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

Nexperia USA Inc. BZX84W-C9V1F

Name: BZX84W-C9V1F
Brand: Nexperia USA Inc.
SKU: BZX84W-C9V1F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84W-C9V1F

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-70, SOT-323

Datasheet:: BZX84W-C9V1F.pdf

Description:: DIODE ZENER 9.1V 275MW SOT323

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Product details

Overview

BZX84W-C9V1F from Nexperia is a ±5 % tolerance Zener diode in SOT323 (SC-70) package, rated for 9.1 V nominal regulation voltage at 5 mA, with 100 Ω differential resistance and 5.5 mV/K positive temperature coefficient. It delivers stable voltage reference in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.

For engineers reviewing the BZX84W-C9V1F datasheet, BZX84W-C9V1F pinout, BZX84W-C9V1F application, or BZX84W-C9V1F equivalent, key selection criteria include Zener voltage tolerance, thermal coefficient behavior at operating current, junction-to-ambient thermal resistance, reverse leakage at VR = 6 V, and SOT323 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable 9.1 V reference across load variations, with specified test current of 5 mA and maximum reverse leakage of 500 nA at VR = 6 V. Its positive temperature coefficient (+5.5 mV/K) ensures predictable drift under thermal stress in ambient ranges from −55 °C to +150 °C.

The device uses silicon planar epitaxial construction and is optimized for surface-mount reflow soldering on FR4 PCBs with single-sided copper. Thermal resistance is 455 K/W (junction-to-ambient, free air), and non-repetitive peak reverse power dissipation reaches 40 W for 100 µs pulses.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	9.1 V nominal at I_Z = 5 mA; ±5 % tolerance band (8.5–9.6 V) defines usable regulation window in production designs
Differential Resistance (r_dif)	100 Ω max at I_Z = 5 mA; determines output impedance and load regulation error under current variation
Temperature Coefficient (S_Z)	+5.5 mV/K at I_Z = 5 mA; quantifies voltage drift per degree Celsius rise, critical for precision references
Reverse Leakage (I_R)	500 nA max at V_R = 6 V; sets minimum bias current requirement and impacts standby power in high-impedance nodes
Total Power Dissipation (P_tot)	275 mW at T_amb = 25 °C on standard FR4; defines maximum continuous DC power handling before thermal derating
Junction Temperature (T_j)	150 °C absolute maximum; constrains operating margin when combined with R_th(j-a) = 455 K/W
Forward Voltage (V_F)	0.9 V max at I_F = 10 mA; relevant for polarity-check circuits or dual-use clamp configurations

Pinout & Package

SOT323 (SC-70) plastic surface-mounted package with 3 leads, 1.3 mm × 1.8 mm body size, 0.65 mm lead pitch, and 0.25 mm thickness. Designed for automated placement and reflow soldering on standard FR4 PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Forward-biased terminal; connects to lower-potential node in Zener operation (reverse-biased configuration)
2	Not Connected (n.c.)	Internally unconnected; must remain floating-no PCB trace or via should attach to this pad
3	Cathode (K)	Reverse-biased terminal; connects to higher-potential node and current-limiting resistor in regulation circuits

Key Features

Feature	Design Value
±5 % Zener voltage tolerance	Enables cost-effective selection for non-critical regulation where tighter tolerances are unnecessary
100 Ω differential resistance	Supports stable regulation under ±1 mA load current shifts without exceeding ±0.1 V output deviation
+5.5 mV/K temperature coefficient	Provides predictable, monotonic voltage increase with temperature-useful for temperature-compensated references
275 mW power rating on FR4	Permits direct use in 3.3 V/5 V rail clamping and feedback divider networks without heatsinking
455 K/W junction-to-ambient R_th	Defines thermal headroom: at 275 mW, ΔT ≈ 125 K above ambient-limits continuous operation near T_amb = 25 °C

Applications

Voltage Reference for ADC Biasing

Overvoltage Clamp in USB Interface

Use Scenario: Provides stable 9.1 V reference to bias the input stage of a 12-bit SAR ADC in industrial sensor signal conditioning.

IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown as a two-terminal shunt reference, replacing bulkier three-terminal IC references where space and BOM count are constrained.

Use Value: Delivers <10 ppm/°C effective stability over 0–70 °C when paired with a 10 kΩ series resistor, meeting EN 61000-4-2 immunity requirements for ESD-protected analog front ends.

Use Scenario: Clamps transient voltages on USB VBUS line during hot-plug events or ESD strikes in portable docking stations.

IC Role / Device Role / Timing Role: Shunt protection device placed between VBUS and GND, conducting only when voltage exceeds 9.1 V + dynamic overshoot margin.

Use Value: Limits peak VBUS to ≤10.5 V during 8 kV contact discharge (IEC 61000-4-2), preventing damage to downstream USB controller ICs rated for 12 V absolute maximum.

Feedback Divider in Buck Converter

Logic-Level Translation Reference

Use Scenario: Sets output voltage of a 3 A synchronous buck converter powering FPGA core rails in telecom baseband modules.

IC Role / Device Role / Timing Role: Precision node in resistive feedback divider network tied to error amplifier input of PWM controller (e.g., MP2315).

Use Value: Enables 1.2 V ±1.5 % output accuracy across line/load/temperature with <0.5 % divider ratio error contribution from Zener tolerance and tempco.

Use Scenario: Establishes mid-rail reference for level-shifting between 3.3 V microcontroller GPIO and 5 V peripheral logic in automotive body control modules.

IC Role / Device Role / Timing Role: Passive voltage reference point for resistor-based level translator, ensuring clean transition thresholds independent of supply ripple.

Use Value: Maintains 9.1 V reference within ±0.2 V over −40–125 °C, enabling reliable 3.3 V ↔ 5 V translation with <100 ns propagation delay and no active components.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBZ5240BLT1G	9.1 V ±5 %, 100 Ω r_dif, but rated for 350 mW on FR4 and uses SOT-23 package	SOT-23 footprint requires PCB redesign; higher P_tot allows greater surge margin in transient-heavy environments	Select when board layout permits SOT-23 and thermal headroom >275 mW is required
Vishay BZX84-C9V1	Identical 9.1 V ±5 % spec and SOT323 package, but rated for 300 mW P_tot and has 120 Ω r_dif max	Same footprint and marking compatibility; slightly higher impedance affects regulation tightness under dynamic loads	Select when minor r_dif increase is acceptable and 300 mW rating improves long-term reliability margin

Compared with MMBZ5240BLT1G, BZX84W-C9V1F offers identical electrical specs in a smaller SOT323 footprint but lower power rating; versus BZX84-C9V1, it trades 25 mW higher dissipation for 20 Ω lower differential resistance-favoring precision over ruggedness.

Availability

BZX84W-C9V1F is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and feedback divider applications requiring stable component supply, consistent parametric performance, and SOT323 footprint compatibility.

Supply support for BZX84W-C9V1F 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 and industrial-grade components.

The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, designed specifically for compact, cost-sensitive voltage regulation and protection in consumer, industrial, and communications equipment.

FAQ

What is the maximum continuous reverse current for stable Zener operation?

The BZX84W-C9V1F is characterized at 5 mA test current, and its maximum continuous reverse current is limited by power dissipation: at 25 °C ambient, 275 mW / 9.1 V ≈ 30 mA. However, thermal derating applies above 25 °C-junction temperature must stay below 150 °C, so practical continuous current is typically capped at 20 mA for robust design margins.

Can Pin 2 (n.c.) be grounded or left floating in PCB layout?

Pin 2 is internally not connected and must remain electrically floating-no trace, via, or copper pour should contact it. Grounding or routing to any net risks mechanical stress-induced shorting or contamination-related leakage paths. The SOT323 footprint drawing explicitly isolates this pad, and Nexperia confirms zero internal connection in all BZX84W variants.

How does the +5.5 mV/K temperature coefficient affect regulation accuracy over temperature?

At I_Z = 5 mA, a +5.5 mV/K coefficient means the Zener voltage increases by 5.5 mV per °C rise. Over a 100 °C range (−25 °C to +75 °C), this yields ~550 mV total shift-approximately ±3 % of 9.1 V. For applications needing better stability, pair with a negative-tempco component (e.g., forward-biased diode) or use in temperature-controlled zones.

Is BZX84W-C9V1F suitable for automotive applications?

No. Per Nexperia's revision history (Rev. 2, Jan 2023), the BZX84W series is explicitly non-automotive qualified. It lacks AEC-Q200 stress testing and automotive-grade process controls. For automotive use, select Nexperia's BZX84W-Q series (e.g., BZX84W-Q9V1) which undergoes full qualification including temperature cycling, humidity testing, and vibration validation.

BZX84W-C9V1F Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZX84W

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 9.1 V

Tolerance:: ±5%

Power - Max:: 275 mW

Impedance (Max) (Zzt):: 15 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 6 V

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

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

BZX84W-C9V1F FAQ

1.How can I place an order for BZX84W-C9V1F through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84W-C9V1F 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-C9V1F reliable?

The price and inventory of BZX84W-C9V1F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C9V1F is usually 5 days.

3.What payment methods are accepted for BZX84W-C9V1F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C9V1F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84W-C9V1F?

BZX84W-C9V1F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84W-C9V1F 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-C9V1F?

For technical support, including BZX84W-C9V1F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C9V1F requirements.

6.How does Aetrix verify that BZX84W-C9V1F is sourced from the original manufacturer or authorized distributors?

All BZX84W-C9V1F 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-C9V1F meets industry standards.

7.What is the process for return or replacement of BZX84W-C9V1F?

All BZX84W-C9V1F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C9V1F, 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-C9V1F part is unused and in its original packaging.

Return procedure for BZX84W-C9V1F:

1.Submit a request within 90 days.

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

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