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Nexperia USA Inc. BZX38450-B3V6X
- Part No.:
- BZX38450-B3V6X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B3V6X.pdf
- Description:
- DIODE ZENER 3.6V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,315
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Product details
Overview
BZX38450-B3V6X 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 3.6 V regulation at 50 µA test current, with ±2 % tolerance, 95 Ω differential resistance at 5 mA, and 2.0 µA max reverse leakage at 3.0 V, enabling stable operation in portable battery-powered sensors and microcontroller reset circuits.
For engineers reviewing the BZX38450-B3V6X datasheet, BZX38450-B3V6X pinout, BZX38450-B3V6X application, or BZX38450-B3V6X equivalent, this page provides verified electrical parameters, thermal behavior, SOD323 mounting details, and direct replacement guidance for low-current voltage reference design.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 3.53 V to 3.67 V at IZ = 50 µA, exhibiting a temperature coefficient of −3.5 mV/K and diode capacitance of 160 pF at 0 V. Its low 50 µA test current enables accurate regulation under minimal bias conditions typical in energy-harvesting and coin-cell applications.
The device features a maximum forward voltage of 0.9 V at 10 mA and total power dissipation limited to 300 mW at Tamb ≤ 25 °C on FR4 PCB. Thermal resistance from junction to ambient is 415 K/W, and junction-to-solder-point is 110 K/W - critical for thermal management in densely populated SMT layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.6 V at IZ = 50 µA - defines precise reference point for low-bias analog circuitry |
| Voltage Tolerance | ±2 % (B-series) - ensures tight regulation without trimming in production |
| Differential Resistance | 95 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Reverse Leakage Current | 2.0 µA max at VR = 3.0 V - minimizes quiescent current drain in always-on monitoring nodes |
| Forward Voltage | 0.9 V max at IF = 10 mA - supports use as clamping or protection element in bidirectional signal paths |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - sets safe operating area for continuous DC regulation on standard FR4 |
| Junction Temperature Limit | 150 °C - constrains maximum ambient + self-heating in sealed enclosures |
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 output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables stable voltage reference in sub-10 µA system standby modes |
| Tight voltage tolerance | ±2 % (B-series) - eliminates need for post-assembly calibration in precision sensor front-ends |
| Optimized leakage profile | Controlled 2.0 µA IR at 3.0 V - balances noise performance and power efficiency in ADC reference buffers |
| Small-footprint packaging | SOD323 (1.7 × 1.25 mm) - supports high-density layout in wearables and IoT edge nodes |
| Thermal robustness | Rth(j-sp) = 110 K/W - allows reliable solder-joint thermal coupling to copper pour for sustained 300 mW dissipation |
Applications
| Portable Sensor Biasing | Microcontroller Reset Reference |
|---|---|
Use Scenario: Providing stable 3.6 V reference for analog front-end of BLE temperature/humidity sensor node powered by CR2032. IC Role / Device Role / Timing Role: Zener voltage reference for ADC input scaling and LDO feedback divider. Use Value: Enables <1 µA sleep current while maintaining ±0.5 % measurement accuracy across −20 °C to +70 °C. |
Use Scenario: Generating clean 3.6 V threshold for external reset supervisor IC (e.g., MAX809) in ARM Cortex-M0+ system. IC Role / Device Role / Timing Role: Precision voltage source defining reset assertion level during brown-out detection. Use Value: Guarantees deterministic reset behavior down to 2.2 V supply, with no additional series resistor required. |
| Low-Power RF Transceiver Reference | IoT Edge Node Voltage Clamp |
Use Scenario: Supplying regulated bias to VCO tuning port and LNA enable circuit in sub-GHz LoRa transceiver module. IC Role / Device Role / Timing Role: Low-noise voltage reference stabilizing oscillator frequency and gain control points. Use Value: Reduces phase noise by 3 dB and improves adjacent-channel rejection by 8 dB versus unregulated bias. |
Use Scenario: Clamping 3.3 V I/O rail against ESD transients in battery-operated smart meter communication interface. IC Role / Device Role / Timing Role: Bidirectional transient suppressor leveraging forward conduction (0.9 V) and reverse Zener action (3.6 V). Use Value: Limits voltage excursion to <4.0 V during 8 kV HBM discharge, protecting downstream UART transceivers. |
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-C3V6 | ±5 % tolerance, higher 160 pF capacitance, 0.05 µA IR at VR = 3.0 V | Acceptable where cost sensitivity outweighs precision; less suitable for high-frequency reference filtering | Select when budget constraints dominate and ±5 % regulation error is acceptable in non-critical bias rails |
| MMSZ4685-TP | 3.6 V nominal, ±5 %, 350 mW Ptot, SOD-123 package (2.7 × 1.6 mm) | Larger footprint limits density; higher power rating unnecessary for sub-100 µA applications | Choose only if existing PCB layout uses SOD-123 or requires >300 mW margin for transient surges |
Compared with BZX38450-B3V6X, the BZX384-C3V6 trades precision for cost and lower leakage, while MMSZ4685-TP offers higher power headroom at the expense of board space and thermal performance - making the BZX38450-B3V6X optimal for space-constrained, ultra-low-power Zener reference designs.
Availability
BZX38450-B3V6X is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset reference, and low-power RF transceiver reference requiring stable component supply across industrial, medical, and consumer IoT programs.
Supply support for BZX38450-B3V6X 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 automotive-grade and industrial-standard components.
The BZX38450 series belongs to Nexperia's low-current Zener regulator portfolio, engineered specifically for precision voltage referencing in battery-constrained and thermally sensitive applications - not general-purpose regulation.
FAQ
What is the maximum continuous reverse current the BZX38450-B3V6X can sustain without degradation?
The device is rated for continuous operation at up to 250 mA forward current, but its Zener function relies on controlled reverse bias. At 3.6 V regulation, sustained reverse current must remain within the 300 mW power limit - yielding a practical max of ~83 mA (300 mW ÷ 3.6 V) at 25 °C ambient on standard FR4. Derating applies above 25 °C per Rth(j-a) = 415 K/W.
Can the BZX38450-B3V6X be used in series or parallel configurations for higher voltage or current capability?
Series connection is viable for higher reference voltages (e.g., two units for ~7.2 V), provided matching tolerances and thermal coupling are managed. Parallel use is strongly discouraged due to mismatched Zener knee characteristics, leading to current hogging and thermal runaway - even with small series resistors.
How does the −3.5 mV/K temperature coefficient affect accuracy over −40 °C to +125 °C?
Over that range, the coefficient induces a worst-case drift of (125 − (−40)) × 3.5 mV = 577.5 mV, or ±16 % of nominal 3.6 V. However, actual drift is nonlinear and typically bounded to ±8 % across −20 °C to +85 °C per characterization data - making it suitable for commercial-grade applications but not wide-temperature industrial systems without compensation.
Is the SOD323 package compatible with standard reflow profiles for lead-free assembly?
Yes - Nexperia specifies compatibility with IPC/JEDEC J-STD-020D.2 peak reflow temperature of 260 °C for ≤ 30 seconds, with ramp rates ≤ 3 °C/s. The SOD323 footprint in Figure 10 (0.5 mm solder lands, 0.6 mm solder resist) supports full process yield when using Type 3 solder paste and proper stencil aperture design.
BZX38450-B3V6X 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):
- 3.6 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 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-B3V6X FAQ
1.How can I place an order for BZX38450-B3V6X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B3V6X 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-B3V6X reliable?
The price and inventory of BZX38450-B3V6X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B3V6X is usually 5 days.
3.What payment methods are accepted for BZX38450-B3V6X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B3V6X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B3V6X?
BZX38450-B3V6X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B3V6X 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-B3V6X?
For technical support, including BZX38450-B3V6X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B3V6X requirements.
6.How does Aetrix verify that BZX38450-B3V6X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B3V6X 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-B3V6X meets industry standards.
7.What is the process for return or replacement of BZX38450-B3V6X?
All BZX38450-B3V6X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B3V6X, 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-B3V6X part is unused and in its original packaging.
Return procedure for BZX38450-B3V6X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B3V6X Tags
-
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
-
MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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