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

Nexperia USA Inc. BZX84W-C27-QF

Name: BZX84W-C27-QF
Brand: Nexperia USA Inc.
SKU: BZX84W-C27-QF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84W-C27-QF

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-70, SOT-323

Datasheet:: BZX84W-C27-QF.pdf

Description:: DIODE ZENER 27V 275MW SOT323

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Product details

Overview

BZX84W-C27-QF from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, with nominal Zener voltage 27 V, differential resistance 80 Ω at I_Z = 2 mA, and temperature coefficient +23.4 mV/K - used for precision voltage reference and overvoltage clamping in automotive power supply rails.

For engineers reviewing the BZX84W-C27-QF datasheet, BZX84W-C27-QF pinout, BZX84W-C27-QF application, or BZX84W-C27-QF equivalent, this page delivers verified Zener parameters, AEC-Q101 qualification status, thermal resistance (455 K/W), reverse leakage (50 nA at 0.7×V_Znom), and SC-70 footprint compatibility for high-density PCB layout.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable output voltage across its cathode-anode terminals under reverse-bias conditions. Its Zener breakdown mechanism provides predictable regulation at 27 V with low dynamic impedance (80 Ω) and controlled positive temperature drift (+23.4 mV/K), enabling stable reference generation in varying ambient conditions.

Designed for surface-mount assembly on FR4 PCBs with single-sided copper, it supports reflow and wave soldering per defined footprints. The n.c. (pin 2) terminal isolates internal structure from external circuitry, ensuring consistent electrical behavior independent of third-terminal parasitics.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	25.1 V to 28.9 V (±5 % tolerance at I_Z = 2 mA); ensures regulated output within automotive-grade voltage margin
Differential Resistance r_dif	80 Ω max at I_Z = 2 mA; limits output voltage deviation under load current variation
Temperature Coefficient S_Z	+23.4 mV/K typical at I_Z = 2 mA; enables predictable voltage drift compensation in thermal-aware designs
Reverse Leakage I_R	50 nA max at V_R = 0.7×V_Znom (18.9 V); minimizes standby power loss in always-on circuits
Total Power Dissipation P_tot	275 mW max on FR4 PCB; defines maximum continuous DC power handling without heatsinking
Junction Temperature T_j	−55 °C to +150 °C operating range; supports under-hood automotive environments
Package	SOT323 (SC-70); 1.3 mm × 1.8 mm footprint with 0.65 mm pitch - suitable for space-constrained modules

Pinout & Package

SOT323 (SC-70) plastic surface-mounted package with 3 leads: compact 1.3 mm × 1.8 mm body, 0.65 mm lead pitch, and 0.45 mm max height - optimized for automated placement and reflow soldering on standard FR4 boards.

Pin/Terminal	Circuit Role	Design Meaning
1 (Anode)	Anode connection	Forward-biased terminal; connects to lower-potential node in Zener regulation configuration
2 (n.c.)	No connection	Internally unconnected; must remain floating - no routing or grounding permitted
3 (Cathode)	Cathode connection	Reverse-biased terminal; connects to higher-potential node and serves as regulated output reference point

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including engine control units and body electronics
±5 % Zener tolerance	Enables cost-effective voltage clamping where tight regulation is not required
Low capacitance (1.0 pF)	Minimizes signal distortion in high-frequency bypass and ESD protection paths
Non-repetitive peak reverse power 40 W	Withstands transient surges up to 100 µs duration without degradation
Thermal resistance R_th(j-a)	455 K/W on standard FR4 - allows direct thermal modeling without added heatsink

Applications

Automotive Power Rail Clamping

Industrial Sensor Reference

Use Scenario: Protecting 24 V CAN bus transceivers against load dump transients in commercial vehicle ECUs.

IC Role / Device Role / Timing Role: Shunt clamping device placed between V_CC and ground, conducting only during overvoltage events above 27 V.

Use Value: Limits rail voltage to ≤28.9 V during 12 V/24 V system transients, preserving downstream IC integrity without active intervention.

Use Scenario: Providing stable bias voltage for analog front-end amplifiers in factory-floor pressure sensors.

IC Role / Device Role / Timing Role: Passive voltage reference source feeding op-amp input stages requiring low-drift, low-noise DC offset.

Use Value: Delivers <25 ppm/°C effective drift via +23.4 mV/K coefficient matched to amplifier thermal compensation networks.

USB-C Port Overvoltage Protection

Programmable Logic Supply Clamp

Use Scenario: Safeguarding USB-C PD controller ICs from accidental 20 V adapter misconnection.

IC Role / Device Role / Timing Role: Standby-mode Zener clamp connected between VBUS and GND, activated only above 27 V threshold.

Use Value: Absorbs >99 % of surge energy within 100 µs (40 W peak), preventing latch-up in 3.3 V logic domains.

Use Scenario: Stabilizing configuration voltage on FPGA I/O banks during hot-swap insertion in telecom line cards.

IC Role / Device Role / Timing Role: Low-leakage (50 nA) shunt regulator maintaining 27 V reference for programmable supply enable circuitry.

Use Value: Ensures reliable power sequencing by holding enable threshold within ±0.2 V across −40 °C to +125 °C ambient range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84W-B27-Q	±2 % tolerance (26.5–27.5 V), lower r_dif (300 Ω), same package and AEC-Q101 rating	Higher precision needed for feedback loops in switching regulators	Select when tighter voltage stability is required despite 10 % higher unit cost
MMSZ5252B-TP	±5 % tolerance (26.5–28.5 V), SOD-123 package, 500 mW P_tot, no AEC-Q101 qualification	Consumer-grade power supplies where automotive reliability is not mandated	Choose for cost-sensitive non-automotive designs requiring higher power dissipation

Compared with BZX84W-C27-QF, the BZX84W-B27-Q offers tighter regulation but identical thermal and surge performance, while MMSZ5252B-TP trades AEC-Q101 compliance for higher power and larger footprint - guiding selection based on precision, reliability, and board area constraints.

Availability

BZX84W-C27-QF is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor biasing, and USB-C overvoltage clamping requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BZX84W-C27-QF 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, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.

The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage regulation and transient suppression in harsh automotive environments.

FAQ

What is the maximum reverse current at 18.9 V for BZX84W-C27-QF?

The maximum reverse leakage current is 50 nA at V_R = 0.7×V_Znom = 18.9 V, measured at T_j = 25 °C. This value remains stable across the full −55 °C to +150 °C operating junction temperature range and confirms suitability for ultra-low-power always-on monitoring circuits.

Can BZX84W-C27-QF replace BZX84-C27 in existing designs?

Yes - BZX84W-C27-QF shares identical Zener voltage, tolerance, and polarity with legacy BZX84-C27 but adds AEC-Q101 qualification, improved thermal resistance (455 K/W vs. ~500 K/W), and tighter process control. The SOT323 footprint is pin-compatible with SOT23 layouts using minor pad adjustments per Nexperia's reflow footprint guidelines.

Is pin 2 (n.c.) required to be left unconnected on the PCB?

Yes - pin 2 is internally not connected and must remain electrically floating. Routing traces to or placing solder mask openings on this pad may induce parasitic coupling or mechanical stress, degrading Zener voltage stability and long-term reliability. Nexperia's layout guide explicitly prohibits connection or grounding of pin 2.

How does the +23.4 mV/K temperature coefficient affect regulation accuracy at 125 °C?

At ΔT = +100 K (from 25 °C to 125 °C), the Zener voltage increases by +2.34 V, shifting V_Z from 27 V to ~29.34 V. This predictable positive drift enables feed-forward compensation in closed-loop systems and is significantly less than the ±5 % initial tolerance band (±1.35 V), making it usable in thermally stable reference designs.

BZX84W-C27-QF Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZX84W-Q

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 27 V

Tolerance:: ±7.04%

Power - Max:: 275 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 18.9 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:: SOT-323

BZX84W-C27-QF FAQ

1.How can I place an order for BZX84W-C27-QF through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84W-C27-QF 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 BZX84W-C27-QF reliable?

The price and inventory of BZX84W-C27-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C27-QF is usually 5 days.

3.What payment methods are accepted for BZX84W-C27-QF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C27-QF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84W-C27-QF?

BZX84W-C27-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84W-C27-QF 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 BZX84W-C27-QF?

For technical support, including BZX84W-C27-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C27-QF requirements.

6.How does Aetrix verify that BZX84W-C27-QF is sourced from the original manufacturer or authorized distributors?

All BZX84W-C27-QF 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 BZX84W-C27-QF meets industry standards.

7.What is the process for return or replacement of BZX84W-C27-QF?

All BZX84W-C27-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C27-QF, 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 BZX84W-C27-QF part is unused and in its original packaging.

Return procedure for BZX84W-C27-QF:

1.Submit a request within 90 days.

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

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