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Nexperia USA Inc. BZX38450-C43-QF
- Part No.:
- BZX38450-C43-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C43-QF.pdf
- Description:
- DIODE ZENER 43V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,747
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Product details
Overview
BZX38450-C43-QF from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 43 V nominal working voltage at 50 µA test current, with ±5 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-C43-QF datasheet, BZX38450-C43-QF pinout, BZX38450-C43-QF application, or BZX38450-C43-QF equivalent, key selection criteria include low-bias operation at 50 µA, thermal resistance of 415 K/W (junction-to-ambient), cathode-anode polarity marking, and differential resistance of 375 Ω at IZ = 2 mA.
Technical Context
This device operates as a precision shunt voltage reference in reverse-biased mode, with specified regulation at IZ = 2 mA for the C-series (±5 % tolerance), and exhibits a temperature coefficient of +0.05 mV/K at 43 V. Its low 50 µA test current enables stable regulation in ultra-low-power circuits.
The diode features intentional leakage optimization per AN90031 for fast switching and noise reduction, and achieves 40 W non-repetitive peak reverse power dissipation under 100 µs surge conditions - critical for transient suppression in automotive ECUs and sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 43 V at IZ = 2 mA; defines regulated output voltage in shunt configuration |
| Tolerance | ±5 % (C-series); allows predictable voltage margin for safety-critical biasing |
| Test Current | 50 µA; enables stable regulation in battery-powered micro-power systems |
| Differential Resistance | 375 Ω at IZ = 2 mA; determines load regulation error under varying current draw |
| Forward Voltage | 0.9 V at IF = 10 mA; defines conduction threshold in forward-biased protection paths |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 PCB; sets maximum continuous DC power handling |
| Junction Temperature | 150 °C max; supports operation in under-hood automotive environments |
Pinout & Package
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 |
| 2 | Anode (A) | Connected to ground or lower-potential reference; completes reverse-bias path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Low 50 µA test current | Enables stable voltage reference in micropower sensor biasing and IoT endpoint circuits |
| Optimized leakage profile | Intentional minor leakage improves switching speed and reduces noise in feedback loops |
| Thermal resistance | Rth(j-a) = 415 K/W; informs derating requirements on standard FR4 PCB layouts |
| Non-repetitive surge rating | 40 W at tp = 100 µs; provides transient overvoltage clamping capability |
Applications
| Automotive Cabin Sensors | Industrial PLC Input Conditioning |
|---|---|
Use Scenario: Voltage reference for MEMS pressure and humidity sensors in HVAC control modules. IC Role / Device Role / Timing Role: Shunt regulator providing stable 43 V bias to analog front-end amplifiers and ADC references. Use Value: Maintains ±5 % regulation accuracy across −40 °C to +125 °C ambient, meeting AEC-Q100 Grade 2 requirements. |
Use Scenario: Overvoltage clamp on 24 V digital input channels in programmable logic controllers. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting optocoupler input stages from inductive kickback. Use Value: Limits input voltage to ≤43 V with 40 W surge capability, preventing damage during relay coil de-energization. |
| Portable Medical Instrumentation | Smart Meter Reference Supply |
Use Scenario: Precision bias source for low-power ECG amplifier stages in handheld diagnostic devices. IC Role / Device Role / Timing Role: Low-current Zener reference enabling <10 µA quiescent current in signal chain bias networks. Use Value: Delivers stable 43 V reference at 50 µA test current, minimizing battery drain while maintaining SNR integrity. |
Use Scenario: Secondary voltage reference for isolated power supply monitoring in electricity meters. IC Role / Device Role / Timing Role: Shunt regulator stabilizing auxiliary 43 V rail used for metrology IC bias and tamper-detection circuitry. Use Value: Ensures long-term drift <±0.5 %/1000 h under 85 °C operating conditions, supporting 10-year meter calibration validity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX38450-B43-Q | ±2 % tolerance (vs. ±5 %), higher initial cost, tighter VZ distribution | Preferred where absolute voltage accuracy > regulation stability under low IZ | Select when system-level calibration budget requires <±0.85 V deviation at 43 V |
| MMSZ43ET1G | Same 43 V nominal, SOD-123 package, Rth(j-a) = 500 K/W, no AEC-Q101 qualification | Suitable for industrial but not automotive deployments due to qualification gap | Choose only for cost-sensitive non-automotive designs with relaxed thermal and reliability requirements |
Compared with BZX38450-C43-QF, the BZX38450-B43-Q offers tighter tolerance for precision biasing but lacks optimized leakage for noise-sensitive applications, while MMSZ43ET1G sacrifices automotive qualification and thermal performance for lower unit cost in commercial-grade systems.
Availability
BZX38450-C43-QF is available at Aetrix Electronics and suitable for automotive cabin electronics, industrial PLC input protection, and portable medical instrumentation requiring stable component supply with AEC-Q101 compliance and traceable sourcing.
Supply support for BZX38450-C43-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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and automotive-grade quality.
The BZX38450-Q series belongs to Nexperia's automotive-qualified Zener regulator portfolio, designed specifically for low-power, high-stability voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the maximum continuous reverse power dissipation for BZX38450-C43-QF at 85 °C ambient?
At 85 °C ambient, the device must be derated from its 300 mW rating at 25 °C using the thermal resistance Rth(j-a) = 415 K/W. The maximum allowable power is 300 mW × (1 − (85 − 25)/125) = 156 mW, ensuring junction temperature remains below 150 °C under steady-state operation.
How does the "C" suffix in BZX38450-C43-QF affect its electrical behavior versus the "B" variant?
The "C" suffix denotes ±5 % tolerance and incorporates an intentional minor rise in leakage current per AN90031, which reduces noise and improves switching response in dynamic regulation circuits. In contrast, the "B" variant offers ±2 % tolerance but lacks this leakage optimization, making it better suited for static reference applications demanding tighter voltage accuracy.
Can BZX38450-C43-QF be used in series to achieve higher regulated voltages?
No - BZX38450-C43-QF is not characterized or guaranteed for series connection. Its differential resistance (375 Ω), temperature coefficient (+0.05 mV/K), and leakage profile are specified for single-device operation. Series stacking introduces mismatched thermal gradients and uncontrolled current sharing, risking thermal runaway or regulation failure.
What is the significance of the 50 µA test current specification for this Zener diode?
The 50 µA test current reflects the minimum operating point at which the 43 V Zener voltage is guaranteed within ±5 % tolerance. It enables reliable regulation in ultra-low-power circuits such as battery-backed real-time clocks or energy-harvesting sensors, where typical bias currents fall between 10–100 µA and conventional Zeners would fail to regulate.
BZX38450-C43-QF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-C43-QF FAQ
1.How can I place an order for BZX38450-C43-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C43-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-C43-QF reliable?
The price and inventory of BZX38450-C43-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-C43-QF is usually 5 days.
3.What payment methods are accepted for BZX38450-C43-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C43-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C43-QF?
BZX38450-C43-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C43-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-C43-QF?
For technical support, including BZX38450-C43-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C43-QF requirements.
6.How does Aetrix verify that BZX38450-C43-QF is sourced from the original manufacturer or authorized distributors?
All BZX38450-C43-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-C43-QF meets industry standards.
7.What is the process for return or replacement of BZX38450-C43-QF?
All BZX38450-C43-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C43-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-C43-QF part is unused and in its original packaging.
Return procedure for BZX38450-C43-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C43-QF 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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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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