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Nexperia USA Inc. BZX38450-B5V1X
- Part No.:
- BZX38450-B5V1X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B5V1X.pdf
- Description:
- DIODE ZENER 5.1V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,726
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Product details
Overview
BZX38450-B5V1X 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 5.1 V regulation at 50 µA test current, with ±2 % tolerance, 500 Ω differential resistance at 5 mA, and 300 mW total power dissipation - optimized for portable battery-powered systems requiring stable low-current references.
For engineers reviewing the BZX38450-B5V1X datasheet, BZX38450-B5V1X pinout, BZX38450-B5V1X application, or BZX38450-B5V1X equivalent, key selection criteria include its 50 µA regulation point, low leakage (<0.05 µA at VR = 5.1 V), thermal coefficient of −2.0 mV/K, and compatibility with FR4 PCBs using standard SOD323 reflow footprints.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 5.00 V to 5.20 V at IZ = 50 µA, and maintains regulation across 1 mA to 5 mA test currents. Its differential resistance drops from 600 Ω at 1 mA to 500 Ω at 5 mA, indicating improved dynamic regulation under moderate bias.
The device exhibits a negative temperature coefficient of −2.0 mV/K, ensuring predictable drift over temperature, and features low junction-to-ambient thermal resistance (415 K/W) when mounted on standard FR4 PCBs - critical for thermal stability in compact, unheatsinked layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 5.1 V at IZ = 50 µA - defines primary regulation point for low-bias reference circuits |
| Voltage Tolerance | ±2 % - ensures tight output accuracy without post-calibration in portable sensor nodes |
| Differential Resistance | 500 Ω at IZ = 5 mA - determines load regulation error under 1 mA output variation |
| Forward Voltage | 0.9 V at IF = 10 mA - enables use as polarity-sensitive clamp or dual-purpose protection/reference |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power in standard PCB layout |
| Reverse Leakage Current | <0.05 µA at VR = 5.1 V - minimizes quiescent current drain in battery-critical applications |
| Temperature Coefficient | −2.0 mV/K - quantifies voltage drift per degree Celsius for ambient-compensated designs |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package; 2-pin, 1.3 mm pitch, 1.7 mm × 1.25 mm × 0.95 mm body; 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 - reverse-biased during regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables stable reference generation in microamp-level supply rails |
| Tight voltage tolerance | ±2 % - reduces need for trimming resistors in precision analog front-ends |
| Optimized thermal performance | Rth(j-a) = 415 K/W on FR4 - supports reliable operation without heatsinking in space-constrained layouts |
| Controlled leakage behavior | IR < 0.05 µA at VR = 5.1 V - preserves battery life in always-on IoT endpoints |
| Standardized SMD footprint | SOD323 outline per Fig. 9 - ensures compatibility with automated placement and reflow processes |
Applications
| Portable Sensor Reference | Low-Power Microcontroller Reset |
|---|---|
|
Use Scenario: Providing stable 5.1 V reference for ADCs in battery-powered environmental sensors. IC Role / Device Role / Timing Role: Zener voltage reference diode operating in reverse breakdown at 50 µA bias. Use Value: Enables <1 µA total reference circuit current while maintaining ±2 % accuracy across −40 °C to +85 °C. |
Use Scenario: Generating clean reset threshold for ultra-low-power MCUs in wearables. IC Role / Device Role / Timing Role: Precision voltage detection element in RC-based reset generator. Use Value: Delivers repeatable 5.1 V trip point with <0.05 µA leakage, minimizing standby current impact. |
| RF Front-End Biasing | USB-C Power Negotiation Clamp |
|
Use Scenario: Setting gate bias for low-noise LNA transistors in sub-GHz ISM band receivers. IC Role / Device Role / Timing Role: Low-noise DC bias source replacing higher-current shunt regulators. Use Value: Reduces system noise floor via intentional minor leakage optimization per AN90031. |
Use Scenario: Clamping CC line voltage during USB-C PD communication handshake. IC Role / Device Role / Timing Role: Overvoltage protection and level-setting diode on 5 V negotiation bus. Use Value: Limits CC line to 5.1 V with 0.9 V forward drop, preventing false PD contract termination. |
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-C5V1 | ±5 % tolerance vs. ±2 %; identical 5.1 V nominal, same SOD323 package | Acceptable where cost sensitivity outweighs accuracy requirements | Select for non-critical biasing where 5 % variation is within system margin |
| MMSZ5231B | Same 5.1 V nominal but ±5 % tolerance; 500 mW rating; SOD-123 package (larger footprint) | Requires PCB layout change; higher thermal resistance (500 K/W) | Choose only if legacy SOD-123 footprint must be retained and tighter tolerance is not required |
Compared with BZX38450-C5V1 and MMSZ5231B, the BZX38450-B5V1X provides superior voltage accuracy (±2 %) and lower thermal resistance (415 K/W) in the smaller SOD323 footprint - making it optimal for next-generation space- and power-constrained designs demanding precision.
Availability
BZX38450-B5V1X is available at Aetrix Electronics and suitable for portable sensor reference, low-power microcontroller reset, and RF front-end biasing requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX38450-B5V1X 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 battery-powered and space-constrained applications where regulation accuracy, ultra-low leakage, and SMD manufacturability are critical.
FAQ
What is the maximum continuous reverse power dissipation for BZX38450-B5V1X?
The BZX38450-B5V1X has a total power dissipation limit of 300 mW at ambient temperatures ≤25 °C when mounted on a standard FR4 PCB with single-sided copper. This rating assumes no forced airflow or heatsinking and decreases linearly above 25 °C per the device's thermal resistance of 415 K/W.
Does BZX38450-B5V1X support bidirectional ESD protection?
No - BZX38450-B5V1X is a unidirectional Zener diode optimized for reverse-bias voltage regulation. Its forward voltage is 0.9 V at 10 mA, but it lacks symmetric clamping characteristics or specified ESD ratings (e.g., IEC 61000-4-2). For bidirectional protection, dedicated TVS diodes such as PESD5V0S1BA should be used.
Can BZX38450-B5V1X be used in series for higher voltage references?
Yes - multiple BZX38450-B5V1X diodes may be connected in series to achieve higher reference voltages (e.g., two in series ≈10.2 V), provided current remains within 50 µA–5 mA range and power derating accounts for cumulative dissipation. However, tolerance stacks (±4 % for two units), and thermal tracking between devices must be evaluated for precision applications.
Is the cathode marking consistent across all BZX38450-B5V1X production lots?
Yes - per datasheet section 5 and Figure 9, the cathode is always indicated by a bar marking on the top surface adjacent to pin 1. This marking is laser-etched or molded into the SOD323 package and verified per AEC-Q200-aligned process controls; no lot-dependent variation exists in polarity identification.
BZX38450-B5V1X 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):
- 5.1 V
- Tolerance:
- ±2%
- 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-B5V1X FAQ
1.How can I place an order for BZX38450-B5V1X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B5V1X 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-B5V1X reliable?
The price and inventory of BZX38450-B5V1X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B5V1X is usually 5 days.
3.What payment methods are accepted for BZX38450-B5V1X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B5V1X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B5V1X?
BZX38450-B5V1X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B5V1X 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-B5V1X?
For technical support, including BZX38450-B5V1X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B5V1X requirements.
6.How does Aetrix verify that BZX38450-B5V1X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B5V1X 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-B5V1X meets industry standards.
7.What is the process for return or replacement of BZX38450-B5V1X?
All BZX38450-B5V1X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B5V1X, 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-B5V1X part is unused and in its original packaging.
Return procedure for BZX38450-B5V1X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B5V1X Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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