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Nexperia USA Inc. BZX38450-B1V8-QX
- Part No.:
- BZX38450-B1V8-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B1V8-QX.pdf
- Description:
- DIODE ZENER 1.8V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,099
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Product details
Overview
BZX38450-B1V8-Q from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 1.8 V nominal regulation at 50 µA test current, with ±2 % tolerance, 300 mW power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-B1V8-Q datasheet, BZX38450-B1V8-Q pinout, BZX38450-B1V8-Q application, or BZX38450-B1V8-Q equivalent, this device serves as a precision low-bias voltage reference in battery-powered sensor nodes, automotive body control modules, and portable instrumentation where stable 1.8 V regulation under microampere bias is required.
Technical Context
This Zener diode operates in reverse breakdown 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 differential resistance ≤600 Ω at 5 mA. Its low leakage (≤1.0 µA at VR = 1.0 V) and 220 pF capacitance support noise-sensitive analog front-ends.
Designed for low-power biasing, it delivers stable regulation down to 50 µA test current-enabling operation in ultra-low-quiescent circuits-and features intentional cathode marking (bar) and AEC-Q101 qualification for under-hood automotive environments up to +150 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 1.8 V at IZ = 50 µA - precise low-voltage reference for 1.8 V logic rails and ADC references |
| Voltage Tolerance | ±2 % (B-series) - tight regulation enables accurate voltage clamping without post-calibration |
| Forward Voltage | ≤0.9 V at IF = 10 mA - low conduction loss when used in bidirectional protection or clamp configurations |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C - sufficient headroom for transient overvoltage suppression in compact PCB layouts |
| Junction Temperature | −55 °C to +150 °C - supports operation in automotive engine compartments and industrial edge sensors |
| Reverse Leakage | ≤1.0 µA at VR = 1.0 V - minimal standby current draw critical for coin-cell–powered IoT endpoints |
| Thermal Resistance | 415 K/W (junction-to-ambient) - defines derating curve for sustained operation on FR4 PCBs without heatsinking |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package: 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, single-sided copper FR4 mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marked by bar on package top - polarity-critical for correct Zener biasing |
| 2 | Anode (A) | Connected to ground or lower-potential rail - completes reverse-bias path enabling voltage regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables regulation in µA-level bias networks common in battery-backed RTCs and wake-up circuits |
| AEC-Q101 qualification | Qualified per stress test standard for discrete semiconductors - validated for automotive body electronics and infotainment power rails |
| Tight voltage tolerance | ±2 % (B-series) - reduces need for external trimming in 1.8 V supply monitoring and brown-out detection |
| Optimized leakage profile | Controlled IR ≤1.0 µA at 1.0 V - balances low standby power against fast turn-on for transient suppression |
| Small footprint | SOD323 package - saves board space in high-density automotive ECUs and wearable medical sensors |
Applications
| Automotive Body Control Unit (BCU) | Portable Medical Sensor Node |
|---|---|
Use Scenario: Regulating 1.8 V supply for LIN transceiver bias and EEPROM interface logic in door module ECUs. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 1.8 V rail independent of main 12 V battery fluctuations. Use Value: Maintains I/O compatibility during cold-crank (6.5 V battery dip) and load-dump transients due to AEC-Q101 robustness and 150 °C junction rating. |
Use Scenario: Biasing low-power op-amps and ADC references in disposable glucose monitors powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Precision shunt regulator establishing accurate 1.8 V reference for 12-bit analog signal conditioning. Use Value: Draws only 50 µA test current and ≤1 µA leakage, extending battery life beyond 12 months while holding ±2 % voltage accuracy. |
| Industrial PLC Input Module | Smart Home Motion Detector |
Use Scenario: Clamping and level-shifting 0–10 V analog sensor inputs to 1.8 V microcontroller ADC range in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as precision clamp and reference source for input scaling resistors. Use Value: 600 Ω max differential resistance ensures minimal loading error across 0–10 V span; 220 pF capacitance avoids signal distortion at 1 kHz bandwidth. |
Use Scenario: Providing stable 1.8 V bias to PIR sensor amplifier and ultra-low-power BLE SoC in battery-operated occupancy sensors. IC Role / Device Role / Timing Role: Low-current voltage reference enabling always-on sensing with <10 µA average system current. Use Value: SOD323 footprint allows integration into 12 mm × 12 mm PCBs; −3.5 mV/K tempco minimizes drift across −20 °C to +60 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C1V8-Q | ±5 % tolerance (C-series), higher leakage (≤1.0 µA at VR = 1.0 V same), identical package and thermal specs | Acceptable where 1.71–1.89 V range suffices, e.g., non-critical power-good detection | Select for cost-sensitive consumer designs where ±2 % is unnecessary |
| MMSZ4678T1G | 1.8 V, ±5 %, 500 mW Ptot, SOD-123 package (larger: 2.7 mm × 1.6 mm), no AEC-Q101 qualification | Higher power margin but unsuitable for automotive under-hood use due to qualification gap | Choose only for industrial or commercial applications requiring >300 mW headroom |
Compared with BZX38450-B1V8-Q, the C1V8-Q offers relaxed tolerance at equal size and qualification, while MMSZ4678T1G trades automotive reliability for higher power and larger footprint-making the B-series the sole option for AEC-Q101–compliant 1.8 V micro-regulation.
Availability
BZX38450-B1V8-Q is available at Aetrix Electronics and suitable for automotive body electronics, portable medical sensors, industrial PLC analog input stages, and smart home motion detectors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX38450-B1V8-Q 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and mobile markets.
BZX38450-Q series belongs to Nexperia's AEC-Q101–qualified Zener diode portfolio, engineered specifically for low-current, high-stability voltage regulation in space-constrained automotive and portable electronics.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX38450-B1V8-Q has a nominal Zener voltage of 1.8 V, with guaranteed breakdown between 1.76 V and 1.84 V at 50 µA. Its absolute maximum non-repetitive peak reverse voltage is not specified separately; instead, it is limited by the 40 W non-repetitive surge rating at 100 µs pulse width and the 300 mW continuous power dissipation limit.
Does this Zener diode require a series resistor in all applications?
Yes - a current-limiting resistor is mandatory to set the operating current within the 50 µA to 5 mA range specified in the datasheet. Without it, excessive current could exceed the 300 mW power limit or damage the junction. The resistor value is calculated using (VIN − 1.8 V)/IZ, where IZ is selected based on desired regulation stability and leakage trade-offs.
How does the −3.5 mV/K temperature coefficient affect performance in automotive environments?
The negative temperature coefficient means output voltage decreases by 3.5 mV per degree Celsius rise. Over a −40 °C to +125 °C automotive junction range, this yields ~577 mV total drift - mitigated by design margins in 1.8 V systems and compensated in precision references via complementary components. It is typical for low-voltage Zeners below 2.4 V.
Can this diode be used in forward-bias mode like a standard silicon diode?
Yes - its forward voltage is ≤0.9 V at 10 mA, matching standard silicon diodes. However, it is not optimized for forward conduction: the 250 mA absolute maximum forward current is secondary to its Zener function, and forward characteristics are only characterized at 10 mA. Use only for low-duty-cycle clamping or indicator paths, not power rectification.
BZX38450-B1V8-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450-Q
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-B1V8-QX FAQ
1.How can I place an order for BZX38450-B1V8-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B1V8-QX 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-B1V8-QX reliable?
The price and inventory of BZX38450-B1V8-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B1V8-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B1V8-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B1V8-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B1V8-QX?
BZX38450-B1V8-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B1V8-QX 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-B1V8-QX?
For technical support, including BZX38450-B1V8-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B1V8-QX requirements.
6.How does Aetrix verify that BZX38450-B1V8-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B1V8-QX 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-B1V8-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B1V8-QX?
All BZX38450-B1V8-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B1V8-QX, 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-B1V8-QX part is unused and in its original packaging.
Return procedure for BZX38450-B1V8-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B1V8-QX 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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Diodes Incorporated
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onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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BZT52C15S-7-F
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