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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. BZX38450-C4V7-QX

Name: BZX38450-C4V7-QX
Brand: Nexperia USA Inc.
SKU: BZX38450-C4V7-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX38450-C4V7-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: BZX38450-C4V7-QX.pdf

Description:: DIODE ZENER 4.7V 300MW SOD323

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Product details

Overview

BZX38450-C4V7-Q from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision voltage reference and regulation at 4.7 V nominal with ±5 % tolerance. It delivers 600 Ω differential resistance at I_Z = 50 µA, −2.7 mV/K temperature coefficient, and 140 pF capacitance at 1 MHz, enabling stable biasing in automotive sensor interfaces and portable battery-powered circuits.

For engineers reviewing the BZX38450-C4V7-Q datasheet, BZX38450-C4V7-Q pinout, BZX38450-C4V7-Q application, or BZX38450-C4V7-Q equivalent, key selection criteria include its AEC-Q101 qualification, 300 mW power dissipation limit, 4.47–4.94 V working voltage range at I_Z = 5 mA, and cathode/anode terminal configuration optimized for low-leakage, noise-sensitive regulation.

Technical Context

This Zener diode operates in reverse breakdown mode with specified regulation at low test current (50 µA), making it suitable for ultra-low-power bias networks where quiescent current must remain below 100 µA. Its intentional minor leakage rise improves switching speed and reduces noise in signal conditioning paths.

The device features a negative temperature coefficient of −2.7 mV/K and exhibits 140 pF junction capacitance at VR = 0 V and f = 1 MHz, supporting stable DC reference generation while minimizing AC coupling effects in mixed-signal subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	4.7 V (range 4.47–4.94 V at I_Z = 5 mA); defines precise DC reference level for analog front-ends
Tolerance	±5 % (C-series); enables cost-optimized selection where tight regulation is not required
Differential Resistance	600 Ω at I_Z = 50 µA; ensures minimal voltage shift under light load variations
Temperature Coefficient	−2.7 mV/K; provides predictable, linear drift for thermal compensation design
Junction Capacitance	140 pF at f = 1 MHz, VR = 0 V; limits high-frequency noise coupling in sensitive analog nodes
Forward Voltage	≤ 0.9 V at I_F = 10 mA; supports use as clamping diode in bidirectional protection schemes
Total Power Dissipation	300 mW at T_amb ≤ 25 °C on FR4 PCB; sets maximum continuous DC power handling in compact layouts

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 PCB mounting.

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; completes reverse-bias path for Zener conduction

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness
Low test current operation	Specified at 50 µA - enables use in microamp-level bias networks without compromising regulation accuracy
Optimized leakage profile	Intentional minor IR rise reduces switching transients and broadband noise in sensor signal chains
Thermal resistance	R_th(j-a) = 415 K/W - informs derating requirements for ambient temperatures above 25 °C

Applications

Automotive Cabin Sensors

Portable Medical Monitors

Use Scenario: Voltage reference for MEMS pressure and humidity sensors in HVAC control modules.

IC Role / Device Role / Timing Role: Zener regulator providing stable 4.7 V bias to ADC reference input and op-amp rails.

Use Value: AEC-Q101 qualification ensures long-term stability across −40 °C to +125 °C ambient, while 140 pF capacitance avoids signal integrity degradation at sensor bandwidths up to 10 kHz.

Use Scenario: Low-power voltage reference in wearable ECG front-end circuitry powered by coin-cell batteries.

IC Role / Device Role / Timing Role: Precision shunt regulator maintaining 4.7 V for analog signal chain biasing under sub-100 µA total system current.

Use Value: 50 µA test current specification allows accurate regulation without draining battery life; ±5 % tolerance accommodates cost-sensitive clinical-grade accuracy requirements.

Industrial IoT Edge Nodes

Smart Meter Reference Subsystems

Use Scenario: Reference source for isolated RS-485 transceiver bias in battery-backed remote telemetry units.

IC Role / Device Role / Timing Role: Shunt regulator stabilizing local 4.7 V rail for digital isolator and level-shifter ICs.

Use Value: 300 mW power rating supports transient surge immunity during hot-plug events; SOD323 footprint enables high-density layout in space-constrained enclosures.

Use Scenario: Secondary voltage reference in polyphase electricity meters requiring redundancy against primary supply failure.

IC Role / Device Role / Timing Role: Standby Zener regulator activated during main supply brownout to sustain RTC and memory backup rails.

Use Value: −2.7 mV/K temperature coefficient enables predictable drift compensation across meter operating range (−25 °C to +70 °C), improving long-term metrology accuracy.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX384-B4V7-Q	±2 % tolerance, 80 Ω r_diff at I_Z = 5 mA, −2.7 mV/K TC	Higher precision and lower dynamic impedance; suited for feedback loops demanding tighter regulation	Select when voltage stability under varying load is critical and cost premium is acceptable
MMSZ4704T1G	±5 % tolerance, 100 Ω r_diff at I_Z = 5 mA, −2.5 mV/K TC, SOD-123 package	Larger footprint (2.7 mm × 1.6 mm), higher thermal resistance (500 K/W), non-AEC-Q101	Choose only for non-automotive industrial use where board space and qualification are secondary

Compared with BZX38450-C4V7-Q, the BZX384-B4V7-Q offers superior regulation accuracy and lower impedance but lacks the intentional leakage optimization for noise reduction; the MMSZ4704T1G provides similar voltage spec but fails AEC-Q101 compliance and occupies 2.5× more PCB area, limiting suitability for automotive or space-constrained designs.

Availability

BZX38450-C4V7-Q is available at Aetrix Electronics and suitable for automotive cabin electronics, portable medical instrumentation, and industrial IoT edge nodes requiring stable component supply with guaranteed AEC-Q101 conformance and traceable sourcing.

Supply support for BZX38450-C4V7-Q 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 devices, with leadership in automotive-qualified components and efficient manufacturing.

The BZX38450-Q series belongs to Nexperia's automotive Zener portfolio, engineered specifically for low-current, noise-sensitive voltage reference applications in harsh-environment automotive subsystems.

FAQ

What is the maximum reverse current at 4.7 V for BZX38450-C4V7-Q?

At V_R = 4.7 V and T_j = 25 °C, the typical reverse current is 5.0 µA. The datasheet specifies a maximum of 5.0 µA at I_Z = 5 mA, confirming stable regulation onset within the nominal Zener voltage band without excessive leakage.

Can BZX38450-C4V7-Q be used in forward conduction mode?

Yes - its forward voltage is rated ≤ 0.9 V at I_F = 10 mA, making it suitable for low-drop clamping or polarity protection functions. However, its primary design intent and characterization are for reverse-bias Zener operation, and forward SOA is limited to 250 mA peak per absolute maximum ratings.

How does the "C" suffix affect performance versus "B" variants?

The "C" suffix denotes ±5 % tolerance and an intentionally elevated leakage current profile optimized for faster switching and reduced noise in signal-path applications. In contrast, "B" variants offer ±2 % tolerance and lower leakage, prioritizing regulation precision over dynamic behavior.

Is thermal derating required above 25 °C ambient?

Yes - with R_th(j-a) = 415 K/W, power dissipation must be linearly derated above 25 °C. At 85 °C ambient, maximum allowable P_tot drops to approximately 170 mW to maintain T_j ≤ 150 °C, per the junction temperature limit in Table 5.

BZX38450-C4V7-QX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZX38450-Q

Package/Case:: SC-76, SOD-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 4.7 V

Tolerance:: ±5%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 3 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -55°C ~ 150°C (TA)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-323

BZX38450-C4V7-QX FAQ

1.How can I place an order for BZX38450-C4V7-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX38450-C4V7-QX 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-C4V7-QX reliable?

The price and inventory of BZX38450-C4V7-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C4V7-QX is usually 5 days.

3.What payment methods are accepted for BZX38450-C4V7-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C4V7-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX38450-C4V7-QX?

BZX38450-C4V7-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX38450-C4V7-QX 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-C4V7-QX?

For technical support, including BZX38450-C4V7-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C4V7-QX requirements.

6.How does Aetrix verify that BZX38450-C4V7-QX is sourced from the original manufacturer or authorized distributors?

All BZX38450-C4V7-QX 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-C4V7-QX meets industry standards.

7.What is the process for return or replacement of BZX38450-C4V7-QX?

All BZX38450-C4V7-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C4V7-QX, 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-C4V7-QX part is unused and in its original packaging.

Return procedure for BZX38450-C4V7-QX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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