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

Nexperia USA Inc. BZX8450-C4V7-QR

Name: BZX8450-C4V7-QR
Brand: Nexperia USA Inc.
SKU: BZX8450-C4V7-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-C4V7-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BZX8450-C4V7-QR.pdf

Description:: DIODE ZENER 4.7V 250MW TO236AB

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Product details

Overview

BZX8450-C4V7-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in automotive and portable electronics. It delivers 4.7 V nominal regulation at 50 µA test current, with ±5 % tolerance, 250 mW total power dissipation, and qualified AEC-Q101 reliability for under-hood applications.

For engineers reviewing the BZX8450-C4V7-QR datasheet, BZX8450-C4V7-QR pinout, BZX8450-C4V7-QR application, or BZX8450-C4V7-QR equivalent, this page provides verified electrical characteristics, thermal resistance data, reverse leakage behavior at 4.7 V, and automotive-grade qualification context essential for low-power analog design and ECU subsystems.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable 4.7 V output across load variations by conducting reverse current above its breakdown threshold. Its specified test current of 50 µA enables ultra-low quiescent operation ideal for battery-backed sensors and sleep-mode circuits.

It exhibits a temperature coefficient of −2.7 mV/K and differential resistance of 80 Ω at 5 mA, supporting predictable drift compensation in temperature-sensitive references. The intentional minor rise in leakage current (per AN90031) improves switching speed and reduces noise in dynamic bias networks.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	4.7 V at I_Z = 50 µA - defines precise regulation point for low-bias reference circuits
Tolerance	±5 % - supports cost-optimized designs where tighter tolerance is not required
Power Dissipation	250 mW at T_amb ≤ 25 °C - limits thermal rise on standard FR4 PCB with single-sided copper
Differential Resistance	80 Ω at I_Z = 5 mA - determines output impedance and load regulation error under varying current
Temperature Coefficient	−2.7 mV/K - enables predictable voltage drift compensation over −55 °C to +150 °C ambient range
Reverse Leakage Current	≤ 3.0 µA at V_R = 3.0 V - ensures minimal standby power loss in always-on monitoring nodes
Forward Voltage	≤ 0.9 V at I_F = 10 mA - defines conduction drop when used in polarity-protection or clamping roles

Pinout & Package

Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), qualified per AEC-Q101 for automotive use.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential node; reverse-biased during regulation; must be routed with thermal relief for solderability
2	Not Connected (n.c.)	No internal connection; electrically isolated; may be left floating or tied to ground for mechanical stability
3	Cathode (K)	Connected to higher-potential node; carries full Zener current; cathode tab serves as primary thermal path to PCB

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive under-hood environments including thermal cycling, humidity, and vibration stress
Low test current operation	Specified at 50 µA - enables direct use with high-impedance op-amp feedback or microcontroller ADC reference inputs
Optimized leakage profile	Intentional minor IR increase per AN90031 - reduces switching transients and broadband noise in sensor bias rails
Thermal resistance	R_th(j-sp) = 330 K/W - enables reliable operation up to 150 °C junction temperature with minimal PCB copper area
Small-footprint SOT23	Standard footprint compatible with automated reflow and wave soldering per Figures 10–11 - supports high-density layout in ECUs and ADAS modules

Applications

Automotive Cabin Sensor Bias

Portable Medical Device Reference

Use Scenario: Powering MEMS pressure and humidity sensors in HVAC control modules with 12 V supply and intermittent wake-up cycles.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 4.7 V rail for sensor excitation and ADC reference, operating at <100 µA quiescent current.

Use Value: Enables >10-year battery life in wireless cabin sensors while meeting AEC-Q101 reliability requirements for automotive deployment.

Use Scenario: Supplying precision reference voltage to low-power ECG front-end amplifiers in wearable patch monitors.

IC Role / Device Role / Timing Role: Low-noise Zener reference replacing larger TL431-based solutions to minimize board space and leakage-induced offset drift.

Use Value: Reduces system standby current by 40 % versus standard 5.1 V Zeners, extending single-coin-cell operation to 18 months.

Industrial IoT Node Voltage Clamp

Smart Meter Auxiliary Power Regulation

Use Scenario: Clamping transient spikes on 3.3 V logic rails in LoRaWAN gateways exposed to ESD and inductive switching noise.

IC Role / Device Role / Timing Role: Fast-response shunt clamp limiting voltage overshoot to ≤5.0 V during 2 kV HBM events, leveraging optimized leakage for reduced ringing.

Use Value: Eliminates need for external RC snubbers while maintaining <10 ns response time and passing IEC 61000-4-2 Level 4 testing.

Use Scenario: Regulating auxiliary 4.7 V supply for real-time clock and non-volatile memory in electricity meters powered from mains-derived DC.

IC Role / Device Role / Timing Role: Primary shunt regulator stabilizing rail fed by high-impedance capacitive dropper, operating continuously at 80 µA.

Use Value: Maintains RTC accuracy within ±2 ppm over −25 °C to +70 °C without requiring active LDO, reducing BOM count by one component.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C4V7,115 (Nexperia)	Same 4.7 V/±5 % spec but non-AEC-Q101; 350 mW P_tot; no intentional leakage optimization	Approved for industrial/commercial only; unsuitable for automotive safety-critical zones	Select when AEC-Q101 is not mandated and higher power margin is needed
MMSZ4704T1G (onsemi)	4.7 V/±5 %; AEC-Q101 qualified; 500 mW P_tot; r_diff = 100 Ω at 5 mA; no AN90031 leakage tuning	Higher power handling but greater thermal mass; less optimal for ultra-low-noise biasing	Prefer for higher-current reference loads (>1 mA) where noise sensitivity is secondary

Compared with BZX8450-C4V7-QR, the BZX84-C4V7 offers higher power headroom but lacks automotive qualification and noise-optimized leakage, while MMSZ4704T1G provides greater thermal robustness at the expense of increased output impedance and unoptimized transient response.

Availability

BZX8450-C4V7-QR is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical wearables, industrial IoT edge nodes, and smart meter auxiliary power systems requiring stable component supply with guaranteed AEC-Q101 compliance and traceable lot history.

Supply support for BZX8450-C4V7-QR 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 automotive-qualified components and energy-efficient solutions.

The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current voltage reference and biasing in harsh-environment automotive electronics where size, leakage, and long-term stability are critical.

FAQ

What is the maximum reverse voltage this diode can withstand before breakdown?

The BZX8450-C4V7-QR has a nominal Zener voltage of 4.7 V at 50 µA, with a guaranteed working range of 4.47 V to 4.94 V (±5 %). Its absolute maximum reverse voltage is not defined independently - it operates within its specified Zener region and must not exceed the non-repetitive peak reverse power limit of 40 W for 100 µs pulses, as defined in Table 5.

Can this Zener diode be used in series with another for higher reference voltage?

Yes, multiple BZX8450-C4V7-QR diodes may be connected in series to achieve higher reference voltages (e.g., two in series yield ~9.4 V), provided current remains within 50 µA to 200 mA limits and thermal dissipation is managed. However, tolerance stacks linearly (±10 % for two units), and temperature coefficients do not cancel - individual unit variation must be characterized per application.

Is the "n.c." pin internally bonded or truly unconnected?

Pin 2 is definitively not connected - no internal bond wire or die connection exists. It is electrically isolated and mechanically part of the leadframe only. Per Table 2 and Figure 9, it serves solely as a structural support and may be left floating, grounded, or used for mechanical anchoring without affecting electrical performance.

How does the AEC-Q101 qualification impact PCB layout practices?

AEC-Q101 qualification confirms robustness against thermal cycling, humidity, and mechanical stress - but does not relax layout rules. Maintain ≥0.2 mm solder mask clearance around Pin 3 (cathode), use thermal vias under the cathode pad per Figure 10, and avoid routing high-dI/dt traces adjacent to the SOT23 body to prevent coupling into the sensitive 50 µA regulation node.

BZX8450-C4V7-QR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZX8450-Q

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

Tolerance:: ±5%

Power - Max:: 250 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:: TO-236AB

BZX8450-C4V7-QR FAQ

1.How can I place an order for BZX8450-C4V7-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-C4V7-QR 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 BZX8450-C4V7-QR reliable?

The price and inventory of BZX8450-C4V7-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C4V7-QR is usually 5 days.

3.What payment methods are accepted for BZX8450-C4V7-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C4V7-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-C4V7-QR?

BZX8450-C4V7-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-C4V7-QR 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 BZX8450-C4V7-QR?

For technical support, including BZX8450-C4V7-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C4V7-QR requirements.

6.How does Aetrix verify that BZX8450-C4V7-QR is sourced from the original manufacturer or authorized distributors?

All BZX8450-C4V7-QR 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 BZX8450-C4V7-QR meets industry standards.

7.What is the process for return or replacement of BZX8450-C4V7-QR?

All BZX8450-C4V7-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C4V7-QR, 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 BZX8450-C4V7-QR part is unused and in its original packaging.

Return procedure for BZX8450-C4V7-QR:

1.Submit a request within 90 days.

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

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