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Nexperia USA Inc. BZX38450-C51-QF
- Part No.:
- BZX38450-C51-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C51-QF.pdf
- Description:
- DIODE ZENER 51V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,968
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Product details
Overview
BZX38450-C51-Q from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 51 V nominal Zener 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-C51-Q datasheet, BZX38450-C51-Q pinout, BZX38450-C51-Q application, or BZX38450-C51-Q equivalent, this part serves as a precision low-bias voltage reference in battery-powered sensor nodes, automotive body electronics, and ECU voltage monitoring circuits where leakage current optimization and fast switching are critical.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable reverse breakdown at 51 V under low quiescent current (IZ = 50 µA), with intentional minor leakage rise per AN90031 to reduce noise and improve transient response. Its differential resistance is 400 Ω at IZ = 2 mA.
Thermal resistance from junction to ambient is 415 K/W on FR4 PCB; junction temperature is rated to 150 °C. It exhibits a positive temperature coefficient of +0.05 mV/K and diode capacitance of 40 pF at VR = 0 V, f = 1 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V nominal at IZ = 50 µA; ±5 % tolerance ensures predictable clamping in low-power bias networks |
| Power Dissipation (Ptot) | 300 mW max at Tamb ≤ 25 °C; supports continuous operation in compact SMD layouts without forced cooling |
| Differential Resistance (rdiff) | 400 Ω max at IZ = 2 mA; maintains regulation stability under small load variations |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA; enables reliable anode-cathode conduction during forward bias conditions |
| Reverse Current (IR) | 0.05 µA max at VR = 38.3 V; ultra-low leakage preserves battery life in always-on automotive modules |
| Thermal Resistance (Rth(j-a)) | 415 K/W on FR4 PCB; defines thermal derating curve for ambient temperature up to +150 °C |
| Package | SOD323 (SC-76); 1.7 mm × 1.25 mm × 0.95 mm footprint ideal for space-constrained PCBs |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package with 2 leads, 1.3 mm pitch, and cathode marked by a bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt regulation path during reverse breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in microamp-level bias rails for ultra-low-power sensors and wake-up circuits |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching noise and improves transient immunity in EMI-sensitive ECUs |
| AEC-Q101 qualification | Qualified for automotive applications - meets stress-test requirements for temperature cycling, HTRB, and ESD robustness |
| Tight voltage tolerance | ±5 % (C-series) - provides consistent clamping across production lots without post-assembly trimming |
| Small-outline packaging | SOD323 footprint - saves >60 % board area vs. DO-35, enabling high-density routing in ADAS camera modules |
Applications
| Automotive Body Control Module (BCM) | Portable Gas Sensor Interface |
|---|---|
Use Scenario: Voltage reference for analog front-end of LIN-connected door lock actuator MCU. IC Role / Device Role / Timing Role: Shunt regulator providing stable 51 V rail for overvoltage protection circuitry and isolated feedback sensing. Use Value: Low 50 µA test current minimizes standby power draw; AEC-Q101 rating ensures reliability over 15-year vehicle lifecycle. |
Use Scenario: Bias supply for electrochemical CO sensor requiring precise excitation voltage. IC Role / Device Role / Timing Role: Zener reference establishing fixed 51 V potential across sensor electrodes in battery-operated handheld detector. Use Value: 400 Ω rdiff ensures minimal drift under varying sensor load; 40 pF capacitance avoids signal coupling in high-impedance measurement paths. |
| Industrial PLC Input Protection | Smart Rearview Mirror Power Management |
Use Scenario: Overvoltage clamp on 24 V DC input channel of DIN-rail mounted controller. IC Role / Device Role / Timing Role: Transient suppressor absorbing induced surges while maintaining steady-state regulation at 51 V. Use Value: 40 W non-repetitive peak power handling (tp = 100 µs) protects downstream ADCs; SOD323 allows placement near connector entry point. |
Use Scenario: Reference voltage source for auto-dimming control loop in automotive rearview mirror. IC Role / Device Role / Timing Role: Stable 51 V Zener supplying bias to op-amp comparator monitoring ambient light sensor output. Use Value: +0.05 mV/K tempco limits drift to <0.8 V over −40 °C to +125 °C operating range; cathode-bar marking prevents assembly errors. |
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-B51-Q | ±2 % tolerance vs. ±5 %; higher initial cost; tighter VZ distribution | Used where absolute voltage accuracy is prioritized over cost in calibration-critical instrumentation | Select when system-level calibration budget permits tighter tolerance and test current remains ≥50 µA |
| MMSZ5257ET1G | 51 V nominal, ±5 %, but rated at 20 mA test current; 500 mW Ptot; no AEC-Q101 qualification | Suitable for industrial consumer-grade power supplies, not automotive safety-critical functions | Choose only for non-automotive designs requiring higher power margin and no automotive qualification |
Compared with BZX38450-C51-Q, the BZX38450-B51-Q offers tighter voltage control at identical low-bias operation, while MMSZ5257ET1G trades automotive qualification for higher power handling and higher test current - making it unsuitable for battery-sensitive or AEC-compliant systems.
Availability
BZX38450-C51-Q is available at Aetrix Electronics and suitable for automotive body electronics, portable gas detection systems, industrial PLC input protection, and smart rearview mirror power management requiring stable component supply across extended temperature ranges and long-lifecycle programs.
Supply support for BZX38450-C51-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, designed specifically for low-current voltage regulation in automotive and industrial environments where space, power, and reliability are constrained.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX38450-C51-Q has a nominal Zener voltage of 51 V at IZ = 50 µA, with a guaranteed minimum breakdown voltage of 48.0 V and maximum of 54.0 V per datasheet Table 9. It is not rated for sustained operation above its specified VZ range; exceeding 54 V risks irreversible avalanche degradation.
Can this diode be used in series or parallel configurations for higher voltage or current handling?
No - BZX38450-C51-Q is not characterized for series or parallel operation. Its ±5 % tolerance and mismatched temperature coefficients cause uneven voltage sharing. For higher voltage, select a single diode with appropriate VZ; for higher current, use an active regulator or discrete transistor-based shunt.
Is the SOD323 package compatible with standard reflow soldering profiles?
Yes - Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. The SOD323 footprint in Figure 10 supports peak temperatures up to 260 °C for ≤ 30 seconds. Thermal resistance data assumes standard FR4 PCB with single-sided 1 oz copper and tin plating.
How does the "intentional minor rise of leakage current" affect long-term reliability?
This controlled leakage increase (per AN90031) is implemented via process tuning and does not impact lifetime or failure rate. Accelerated life testing under AEC-Q101 confirms >1000 hours HTOL at 150 °C junction temperature with no parametric shift beyond specification limits.
BZX38450-C51-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):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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-C51-QF FAQ
1.How can I place an order for BZX38450-C51-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C51-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-C51-QF reliable?
The price and inventory of BZX38450-C51-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-C51-QF is usually 5 days.
3.What payment methods are accepted for BZX38450-C51-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C51-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C51-QF?
BZX38450-C51-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C51-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-C51-QF?
For technical support, including BZX38450-C51-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C51-QF requirements.
6.How does Aetrix verify that BZX38450-C51-QF is sourced from the original manufacturer or authorized distributors?
All BZX38450-C51-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-C51-QF meets industry standards.
7.What is the process for return or replacement of BZX38450-C51-QF?
All BZX38450-C51-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C51-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-C51-QF part is unused and in its original packaging.
Return procedure for BZX38450-C51-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C51-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
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MMSZ5245BS-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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