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

Nexperia USA Inc. BZX84W-C30-QX

Name: BZX84W-C30-QX
Brand: Nexperia USA Inc.
SKU: BZX84W-C30-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84W-C30-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-70, SOT-323

Datasheet:: BZX84W-C30-QX.pdf

Description:: DIODE ZENER 30V 275MW SOT323

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Product details

Overview

BZX84W-C30-QX from Nexperia is a ±5% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 30 V nominal Zener voltage at 2 mA, 275 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides stable voltage reference in low-power regulation circuits, ESD protection clamping, and biasing networks in engine control units and infotainment power supplies.

For engineers reviewing the BZX84W-C30-QX datasheet, BZX84W-C30-QX pinout, BZX84W-C30-QX application, or BZX84W-C30-QX equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (455 K/W), non-repetitive peak reverse power (40 W), and automotive qualification status.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified Zener voltage of 28.5 V (min) to 32.0 V (max) at I_Z = 2 mA, exhibiting a temperature coefficient of +26.6 mV/K. Its differential resistance is ≤300 Ω at I_Z = 0.5 mA, supporting stable regulation under varying load conditions.

Designed for surface-mount reflow assembly on FR4 PCBs, it features a 3-terminal SOT323 package with anode (Pin 1), not-connected (Pin 2), and cathode (Pin 3). Reverse leakage current is limited to 50 nA at V_R = 0.7 × V_Znom, ensuring low standby power loss in precision biasing applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	28.5 V min to 32.0 V max at I_Z = 2 mA - defines regulated output range under nominal test condition
Tolerance	±5% - specifies maximum deviation from nominal 30 V rating for production batch consistency
Power Dissipation (P_tot)	275 mW at T_amb = 25 °C on FR4 PCB - sets continuous DC power handling limit in standard layout
Differential Resistance (r_dif)	≤300 Ω at I_Z = 0.5 mA - determines regulation stiffness and output impedance in feedback paths
Reverse Leakage (I_R)	50 nA at V_R = 21 V - ensures minimal quiescent current in high-impedance reference nodes
Thermal Resistance (R_th(j-a))	455 K/W - quantifies junction-to-ambient heat transfer efficiency on single-sided copper FR4
Peak Pulse Power (P_ZSM)	40 W at t_p = 100 µs - supports transient overvoltage suppression without failure

Pinout & Package

SOT323 (SC-70) leadless plastic surface-mount package with 3 terminals, footprint dimensions per Fig. 9 (reflow): 2.65 mm × 2.35 mm, 0.65 mm pitch, 0.55 mm pad width.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Forward-biased terminal; connects to lower-potential node in Zener regulation configuration
2	Not Connected (n.c.)	Internally unconnected; must remain floating-no PCB trace or solder mask opening required
3	Cathode (K)	Reverse-biased terminal; connects to higher-potential node and serves as regulated output reference point

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22-A114
Wide Zener voltage range	Supports 2.4 V to 75 V selection across 74 types-enables single-family sourcing for diverse rail voltages
Low capacitance	1.0 pF at f = 1 MHz, V_R = 0 V-minimizes signal distortion in high-frequency clamp and timing circuits
High surge capability	Withstands 40 W non-repetitive pulses-provides robust transient immunity in 12 V/24 V vehicle subsystems
Standard SOT323 footprint	Enables drop-in replacement with legacy BZX84 series and compatibility with existing pick-and-place tooling

Applications

Engine Control Unit (ECU) Reference

Infotainment Power Sequencing

Use Scenario: Providing stable 30 V reference for analog sensor signal conditioning in diesel ECU modules exposed to wide ambient temperature swings (−40 °C to +125 °C).

IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precision bias point for op-amp input stages and ADC reference dividers.

Use Value: ±5% tolerance and +26.6 mV/K temperature coefficient enable predictable drift compensation in closed-loop calibration algorithms.

Use Scenario: Clamping 3.3 V LDO enable lines during hot-swap events in automotive head unit power domains.

IC Role / Device Role / Timing Role: Transient voltage suppressor limiting overshoot on enable rails to prevent false turn-on of downstream PMICs.

Use Value: 40 W non-repetitive pulse rating absorbs 100 µs surges without degradation, maintaining system boot integrity.

Body Control Module (BCM) Bias Network

ADAS Camera Power Rail Protection

Use Scenario: Generating local 5 V bias for CAN transceiver termination resistors in distributed BCM nodes.

IC Role / Device Role / Timing Role: Low-leakage (50 nA) Zener shunt regulating node voltage while minimizing current draw from battery-backed supply.

Use Value: 275 mW power rating allows continuous operation at 2 mA without thermal derating on standard FR4 layouts.

Use Scenario: Protecting 12 V camera module power input against load-dump transients per ISO 7637-2 Pulse 5a.

IC Role / Device Role / Timing Role: Primary clamping device in parallel with TVS diode, sharing surge energy via controlled Zener conduction.

Use Value: 30 V Zener voltage aligns with 12 V system derating margin, enabling coordinated clamping with upstream TVS devices.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84W-B30-Q	±2% tolerance (29.4–30.6 V), lower rdif (≤300 Ω at I_Z = 1 mA), identical package and AEC-Q101 qualification	Higher precision required in feedback loops where <±100 mV drift is unacceptable	Select when tighter voltage stability outweighs cost sensitivity in closed-loop regulators
MMBZ5262BS-7-F	±5% tolerance (28.5–31.5 V), SOT-363 package, 200 mW P_tot, no AEC-Q101 certification	Consumer-grade portable electronics where automotive qualification is unnecessary	Choose only for non-automotive designs with space-constrained dual-diode layouts

Compared with BZX84W-C30-QX, the BZX84W-B30-Q offers tighter regulation at higher test current but same thermal and surge performance, while MMBZ5262BS-7-F sacrifices automotive reliability and power rating for dual-diode integration in compact consumer PCBs.

Availability

BZX84W-C30-QX is available at Aetrix Electronics and suitable for automotive ECU reference design, infotainment power sequencing, and ADAS camera protection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BZX84W-C30-QX 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 semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

The BZX84W-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for stable voltage reference and transient suppression in harsh-environment vehicle electronics.

FAQ

What is the maximum continuous forward current for BZX84W-C30-QX?

The device is not rated for continuous forward conduction; its absolute maximum forward current is 200 mA per limiting values table, but operation in forward bias is not intended. It is designed exclusively for reverse-bias Zener regulation or clamping, with forward voltage capped at 0.9 V at 10 mA.

Does BZX84W-C30-QX require a heatsink in standard FR4 layouts?

No heatsink is required. With a thermal resistance of 455 K/W and 275 mW maximum power dissipation, junction temperature rise is approximately 125 °C above ambient at full load-within the 150 °C absolute maximum rating-when mounted on standard single-sided copper FR4 per datasheet conditions.

How does the "QX" suffix differ from "Q" in the part number?

The "QX" suffix denotes a specific tape-and-reel packaging variant compliant with EIA-481-D standards, featuring 3000 units per reel and moisture sensitivity level (MSL) 1. The base "Q" indicates AEC-Q101 qualification; "QX" adds packaging and handling specifications for automated SMT assembly without altering electrical or thermal characteristics.

Can BZX84W-C30-QX replace older BZX84-C30 parts in existing designs?

Yes, with verification of layout compatibility. BZX84W-C30-QX uses the same SOT323 footprint and electrical specifications as legacy BZX84-C30 but adds AEC-Q101 qualification, improved surge rating (40 W vs. 30 W), and tighter process control. Pin 2 remains n.c., preserving mechanical and schematic compatibility.

BZX84W-C30-QX 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):: 30 V

Tolerance:: ±5.79%

Power - Max:: 275 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 700 mV

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-C30-QX FAQ

1.How can I place an order for BZX84W-C30-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84W-C30-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 BZX84W-C30-QX reliable?

The price and inventory of BZX84W-C30-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C30-QX is usually 5 days.

3.What payment methods are accepted for BZX84W-C30-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C30-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84W-C30-QX?

BZX84W-C30-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84W-C30-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 BZX84W-C30-QX?

For technical support, including BZX84W-C30-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C30-QX requirements.

6.How does Aetrix verify that BZX84W-C30-QX is sourced from the original manufacturer or authorized distributors?

All BZX84W-C30-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 BZX84W-C30-QX meets industry standards.

7.What is the process for return or replacement of BZX84W-C30-QX?

All BZX84W-C30-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C30-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 BZX84W-C30-QX part is unused and in its original packaging.

Return procedure for BZX84W-C30-QX:

1.Submit a request within 90 days.

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

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