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Nexperia USA Inc. BZX38450-B27X
- Part No.:
- BZX38450-B27X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B27X.pdf
- Description:
- DIODE ZENER 27V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,549
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Product details
Overview
BZX38450-B27X from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 27 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 50 Ω typical differential resistance at 5 mA - ideal for battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX38450-B27X datasheet, BZX38450-B27X pinout, BZX38450-B27X application, or BZX38450-B27X equivalent, key selection criteria include its low 50 µA regulation test current, tight ±2 % tolerance, 27 V nominal Zener voltage, thermal resistance of 415 K/W (junction-to-ambient), and SOD323 footprint compatibility with space-constrained PCB layouts.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across varying load currents by conducting reverse-biased Zener breakdown. Its specified regulation at 50 µA enables operation in micro-power domains where traditional regulators draw excessive quiescent current.
The BZX38450-B27X exhibits a positive temperature coefficient of +21.4 mV/K at 27 V and 5 mA, and a diode capacitance of 25.3 pF at 0 V and 1 MHz - parameters critical for noise-sensitive analog references and high-frequency bypass stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.5 V to 27.5 V at IZ = 50 µA - defines precise regulation point for low-bias reference design |
| Tolerance | ±2 % - ensures voltage accuracy without post-production trimming in production-grade analog circuits |
| Differential Resistance (rdiff) | 300 Ω max at IZ = 5 mA - determines output impedance and load regulation error under dynamic current changes |
| Reverse Current (IR) | 0.05 µA max at VR = 20.4 V - guarantees minimal leakage in high-impedance bias networks |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous power handling in standard SMT layout |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - defines anode-cathode drop during forward conduction, relevant for polarity protection |
| Junction-to-Ambient Rth | 415 K/W - quantifies thermal rise per watt in free-air mounting, guiding derating for ambient temperature margins |
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; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes Zener shunt path for voltage stabilization |
Key Features
| Feature | Design Value |
|---|---|
| Low test current regulation | Specified at 50 µA - enables use in nanoampere-bias circuits like CMOS oscillator references and IoT wake-up comparators |
| Tight voltage tolerance | ±2 % option (B-series) - eliminates need for external trimming in factory-calibrated sensor signal chains |
| Optimized leakage profile | Intentional minor leakage rise per AN90031 - improves switching speed and reduces noise in fast transient detection circuits |
| Thermal performance | Rth(j-sp) = 110 K/W to cathode solder point - supports reliable thermal transfer in thermally constrained modules |
Applications
| Portable Battery Monitor | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage in wearables using ultra-low-quiescent-current ADC reference. IC Role / Device Role / Timing Role: Provides stable 27 V Zener reference for resistive divider scaling, enabling accurate 0–4.2 V measurement with 16-bit resolution. Use Value: 50 µA regulation current minimizes battery drain, extending operational life beyond 12 months on coin-cell power. |
Use Scenario: Biasing precision op-amps in 4–20 mA loop transmitters deployed in hazardous-area field instruments. IC Role / Device Role / Timing Role: Acts as shunt reference for current-loop voltage-to-current conversion stage, ensuring compliance with IEC 61000-4 immunity requirements. Use Value: ±2 % tolerance and 300 Ω rdiff maintain loop accuracy within ±0.1 % full-scale error across −40 °C to +85 °C. |
| Medical Pulse Oximeter Front-End | Automotive Cabin Control MCU Reference |
|
Use Scenario: Supplying stable bias to photodiode transimpedance amplifier in battery-operated pulse oximeters. IC Role / Device Role / Timing Role: Regulates virtual ground and reference voltage for dual-channel analog front-end, rejecting supply ripple from shared LDO. Use Value: 25.3 pF capacitance and low leakage prevent phase shift in 100 Hz–10 kHz optical signal band, preserving SpO₂ calculation fidelity. |
Use Scenario: Providing reset threshold and brown-out detection reference for infotainment MCU in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Configured as overvoltage clamp and undervoltage monitor via resistor divider, interfacing directly with MCU GPIO. Use Value: 27 V rating allows robust 12 V system margining; 415 K/W Rth(j-a) ensures thermal stability during engine-bay temperature cycling. |
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-C27 | ±5 % tolerance, higher leakage (0.1 µA at 20.4 V), same SOD323 package and 27 V nominal | Acceptable where cost sensitivity outweighs precision; unsuitable for <0.5 % system accuracy targets | Select when budget constraints dominate and calibration is performed at system level |
| MMSZ5256B | 27 V nominal, ±5 %, 500 mW Ptot, SOD-123 package (larger footprint, 2.7 mm × 1.6 mm) | Higher power capability but incompatible with dense SOD323 layouts; requires PCB redesign | Choose only if thermal headroom >300 mW is mandatory and board area permits larger package |
Compared with BZX38450-B27X, the BZX384-C27 trades precision for cost in non-critical references, while MMSZ5256B offers higher power at the expense of board space and thermal interface compatibility - making the BZX38450-B27X optimal for miniaturized, accuracy-driven designs.
Availability
BZX38450-B27X is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor transmitters, battery-powered instrumentation, and automotive cabin control modules requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX38450-B27X 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 advanced packaging and automotive-qualified components.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for ultra-low-power voltage reference and biasing in portable, battery-constrained, and space-limited electronic systems.
FAQ
What is the maximum reverse voltage the BZX38450-B27X can withstand before breakdown?
The BZX38450-B27X has a nominal Zener voltage of 27 V, with a guaranteed breakdown range of 26.5 V to 27.5 V at 50 µA test current. Its absolute maximum non-repetitive peak reverse voltage is not specified separately; instead, it is limited by the 40 W non-repetitive surge rating at 100 µs pulse width, corresponding to ~27 V × 1.48 A. Continuous operation must remain within the 27 V regulation band.
Can BZX38450-B27X be used in series or parallel configurations?
Series connection is permissible for higher reference voltages, provided current sharing is balanced via matched units and thermal coupling. Parallel use is strongly discouraged due to mismatched Zener knee characteristics, which cause current hogging and thermal runaway - even with same part numbers, unit-to-unit VZ variation (±2 %) prevents stable current division.
How does the 50 µA test current affect circuit design?
The 50 µA test current defines the operating point where VZ and tolerance are guaranteed. Designers must ensure minimum bias current ≥50 µA across temperature and input voltage extremes. Below this, regulation degrades rapidly; above it, differential resistance improves but power dissipation rises - requiring thermal validation per the 300 mW limit and 415 K/W Rth(j-a).
Is BZX38450-B27X suitable for automotive applications?
No - BZX38450-B27X is not AEC-Q200 qualified and lacks automotive-grade screening, extended temperature validation, or failure-in-time (FIT) data. While it functions electrically in 12 V systems, Nexperia explicitly states non-automotive qualification in its legal disclaimers. For automotive use, select AEC-Q200-compliant alternatives such as PZUX27 or BZX84-C27VL.
BZX38450-B27X 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):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 20.4 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-B27X FAQ
1.How can I place an order for BZX38450-B27X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B27X 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-B27X reliable?
The price and inventory of BZX38450-B27X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B27X is usually 5 days.
3.What payment methods are accepted for BZX38450-B27X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B27X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B27X?
BZX38450-B27X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B27X 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-B27X?
For technical support, including BZX38450-B27X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B27X requirements.
6.How does Aetrix verify that BZX38450-B27X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B27X 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-B27X meets industry standards.
7.What is the process for return or replacement of BZX38450-B27X?
All BZX38450-B27X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B27X, 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-B27X part is unused and in its original packaging.
Return procedure for BZX38450-B27X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B27X 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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