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Nexperia USA Inc. BZX38450-C51-QX
- Part No.:
- BZX38450-C51-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C51-QX.pdf
- Description:
- DIODE ZENER 51V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,334
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Product details
Overview
BZX38450-C51-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 51 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-C51-QX datasheet, BZX38450-C51-QX pinout, BZX38450-C51-QX application, or BZX38450-C51-QX equivalent, this device is selected for precision low-bias voltage reference, ESD-tolerant signal clamping, and battery-powered system regulation where leakage optimization and thermal stability are critical.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified VZ of 48.0–54.0 V at IZ = 2 mA, exhibiting a positive temperature coefficient of +0.05 mV/K and differential resistance of 400 Ω at IZ = 2 mA. Its intentional minor rise in leakage current improves switching speed and noise reduction per AN90031.
Designed for ambient temperatures from −55 °C to +150 °C and junction temperatures up to 150 °C, it delivers stable regulation under low-current bias (50 µA), making it suitable for always-on automotive subsystems and ultra-low-power sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VZ) | 48.0 V to 54.0 V at IZ = 2 mA - defines precise regulation band for 51 V nominal rail stabilization |
| Tolerance | ±5 % - tighter than standard Zeners for consistent voltage reference across production lots |
| Test Current (IZ) | 2 mA - enables stable operation at ultra-low bias, reducing quiescent power in battery systems |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - supports continuous operation on FR4 PCB without heatsinking |
| Differential Resistance | 400 Ω at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Reverse Leakage (IR) | < 0.05 µA at VR = 40.8 V - minimized leakage preserves battery life in sleep-mode circuits |
| Thermal Resistance (Rth(j-a)) | 415 K/W - limits self-heating under sustained regulation, critical for compact automotive modules |
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 marker determines correct orientation for reverse-bias operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes Zener conduction path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current specification | Rated at 50 µA - enables reliable regulation in microamp-level bias networks common in IoT sensors |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching transients and high-frequency noise in feedback paths |
| AEC-Q101 qualification | Qualified for automotive applications - ensures reliability under thermal cycling, humidity, and mechanical stress per automotive standards |
| Small-footprint SOD323 | 1.7 mm × 1.25 mm footprint - saves board space in dense ADAS camera modules and body control units |
| Two tolerance options | ±2 % (B-series) and ±5 % (C-series) - allows cost/performance trade-off without redesigning layout or bill of materials |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for LIN bus transceiver bias and microcontroller I/O protection circuitry. IC Role / Device Role / Timing Role: Zener clamp and voltage reference for 12 V rail monitoring and level-shifting. Use Value: ±5 % tolerance and AEC-Q101 qualification ensure long-term stability across −40 °C to +125 °C operating range. |
Use Scenario: Providing stable 51 V reference for isolated current-sense amplifier feedback in motor drive enclosures. IC Role / Device Role / Timing Role: Precision shunt regulator establishing fixed reference point for analog front-end calibration. Use Value: 400 Ω differential resistance minimizes error drift under varying load currents in 4–20 mA loop interfaces. |
| Portable Medical Diagnostic Device | Smart Energy Meter Voltage Monitoring |
Use Scenario: Biasing photodiode amplifier stages in battery-powered pulse oximeters requiring ultra-low standby current. IC Role / Device Role / Timing Role: Low-leakage voltage reference enabling sub-µA sleep-mode operation while retaining fast wake-up response. Use Value: Specified at 50 µA test current and < 0.05 µA leakage at 40.8 V directly supports multi-year battery life targets. |
Use Scenario: Clamping and scaling AC mains-derived DC rails in Class 0.5 smart meters with stringent accuracy requirements. IC Role / Device Role / Timing Role: Overvoltage protector and reference stabilizer for ADC input conditioning stage. Use Value: 48.0–54.0 V VZ range accommodates 50 V nominal meter supply with margin for line surges and aging drift. |
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 %), same VZ range and SOD323 package | Higher precision required in closed-loop feedback or metrology-grade references | Select when absolute voltage accuracy outweighs cost sensitivity and leakage optimization is secondary |
| MMSZ5257ET1G | 51 V nominal, ±5 %, but rated at 20 mA test current and higher Ptot (500 mW) | Higher power handling needed in non-battery applications with transient overloads | Choose only if thermal margin exceeds 300 mW requirement and AEC-Q101 qualification is not mandatory |
Compared with BZX38450-C51-QX, the BZX38450-B51-Q offers tighter tolerance at identical form factor and automotive qualification, while MMSZ5257ET1G trades AEC-Q101 compliance and low-IZ optimization for higher power headroom-making the C51-QX optimal for space-constrained, battery-sensitive automotive and portable designs.
Availability
BZX38450-C51-QX is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, portable medical diagnostics, and smart energy metering requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZX38450-C51-QX 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-enhancing components, delivering high-performance, reliable, and scalable solutions for automotive, industrial, and consumer markets.
The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, high-stability voltage regulation in automotive subsystems and battery-constrained embedded systems.
FAQ
What is the maximum reverse voltage (VR) before breakdown for BZX38450-C51-QX?
The device exhibits controlled Zener breakdown between 48.0 V and 54.0 V at IZ = 2 mA. Below 40.8 V, reverse leakage remains below 0.05 µA - confirming no significant conduction occurs outside its specified regulation band. Absolute maximum reverse voltage is not defined; operation beyond VZ max risks irreversible damage per IEC 60134 limiting values.
Does BZX38450-C51-QX support reflow soldering, and what footprint is recommended?
Yes, it is qualified for lead-free reflow soldering using the SOD323 footprint shown in Figure 10: 0.6 mm × 0.5 mm solder lands, 1.15 mm center-to-center spacing, with 0.40 mm solder mask clearance. The 1.7 mm × 1.25 mm body requires strict alignment to avoid tombstoning, and peak temperature must not exceed 260 °C for ≤ 30 seconds per J-STD-020.
How does the "intentional minor rise of leakage current" improve performance?
Per application note AN90031, this controlled increase in reverse leakage at voltages just below VZ reduces minority-carrier storage time, enabling faster turn-on/turn-off transitions and lower high-frequency noise in regulation loops - particularly beneficial in PWM-controlled power supplies and fast-response sensor bias networks.
Is BZX38450-C51-QX suitable for bidirectional ESD protection?
No - it is a unidirectional Zener diode optimized for reverse-bias regulation only. Its forward voltage is 0.9 V at 10 mA, but it lacks symmetric clamping characteristics or IEC 61000-4-2 rating for ESD. For bidirectional protection, discrete TVS arrays or purpose-built ESD diodes such as PESD5V0S1BA should be used instead.
BZX38450-C51-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- 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-QX FAQ
1.How can I place an order for BZX38450-C51-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C51-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-C51-QX reliable?
The price and inventory of BZX38450-C51-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-C51-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-C51-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C51-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C51-QX?
BZX38450-C51-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C51-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-C51-QX?
For technical support, including BZX38450-C51-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C51-QX requirements.
6.How does Aetrix verify that BZX38450-C51-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-C51-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-C51-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-C51-QX?
All BZX38450-C51-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C51-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-C51-QX part is unused and in its original packaging.
Return procedure for BZX38450-C51-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C51-QX Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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