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Nexperia USA Inc. BZX384-A39X
- Part No.:
- BZX384-A39X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A39X.pdf
- Description:
- DIODE ZENER 39V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,395
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Product details
Overview
BZX384-A39X 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, with 300 mW total power dissipation and 350 Ω maximum differential resistance. It operates across −65 °C to +150 °C ambient range and serves as a precision reference or overvoltage clamp in low-power analog supply rails.
For engineers reviewing the BZX384-A39X datasheet, BZX384-A39X pinout, BZX384-A39X application, or BZX384-A39X equivalent, key selection criteria include its tight ±1 % tolerance, low 350 Ω dynamic impedance at 2 mA, 130 μA reverse current at 29.4 V, and thermal resistance of 415 K/W in free air - all critical for stable biasing and voltage reference accuracy in space-constrained designs.
Technical Context
This device functions as a two-terminal silicon Zener diode operating in reverse breakdown mode, delivering a stable 39 V reference with temperature coefficient of +0.05 mV/K at IZ = 2 mA. Its junction-to-ambient thermal resistance (415 K/W) and non-repetitive peak reverse power capability (40 W, tp = 100 μs) define its transient surge handling and steady-state thermal limits.
The SOD323 package enables surface-mount integration with minimal PCB footprint while maintaining electrical performance under FR4 board conditions (single-sided copper, tin-plated). Cathode marking via bar aligns with standard polarity identification for automated assembly and manual inspection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZ) | 38.61 V to 39.39 V at IZ = 2 mA - ensures ±1 % regulation accuracy for precision reference use |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power in standard FR4 layout |
| Differential Resistance (rdif) | ≤350 Ω at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | 130 μA at VR = 29.4 V - defines leakage-induced error in high-impedance bias networks |
| Non-repetitive Peak Reverse Power (PZSM) | 40 W for tp = 100 μs - supports transient overvoltage clamping without failure |
| Junction Temperature (Tj) | −65 °C to +150 °C - confirms operation in extended industrial environments |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA - specifies forward conduction drop during polarity-check or ESD protection paths |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 1.35 mm × 0.85 mm body size and 0.45 mm lead pitch. Cathode identified by molded bar marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Negative terminal in reverse-bias regulation; marked with bar on package top surface |
| 2 | Anode (A) | Positive terminal; connects to ground or lower-potential node in shunt regulator configuration |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % voltage tolerance | Enables direct replacement in circuits requiring tight reference stability without trimming |
| Low 350 Ω dynamic impedance | Maintains <0.5 % output variation across 0.5–5 mA load current changes |
| 40 W non-repetitive surge rating | Clamps 100 μs transients up to 40 V × 1 A without degradation |
| SOD323 footprint compatibility | Matches JEDEC SC-76 standard for automated pick-and-place and reflow soldering |
| −65 °C to +150 °C operating range | Supports deployment in automotive under-hood, industrial motor control, and outdoor IoT nodes |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
|
Use Scenario: Providing stable 39 V reference for ADC biasing or op-amp feedback in a 48 V telecom power module. IC Role / Device Role / Timing Role: Shunt voltage reference regulating feedback node against input ripple and load variation. Use Value: ±1 % tolerance and 350 Ω rdif ensure reference drift remains below 0.35 V over 10–100 μA load shifts. |
Use Scenario: Clamping transient spikes on a 36 V CAN bus interface line exposed to load-dump events. IC Role / Device Role / Timing Role: Passive overvoltage clamp absorbing 100 μs surges up to 40 W without latch-up. Use Value: 40 W PZSM rating allows safe suppression of ISO 7637-2 Pulse 5a surges without derating. |
| Signal Level Translation | Current Source Biasing |
|
Use Scenario: Setting threshold voltage for a comparator monitoring battery voltage in a 3.7 V Li-ion pack with 39 V reference divider. IC Role / Device Role / Timing Role: Precision voltage node in resistive divider network defining trip point accuracy. Use Value: 130 μA IR at 29.4 V minimizes divider current error, preserving >12-bit effective resolution. |
Use Scenario: Establishing constant current for LED biasing in an optical sensor circuit powered from 42 V rail. IC Role / Device Role / Timing Role: Voltage reference element in a cascode current mirror topology. Use Value: +0.05 mV/K temperature coefficient reduces current drift to <0.2 % over −40 °C to +85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5245BS | 39 V ±5 % tolerance, 200 mW Ptot, 700 Ω rdif at 20 mA | Higher tolerance and impedance reduce reference accuracy in precision analog circuits | Select when cost sensitivity outweighs regulation tightness and thermal margin is constrained |
| Vishay BZX384-B39 | 39 V ±2 % tolerance, identical SOD323 package and 300 mW rating | Looser tolerance increases reference uncertainty but maintains same surge and thermal behavior | Choose where ±2 % is acceptable and inventory consolidation across A/B grades simplifies procurement |
Compared with BZX384-A39X, MMBZ5245BS trades tighter tolerance and lower impedance for lower power rating and higher leakage, while BZX384-B39 retains identical thermal and surge performance but relaxes voltage accuracy - making the A-grade optimal for metrology-grade references and the B-grade suitable for general-purpose clamping.
Availability
BZX384-A39X is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, and signal-level translation requiring stable component supply in industrial automation, telecom infrastructure, and sensor interface designs.
Supply support for BZX384-A39X 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, headquartered in Nijmegen, Netherlands.
The BZX384 series belongs to Nexperia's precision Zener regulator product line, engineered specifically for low-power, space-constrained applications demanding tight voltage tolerance and robust surge immunity in consumer, industrial, and communications equipment.
FAQ
What is the maximum continuous reverse current the BZX384-A39X can sustain?
The BZX384-A39X has no specified maximum continuous reverse current; instead, its steady-state limit is defined by power dissipation. At 25 °C ambient on FR4 PCB, it sustains up to 7.7 mA (300 mW ÷ 39 V) continuously without exceeding 300 mW Ptot. Derating applies above 25 °C per Rth(j-a) = 415 K/W.
Does the BZX384-A39X support wave soldering?
Yes - Nexperia provides dedicated wave soldering footprint guidelines (Fig. 13) for the SOD323 package, specifying 2.75 mm transport direction length, 1.2 mm solder land width, and 5 mm occupied area. Thermal profile must limit peak temperature to ≤260 °C for ≤10 s to avoid package damage.
How does the temperature coefficient affect regulation accuracy over temperature?
With SZ = +0.05 mV/K at IZ = 2 mA, the BZX384-A39X exhibits +1.95 mV/°C drift - resulting in ±19.5 mV (±0.05 %) change over a 100 °C range. This low drift preserves reference integrity in applications like sensor excitation where thermal stability is critical.
Can BZX384-A39X be used in series for higher voltage regulation?
No - series connection is not recommended. Zener diodes exhibit manufacturing spread in dynamic impedance and temperature coefficient; cascading introduces unpredictable voltage division, thermal runaway risk, and degraded regulation accuracy. Use a single higher-voltage Zener or active regulation instead.
BZX384-A39X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384
- 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):
- 75 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-A39X FAQ
1.How can I place an order for BZX384-A39X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A39X 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-A39X reliable?
The price and inventory of BZX384-A39X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-A39X is usually 5 days.
3.What payment methods are accepted for BZX384-A39X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A39X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A39X?
BZX384-A39X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A39X 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-A39X?
For technical support, including BZX384-A39X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A39X requirements.
6.How does Aetrix verify that BZX384-A39X is sourced from the original manufacturer or authorized distributors?
All BZX384-A39X 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-A39X meets industry standards.
7.What is the process for return or replacement of BZX384-A39X?
All BZX384-A39X units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A39X, 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-A39X part is unused and in its original packaging.
Return procedure for BZX384-A39X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A39X Tags
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MM5Z5V1ST1G
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