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Nexperia USA Inc. BZX38450-C51F
- Part No.:
- BZX38450-C51F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C51F.pdf
- Description:
- DIODE ZENER 51V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,605
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Product details
Overview
BZX38450-C51F from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision voltage reference and regulation at 51 V nominal working voltage with ±5 % tolerance. It delivers stable regulation at 50 µA test current, features 400 Ω differential resistance at 2 mA, and supports low-power portable electronics requiring minimal bias current.
For engineers reviewing the BZX38450-C51F datasheet, BZX38450-C51F pinout, BZX38450-C51F application, or BZX38450-C51F equivalent, this page provides verified electrical characteristics, thermal behavior, SOD323 footprint details, and real-world use cases in battery-powered sensing and signal conditioning circuits.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable 51 V reverse breakdown voltage across its cathode–anode terminals under controlled current conditions. Its specified 50 µA test current enables ultra-low quiescent operation, while intentional leakage optimization improves switching speed and noise performance per AN90031.
The diode exhibits a positive temperature coefficient of +0.05 mV/K and 40 pF capacitance at 0 V, making it suitable for low-frequency reference applications where thermal drift and parasitic coupling must be minimized. Thermal resistance from junction to solder point is 110 K/W, supporting reliable operation on standard FR4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 51 V ±5 % - precise regulation point for 5V–51V reference systems |
| Differential Resistance | 400 Ω at IZ = 2 mA - defines voltage stability under small load variations |
| Test Current | 50 µA - enables operation in micro-power circuits without compromising regulation accuracy |
| Forward Voltage | 0.9 V at IF = 10 mA - ensures predictable conduction during forward-bias fault conditions |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - sets maximum continuous power handling on standard PCB layout |
| Junction Temperature Limit | 150 °C - defines upper thermal operating boundary for reliability in compact enclosures |
| Reverse Leakage Current | ≤ 0.05 µA at VR = 48.5 V - ensures minimal standby current in high-impedance bias networks |
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. Cathode identified by marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity-sensitive terminal for reverse-bias operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables use in nanoampere-bias sensor front-ends and energy-harvesting circuits |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching transients and broadband noise in feedback loops |
| Thermal performance | Rth(j-sp) = 110 K/W - allows direct thermal coupling to PCB copper for passive cooling in space-constrained layouts |
| Stable voltage coefficient | +0.05 mV/K - minimizes drift over industrial temperature range (−55 °C to +150 °C) |
| Small-footprint packaging | SOD323 outline - supports high-density routing and automated placement in portable and wearable designs |
Applications
| Portable Battery Monitor | Industrial Sensor Reference |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage in handheld medical devices using a 16-bit ADC with external reference. IC Role / Device Role / Timing Role: Provides stable 51 V Zener reference for ADC input scaling and overvoltage clamp protection. Use Value: Enables accurate 0.1 % full-scale measurement at <1 µA quiescent current, extending battery life beyond 12 months. |
Use Scenario: Precision temperature sensing in factory automation nodes with 4–20 mA loop interface. IC Role / Device Role / Timing Role: Supplies regulated bias to RTD bridge and op-amp instrumentation amplifier. Use Value: Maintains <±0.5 % reference stability over −40 °C to +85 °C ambient, eliminating calibration drift. |
| IoT Node Power Sequencing | Low-Power Signal Conditioning |
Use Scenario: Enabling controlled startup of RF transceiver and MCU subsystems in LPWAN edge sensors. IC Role / Device Role / Timing Role: Acts as voltage threshold detector and reset supervisor via comparator input. Use Value: Delivers repeatable 51 V trip point with <100 ns response, ensuring deterministic power-up sequence. |
Use Scenario: Biasing photodiode amplifiers in optical smoke detectors with ultra-low standby consumption. IC Role / Device Role / Timing Role: Sets DC operating point for transimpedance amplifier while clamping transient surges. Use Value: Limits input-stage overvoltage to <52 V with <0.5 nA leakage, preserving dynamic range and SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX38450-B51 | ±2 % tolerance, 300 Ω rdiff at 5 mA, tighter VZ spec but higher test current (5 mA) | Better accuracy for metrology-grade references; requires higher bias current | Select when absolute voltage precision > stability at ultra-low current |
| MMBZ5257BS | 51 V ±5 %, SOT-323 package, 600 mW Ptot, 1000 Ω rdiff at 20 mA | Higher power handling but poorer regulation at microamp currents; larger footprint | Select only if board layout permits SOT-323 and system can supply ≥20 mA bias |
Compared with BZX38450-B51, the C51F trades absolute tolerance for lower operating current and optimized noise; versus MMBZ5257BS, it delivers superior low-current regulation and 40 % smaller PCB area at the cost of 50 % lower power rating.
Availability
BZX38450-C51F is available at Aetrix Electronics and suitable for portable medical monitors, industrial sensor nodes, LPWAN edge devices, and optical smoke detectors requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX38450-C51F 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 logic, discrete, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and space-constrained applications demanding stable voltage references below 100 µA bias.
FAQ
What is the maximum reverse voltage before breakdown for BZX38450-C51F?
The nominal Zener voltage is 51 V with ±5 % tolerance, meaning the guaranteed breakdown range is 48.45 V to 53.55 V at IZ = 2 mA. Absolute maximum non-repetitive peak reverse voltage is not specified; sustained operation above 53.55 V risks thermal runaway due to 300 mW power limit.
Can BZX38450-C51F be used in series for higher voltage references?
No - the device is not characterized for series operation. Differential resistance mismatch, thermal coupling imbalance, and tolerance stacking would cause unpredictable voltage division and potential thermal instability. Use a single higher-voltage Zener or dedicated reference IC instead.
Is the SOD323 package compatible with standard reflow profiles?
Yes - Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. The recommended peak temperature is 260 °C for ≤ 30 seconds, with preheat ramp rate ≤ 3 °C/s. Figure 10 in the datasheet provides exact solder land dimensions for optimal wetting and void control.
Does BZX38450-C51F meet automotive AEC-Q200 requirements?
No - this part is not AEC-Q200 qualified. Nexperia explicitly states in Section 14 that non-automotive qualified products like BZX38450-C51F are unsuitable for automotive safety-critical systems. For automotive use, select the AEC-Q200–qualified BZX84-C51 variant instead.
BZX38450-C51F 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-C51F FAQ
1.How can I place an order for BZX38450-C51F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C51F 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-C51F reliable?
The price and inventory of BZX38450-C51F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C51F is usually 5 days.
3.What payment methods are accepted for BZX38450-C51F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C51F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C51F?
BZX38450-C51F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C51F 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-C51F?
For technical support, including BZX38450-C51F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C51F requirements.
6.How does Aetrix verify that BZX38450-C51F is sourced from the original manufacturer or authorized distributors?
All BZX38450-C51F 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-C51F meets industry standards.
7.What is the process for return or replacement of BZX38450-C51F?
All BZX38450-C51F units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C51F, 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-C51F part is unused and in its original packaging.
Return procedure for BZX38450-C51F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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