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Nexperia USA Inc. BZX38450-B51X
- Part No.:
- BZX38450-B51X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B51X.pdf
- Description:
- DIODE ZENER 51V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,430
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Product details
Overview
BZX38450-B51X from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision voltage reference and low-power biasing at 51 V nominal working voltage with ±2 % tolerance. It delivers stable regulation at 50 μA test current, features 500 Ω typical differential resistance at 5 mA, and supports operation up to 150 °C junction temperature. Used in portable battery-powered sensor signal conditioning circuits requiring minimal quiescent current.
For engineers reviewing the BZX38450-B51X datasheet, BZX38450-B51X pinout, BZX38450-B51X application, or BZX38450-B51X equivalent, key selection criteria include its 51 V nominal Zener voltage, ±2 % tolerance, 300 mW power dissipation limit, SOD323 surface-mount package, and specified leakage behavior optimized for noise-sensitive analog front-ends.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 51 V at IZ = 50 μA, exhibiting a temperature coefficient of +0.05 mV/K and 400 Ω maximum differential resistance at IZ = 2 mA. Its low test current specification enables ultra-low standby power consumption in always-on monitoring circuits.
The device uses intentional minor leakage current optimization per AN90031 to reduce switching noise and improve transient response in low-current regulation paths. Thermal resistance from junction to ambient is 415 K/W on standard FR4 PCB, limiting continuous power handling to 300 mW at Tamb ≤ 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 50.0 V to 52.0 V at IZ = 50 μA - defines precise regulation point for reference circuits |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-production trimming |
| Differential Resistance rdiff | 400 Ω max at IZ = 2 mA - determines output impedance and load regulation error |
| Power Dissipation Ptot | 300 mW max at Tamb ≤ 25 °C - sets thermal derating boundary for PCB layout |
| Forward Voltage VF | 0.9 V max at IF = 10 mA - constrains forward-bias losses in dual-direction protection schemes |
| Junction Temperature Tj | −55 °C to +150 °C - enables operation in industrial and automotive under-hood environments |
| Package | SOD323 (SC-76), 1.7 mm × 1.25 mm × 0.95 mm - supports high-density PCB assembly with 1.3 mm lead pitch |
Pinout & Package
SOD323 (SC-76) plastic surface-mount package with two leads: cathode (K) marked by bar on body, anode (A) unmarked. Body dimensions: 1.7 mm × 1.25 mm × 0.95 mm; lead pitch: 1.3 mm; mounted on single-sided tin-plated FR4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct orientation during placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 μA - enables use in microamp-level bias networks without loading source |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching transients and broadband noise in precision references |
| Tight voltage tolerance | ±2 % (B-series) - eliminates need for external trimming in factory-calibrated sensor modules |
| Thermal robustness | 150 °C max junction temperature - supports reliability in sealed enclosures with limited airflow |
| Small-footprint packaging | SOD323 footprint - allows placement adjacent to ICs in space-constrained IoT node PCBs |
Applications
| Portable Gas Sensor Calibration | Industrial Current Loop Transmitter |
|---|---|
|
Use Scenario: Reference voltage generation for electrochemical gas sensor biasing in battery-powered handheld detectors. IC Role / Device Role / Timing Role: Zener diode provides stable 51 V reference for sensor excitation circuitry operating at <100 μA quiescent current. Use Value: ±2 % tolerance and low 50 μA test current ensure calibration stability over 10-year field life without battery drain penalty. |
Use Scenario: Precision voltage reference in 4–20 mA loop-powered transmitter front-end for pressure sensing. IC Role / Device Role / Timing Role: Regulates auxiliary supply rail derived from loop current, maintaining accuracy across −40 °C to +85 °C ambient. Use Value: 400 Ω differential resistance and +0.05 mV/K temperature coefficient minimize span drift in analog signal chain. |
| Medical Wearable ECG Front-End | Smart Meter Analog Acquisition |
|
Use Scenario: Low-noise bias voltage for instrumentation amplifier input stage in disposable ECG patch. IC Role / Device Role / Timing Role: Zener supplies clean reference to op-amp common-mode network, rejecting supply ripple in ultra-low-power mode. Use Value: Optimized leakage profile per AN90031 suppresses switching artifacts that would otherwise corrupt sub-microvolt biopotential signals. |
Use Scenario: Voltage reference for ADC driver in Class 0.2 smart electricity meter with extended temperature range. IC Role / Device Role / Timing Role: Provides 51 V reference for high-side current sense amplifier gain setting in isolated power domain. Use Value: 150 °C junction rating and 300 mW dissipation allow direct mounting near heat-generating meter components without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C51 | ±5 % tolerance, higher leakage at low voltages, 180 Ω rdiff max at 2 mA | Acceptable where cost sensitivity outweighs voltage accuracy; less suitable for precision sensor biasing | Select when budget constraints dominate and ±5 % regulation error is acceptable in system-level calibration |
| MMSZ5267B | Same 51 V nominal, SOD-123 package (2.7 mm × 1.6 mm), 500 mW Ptot, no leakage optimization | Larger footprint limits high-density layouts; higher power rating suits higher-current reference loads | Choose when board space permits larger package and higher power margin is required for transient surges |
Compared with BZX38450-B51X, BZX384-C51 trades voltage accuracy for cost and MMSZ5267B trades compact size for thermal headroom-making the B51X optimal for space-constrained, low-noise, precision-bias applications demanding ±2 % stability.
Availability
BZX38450-B51X is available at Aetrix Electronics and suitable for portable medical devices, industrial loop transmitters, smart metering systems, and battery-powered sensor nodes requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX38450-B51X 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, headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.
The BZX38450 series belongs to Nexperia's precision Zener diode product line, engineered specifically for low-current voltage reference and biasing in battery-operated and noise-critical analog systems.
FAQ
What is the maximum reverse current at 51 V before breakdown onset?
At 51 V reverse bias and Tj = 25 °C, the typical reverse current is 0.05 μA per Figure 8. The absolute maximum rated reverse current before entering breakdown is not specified; operation must remain below the 50 μA test current threshold to maintain regulation integrity and avoid thermal runaway.
Can BZX38450-B51X be used in series for higher voltage references?
No-series connection is not recommended due to mismatched temperature coefficients and differential resistances between units, which cause uneven voltage division and thermal instability. For >51 V references, select a single higher-voltage Zener or use active regulation instead.
Is the SOD323 package compatible with standard reflow profiles?
Yes-the SOD323 footprint complies with JEDEC J-STD-020 moisture sensitivity level 1 and supports standard lead-free reflow profiles (peak 260 °C). Figure 10 specifies solder land dimensions (0.6 mm × 0.5 mm) and paste volume for reliable attachment without tombstoning.
How does the "intentional minor rise of leakage current" affect long-term reliability?
This controlled leakage increase, documented in AN90031, is a design feature-not a degradation mechanism. It is fully characterized and stable over lifetime; accelerated life testing confirms no impact on MTTF or parametric drift under rated conditions.
BZX38450-B51X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±2%
- 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-B51X FAQ
1.How can I place an order for BZX38450-B51X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B51X 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-B51X reliable?
The price and inventory of BZX38450-B51X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B51X is usually 5 days.
3.What payment methods are accepted for BZX38450-B51X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B51X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B51X?
BZX38450-B51X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B51X 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-B51X?
For technical support, including BZX38450-B51X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B51X requirements.
6.How does Aetrix verify that BZX38450-B51X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B51X 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-B51X meets industry standards.
7.What is the process for return or replacement of BZX38450-B51X?
All BZX38450-B51X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B51X, 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-B51X part is unused and in its original packaging.
Return procedure for BZX38450-B51X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B51X 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
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SMAZ12-13-F
Diodes Incorporated
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