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

Nexperia USA Inc. BZX8450-B27-QR

Name: BZX8450-B27-QR
Brand: Nexperia USA Inc.
SKU: BZX8450-B27-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-B27-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-B27-QR.pdf

Description:: DIODE ZENER 27V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:5,291

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Product details

Overview

BZX8450-B27-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 27 V nominal regulation at 50 µA test current, with ±2 % tolerance, 250 mW total power dissipation, and qualified AEC-Q101 reliability for under-hood applications.

For engineers reviewing the BZX8450-B27-QR datasheet, BZX8450-B27-QR pinout, BZX8450-B27-QR application, or BZX8450-B27-QR equivalent, this page provides verified electrical characteristics, thermal resistance data, leakage behavior, differential resistance, and automotive-grade qualification context to support low-power analog design and supply rail stabilization.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable reverse breakdown voltage across its cathode-anode terminals. Its specified 27 V nominal Zener voltage (B-series ±2 %) is measured at I_Z = 50 µA - enabling ultra-low quiescent current operation ideal for battery-backed circuits and sensor bias networks.

The BZX8450-B27-QR exhibits 300 Ω typical differential resistance at I_Z = 5 mA and a positive temperature coefficient of +20.4 mV/K, ensuring predictable voltage drift over temperature. Its non-repetitive peak reverse power capability reaches 40 W for 100 µs pulses, supporting transient suppression in conjunction with series impedance.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	27 V at I_Z = 50 µA; enables precise low-current reference generation
Tolerance	±2 % (B-series); supports tight voltage margining in safety-critical automotive subsystems
Differential Resistance	300 Ω max at I_Z = 5 mA; defines output impedance and load regulation sensitivity
Forward Voltage	0.9 V max at I_F = 10 mA; ensures minimal forward conduction loss during polarity reversal
Total Power Dissipation	250 mW at T_amb ≤ 25 °C on FR4 PCB; sets maximum continuous DC power handling
Junction Temperature	−55 °C to +150 °C; supports operation in engine control units and ADAS modules
AEC-Q101 Qualified	Stress-tested per automotive discrete semiconductor standard; validated for under-hood deployment

Pinout & Package

SOT23 plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body, tin-plated copper leads.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connects to lower-potential node; reverse-biased during regulation
2	Not Connected (n.c.)	Internally unconnected; no PCB trace or routing required
3	Cathode (K)	Connects to higher-potential node; carries regulated current to ground or return path

Key Features

Feature	Design Value
Low test current operation	Specified at 50 µA - reduces standby power in always-on vehicle modules
Automotive qualification	AEC-Q101 compliant - eliminates need for additional qualification testing in Tier-1 designs
Controlled leakage profile	Intentional minor rise in IR supports faster switching and lower noise in feedback loops
Thermal resistance	R_th(j-a) = 500 K/W (free air); informs derating curves for high-temperature mounting

Applications

Engine Control Unit (ECU) Sensor Biasing

Automotive Infotainment Power Sequencing

Use Scenario: Providing stable 27 V reference for analog front-end amplifiers in knock sensor signal conditioning circuits.

IC Role / Device Role / Timing Role: Shunt voltage reference regulating bias current to op-amp input stages under varying battery voltage (9–16 V).

Use Value: ±2 % tolerance and low 50 µA test current ensure consistent gain calibration across temperature and lifetime without loading the microcontroller's LDO.

Use Scenario: Enabling controlled power-up sequencing of display backlight drivers and audio codecs via voltage-dependent enable logic.

IC Role / Device Role / Timing Role: Zener clamp defining threshold for comparator-based power-good detection in multi-rail PMIC systems.

Use Value: 27 V breakdown with 300 Ω r_diff yields sharp transition edge for reliable timing margin in 12 V auxiliary rail monitoring.

ADAS Camera Module Reference

Electric Power Steering (EPS) Feedback Circuit

Use Scenario: Supplying accurate bias to CMOS image sensor analog blocks operating from a switched 24 V bus.

IC Role / Device Role / Timing Role: Low-noise voltage reference stabilizing pixel reset levels and column amplifier offsets.

Use Value: Optimized leakage profile minimizes shot noise contribution, preserving SNR in low-light imaging conditions.

Use Scenario: Generating fixed reference for torque sensor bridge excitation in closed-loop motor control feedback paths.

IC Role / Device Role / Timing Role: Precision shunt regulator establishing stable 27 V excitation voltage independent of battery sag during motor startup.

Use Value: AEC-Q101 qualification and 150 °C junction rating ensure uninterrupted operation during EPS thermal transients.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C27-Q	±5 % tolerance, higher leakage at VR < 25 V, 300 Ω r_diff at I_Z = 2 mA	Less stringent voltage accuracy; suitable for non-critical bias where cost is prioritized	Select when ±5 % regulation tolerance is acceptable and AEC-Q101 is not mandatory
MMSZ5254B-TP	27 V ±5 %, 500 mW P_tot, SOD-123 package, no AEC-Q101 qualification	Higher power rating but larger footprint and no automotive qualification	Choose only for non-automotive industrial use requiring higher continuous dissipation

Compared with BZX8450-B27-QR, the BZX84-C27-Q trades tighter tolerance and automotive qualification for lower unit cost, while MMSZ5254B-TP offers higher power handling in a different package but lacks AEC-Q101 validation and introduces layout compatibility constraints.

Availability

BZX8450-B27-QR is available at Aetrix Electronics and suitable for automotive ECU sensor biasing, ADAS camera reference generation, and electric power steering feedback circuits requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZX8450-B27-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 essential efficiency-enhancing components, delivering high-performance, reliable, and scalable solutions for automotive, industrial, and consumer markets.

The BZX8450-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for low-current voltage reference and regulation in harsh-environment electronic control units where precision, stability, and qualification integrity are critical.

FAQ

What is the maximum reverse voltage before breakdown for BZX8450-B27-QR?

The nominal Zener voltage is 27 V with ±2 % tolerance, meaning guaranteed breakdown occurs between 26.46 V and 27.54 V at I_Z = 50 µA. The absolute maximum non-repetitive peak reverse voltage is limited by P_ZSM = 40 W for 100 µs pulses - translating to ~126 V at 316 mA surge, but sustained operation must remain within the 27 V regulation band.

Does BZX8450-B27-QR have a connected pin 2, and what happens if it's soldered?

No - pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia pinning diagram and package outline. It is internally unconnected; soldering or routing to pin 2 has no electrical effect but may risk mechanical stress or solder bridging. PCB layout should omit copper for pin 2 per recommended SOT23 footprint.

How does the BZX8450-B27-QR's temperature coefficient affect regulation accuracy over −40 °C to +125 °C?

With a specified temperature coefficient of +20.4 mV/K, the Zener voltage increases by approximately 3.3 V across a 165 K range (−40 °C to +125 °C). This results in a total shift from ~25.4 V to ~28.7 V - a ±6.1 % deviation. Designers must account for this drift in closed-loop references or pair with compensating circuitry for high-accuracy applications.

Can BZX8450-B27-QR be used in place of a 27 V Zener diode without AEC-Q101 qualification?

Yes - its electrical parameters (27 V ±2 %, 250 mW, SOT23) match common industrial Zeners, but its AEC-Q101 qualification adds value only in automotive contexts. In non-automotive applications, it functions identically to non-qualified equivalents, though its tighter tolerance and optimized leakage may improve performance in low-noise or low-power designs.

BZX8450-B27-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):: 27 V

Tolerance:: ±2%

Power - Max:: 250 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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BZX8450-B27-QR FAQ

1.How can I place an order for BZX8450-B27-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-B27-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-B27-QR reliable?

The price and inventory of BZX8450-B27-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-B27-QR is usually 5 days.

3.What payment methods are accepted for BZX8450-B27-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B27-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-B27-QR?

BZX8450-B27-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-B27-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-B27-QR?

For technical support, including BZX8450-B27-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B27-QR requirements.

6.How does Aetrix verify that BZX8450-B27-QR is sourced from the original manufacturer or authorized distributors?

All BZX8450-B27-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-B27-QR meets industry standards.

7.What is the process for return or replacement of BZX8450-B27-QR?

All BZX8450-B27-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B27-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-B27-QR part is unused and in its original packaging.

Return procedure for BZX8450-B27-QR:

1.Submit a request within 90 days.

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

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