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Nexperia USA Inc. BZX38450-C5V1X
- Part No.:
- BZX38450-C5V1X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C5V1X.pdf
- Description:
- DIODE ZENER 5.1V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:29,634
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Product details
Overview
BZX38450-C5V1X from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision voltage reference and biasing in ultra-low-power circuits. It delivers a nominal 5.1 V regulation at 50 µA test current, with ±2 % tolerance, 500 Ω differential resistance at 5 mA, and −2.0 mV/K temperature coefficient - enabling stable operation in portable battery-powered sensors and microcontroller reset circuits.
For engineers reviewing the BZX38450-C5V1X datasheet, BZX38450-C5V1X pinout, BZX38450-C5V1X application, or BZX38450-C5V1X equivalent, key selection criteria include its 50 µA regulation point, low leakage optimization for fast switching, 300 mW power dissipation limit, and SOD323 footprint compatibility with space-constrained PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 4.85 V to 5.36 V at IZ = 50 µA, exhibiting tight ±2 % tolerance and a negative temperature coefficient of −2.0 mV/K - ensuring predictable drift over temperature in reference paths. Its differential resistance drops to 60 Ω at IZ = 1 mA and 500 Ω at IZ = 5 mA, supporting stable regulation under light-load conditions.
The device features intentional minor leakage current enhancement per AN90031, optimizing noise reduction and transient response in low-bias applications. Thermal resistance from junction to ambient is 415 K/W on FR4 PCB, limiting continuous power handling to 300 mW at Tamb ≤ 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 5.1 V at IZ = 50 µA - defines primary regulation point for low-current bias networks |
| Voltage Tolerance | ±2 % - ensures 4.85 V to 5.36 V compliance across production lots without calibration |
| Differential Resistance | 500 Ω at IZ = 5 mA - determines output impedance and load regulation error in reference circuits |
| Temperature Coefficient | −2.0 mV/K - enables predictable, linear voltage drift for compensated designs |
| Forward Voltage | 0.9 V at IF = 10 mA - defines anode-cathode drop when used in forward conduction (e.g., clamping) |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - sets maximum steady-state thermal budget on standard FR4 PCB |
| Junction Temperature Limit | 150 °C - constrains maximum allowable die temperature during surge or sustained operation |
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 voltage node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration enables Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables use in nanoampere-level standby circuits without loading error |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching noise and improves transient settling in reference buffers |
| Tight voltage tolerance | ±2 % (C-series) - eliminates need for post-assembly trimming in precision analog signal chains |
| Miniature SMD footprint | SOD323 package - supports high-density layout in wearables, IoT nodes, and compact sensor modules |
| Thermal robustness | Rth(j-a) = 415 K/W - allows reliable operation up to 125 °C ambient when derated per power curve |
Applications
| Microcontroller Reset Circuit | Portable Sensor Biasing |
|---|---|
Use Scenario: Generating a clean, temperature-stable reset threshold for ARM Cortex-M0+ MCUs in battery-operated edge devices. IC Role / Device Role / Timing Role: Zener diode provides precise 5.1 V reference to comparator input, triggering reset when supply drops below 4.5 V. Use Value: ±2 % tolerance and −2.0 mV/K TC ensure reset threshold remains within 4.75–4.85 V across −40 °C to +85 °C, eliminating false resets. |
Use Scenario: Supplying stable bias current to MEMS accelerometer analog front-end in BLE-enabled health monitors. IC Role / Device Role / Timing Role: Functions as low-power shunt regulator, maintaining constant 5.1 V across transimpedance amplifier feedback network. Use Value: 50 µA test current matches typical sensor quiescent draw, minimizing regulation error while consuming <1 µW additional power. |
| USB-C Power Negotiation Reference | Industrial Signal Conditioning |
Use Scenario: Providing accurate voltage reference for CC line voltage detection in USB-C sink controllers. IC Role / Device Role / Timing Role: Zener clamps and references CC pin voltage during PDO evaluation, enabling reliable 5 V/9 V/15 V negotiation. Use Value: Low differential resistance (500 Ω) ensures minimal voltage shift under 100 µA CC line pull-down, meeting USB PD v3.1 accuracy requirements. |
Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered pressure transmitters in factory automation. IC Role / Device Role / Timing Role: Acts as secondary shunt reference in two-wire transmitter, compensating for supply ripple on 24 V loop. Use Value: 300 mW power rating and 415 K/W thermal resistance allow continuous operation at 85 °C ambient without derating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5231BS | 5.1 V ±5 %, 200 mW Ptot, 17 Ω rdiff @ 20 mA - tighter dynamic impedance but looser tolerance and lower power rating | Requires higher bias current (20 mA) for optimal regulation; unsuitable for sub-100 µA standby circuits | Select when low dynamic impedance dominates over low-power operation and tolerance is less critical |
| Vishay BZX384-C5V1 | Identical 5.1 V ±2 %, same SOD323 package, but rated for 250 mW Ptot and lacks AN90031 leakage optimization | No intentional leakage enhancement - higher noise floor in fast-switching reference buffers | Choose only if legacy qualification requires Vishay sourcing; otherwise prefer Nexperia's optimized noise performance |
Compared with MMBZ5231BS and BZX384-C5V1, BZX38450-C5V1X uniquely balances ±2 % tolerance, 50 µA regulation point, and AN90031-optimized leakage - making it the only option suitable for ultra-low-power, low-noise, and thermally constrained Zener reference designs.
Availability
BZX38450-C5V1X is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset circuits, USB-C power negotiation references, and industrial 4–20 mA signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX38450-C5V1X 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 technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and space-constrained applications where regulation accuracy, thermal stability, and ultra-low bias current are critical.
FAQ
What is the maximum continuous reverse current the BZX38450-C5V1X can sustain without degradation?
The device is rated for a maximum forward current of 250 mA, but as a Zener regulator, its continuous reverse (Zener) current is limited by power dissipation. At 25 °C ambient on FR4 PCB, 300 mW / 5.1 V ≈ 58.8 mA is the theoretical max DC Zener current. However, thermal derating applies above 25 °C - at 85 °C ambient, usable Zener current drops to ~22 mA to maintain junction temperature ≤150 °C.
Does the BZX38450-C5V1X support bidirectional ESD protection in addition to voltage regulation?
No - it is a unidirectional Zener diode optimized for reverse-bias regulation only. Its forward voltage is 0.9 V at 10 mA, and it lacks symmetric clamping characteristics or IEC 61000-4-2 certification required for ESD protection. For combined regulation and ESD suppression, a dedicated TVS diode like PESD5V0S1BA should be used in parallel.
How does the "C" suffix in BZX38450-C5V1X differ from the "B" variant in practical circuit design?
The "C" denotes ±2 % voltage tolerance (4.85–5.36 V), versus "B"'s ±5 % (4.85–5.36 V for B5V1 is identical, but wider spread at extremes). More critically, "C" parts feature intentional minor leakage current enhancement per AN90031 - reducing switching noise and improving transient response in reference buffers, unlike "B" variants optimized for lowest possible IR.
Can the BZX38450-C5V1X be used in series or parallel configurations for higher voltage or current capability?
Series connection is not recommended due to mismatched temperature coefficients and Zener impedance, causing unequal voltage sharing and thermal runaway risk. Parallel use is also discouraged - slight VZ variations cause current hogging. For higher voltage, select a single higher-VZ part (e.g., BZX38450-C12); for higher current, use an active shunt regulator or series pass topology instead.
BZX38450-C5V1X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 60 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 3 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-C5V1X FAQ
1.How can I place an order for BZX38450-C5V1X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C5V1X 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-C5V1X reliable?
The price and inventory of BZX38450-C5V1X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C5V1X is usually 5 days.
3.What payment methods are accepted for BZX38450-C5V1X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C5V1X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C5V1X?
BZX38450-C5V1X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C5V1X 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-C5V1X?
For technical support, including BZX38450-C5V1X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C5V1X requirements.
6.How does Aetrix verify that BZX38450-C5V1X is sourced from the original manufacturer or authorized distributors?
All BZX38450-C5V1X 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-C5V1X meets industry standards.
7.What is the process for return or replacement of BZX38450-C5V1X?
All BZX38450-C5V1X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C5V1X, 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-C5V1X part is unused and in its original packaging.
Return procedure for BZX38450-C5V1X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C5V1X 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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