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Nexperia USA Inc. BZX38450-C1V8-QF
- Part No.:
- BZX38450-C1V8-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C1V8-QF.pdf
- Description:
- DIODE ZENER 1.8V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:25,658
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Product details
Overview
BZX38450-C1V8-QF 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 ±5 % tolerance, 300 mW power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-C1V8-QF datasheet, BZX38450-C1V8-QF pinout, BZX38450-C1V8-QF application, or BZX38450-C1V8-QF equivalent, key selection criteria include low-bias operation at 50 µA, cathode-anode polarity marking, thermal resistance of 415 K/W (junction-to-ambient), and optimized leakage behavior for noise-sensitive regulation in portable and automotive subsystems.
Technical Context
This device operates as a precision shunt regulator with a nominal Zener voltage of 1.8 V, specified at IZ = 50 µA - enabling stable regulation in ultra-low-power circuits where bias current must remain below 100 µA. Its differential resistance is 600 Ω at 50 µA and 100 Ω at 1 mA, supporting predictable voltage stabilization across light-load conditions.
The BZX38450-C1V8-QF features intentional minor leakage current rise per AN90031 to reduce switching noise and improve transient response, while maintaining a temperature coefficient of −3.5 mV/K and junction temperature limit of 150 °C - critical for under-hood automotive sensor supply rails and battery-backed real-time clock references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 1.71 V to 1.89 V at IZ = 50 µA - ensures tight 1.8 V regulation under minimal bias, ideal for coin-cell or energy-harvesting systems |
| Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C - supports continuous operation on standard FR4 PCB without heatsinking |
| Differential Resistance rdiff | 600 Ω at 50 µA / 100 Ω at 1 mA - defines regulation stiffness at ultra-low and light-load currents |
| Forward Voltage VF | ≤ 0.9 V at IF = 10 mA - enables use as low-drop rectifier or ESD clamp in dual-role designs |
| Thermal Resistance Rth(j-a) | 415 K/W - determines junction temperature rise under ambient conditions; requires layout-aware copper area for sustained 300 mW |
| Reverse Leakage IR | ≤ 1.0 µA at VR = 1.0 V - confirms low standby current in always-on monitoring circuits |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 |
Pinout & Package
Package: SOD323 (SC-76), surface-mounted plastic package; 2 leads; 1.3 mm pitch; 1.7 mm × 1.25 mm × 0.95 mm body; 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 - reverse-biased during regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt path for excess current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current specification | Rated at IZ = 50 µA - enables accurate regulation in micro-power systems where traditional 5 mA Zeners draw excessive current |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces high-frequency noise and improves transient suppression without sacrificing DC accuracy |
| AEC-Q101 qualification | Qualified for automotive applications - meets stress test requirements for temperature cycling, HTGB, and H3TRB |
| Tight voltage tolerance | ±5 % (C-series) - balances cost and precision for non-critical bias and reference functions in infotainment and body control modules |
| Small-footprint SOD323 | 1.7 mm × 1.25 mm footprint - saves board space in dense automotive ECUs and wearable medical sensors |
Applications
| Automotive Cabin Sensors | Portable Medical Monitors |
|---|---|
Use Scenario: Powering MEMS pressure and humidity sensors in HVAC control modules with 3.3 V rail and 1.8 V analog front-end reference. IC Role / Device Role / Timing Role: Shunt regulator providing stable 1.8 V bias to ADC reference input and sensor excitation circuitry. Use Value: Low 50 µA test current prevents loading of weak LDO outputs; AEC-Q101 rating ensures operation across −40 °C to +125 °C ambient. |
Use Scenario: Regulating reference voltage for ECG signal conditioning in battery-powered handheld monitors. IC Role / Device Role / Timing Role: Precision Zener establishing low-noise 1.8 V reference for instrumentation amplifier gain-setting network. Use Value: Optimized leakage behavior minimizes broadband noise coupling into µV-level biopotential signals. |
| Smart Meter Real-Time Clock | Industrial IoT Edge Node |
Use Scenario: Maintaining RTC backup voltage during main power loss using coin-cell battery and low-quiescent LDO. IC Role / Device Role / Timing Role: Low-current Zener clamping LDO output to 1.8 V to prevent overvoltage damage to RTC IC during brownout transitions. Use Value: 1.0 µA max reverse leakage at 1.0 V preserves battery life over multi-year deployments. |
Use Scenario: Providing stable bias to RF transceiver crystal oscillator circuitry in LoRaWAN gateways deployed outdoors. IC Role / Device Role / Timing Role: Voltage reference stabilizing oscillator core supply, reducing phase noise induced by supply ripple. Use Value: −3.5 mV/K tempco and 100 Ω dynamic impedance ensure frequency stability within ±50 ppm over −40 °C to +85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX38450-B1V8-Q | ±2 % tolerance (vs. ±5 %); lower rdiff = 600 Ω @ 50 µA but same 100 Ω @ 1 mA | Preferred where tighter initial voltage accuracy is required, e.g., calibration references | Select B-series when absolute VZ accuracy outweighs cost sensitivity; C-series offers better price/performance for general biasing |
| MMSZ4678T1G | 1.8 V, ±5 %, SOD-123 package, 500 mW rating, higher rdiff (1000 Ω @ 50 µA), no AEC-Q101 qualification | Suitable for industrial/commercial only; larger footprint and higher thermal resistance (500 K/W) | Choose only if SOD-123 footprint is already standardized and automotive qualification is not required |
Compared with BZX38450-B1V8-Q, the C1V8-QF trades ±2 % accuracy for lower cost and identical noise-optimized leakage; versus MMSZ4678T1G, it delivers AEC-Q101 compliance, smaller SOD323 footprint, and superior thermal performance - making it the preferred choice for next-generation automotive and portable electronics.
Availability
BZX38450-C1V8-QF is available at Aetrix Electronics and suitable for automotive cabin sensors, portable medical monitors, smart meter RTC backup, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term sourcing.
Supply support for BZX38450-C1V8-QF 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 consumer markets.
The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, designed specifically for low-current, low-noise voltage regulation in space-constrained automotive and portable electronics applications.
FAQ
What is the maximum reverse voltage the BZX38450-C1V8-QF can withstand before breakdown?
The device is rated for nominal Zener voltage of 1.8 V at 50 µA, with guaranteed breakdown between 1.71 V and 1.89 V. Absolute maximum reverse voltage is not defined independently - operation beyond VZ + margin risks exceeding Ptot = 300 mW or junction temperature limits. Non-repetitive peak reverse power is 40 W for 100 µs pulses.
Can BZX38450-C1V8-QF be used in forward conduction mode?
Yes - its forward voltage is specified ≤ 0.9 V at 10 mA, making it usable as a low-VF clamp or protection diode. However, it is optimized for reverse-biased Zener operation; forward characteristics are secondary and not characterized for high-current or switching applications.
How does the "C" suffix differ from "B" in the BZX38450-Q series?
The "C" suffix denotes ±5 % tolerance and intentional minor leakage current rise (per AN90031) for improved noise reduction and fast switching. The "B" suffix indicates ±2 % tolerance and standard leakage behavior - both share identical package, power rating, and AEC-Q101 qualification.
Is thermal derating required above 25 °C ambient?
Yes - total power dissipation must be linearly derated above 25 °C using Rth(j-a) = 415 K/W. For example, at 85 °C ambient, maximum allowable Ptot drops to approximately 175 mW to maintain Tj ≤ 150 °C, assuming standard FR4 PCB mounting per datasheet condition [2].
BZX38450-C1V8-QF 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:
- ±5%
- 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:
- -55°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-C1V8-QF FAQ
1.How can I place an order for BZX38450-C1V8-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C1V8-QF 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-C1V8-QF reliable?
The price and inventory of BZX38450-C1V8-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C1V8-QF is usually 5 days.
3.What payment methods are accepted for BZX38450-C1V8-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C1V8-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C1V8-QF?
BZX38450-C1V8-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C1V8-QF 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-C1V8-QF?
For technical support, including BZX38450-C1V8-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C1V8-QF requirements.
6.How does Aetrix verify that BZX38450-C1V8-QF is sourced from the original manufacturer or authorized distributors?
All BZX38450-C1V8-QF 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-C1V8-QF meets industry standards.
7.What is the process for return or replacement of BZX38450-C1V8-QF?
All BZX38450-C1V8-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C1V8-QF, 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-C1V8-QF part is unused and in its original packaging.
Return procedure for BZX38450-C1V8-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C1V8-QF Tags
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