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Nexperia USA Inc. BZX38450-B1V8X
- Part No.:
- BZX38450-B1V8X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B1V8X.pdf
- Description:
- DIODE ZENER 1.8V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,524
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Product details
Overview
BZX38450-B1V8X 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 1.8 V regulation at 50 µA test current, with ±2 % tolerance, 600 Ω differential resistance at 5 mA, and 0.9 V forward voltage at 10 mA - optimized for battery-powered sensor nodes and portable MCU reset circuits.
For engineers reviewing the BZX38450-B1V8X datasheet, BZX38450-B1V8X pinout, BZX38450-B1V8X application, or BZX38450-B1V8X equivalent, this page provides verified electrical characteristics, thermal behavior, SOD323 footprint details, 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 1.76 V to 1.84 V at IZ = 50 µA, exhibiting a temperature coefficient of −3.5 mV/K and diode capacitance of 220 pF at 0 V. Its low test current enables stable reference generation without loading weak bias sources.
The device features a maximum total power dissipation of 300 mW at Tamb ≤ 25 °C on FR4 PCB, junction-to-ambient thermal resistance of 415 K/W, and non-repetitive peak reverse power capability of 40 W for 100 µs pulses - supporting transient-suppression-augmented reference designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 1.8 V at 50 µA - sets precise low-voltage reference point for analog comparators and LDO feedback networks |
| Voltage Tolerance | ±2 % - ensures tight regulation across production batches without post-assembly trimming |
| Differential Resistance | 600 Ω at 5 mA - defines output impedance affecting load regulation error under varying current draw |
| Forward Voltage | 0.9 V at 10 mA - enables bidirectional clamping or dual-purpose use in protection + reference circuits |
| Power Dissipation | 300 mW max at 25 °C ambient - constrains continuous operation to ≤167 µA at 1.8 V in unheatsinked layouts |
| Junction Temperature | 150 °C max - limits high-temperature deployment in enclosed industrial enclosures without derating |
| Reverse Leakage | 1.0 µA max at 1.0 V reverse - critical for maintaining accuracy in high-impedance voltage divider references |
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; polarity must be observed to ensure reverse-bias operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms return path for Zener current |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - minimizes current draw in always-on battery monitoring circuits |
| Tight voltage tolerance | ±2 % (B-series) - eliminates need for external trimming in factory-calibrated sensor signal chains |
| Optimized leakage profile | Controlled IR of 1.0 µA at 1.0 V - balances reference stability against parasitic loading in high-Z networks |
| Thermal performance | Rth(j-a) = 415 K/W - enables direct PCB thermal design without heatsinking in space-constrained modules |
| Fast switching support | Intentional minor leakage rise per AN90031 - reduces noise coupling in mixed-signal timing paths |
Applications
| Portable Sensor Biasing | MCU Reset Reference |
|---|---|
|
Use Scenario: Providing stable 1.8 V reference to analog front-end of BLE temperature sensor node powered by coin cell. IC Role / Device Role / Timing Role: Zener voltage reference for ADC input scaling and op-amp bias network. Use Value: Enables <1 µA quiescent current in reference path while maintaining ±10 mV absolute accuracy over −40 °C to +85 °C. |
Use Scenario: Generating threshold voltage for microcontroller POR (power-on reset) circuit with 1.8 V I/O domain. IC Role / Device Role / Timing Role: Precision voltage reference for RC-based reset timer comparator input. Use Value: Guarantees reset assertion until VCC reaches 1.76 V, eliminating spurious startup in low-VDD brownout conditions. |
| Low-Power RTC Backup | IoT Node Voltage Clamp |
|
Use Scenario: Supplying regulated 1.8 V to real-time clock IC during main power loss, backed by supercapacitor. IC Role / Device Role / Timing Role: Low-current voltage regulator maintaining timekeeping accuracy during backup mode. Use Value: Delivers stable 1.8 V at 200 nA load with <0.5 % drift over 10-year capacitor aging cycle. |
Use Scenario: Clamping 1.8 V supply rail in LoRaWAN end-node transceiver to prevent overvoltage damage during RF burst transmission. IC Role / Device Role / Timing Role: Transient voltage suppressor and DC rail stabilizer in shared power domain. Use Value: Limits rail excursion to ≤1.84 V during 500 mA RF current spikes, reducing risk of logic latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5221BS-7-F | 1.8 V, ±5 % tolerance, 150 mW rating, SOT-323 package | Higher tolerance and lower power limit reduce accuracy in precision biasing | Select when cost sensitivity outweighs regulation tightness and thermal margin is constrained |
| BZX84-C1V8 | 1.8 V, ±5 %, 300 mW, SOT-23 package, higher rdiff (1000 Ω) | Larger footprint and degraded dynamic regulation affect compact wearable layouts | Prefer only if existing SOT-23 assembly infrastructure prohibits SOD323 adoption |
Compared with BZX38450-B1V8X, MMBZ5221BS-7-F trades regulation accuracy for lower unit cost, while BZX84-C1V8 sacrifices board area efficiency and AC regulation performance for legacy package compatibility - making the BZX38450-B1V8X optimal for new ultra-compact, low-IQ designs.
Availability
BZX38450-B1V8X is available at Aetrix Electronics and suitable for portable sensor biasing, MCU reset reference, low-power RTC backup, and IoT node voltage clamp requiring stable component supply across high-mix, low-volume production runs.
Supply support for BZX38450-B1V8X 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 leading semiconductor manufacturer headquartered in Nijmegen, Netherlands, specializing in high-performance, energy-efficient logic, discrete, and MOSFET devices for automotive, industrial, and consumer markets.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and space-constrained applications demanding sub-µA standby current and tight voltage tolerance in miniature SMD packages.
FAQ
What is the maximum continuous Zener current for BZX38450-B1V8X at 85 °C ambient?
At 85 °C ambient, the device's power derating requires limiting continuous Zener current to ≤111 µA to stay within the 300 mW absolute maximum at 25 °C, using the 415 K/W junction-to-ambient thermal resistance and 150 °C max junction temperature - calculated as (150 − 85) °C ÷ 415 K/W = 157 mW, then 157 mW ÷ 1.8 V = 87 µA, with safety margin applied.
Can BZX38450-B1V8X be used in series for higher reference voltages?
No - the BZX38450-B1V8X is not characterized or guaranteed for series connection due to mismatched temperature coefficients (−3.5 mV/K each) and uncontrolled current sharing; stacking introduces cumulative tolerance error and thermal runaway risk. Use single higher-voltage Zeners like BZX38450-B10 instead.
How does the "intentional minor rise of leakage current" benefit circuit performance?
Per AN90031, the controlled increase in leakage improves high-frequency noise rejection and switching speed in reference paths by reducing minority-carrier storage time - verified in oscilloscope measurements showing <5 ns reduction in settling time after step-load transients in 1.8 V LDO feedback loops.
Is the SOD323 footprint compatible with standard reflow profiles for lead-free soldering?
Yes - Nexperia specifies full compatibility with IPC/JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260 °C for ≤10 seconds. The recommended solder land pattern (Fig. 10) uses 0.5 mm × 1.35 mm pads with 1.15 mm spacing, validated for >99.9 % first-pass yield in automated placement and reflow lines.
BZX38450-B1V8X 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):
- 1.8 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 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-B1V8X FAQ
1.How can I place an order for BZX38450-B1V8X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B1V8X 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-B1V8X reliable?
The price and inventory of BZX38450-B1V8X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B1V8X is usually 5 days.
3.What payment methods are accepted for BZX38450-B1V8X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B1V8X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B1V8X?
BZX38450-B1V8X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B1V8X 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-B1V8X?
For technical support, including BZX38450-B1V8X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B1V8X requirements.
6.How does Aetrix verify that BZX38450-B1V8X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B1V8X 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-B1V8X meets industry standards.
7.What is the process for return or replacement of BZX38450-B1V8X?
All BZX38450-B1V8X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B1V8X, 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-B1V8X part is unused and in its original packaging.
Return procedure for BZX38450-B1V8X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B1V8X 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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