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

Diodes Incorporated BZX84C47-7-F

Name: BZX84C47-7-F
Brand: Diodes Incorporated
SKU: BZX84C47-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84C47-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

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

Datasheet:: BZX84C47-7-F.pdf

Description:: DIODE ZENER 47V 300MW SOT23-3

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Inventory:6,427

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Product details

Overview

BZX84C47-7-F from Diodes Incorporated is a 47 V, 350 mW surface-mount Zener diode in SOT-23 package, rated for 2 mA test current with 44.0–50.0 V zener voltage tolerance, 170 Ω dynamic impedance at 2 mA, and reverse leakage ≤0.1 μA at 30.1 V, used for precision voltage regulation and overvoltage protection in low-power DC rails.

For engineers reviewing the BZX84C47-7-F datasheet, BZX84C47-7-F pinout, BZX84C47-7-F application, or BZX84C47-7-F equivalent, key selection criteria include zener voltage tolerance (±6.4%), thermal resistance (357 °C/W), power derating above 50 °C, and RoHS-compliant matte tin plating on Alloy 42 leadframe.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load or input conditions. Its planar die construction ensures consistent breakdown characteristics and low temperature coefficient (10–12 mV/°C), enabling predictable regulation across -65 °C to +150 °C ambient range.

Designed for automated SMT assembly, it features moisture sensitivity level 1 per J-STD-020D and UL 94V-0 molded plastic case. The device exhibits typical total capacitance of ~10 pF at 47 V, supporting use in low-frequency reference and clamping circuits without signal integrity compromise.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	47 V nominal, 44.0–50.0 V min/max at I_ZT = 2 mA - defines regulation band for stable reference generation
Power Dissipation	350 mW at T_A = 25 °C - sets maximum continuous DC power handling on FR-4 board with recommended pad layout
Zener Impedance (Z_ZT)	170 Ω at I_ZT = 2 mA - determines output voltage variation under small-signal current changes
Reverse Leakage (I_R)	≤0.1 μA at V_R = 30.1 V - ensures minimal quiescent current in standby or high-impedance bias networks
Thermal Resistance (R_θJA)	357 °C/W - quantifies junction-to-ambient temperature rise per watt, critical for derating above 50 °C
Temperature Coefficient	+10.0 to +12.0 mV/°C - enables predictable V_Z drift compensation in temperature-stable references

Pinout & Package

Package: SOT-23 - surface-mount, 3-terminal plastic case with UL 94V-0 flammability rating, 0.008 g mass, and matte tin-plated Alloy 42 leads.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Forward conduction terminal	Connected to lower-potential node in reverse-biased Zener configuration; polarity must match schematic symbol orientation
Cathode (Pin 2)	Zener breakdown terminal	Connected to higher-potential node; carries regulated voltage during reverse operation; marked with cathode band on top view
No-connect / Heat Sink (Pin 3)	Leadframe thermal path	Internally tied to cathode metallization; provides primary thermal conduction path to PCB copper; not electrically isolated

Key Features

Feature	Design Value
Planar die construction	Ensures tight V_Z distribution and repeatable Zener impedance across production lots
RoHS-compliant green molding compound	Eliminates halogens and antimony; meets environmental compliance without sacrificing thermal or mechanical performance
Moisture sensitivity level 1	Enables direct placement without baking, reducing manufacturing overhead in high-volume SMT lines
Solderable terminals per MIL-STD-202	Guarantees reliable reflow joint formation using standard Pb-free or SnPb profiles

Applications

Industrial Sensor Signal Conditioning

USB Port Overvoltage Protection

Use Scenario: Stabilizing excitation voltage for bridge-based pressure transducers operating from 5 V or 12 V rails.

IC Role / Device Role / Timing Role: Zener diode functions as shunt voltage reference, maintaining constant bias voltage despite supply ripple or load variation.

Use Value: 47 V rating allows safe margin above common 24 V industrial supplies; ±6.4% tolerance ensures repeatability across sensor calibration batches.

Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events or ESD discharge.

IC Role / Device Role / Timing Role: Acts as low-leakage crowbar element, conducting only when VBUS exceeds 47 V to divert surge energy to ground.

Use Value: 0.1 μA leakage at 30.1 V prevents false triggering; 350 mW rating handles short-duration 10/1000 µs surges per IEC 61000-4-5 Level 3.

Low-Power Microcontroller Reset Circuit

Automotive Body Control Module Reference

Use Scenario: Generating precise reset threshold for 3.3 V or 5 V MCUs where internal brown-out detection lacks accuracy.

IC Role / Device Role / Timing Role: Provides accurate, temperature-compensated trigger point for external reset supervisor ICs or discrete RC-reset networks.

Use Value: +10–12 mV/°C TC enables predictable reset voltage shift over -40 to +85 °C automotive ambient; 170 Ω Z_ZT minimizes hysteresis error.

Use Scenario: Supplying stable reference voltage to analog front-end amplifiers monitoring door lock actuators or window motor current.

IC Role / Device Role / Timing Role: Functions as precision shunt regulator feeding ADC reference input or op-amp bias network.

Use Value: 44.0–50.0 V range accommodates 48 V battery systems with headroom; SOT-23 footprint supports compact PCB layout in space-constrained BCM modules.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ47VCW	Zener voltage 47 V ±5%, 200 mW P_D, 250 Ω Z_ZT at 5 mA	Lower power rating limits surge handling; higher Z_ZT reduces regulation precision	Select when cost sensitivity outweighs regulation stability requirements
BZX84-C47,115	Same 47 V spec, but 250 mW P_D, 115 Ω Z_ZT at 5 mA, SOT-23 package	Higher test current shifts operating point; lower Z_ZT improves regulation but increases leakage	Prefer for tighter regulation where 5 mA bias is acceptable and thermal budget permits

Compared with MMBZ47VCW, BZX84C47-7-F delivers 40% higher power margin and 30% lower impedance at 2 mA, making it more robust for rail-clamping; versus BZX84-C47,115, its lower test current enables better low-current regulation fidelity in battery-powered systems.

Availability

BZX84C47-7-F is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, microcontroller reset circuits, and automotive body control module references requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZX84C47-7-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, application-optimized components for industrial, computing, and automotive markets.

The BZX84 series belongs to Diodes' precision Zener portfolio, engineered for stable voltage reference and overvoltage protection in space-constrained, high-volume SMT applications where consistency, RoHS compliance, and thermal reliability are critical.

FAQ

What is the maximum reverse voltage before breakdown for BZX84C47-7-F?

The BZX84C47-7-F begins controlled reverse breakdown at 44.0 V (minimum specified zener voltage) and maintains regulation up to 50.0 V (maximum) at 2 mA test current. Below 44.0 V, reverse leakage remains ≤0.1 μA at 30.1 V, confirming non-conductive behavior in sub-threshold operation.

Can BZX84C47-7-F be used in place of a 43 V or 51 V Zener diode?

No - BZX84C47-7-F is specifically characterized for 47 V nominal regulation with 44.0–50.0 V tolerance. Substituting it for BZX84C43-7-F (43 V) or BZX84C51-7-F (51 V) would cause incorrect biasing or insufficient clamping margin, risking circuit malfunction or component overstress under nominal operating conditions.

How does the SOT-23 package affect thermal performance?

The SOT-23 package delivers R_θJA = 357 °C/W when mounted on FR-4 with recommended pad layout. This means a 350 mW dissipation causes ~125 °C junction rise above ambient. Derating is required above 50 °C ambient, reaching zero power at ~150 °C, per the published derating curve in DS30370 Rev. 6-2.

Is BZX84C47-7-F compatible with lead-free reflow processes?

Yes - the device uses matte tin-plated Alloy 42 leadframe and is qualified for standard Pb-free reflow profiles (peak 260 °C). Its moisture sensitivity level 1 eliminates pre-bake requirements, and terminals meet MIL-STD-202 Method 208 solderability specifications for both SnPb and Pb-free solder pastes.

BZX84C47-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 47 V

Tolerance:: ±6%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 170 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 32.9 V

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

Operating Temperature:: -65°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BZX84C47-7-F FAQ

1.How can I place an order for BZX84C47-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84C47-7-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 BZX84C47-7-F reliable?

The price and inventory of BZX84C47-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C47-7-F is usually 5 days.

3.What payment methods are accepted for BZX84C47-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C47-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84C47-7-F?

BZX84C47-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84C47-7-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 BZX84C47-7-F?

For technical support, including BZX84C47-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C47-7-F requirements.

6.How does Aetrix verify that BZX84C47-7-F is sourced from the original manufacturer or authorized distributors?

All BZX84C47-7-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 BZX84C47-7-F meets industry standards.

7.What is the process for return or replacement of BZX84C47-7-F?

All BZX84C47-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C47-7-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 BZX84C47-7-F part is unused and in its original packaging.

Return procedure for BZX84C47-7-F:

1.Submit a request within 90 days.

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

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