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Nexperia USA Inc. BZX38450-B3V3X
- Part No.:
- BZX38450-B3V3X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B3V3X.pdf
- Description:
- DIODE ZENER 3.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,978
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Product details
Overview
BZX38450-B3V3X 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 3.3 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW power dissipation, and 160 Ω differential resistance at 5 mA - ideal for battery-powered sensor nodes and portable MCU reset circuits.
For engineers reviewing the BZX38450-B3V3X datasheet, BZX38450-B3V3X pinout, BZX38450-B3V3X application, or BZX38450-B3V3X equivalent, key selection criteria include low-test-current regulation stability, thermal resistance (Rth(j-a) = 415 K/W), cathode-anode polarity marking, and compatibility with FR4 PCB layouts using standard SOD323 footprints.
Technical Context
This Zener diode operates in reverse breakdown mode with specified regulation at IZ = 50 µA - enabling stable reference generation under micro-power conditions where conventional regulators draw excessive quiescent current. Its 3.3 V nominal voltage exhibits a temperature coefficient of −3.5 mV/K and reverse leakage ≤0.8 µA at VR = 3.0 V.
The device uses planar epitaxial construction for tight parameter control across the B-series (±2 % tolerance), features intentional low-leakage design (unlike C-series variants optimized for fast switching), and maintains 160 Ω dynamic impedance at 5 mA to ensure minimal output voltage drift under load variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.3 V at IZ = 50 µA - defines precise reference point for low-bias analog circuits |
| Tolerance | ±2 % - ensures voltage accuracy without post-production trimming in cost-sensitive designs |
| Differential Resistance | 160 Ω at IZ = 5 mA - limits output voltage shift to <0.8 V per 5 mA load change |
| Forward Voltage | ≤0.9 V at IF = 10 mA - enables use as clamping diode in bidirectional protection schemes |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous power handling in standard layout |
| Junction Temperature Limit | 150 °C - constrains thermal derating above ambient, critical for sealed enclosure deployments |
| Thermal Resistance (j-a) | 415 K/W - indicates ~130 °C rise at full 300 mW on unmodified FR4, guiding heatsinking decisions |
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) | Connected to ground or lower-potential rail; reverse-biased operation requires anode at lower potential than cathode |
Key Features
| Feature | Design Value |
|---|---|
| Low test current regulation | Specified at 50 µA - enables stable reference in nanoamp-level standby modes of IoT sensors |
| Tight voltage tolerance | ±2 % (B-series) - eliminates need for external trimming in 3.3 V supply monitoring circuits |
| Controlled temperature coefficient | −3.5 mV/K - predictable drift allows compensation in precision ADC reference paths |
| Low leakage current | ≤0.8 µA at 3.0 V reverse bias - minimizes parasitic discharge in battery-backed real-time clocks |
| Standardized SOD323 footprint | Compatible with IPC-7351B SC-76 land pattern - supports automated placement and reflow without custom stencil design |
Applications
| Microcontroller Reset Circuit | Portable Sensor Biasing |
|---|---|
|
Use Scenario: Providing clean, low-drift reset threshold for ARM Cortex-M0+ MCUs in wearable health monitors. IC Role / Device Role / Timing Role: Zener diode establishes 3.3 V reference for external reset supervisor IC (e.g., MAX809). Use Value: ±2 % tolerance ensures reset assertion within 3.23–3.37 V, preventing spurious resets during battery voltage sag. |
Use Scenario: Supplying stable bias voltage to MEMS accelerometer analog front-end in Bluetooth LE beacons. IC Role / Device Role / Timing Role: Functions as shunt regulator for op-amp input stage requiring sub-1 µA quiescent current. Use Value: 50 µA test current matches typical sensor bias requirements, eliminating need for series resistor recalibration. |
| USB-C PD Voltage Clamp | Low-Power ADC Reference |
|
Use Scenario: Clamping VBUS monitor node in USB-C power delivery negotiation circuits with 3.3 V logic interfaces. IC Role / Device Role / Timing Role: Reverse-connected Zener limits sensed voltage to safe 3.3 V level before ADC input. Use Value: 0.9 V forward drop protects against accidental forward conduction during hot-plug transients. |
Use Scenario: Generating precision reference for 12-bit SAR ADC in energy-harvesting wireless sensor nodes. IC Role / Device Role / Timing Role: Provides stable 3.3 V reference independent of main supply rail fluctuations. Use Value: 160 Ω dynamic impedance ensures <0.1 LSB error contribution across 0–1 mA reference sink variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5226BT1G | 3.3 V ±5 %, 500 mW rating, SOD-123 package (larger footprint) | Higher power margin but looser tolerance; less suitable for precision reset thresholds | Select when board space allows larger package and ±5 % regulation accuracy is acceptable |
| BZX84-C3V3 | 3.3 V ±5 %, 300 mW, SOT-23 package (3-pin, anode/cathode/anode configuration) | Requires PCB redesign due to different pinout and polarity marking; higher leakage (~5 µA) | Choose only if legacy SOT-23 footprint reuse is mandatory and leakage sensitivity is low |
Compared with MMSZ5226BT1G and BZX84-C3V3, the BZX38450-B3V3X offers tighter ±2 % tolerance and lower leakage in a smaller SOD323 footprint - making it optimal for space-constrained, high-accuracy micro-power regulation where thermal resistance and layout compatibility are critical.
Availability
BZX38450-B3V3X is available at Aetrix Electronics and suitable for portable medical devices, battery-powered sensor networks, and industrial IoT gateways requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX38450-B3V3X 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-qualified and industrial-grade components.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for voltage reference and biasing in energy-efficient portable electronics where minimal quiescent current and tight regulation tolerance are essential.
FAQ
What is the maximum reverse voltage the BZX38450-B3V3X can withstand before breakdown?
The BZX38450-B3V3X has a nominal Zener voltage of 3.3 V at 50 µA, with a guaranteed working range of 3.23 V to 3.37 V (±2 %). It begins controlled reverse breakdown near 3.23 V and maintains regulation up to its absolute maximum reverse power limit of 40 W in non-repetitive 100 µs pulses - but continuous operation must stay within 300 mW total dissipation.
How does the BZX38450-B3V3X differ from the C-series variant (e.g., BZX38450-C3V3)?
The BZX38450-B3V3X uses tighter ±2 % voltage tolerance and lower leakage current (≤0.8 µA at 3.0 V), while the C-series (e.g., BZX38450-C3V3) offers approximately ±5 % tolerance and intentionally higher leakage for improved noise suppression and faster switching in transient-sensitive applications - making the B-series preferred for precision reference use.
Can the BZX38450-B3V3X be used in forward-bias applications?
Yes - it functions as a standard silicon diode in forward bias, with VF ≤ 0.9 V at 10 mA. This allows dual-use in circuits requiring both reverse-bias regulation and forward-bias clamping or protection, though its primary design intent and characterization are for Zener-mode operation at 50 µA test current.
What PCB layout considerations are critical for thermal performance?
Mount the BZX38450-B3V3X on an FR4 board with standard SOD323 footprint per Nexperia's Fig. 10 (reflow) or Fig. 11 (wave soldering), using tin-plated copper. Avoid thermal relief on cathode pad to minimize Rth(j-a); adding 10 mm² of 1 oz copper connected to cathode reduces junction-to-ambient resistance significantly below the rated 415 K/W.
BZX38450-B3V3X 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):
- 3.3 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1.5 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-B3V3X FAQ
1.How can I place an order for BZX38450-B3V3X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B3V3X 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-B3V3X reliable?
The price and inventory of BZX38450-B3V3X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B3V3X is usually 5 days.
3.What payment methods are accepted for BZX38450-B3V3X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B3V3X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B3V3X?
BZX38450-B3V3X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B3V3X 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-B3V3X?
For technical support, including BZX38450-B3V3X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B3V3X requirements.
6.How does Aetrix verify that BZX38450-B3V3X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B3V3X 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-B3V3X meets industry standards.
7.What is the process for return or replacement of BZX38450-B3V3X?
All BZX38450-B3V3X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B3V3X, 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-B3V3X part is unused and in its original packaging.
Return procedure for BZX38450-B3V3X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B3V3X Tags
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MM5Z5V1ST1G
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