD47. It distinguishes this part from commercial-grade BZX384-C39 variants not intended for automotive use.
BZX384-C39-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:
- ±5%
- 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-C39-QX FAQ
1.How can I place an order for BZX384-C39-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-C39-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-C39-QX reliable?
The price and inventory of BZX384-C39-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-C39-QX is usually 5 days.
3.What payment methods are accepted for BZX384-C39-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-C39-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-C39-QX?
BZX384-C39-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-C39-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-C39-QX?
For technical support, including BZX384-C39-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-C39-QX requirements.
6.How does Aetrix verify that BZX384-C39-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-C39-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-C39-QX meets industry standards.
7.What is the process for return or replacement of BZX384-C39-QX?
All BZX384-C39-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-C39-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-C39-QX part is unused and in its original packaging.
Return procedure for BZX384-C39-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-C39-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…
