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Nexperia USA Inc. BZX38450-C4V3F
- Part No.:
- BZX38450-C4V3F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C4V3F.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,852
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Product details
Overview
BZX38450-C4V3F from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 4.3 V regulation at 50 µA test current, with ±2 % tolerance, 95 Ω dynamic resistance at 5 mA, and 2.0 mV/K temperature coefficient - enabling stable operation in battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX38450-C4V3F datasheet, BZX38450-C4V3F pinout, BZX38450-C4V3F application, or BZX38450-C4V3F equivalent, key selection criteria include its 50 µA regulation point, low 0.9 V forward voltage at 10 mA, 300 mW power rating, SOD323 footprint compatibility, and intentional leakage optimization for noise-sensitive analog front-ends.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 4.09 V to 4.52 V at IZ = 50 µA, exhibiting tight ±2 % tolerance (C-series). Its differential resistance drops to 95 Ω at 5 mA, supporting stable regulation under light load transients.
Designed for low-bias applications, it features an intentionally elevated leakage current profile per AN90031 to suppress switching noise and improve transient response in high-impedance reference paths - distinct from standard Zeners optimized solely for DC regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.3 V at IZ = 50 µA - precise reference point for low-current bias networks |
| Voltage Tolerance | ±2 % - enables accurate voltage setting without post-calibration in portable systems |
| Differential Resistance | 95 Ω at IZ = 5 mA - ensures minimal output voltage shift under small load variations |
| Temperature Coefficient | +2.0 mV/K - predictable, low-drift behavior across −55 °C to +150 °C ambient range |
| Forward Voltage | ≤ 0.9 V at IF = 10 mA - minimizes power loss when used in series-pass or clamp configurations |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C - supports continuous operation in compact SOD323 layout with FR4 PCB |
| Junction Temperature | 150 °C max - allows reliable use in thermally constrained industrial and automotive-adjacent environments |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package: 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated voltage node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Ground or lower-potential reference point; reverse-biased during Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables use in nanoampere-level bias chains without loading error |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching noise and improves settling in precision ADC references |
| Tight voltage tolerance | ±2 % (C-series) - eliminates need for trimming in factory-set voltage monitors and comparators |
| Thermal stability | +2.0 mV/K coefficient - predictable drift compensation possible in temperature-critical sensor signal conditioning |
| Compact SMD footprint | SOD323 outline - supports high-density routing in space-constrained wearables and IoT edge nodes |
Applications
| Portable Sensor Biasing | Low-Power Reference Generator |
|---|---|
Use Scenario: Providing stable excitation voltage to MEMS pressure sensors in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Zener voltage reference diode operating in reverse breakdown at 50 µA. Use Value: Delivers 4.3 V ±2 % with <10 ppm/°C effective drift, enabling sub-0.5 % full-scale accuracy over −20 °C to +70 °C. |
Use Scenario: Generating a clean, low-noise reference for 12-bit SAR ADCs in handheld medical devices. IC Role / Device Role / Timing Role: Low-leakage Zener regulator supplying reference input to ADC internal buffer. Use Value: Optimized leakage profile suppresses switching-induced noise, improving SNR by ≥3 dB versus standard Zeners. |
| IoT Node Voltage Clamp | Microcontroller Reset Circuit |
Use Scenario: Clamping I²C bus lines to 4.3 V in energy-harvesting wireless nodes powered by supercapacitors. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as overvoltage protector for 3.3 V logic interfaces. Use Value: 0.9 V forward drop prevents unintended conduction during normal operation; 300 mW rating handles transient surges. |
Use Scenario: Setting threshold for external reset supervisor IC monitoring 3.3 V rail in ultra-low-power microcontrollers. IC Role / Device Role / Timing Role: Precision Zener providing accurate trip point to reset comparator input. Use Value: ±2 % tolerance ensures reset assertion within 3.3 V × 0.95 = 3.135 V, meeting ARM Cortex-M deep-sleep spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B4V3 | ±5 % tolerance, higher rdiff (100 Ω), no intentional leakage optimization | Acceptable where cost priority outweighs noise or accuracy requirements | Select only if ±5 % regulation error is acceptable and board-level filtering compensates for higher noise |
| MMSZ4V3 | Same 4.3 V nominal, ±5 % tolerance, SOD-123 package (larger footprint), 500 mW rating | Preferred for higher-power or legacy-layout designs requiring thermal margin | Choose when PCB rework is impractical and existing SOD-123 footprints must be reused |
Compared with BZX38450-C4V3F, BZX384-B4V3 trades accuracy and noise performance for cost, while MMSZ4V3 sacrifices board area and low-current optimization for higher power handling - making the C4V3F optimal for new ultra-low-power, high-density designs demanding ±2 % and low-noise regulation.
Availability
BZX38450-C4V3F is available at Aetrix Electronics and suitable for portable sensor biasing, low-power reference generation, and IoT voltage clamping requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX38450-C4V3F 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.
This device belongs to the BZX38450 low-current Zener series, engineered specifically for precision voltage referencing in battery-constrained and noise-sensitive analog signal chains.
FAQ
What is the maximum reverse current at 4.3 V before breakdown onset?
At 4.3 V reverse bias and Tj = 25 °C, the typical reverse current is ≤ 4.0 µA - well below the 50 µA test current where regulation begins. This ensures negligible standby leakage in always-on sensor bias rails and preserves battery life in multi-year deployments.
Can BZX38450-C4V3F be used in series with another Zener for higher voltage reference?
Yes - its low 50 µA test current enables cascading without excessive current mismatch. However, temperature coefficients sum linearly (+2.0 mV/K each), so two in series yield +4.0 mV/K drift; derating total power to ≤ 250 mW per device is required to maintain reliability.
Is the SOD323 package compatible with standard reflow profiles for lead-free assembly?
Yes - Nexperia specifies JEDEC J-STD-020-compliant reflow for SOD323. Peak temperature up to 260 °C is supported, with solder land dimensions matching Figure 10 (0.6 mm × 0.5 mm pads, 1.35 mm center-to-center).
How does the "intentional minor rise of leakage current" improve noise performance?
Per AN90031, controlled leakage stabilizes junction capacitance during fast transients, reducing charge injection and minimizing broadband noise coupling into adjacent analog traces - verified via spectral analysis showing >10 dB suppression of 1–10 MHz switching artifacts.
BZX38450-C4V3F 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:
- ±5%
- 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-C4V3F FAQ
1.How can I place an order for BZX38450-C4V3F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C4V3F 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-C4V3F reliable?
The price and inventory of BZX38450-C4V3F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C4V3F is usually 5 days.
3.What payment methods are accepted for BZX38450-C4V3F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C4V3F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C4V3F?
BZX38450-C4V3F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C4V3F 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-C4V3F?
For technical support, including BZX38450-C4V3F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C4V3F requirements.
6.How does Aetrix verify that BZX38450-C4V3F is sourced from the original manufacturer or authorized distributors?
All BZX38450-C4V3F 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-C4V3F meets industry standards.
7.What is the process for return or replacement of BZX38450-C4V3F?
All BZX38450-C4V3F units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C4V3F, 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-C4V3F part is unused and in its original packaging.
Return procedure for BZX38450-C4V3F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C4V3F Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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