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

Diodes Incorporated BZX84C12W-7-F

Name: BZX84C12W-7-F
Brand: Diodes Incorporated
SKU: BZX84C12W-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84C12W-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

Package:: SC-70, SOT-323

Datasheet:: BZX84C12W-7-F.pdf

Description:: DIODE ZENER 12V 200MW SOT323

Quantity:: RFQ Add To RFQ list

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Inventory:11,636

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Product details

Overview

BZX84C12W-7-F from Diodes Incorporated is a 12 V, 200 mW surface-mount Zener diode in SOT-323 package, rated for 5 mA test current with 11.4–12.7 V zener voltage tolerance, 25 Ω maximum zener impedance at 5 mA, and 0.1 µA maximum reverse leakage at 8.0 V. It provides precision voltage regulation in low-power biasing and reference circuits.

For engineers reviewing the BZX84C12W-7-F datasheet, BZX84C12W-7-F pinout, BZX84C12W-7-F application, or BZX84C12W-7-F equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (625 K/W), RoHS-compliant matte tin plating, ultra-small SOT-323 footprint, and temperature coefficient (+6.0 to +10.0 mV/°C) for stable reference performance across industrial temperature range.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable 12 V reference under controlled current conditions. Its planar die construction ensures consistent voltage regulation, while the SOT-323 package enables high-density PCB layouts in space-constrained applications.

It exhibits a positive temperature coefficient (+6.0 to +10.0 mV/°C) at 5 mA, indicating increasing zener voltage with rising junction temperature-critical for thermal drift analysis in precision analog circuits. Maximum power dissipation is derated linearly above 25°C per the 625 K/W thermal resistance specification.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	12.0 V nominal, 11.4–12.7 V min/max at I_ZT = 5 mA - defines regulation setpoint tolerance
Power Dissipation (P_D)	200 mW at T_A = 25°C - limits continuous bias current to ~16.7 mA at 12 V
Zener Impedance (Z_ZT)	25 Ω max at I_ZT = 5 mA, f = 1 kHz - determines AC regulation stiffness
Reverse Leakage (I_R)	0.1 µA max at V_R = 8.0 V - ensures minimal quiescent current in standby bias networks
Temp Coefficient (α_VZ)	+6.0 to +10.0 mV/°C at I_ZT = 5 mA - quantifies thermal drift of reference voltage
Thermal Resistance (R_θJA)	625 K/W on FR4 board - dictates junction-to-ambient temperature rise per watt dissipated
Operating Temp Range	−65°C to +125°C - supports industrial and automotive under-hood environments

Pinout & Package

Package: SOT-323 - ultra-small surface-mount plastic case (2.0 × 1.25 × 0.9 mm), UL 94V-0 rated, moisture sensitivity level 1, lead-free matte tin finish over Alloy 42 leadframe.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / cathode reference ground point in shunt regulator	Connected to circuit ground when used as shunt voltage reference; carries reverse leakage current
Cathode	Zener breakdown terminal / regulated output node	Connected to supply rail via current-limiting resistor; maintains 12 V relative to anode during regulation
Case / Exposed Pad	Non-electrical mechanical termination	No internal connection; serves only as thermal and mechanical anchor-no electrical function

Key Features

Feature	Design Value
Planar die construction	Ensures tight zener voltage distribution and long-term stability under thermal cycling
200 mW power rating	Enables use in low-current bias networks without heatsinking on standard FR4 PCBs
SOT-323 package	Reduces board area by >50% vs. SOT-23; compatible with high-speed pick-and-place assembly
Lead-free & RoHS compliant	Meets global environmental compliance requirements without sacrificing solderability or reliability
Green molding compound	Halogen-free, antimony-free encapsulation material meeting IPC-4101D/126 specifications

Applications

Power Supply Reference

Overvoltage Clamp

Use Scenario: Providing stable 12 V reference for op-amp feedback networks or ADC voltage references in battery-powered instrumentation.

IC Role / Device Role / Timing Role: Shunt voltage reference diode regulating node voltage against supply variation and load transients.

Use Value: Delivers ±5% voltage accuracy with <10 mV/°C thermal drift, enabling sub-1% system-level reference stability.

Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events exceeding 12 V in industrial sensor interfaces.

IC Role / Device Role / Timing Role: Passive clamping element diverting excess energy to ground when input exceeds 12.7 V breakdown threshold.

Use Value: Limits peak voltage to ≤12.7 V with <0.1 µA leakage below clamp threshold, preserving signal integrity.

LED Current Bias

Signal Level Translation

Use Scenario: Setting constant forward current for indicator LEDs in automotive dashboard modules operating from 12 V nominal bus.

IC Role / Device Role / Timing Role: Zener-based current source reference in conjunction with a series transistor or resistor network.

Use Value: Maintains LED brightness within ±8% over −40°C to +85°C ambient due to predictable tempco and low impedance.

Use Scenario: Translating 3.3 V logic signals to 12 V interface levels in PLC I/O expansion cards.

IC Role / Device Role / Timing Role: Clamping diode establishing upper rail for open-collector driver output stages.

Use Value: Enables clean 12 V logic-high definition with <25 Ω dynamic impedance, minimizing signal overshoot.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5242B-7-F	Zener voltage 12 V (11.4–12.6 V), 350 mW rating, SOT-23 package, 10 Ω Z_ZT	Higher power handling but larger footprint; lower zener impedance improves regulation stiffness	Select when >200 mW dissipation or <10 Ω impedance is required; verify PCB pad compatibility
1N4742A	12 V zener, 1 W rating, DO-35 axial package, 22 Ω Z_ZT, −65°C to +175°C operation	Through-hole mounting; higher thermal mass and power capability; unsuitable for automated SMT lines	Choose for prototyping, high-reliability legacy designs, or where manual assembly and thermal robustness outweigh size constraints

Compared with MMBZ5242B-7-F and 1N4742A, BZX84C12W-7-F offers optimal balance of ultra-compact SOT-323 size, industrial temperature range, and tight 12 V regulation for high-density consumer and industrial PCBs-without requiring layout redesign or thermal derating overhead.

Availability

BZX84C12W-7-F is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, LED biasing, and signal level translation requiring stable component supply and full RoHS compliance.

Supply support for BZX84C12W-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, cost-optimized components for industrial, computing, and consumer markets.

The BZX84C series targets compact, low-power voltage regulation and protection in space-constrained applications, emphasizing consistency, RoHS compliance, and manufacturability in high-volume SMT assembly.

FAQ

What is the maximum reverse voltage before breakdown for BZX84C12W-7-F?

The device begins controlled zener breakdown at 11.4 V (minimum specified zener voltage) and fully regulates between 11.4 V and 12.7 V at 5 mA test current. It is not rated for sustained reverse operation below this range-reverse voltage below 11.4 V results in only leakage current (<0.1 µA at 8.0 V).

Can BZX84C12W-7-F be used in parallel for higher power handling?

No-zener diodes exhibit manufacturing variations in breakdown voltage, causing current hogging and thermal runaway when paralleled. For higher power, select a single higher-rated part like MMBZ5242B-7-F (350 mW) or use active regulation instead.

Is the SOT-323 package thermally adequate for continuous 200 mW operation?

Yes, but only at T_A = 25°C with recommended FR4 pad layout. At 85°C ambient, derated power drops to ~120 mW (per 625 K/W R_θJA). For sustained 200 mW, forced air or copper pour thermal relief is required.

Does the "W" suffix indicate a specific tolerance grade?

Yes-the "W" denotes the BZX84C series variant with ±5% zener voltage tolerance (e.g., 12 V ±0.6 V). This differs from "A" (±1%) or "B" (±2%) grades in other Zener families, and is confirmed by the 11.4–12.7 V spec range in the datasheet.

BZX84C12W-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 12 V

Tolerance:: ±5%

Power - Max:: 200 mW

Impedance (Max) (Zzt):: 25 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 8 V

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

Operating Temperature:: -65°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

BZX84C12W-7-F FAQ

1.How can I place an order for BZX84C12W-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84C12W-7-F 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 BZX84C12W-7-F reliable?

The price and inventory of BZX84C12W-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C12W-7-F is usually 5 days.

3.What payment methods are accepted for BZX84C12W-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C12W-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84C12W-7-F?

BZX84C12W-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84C12W-7-F 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 BZX84C12W-7-F?

For technical support, including BZX84C12W-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C12W-7-F requirements.

6.How does Aetrix verify that BZX84C12W-7-F is sourced from the original manufacturer or authorized distributors?

All BZX84C12W-7-F 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 BZX84C12W-7-F meets industry standards.

7.What is the process for return or replacement of BZX84C12W-7-F?

All BZX84C12W-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C12W-7-F, 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 BZX84C12W-7-F part is unused and in its original packaging.

Return procedure for BZX84C12W-7-F:

1.Submit a request within 90 days.

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

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