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Home > Products > Integrated Circuits (ICs) > Interface > Sensor and Detector Interfaces

Microchip Technology RE46C100D8TF

Name: RE46C100D8TF
Brand: Microchip Technology
SKU: RE46C100D8TF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RE46C100D8TF

Manufacturer:: Microchip Technology

Category:: Sensor and Detector Interfaces

Package:: 8-VFDFN Exposed Pad

Datasheet:: RE46C100D8TF.pdf

Description:: IC HORN DRIVER 8DFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

RE46C100D8TF from Microchip Technology is a piezoelectric horn driver IC designed for self-oscillating and direct-drive alarm applications. It features low quiescent current (<100 nA), 20 Ω typical R_ON at 9 V, and operates across 6–16 V supply range. Its primary role is to drive three-terminal piezoelectric horns in smoke and CO detectors.

For engineers reviewing the RE46C100D8TF datasheet, RE46C100D8TF pinout, RE46C100D8TF application, or RE46C100D8TF equivalent, this device is selected for ultra-low-power audible alert generation where horn enable control, feedback-driven oscillation, and thermal-efficient DFN packaging are critical design requirements.

Technical Context

The RE46C100D8TF integrates a push-pull output stage with complementary HORNB/HORNS outputs, enabling full-bridge drive of piezoelectric transducers. Its FEED pin supports either internal feedback (self-oscillation) or external signal input for two-terminal horn modulation.

It implements logic-level HRNEN control (VIH = 2.3 V min, VIL = 1 V max) with active-high horn enable, and includes thermal protection via 75 °C/W junction-to-ambient resistance in its 2×3 mm DFN package with exposed thermal pad (EP) tied to VSS.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	6–16 V - supports single 9 V battery operation with margin for aging and cold-temperature drop.
Quiescent Current	<100 nA - enables multi-year battery life in standby mode for smoke/CO detector applications.
Output R_ON	20 Ω typical at 9 V - ensures efficient power delivery to piezoelectric load with minimal voltage drop.
Horn Enable Threshold	V_IH = 2.3 V min, V_IL = 1 V max - compatible with standard CMOS logic and microcontroller GPIO without level-shifting.
Operating Temperature	−40°C to +85°C - qualified for residential and industrial environmental monitoring enclosures.
Thermal Resistance θ_JA	75 °C/W - enables reliable operation in compact, sealed detector housings with limited airflow.
FEED Pin Voltage Range	−10 V to +22 V - accommodates feedback signals from high-voltage piezoelectric elements without clamping diodes.

Pinout & Package

RE46C100D8TF is housed in an 8-lead 2×3 mm DFN package with exposed thermal pad (EP), optimized for space-constrained, thermally sensitive alarm modules.

Pin/Terminal	Circuit Role	Design Meaning
1, 3 NC	No connection	Unused pins; must remain unconnected per datasheet - no internal function or tie requirement.
2 VDD	Positive supply input	Primary power rail; requires local 1 µF decoupling capacitor adjacent to pin per layout guidance.
4 FEED	Feedback or external signal input	Configures self-oscillation (via resistor-coupled horn feedback) or accepts external drive signal for modulated tone.
5 VSS	Negative supply reference	Ground return path; also connects to exposed thermal pad (EP) for optimal heat dissipation.
6 HORNB	Bridge output (metal electrode)	Drives one side of piezoelectric transducer; complements HORNS for push-pull operation.
7 HORNS	Bridge output (ceramic electrode)	Complementary output to HORNB; together they generate differential AC drive waveform.
8 HRNEN	Horn enable control	Active-high logic input; enables/disables oscillator and output stage - used for tone gating and alarm sequencing.
EP (Pin 9)	Exposed thermal pad	Internally connected to VSS; must be soldered to PCB ground plane to achieve rated θ_JA = 75 °C/W.

Key Features

Feature	Design Value
Ultra-low standby current	<100 nA enables >10-year battery life in smoke detectors using standard 9 V alkaline cells.
Integrated push-pull driver	Eliminates need for external H-bridge or discrete MOSFETs - reduces BOM count and PCB area by ≥4 components.
Self-oscillating capability	Internal feedback loop via FEED pin allows autonomous tone generation without external timing components.
Wide supply voltage range	6–16 V operation supports both fresh and depleted 9 V batteries and dual-cell Li-ion configurations.
Logic-compatible enable input	HRNEN accepts standard 3.3 V/5 V MCU GPIO signals directly - no pull-up or level-shifter required.

Applications

Smoke Detector Audio Alert	CO Detector Alarm Module
Use Scenario: Battery-powered residential smoke detector requiring UL-compliant audible alarm with multi-year standby life. IC Role / Device Role: Piezoelectric horn driver providing regulated, modulated tone output under microcontroller command. Use Value: <100 nA quiescent current extends battery service life beyond 10 years; integrated feedback eliminates external oscillator components.	Use Scenario: Portable CO detector with intermittent self-test and alarm activation triggered by gas sensor output. IC Role / Device Role: Low-power audio driver enabling tone burst generation during alarm and periodic chirp during self-test. Use Value: Active-high HRNEN allows precise MCU-controlled tone gating; wide VDD range maintains output volume as battery discharges.
Personal Security Alarm	Electronic Toy Sound Generator
Use Scenario: Handheld panic button device requiring loud, attention-grabbing tone with minimal PCB footprint. IC Role / Device Role: Compact horn driver delivering high-efficiency AC drive to piezoelectric transducer from coin-cell or AAA battery. Use Value: 2×3 mm DFN package with EP reduces board area by >50% vs. SOIC; low R_ON maximizes sound pressure level (SPL) per mA.	Use Scenario: Low-cost educational toy with programmable sound effects and battery-operated operation. IC Role / Device Role: General-purpose piezo driver supporting both continuous tones and pulsed patterns via HRNEN modulation. Use Value: FEED pin flexibility allows either self-oscillating beep or externally controlled melody generation - one IC serves multiple sound modes.

Smoke Detector Audio Alert

CO Detector Alarm Module

Use Scenario: Battery-powered residential smoke detector requiring UL-compliant audible alarm with multi-year standby life.

IC Role / Device Role: Piezoelectric horn driver providing regulated, modulated tone output under microcontroller command.

Use Value: <100 nA quiescent current extends battery service life beyond 10 years; integrated feedback eliminates external oscillator components.

Use Scenario: Portable CO detector with intermittent self-test and alarm activation triggered by gas sensor output.

IC Role / Device Role: Low-power audio driver enabling tone burst generation during alarm and periodic chirp during self-test.

Use Value: Active-high HRNEN allows precise MCU-controlled tone gating; wide VDD range maintains output volume as battery discharges.

Personal Security Alarm

Electronic Toy Sound Generator

Use Scenario: Handheld panic button device requiring loud, attention-grabbing tone with minimal PCB footprint.

IC Role / Device Role: Compact horn driver delivering high-efficiency AC drive to piezoelectric transducer from coin-cell or AAA battery.

Use Value: 2×3 mm DFN package with EP reduces board area by >50% vs. SOIC; low R_ON maximizes sound pressure level (SPL) per mA.

Use Scenario: Low-cost educational toy with programmable sound effects and battery-operated operation.

IC Role / Device Role: General-purpose piezo driver supporting both continuous tones and pulsed patterns via HRNEN modulation.

Use Value: FEED pin flexibility allows either self-oscillating beep or externally controlled melody generation - one IC serves multiple sound modes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar piezoelectric horn driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
RE46C100E8F	Same die, PDIP-8 package (θ_JA = 89.3 °C/W); no exposed thermal pad; through-hole mounting.	Better suited for prototyping or legacy through-hole assemblies; higher thermal resistance limits sustained output duty cycle.	Select when manual assembly, breadboarding, or compatibility with existing PDIP footprints is required.
RE46C100S8F	Same die, SOIC-8 package (θ_JA = 149.5 °C/W); surface-mount but larger footprint and inferior thermal performance.	Appropriate for cost-sensitive consumer products where thermal load is low and board space is not constrained.	Choose only if SOIC is mandated by production line constraints; avoid for high-duty-cycle or thermally isolated enclosures.

Compared with RE46C100E8F and RE46C100S8F, the RE46C100D8TF delivers superior thermal management (75 °C/W) and smallest PCB footprint, making it the optimal choice for modern, space-limited, battery-operated safety devices requiring long-term reliability.

Availability

RE46C100D8TF is available at Aetrix Electronics and suitable for smoke detector manufacturing, CO alarm module integration, and personal security device production requiring stable component supply and long-lifecycle support.

Supply support for RE46C100D8TF 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

Microchip Technology Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and interface ICs for embedded control and safety-critical systems.

The RE46C100 series was developed specifically for ultra-low-power audible alarm generation in life-safety equipment, emphasizing quiescent current minimization, robust piezoelectric drive capability, and qualification across extended temperature ranges.

FAQ

What is the primary function of the RE46C100D8TF in a smoke detector system?

The RE46C100D8TF serves as a dedicated piezoelectric horn driver IC that generates audible alarm tones in smoke detectors. It provides push-pull output drive to a three-terminal piezoelectric transducer, supports self-oscillation via the FEED pin, and enables precise tone control through the HRNEN input. Its <100 nA quiescent current directly contributes to multi-year battery life in the RE46C100D8TF-based detector design.

How does the FEED pin operate in the RE46C100D8TF?

The FEED pin on the RE46C100D8TF functions either as a feedback input for self-oscillating operation (connected to the horn's feedback electrode via a current-limiting resistor) or as an external signal input for driving two-terminal piezoelectric horns. When unused, it must be tied to VDD or VSS. Its −10 V to +22 V rating allows safe interfacing with high-voltage piezo elements without external protection circuitry in the RE46C100D8TF application.

What is the purpose of the exposed thermal pad (EP) on the RE46C100D8TF DFN package?

The exposed thermal pad (EP) on the RE46C100D8TF is internally connected to VSS and must be soldered to a PCB ground plane to achieve the specified thermal resistance of 75 °C/W. This thermal path is essential for maintaining junction temperature within safe limits during sustained horn drive operation. Failure to connect the EP compromises thermal performance and may lead to premature device failure in the RE46C100D8TF implementation.

Can the RE46C100D8TF drive a two-terminal piezoelectric horn?

Yes, the RE46C100D8TF can drive a two-terminal piezoelectric horn by using the FEED pin as an external signal input while configuring HORNB and HORNS as complementary outputs. In this mode, the internal oscillator is disabled, and tone generation is controlled entirely by the external signal applied to FEED. This capability makes the RE46C100D8TF adaptable to both self-oscillating and externally modulated architectures.

What are the absolute maximum ratings for the RE46C100D8TF supply voltage and operating temperature?

The RE46C100D8TF has an absolute maximum supply voltage of 18 V and an operating temperature range of −40°C to +85°C. These ratings ensure robustness in real-world battery-powered environments where voltage spikes and ambient temperature extremes occur. The RE46C100D8TF remains fully functional within its specified 6–16 V operating range and maintains parameter integrity across the full −40°C to +85°C span.

RE46C100D8TF Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Package/Case:: 8-VFDFN Exposed Pad

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Controller

Input Type:: -

Output Type:: -

Current - Supply:: 100 nA

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN (2x3)

RE46C100D8TF FAQ

1.How can I place an order for RE46C100D8TF through Aetrix?

Please submit a Request for Quotation (RFQ) for RE46C100D8TF 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 RE46C100D8TF reliable?

The price and inventory of RE46C100D8TF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RE46C100D8TF is usually 5 days.

3.What payment methods are accepted for RE46C100D8TF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RE46C100D8TF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RE46C100D8TF?

RE46C100D8TF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RE46C100D8TF 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 RE46C100D8TF?

For technical support, including RE46C100D8TF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RE46C100D8TF requirements.

6.How does Aetrix verify that RE46C100D8TF is sourced from the original manufacturer or authorized distributors?

All RE46C100D8TF 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 RE46C100D8TF meets industry standards.

7.What is the process for return or replacement of RE46C100D8TF?

All RE46C100D8TF units undergo pre-shipment inspection (PSI). If there is an issue with RE46C100D8TF, 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 RE46C100D8TF part is unused and in its original packaging.

Return procedure for RE46C100D8TF:

1.Submit a request within 90 days.

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

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