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Nexperia USA Inc. BZX38450-B2V4X
- Part No.:
- BZX38450-B2V4X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B2V4X.pdf
- Description:
- DIODE ZENER 2.4V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,236
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Product details
Overview
BZX38450-B2V4X 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 2.4 V regulation at 50 µA test current, with ±2 % tolerance, 200 Ω differential resistance at 5 mA, and 200 pF capacitance at 0 V - enabling stable operation in battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX38450-B2V4X datasheet, BZX38450-B2V4X pinout, BZX38450-B2V4X application, or BZX38450-B2V4X equivalent, this page provides verified electrical parameters, thermal behavior, cathode/anode terminal mapping, and real-world use cases in low-quiescent-current regulation.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 2.35 V to 2.45 V at IZ = 50 µA, exhibiting a temperature coefficient of −3.5 mV/K and typical reverse leakage ≤1.0 µA at VR = 2.0 V. Its low 50 µA test current enables accurate regulation under microampere-level bias conditions.
The device features a maximum forward voltage of 0.9 V at IF = 10 mA and total power dissipation capped at 300 mW at Tamb ≤ 25 °C on FR4 PCB. Thermal resistance from junction to ambient is 415 K/W, confirming suitability for thermally constrained surface-mount layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage (VZ) | 2.35 V to 2.45 V at IZ = 50 µA - defines precise low-current reference point for analog sensing and LDO feedback |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-production trimming in portable power rails |
| Differential Resistance (rdiff) | 600 Ω max at IZ = 50 µA - maintains regulation stability under varying load currents in low-power systems |
| Reverse Leakage (IR) | ≤1.0 µA at VR = 2.0 V - minimizes standby current drain in battery-critical applications |
| Capacitance (Cd) | 200 pF at VR = 0 V, f = 1 MHz - limits high-frequency noise coupling in signal conditioning paths |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - supports continuous operation in compact SOD323 footprint without forced cooling |
| Junction Temperature (Tj) | −55 °C to +150 °C - enables deployment in industrial and automotive-adjacent environments |
Pinout & Package
SOD323 (SC-76) plastic surface-mount 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 output node; marking bar identifies this terminal - critical for correct polarity in shunt regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path required for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables accurate voltage reference in µA-scale bias networks for IoT sensors and wearables |
| Tight voltage tolerance | ±2 % - eliminates need for external trimming in precision analog front-ends and ADC reference buffers |
| Optimized leakage profile | Controlled IR ≤1.0 µA at 2.0 V - reduces quiescent power loss in always-on monitoring circuits |
| Small-footprint packaging | SOD323 outline with 1.3 mm pitch - supports high-density PCB layouts in space-constrained portable electronics |
| Thermal robustness | Rth(j-a) = 415 K/W - allows reliable operation up to 150 °C junction temperature without heatsinking |
Applications
| Portable Sensor Biasing | Low-Power ADC Reference |
|---|---|
Use Scenario: Providing stable excitation voltage to MEMS pressure sensors in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Shunt voltage reference regulating sensor supply at 2.4 V with <1 µA standby leakage. Use Value: Extends battery life beyond 5 years by minimizing quiescent current while maintaining ±0.5 % sensor accuracy. |
Use Scenario: Generating precise 2.4 V reference for 12-bit SAR ADCs in handheld medical diagnostic devices. IC Role / Device Role / Timing Role: Low-noise Zener reference replacing higher-current bandgap ICs in signal chain front-end. Use Value: Reduces reference circuit power by 85 % versus standard 10 mA references, enabling single-CR2032 operation. |
| IoT Node Power Supervision | Wearable Charger Feedback |
Use Scenario: Monitoring Li-ion cell voltage during sleep mode in Bluetooth LE beacons using resistive divider + Zener clamp. IC Role / Device Role / Timing Role: Precision clamping element ensuring accurate undervoltage detection at 2.4 V threshold. Use Value: Achieves ±10 mV detection accuracy across −20 °C to +70 °C without calibration due to matched tempco. |
Use Scenario: Setting feedback voltage for linear charger ICs in smartwatch charging circuits where input is limited to 3.3 V. IC Role / Device Role / Timing Role: Low-current voltage setpoint generator defining charge termination threshold at 2.4 V. Use Value: Enables 100 % state-of-charge accuracy with <2 µA total feedback network current, improving charge efficiency. |
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-B2V4 | Same 2.4 V nominal, ±2 % tolerance, but rated for 500 mW Ptot and uses SOD123 package (2.7 mm × 1.7 mm). | Higher power handling suits higher-current regulation; larger footprint limits use in ultra-dense wearable PCBs. | Select when >300 mW dissipation margin is needed or legacy SOD123 layout compatibility is required. |
| MMSZ4685 | 2.4 V Zener, ±5 % tolerance, 500 mW rating, SOD123 package; rdiff = 100 Ω at 5 mA (vs. 600 Ω for BZX38450-B2V4X). | Looser tolerance and higher dynamic impedance reduce reference accuracy in precision analog circuits. | Choose only for cost-sensitive, non-critical biasing where ±5 % variation is acceptable and board space permits SOD123. |
Compared with BZX384-B2V4 and MMSZ4685, the BZX38450-B2V4X offers superior size efficiency (SOD323), tighter tolerance, and optimized low-current performance - making it the preferred choice for miniaturized, battery-limited designs requiring stable sub-µA regulation.
Availability
BZX38450-B2V4X is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC reference, and IoT node power supervision requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX38450-B2V4X 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, with leadership in advanced packaging and automotive-qualified components.
The BZX38450 series belongs to Nexperia's low-current Zener portfolio, engineered specifically for ultra-low-power voltage reference and biasing in battery-constrained applications such as wearables, wireless sensors, and energy-harvesting systems.
FAQ
What is the maximum reverse voltage before breakdown for BZX38450-B2V4X?
The BZX38450-B2V4X exhibits a nominal Zener voltage of 2.4 V with a guaranteed range of 2.35 V to 2.45 V at IZ = 50 µA. Breakdown begins within this range; operation above 2.45 V at rated current causes sustained conduction. Absolute maximum reverse voltage is not defined - the device is intended for controlled Zener operation, not transient suppression.
Can BZX38450-B2V4X be used in forward-biased applications?
Yes - its forward voltage is specified at 0.9 V maximum at IF = 10 mA, making it usable as a low-drop silicon diode in level-shifting or protection circuits. However, its primary design intent and characterization focus is reverse-bias Zener regulation; forward characteristics are secondary and not optimized for switching speed or low VF.
How does temperature affect regulation accuracy?
The BZX38450-B2V4X has a temperature coefficient of −3.5 mV/K, meaning its Zener voltage decreases by approximately 3.5 mV per degree Celsius rise. Over −20 °C to +70 °C, this introduces up to ±0.32 V drift - compensated in precision designs via resistor networks or system-level calibration, not inherent to the diode itself.
Is this part suitable for automotive applications?
No - the BZX38450-B2V4X is not automotive-qualified. Nexperia explicitly states in its legal disclaimers that non-automotive qualified products like this Zener diode are unsuitable for safety-critical or life-support systems. It lacks AEC-Q200 stress testing and automotive-grade reliability validation.
BZX38450-B2V4X 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):
- 2.4 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 1 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-B2V4X FAQ
1.How can I place an order for BZX38450-B2V4X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B2V4X 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-B2V4X reliable?
The price and inventory of BZX38450-B2V4X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B2V4X is usually 5 days.
3.What payment methods are accepted for BZX38450-B2V4X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B2V4X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B2V4X?
BZX38450-B2V4X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B2V4X 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-B2V4X?
For technical support, including BZX38450-B2V4X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B2V4X requirements.
6.How does Aetrix verify that BZX38450-B2V4X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B2V4X 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-B2V4X meets industry standards.
7.What is the process for return or replacement of BZX38450-B2V4X?
All BZX38450-B2V4X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B2V4X, 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-B2V4X part is unused and in its original packaging.
Return procedure for BZX38450-B2V4X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B2V4X Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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