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Nexperia USA Inc. BZX38450-B4V3X
- Part No.:
- BZX38450-B4V3X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B4V3X.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,525
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Product details
Overview
BZX38450-B4V3X from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, providing precise 4.3 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW power dissipation, and 95 Ω dynamic resistance at 5 mA - optimized for battery-powered sensor biasing and low-power reference circuits.
For engineers reviewing the BZX38450-B4V3X datasheet, BZX38450-B4V3X pinout, BZX38450-B4V3X application, or BZX38450-B4V3X equivalent, this page delivers verified electrical parameters, thermal behavior, cathode/anode terminal mapping, and direct-fit alternatives for portable and space-constrained designs requiring stable sub-5 V regulation.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining 4.3 V across its terminals under reverse-bias conditions when current exceeds the knee threshold (~50 µA). Its low test current enables minimal quiescent draw in always-on monitoring nodes.
It exhibits a negative temperature coefficient of −2.7 mV/K and 150 pF junction capacitance at 0 V, making it suitable for DC reference generation but not high-frequency noise suppression without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 4.3 V at IZ = 50 µA - defines primary regulation point for ultra-low-current bias networks |
| Voltage Tolerance | ±2 % - ensures tight output stability across production lots without trimming |
| Differential Resistance (rdiff) | 95 Ω at IZ = 5 mA - determines load regulation error under varying sink current |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - enables use as low-drop rectifier or ESD clamp in dual-role layouts |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets maximum continuous reverse power in FR4 PCB mounting |
| Junction-to-Ambient Thermal Resistance | 415 K/W - limits usable power in still-air environments without heatsinking |
| Reverse Leakage Current (IR) | ≤ 4.0 µA at VR = 2.0 V - confirms low standby loss in battery-critical applications |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic case measuring 1.7 mm × 1.25 mm × 0.95 mm with 1.3 mm lead pitch; cathode identified by marking bar on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated voltage node; polarity-sensitive connection for reverse-bias operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - reduces system standby current by >90 % versus standard 5 mA Zeners |
| Tight voltage tolerance | ±2 % B-series grading - eliminates need for post-assembly calibration in precision references |
| Optimized leakage profile | Controlled IR rise per AN90031 - improves transient response during fast turn-on in switching regulators |
| Small-footprint packaging | SOD323 outline - enables placement in dense IoT sensor modules where board area < 2 mm² is constrained |
Applications
| Portable Sensor Biasing | Low-Power MCU Reference |
|---|---|
|
Use Scenario: Providing stable 4.3 V bias to analog front-end of battery-operated environmental sensors (e.g., CO₂, humidity). IC Role / Device Role / Timing Role: Shunt voltage reference for ADC input scaling and op-amp offset compensation. Use Value: Enables 12-bit measurement accuracy with < 0.5 % full-scale drift over −40 °C to +85 °C due to tight ±2 % VZ tolerance and −2.7 mV/K TC. |
Use Scenario: Supplying clean reference voltage to internal bandgap circuitry of ultra-low-power microcontrollers (e.g., ARM Cortex-M0+ in sleep mode). IC Role / Device Role / Timing Role: Low-quiescent regulator for internal LDO enable logic and clock oscillator biasing. Use Value: Draws only 50 µA at regulation, extending coin-cell life beyond 5 years in maintenance-free edge nodes. |
| USB-C PD Auxiliary Regulation | Industrial Signal Conditioning |
|
Use Scenario: Generating isolated 4.3 V rail for USB-C power delivery controller auxiliary logic and level-shifting circuitry. IC Role / Device Role / Timing Role: Secondary shunt regulator downstream of buck converter, stabilizing control voltage during dynamic load transients. Use Value: 95 Ω rdiff maintains < 5 mV output variation across 0–2 mA load swing, ensuring reliable PD negotiation timing. |
Use Scenario: Setting threshold voltage for 4–20 mA loop transmitter overvoltage protection and zero-point calibration. IC Role / Device Role / Timing Role: Precision clamping element in analog signal path, referenced against 2.5 V DAC output. Use Value: 150 pF junction capacitance avoids phase shift in 10 kHz signal bandwidth, preserving loop stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B4V3 | Same 4.3 V nominal, ±2 %, but rated for 500 mW Ptot and uses SOD123 package (2.7 × 1.6 mm) | Higher power handling supports 10× higher surge current but requires 2.3× more PCB area | Select when thermal margin >100 °C/W is needed or reflow compatibility with legacy SOD123 footprints is required |
| MMSZ4V3T1G | 4.3 V, ±5 %, 500 mW, SOD-123, rdiff = 100 Ω at 5 mA, Tj max = 150 °C | Looser tolerance increases reference uncertainty; larger package eases hand-soldering but reduces density | Choose for cost-sensitive industrial controls where ±5 % regulation is acceptable and manual assembly occurs |
Compared with BZX38450-B4V3X, BZX384-B4V3 offers greater thermal headroom in larger packages, while MMSZ4V3T1G trades precision for broader availability and higher surge rating - neither matches the 50 µA test current optimization or SOD323 footprint efficiency of the original.
Availability
BZX38450-B4V3X is available at Aetrix Electronics and suitable for portable sensor biasing, low-power MCU reference, USB-C PD auxiliary regulation, and industrial signal conditioning requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX38450-B4V3X 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, with manufacturing in Europe and Asia.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for energy-constrained applications where regulation stability at microampere bias currents is critical.
FAQ
What is the maximum reverse current before breakdown for BZX38450-B4V3X?
The device begins regulating near 4.3 V at ~50 µA; below that, reverse current remains ≤0.1 µA up to 2.0 V. At 3.5 V reverse bias, typical leakage is <0.05 µA - confirming sharp knee behavior essential for accurate low-voltage threshold detection.
Can BZX38450-B4V3X be used in series for higher voltage regulation?
No - series connection introduces mismatched temperature coefficients and dynamic resistance, causing unstable combined regulation. For >5 V needs, select single-device variants like BZX38450-B10 or BZX38450-C10 instead of cascading 4.3 V units.
Is the SOD323 package compatible with standard reflow profiles?
Yes - the SOD323 footprint aligns with IPC-7351B medium-density guidelines. Recommended peak reflow temperature is 260 °C for ≤30 seconds; thermal resistance data assumes tin-plated FR4 with single-sided 1 oz copper, matching common production boards.
How does the −2.7 mV/K temperature coefficient affect long-term accuracy?
Over −40 °C to +85 °C, the total VZ drift is approximately ±0.34 V (−2.7 mV/K × 125 K), resulting in ±8 % deviation from nominal 4.3 V. For tighter stability, pair with a thermistor-compensated network or use in ambient-controlled enclosures.
BZX38450-B4V3X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 4 µA @ 2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-B4V3X FAQ
1.How can I place an order for BZX38450-B4V3X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B4V3X 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 BZX38450-B4V3X reliable?
The price and inventory of BZX38450-B4V3X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B4V3X is usually 5 days.
3.What payment methods are accepted for BZX38450-B4V3X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B4V3X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B4V3X?
BZX38450-B4V3X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B4V3X 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 BZX38450-B4V3X?
For technical support, including BZX38450-B4V3X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B4V3X requirements.
6.How does Aetrix verify that BZX38450-B4V3X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B4V3X 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 BZX38450-B4V3X meets industry standards.
7.What is the process for return or replacement of BZX38450-B4V3X?
All BZX38450-B4V3X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B4V3X, 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 BZX38450-B4V3X part is unused and in its original packaging.
Return procedure for BZX38450-B4V3X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B4V3X Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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MMSZ4682T1G
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MM5Z5V1ST1G
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