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Microchip Technology RE46C108S8TF
- Part No.:
- RE46C108S8TF
- Manufacturer:
- Microchip Technology
- Category:
- Sensor and Detector Interfaces
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
RE46C108S8TF.pdf
- Description:
- IC HORN DRIVER DUAL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,472
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Product details
Overview
RE46C108S8TF from R&E International (a Microchip subsidiary) is a piezoelectric horn driver with integrated 3.3V/5V voltage regulator, designed for low-voltage logic control of 9V piezoelectric horns in battery-powered safety alarms. It features 30mA continuous horn output current, 55mA regulated output, and brown-out protection at 4.5–5.5V.
For engineers reviewing the RE46C108S8TF datasheet, RE46C108S8TF pinout, RE46C108S8TF application, or RE46C108S8TF equivalent, key selection criteria include horn feedback compatibility, dual-regulator selectability via REGSEL, low 4µA standby current, and SOIC-8 packaging for space-constrained smoke/CO detector PCBs.
Technical Context
The RE46C108S8TF integrates a bandgap-referenced voltage regulator with programmable 3.3V or 5V output (selected by REGSEL), plus complementary high-current horn drive outputs (HORNS/HORNB) capable of ±16mA at 9V supply. Its FEED input supports self-oscillating piezo horn feedback up to ±22V.
Brown-out detection disables REGOUT when VDD falls below 4.5–5.5V; an internal clamp limits REGOUT overvoltage to 6.5V (5V mode) or 4.3V (3.3V mode). The device operates from −40°C to +85°C with 6–13.8V input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 6.0–13.8V - supports wide-input battery systems (e.g., 9V alkaline with aging) |
| Regulated Output | Selectable 3.3V or 5.0V ±2.5% - powers MCU/logic without external LDO |
| Horn Output Current | ±30mA continuous - drives standard 9V piezo transducers directly |
| Standby Current | 4µA - enables multi-year battery life in smoke detectors |
| Brown-Out Threshold | 4.5–5.5V - ensures clean regulator shutdown before logic malfunction |
| FEED Input Range | −10V to +22V - accommodates piezo feedback signals with large voltage swing |
| Operating Temp | −40°C to +85°C - certified for residential and industrial alarm environments |
Pinout & Package
RE46C108S8TF is housed in an 8-pin SOIC package (3.9mm × 4.9mm, 1.27mm pitch), RoHS-compliant and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REGSEL | Regulator Output Select | Logic-high = 5V REGOUT; logic-low = 3.3V REGOUT |
| VDD | Main Power Input | 6–13.8V unregulated supply for horn and regulator |
| REGOUT | Regulated Output | Stable 3.3V or 5V supply for microcontroller or sensor logic |
| FEED | Piezo Feedback Input | Accepts self-oscillation signal from piezo element (±22V tolerant) |
| HRNEN | Horn Enable Control | Active-low enable; pulls horn outputs to high-impedance when high |
| HORNS | Horn Source Output | N-channel driver output; sinks current to VSS during horn activation |
| HORNB | Horn Sink Output | P-channel driver output; sources current from VDD during horn activation |
| VSS | Ground Reference | Common return for regulator, logic, and horn drive circuits |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output horn drive (HORNS/HORNB) | Complementary N/P-channel outputs enable full-bridge-like piezo excitation without external H-bridge |
| Programmable regulator output | Single-pin REGSEL selects between 3.3V and 5V, eliminating need for external regulator selection circuitry |
| Ultra-low standby current | 4µA quiescent current extends battery life in always-on alarm applications beyond 5 years |
| Integrated brown-out protection | Automatic REGOUT disable below 4.5–5.5V prevents erratic MCU behavior during battery depletion |
| High-voltage FEED tolerance | −10V to +22V input range safely interfaces with resonant piezo feedback without clamping diodes |
Applications
| Smoke Detectors | CO Detectors |
|---|---|
Use Scenario: Battery-powered residential smoke alarm requiring audible alert under UL 217 compliance. IC Role / Device Role / Timing Role: Horn driver and logic supply regulator; generates 3.3V for MCU and drives 9V piezo transducer. Use Value: 4µA standby current enables >7-year battery life; brown-out protection ensures reliable end-of-life alert. | Use Scenario: Portable CO monitor with low-power MCU and audible alarm triggered on gas detection. IC Role / Device Role / Timing Role: Dual-role power and audio driver; supplies regulated 5V to sensor interface and pulses piezo horn. Use Value: FEED pin accepts self-oscillating feedback for efficient piezo drive; ±30mA output eliminates external driver stage. |
| Personal Security Alarms | Electronic Toys |
Use Scenario: Handheld panic button with loud piezo siren and ultra-low-power sleep mode. IC Role / Device Role / Timing Role: Low-quiescent horn controller; HRNEN enables instant wake-up and alarm activation. Use Value: Active-low HRNEN allows direct connection to MCU GPIO; 16mA output drive meets EN 50291 acoustic requirements. | Use Scenario: Educational toy with sound effects and coin-cell power source. IC Role / Device Role / Timing Role: Integrated voltage regulation and piezo excitation; simplifies BOM by replacing discrete LDO + transistor pair. Use Value: SOIC-8 footprint enables compact PCB layout; RoHS-compliant packaging satisfies consumer electronics regulations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar piezoelectric horn driver and voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RE46C128S8TF | Same pinout and function, but includes internal oscillator for direct-drive mode (no FEED required) | Preferred where self-oscillating piezo is unavailable or inconsistent; adds ~1ms startup delay | Choose RE46C128S8TF if FEED feedback is unreliable; otherwise RE46C108S8TF offers tighter feedback control |
| TPS61099YFFR | Boost converter only (no horn driver); requires external MOSFETs for piezo drive | Suitable for designs needing >5.5V regulated output or higher efficiency at light loads | Choose TPS61099YFFR only when horn drive is implemented separately and 3.3/5V regulation alone is insufficient |
Compared with RE46C128S8TF and TPS61099YFFR, the RE46C108S8TF uniquely combines feedback-controlled piezo drive and dual-voltage regulation in one SOIC-8 package-reducing component count and board area while maintaining precise acoustic output timing.
Availability
RE46C108S8TF is available at Aetrix Electronics and suitable for smoke detectors, CO detectors, and personal security products requiring stable component supply across long-lifecycle safety-critical programs.
Supply support for RE46C108S8TF 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
R&E International is a wholly owned subsidiary of Microchip Technology Inc., specializing in analog and mixed-signal ICs for safety, sensing, and audio applications.
The RE46C108S8TF belongs to R&E's piezoelectric alarm driver product line, engineered specifically for UL/EN-certified battery-powered life-safety devices with stringent low-power and reliability requirements.
FAQ
What is the function of the FEED pin on the RE46C108S8TF?
The FEED pin on the RE46C108S8TF accepts feedback from a self-oscillating piezoelectric horn to synchronize drive timing and maximize acoustic output efficiency. It operates over −10V to +22V and is internally clamped, eliminating need for external protection components. This feature is essential for stable operation in RE46C108S8TF-based smoke and CO detector designs.
How does the REGSEL pin configure the RE46C108S8TF regulator output?
The REGSEL pin on the RE46C108S8TF sets the regulated output voltage: logic-high (≥2.3V) selects 5.0V ±2.5%, and logic-low (≤1.0V) selects 3.3V ±2.5%. This single-pin configuration replaces external resistor networks or jumpers, simplifying design and reducing BOM count in RE46C108S8TF implementations.
What is the maximum continuous current the RE46C108S8TF can deliver to a piezo horn?
The RE46C108S8TF delivers up to 30mA continuous current through its HORNS and HORNB outputs, sufficient to drive standard 9V-rated piezoelectric transducers used in UL 217 and EN 50291 compliant alarms. This rating is validated across −40°C to +85°C and is specified in the official RE46C108S8TF datasheet (DS22165A).
Does the RE46C108S8TF include brown-out protection, and how does it behave?
Yes, the RE46C108S8TF includes built-in brown-out protection that disables REGOUT when VDD falls below 4.5–5.5V (falling edge). At that point, REGOUT is actively pulled to VSS with up to 25mA sink current. This ensures clean shutdown of downstream logic and prevents undefined behavior in RE46C108S8TF-based safety systems.
Is the RE46C108S8TF RoHS-compliant and available in lead-free packaging?
Yes, the RE46C108S8TF is available in RoHS-compliant, Pb-free packaging per Microchip's DS22165A specification. The SOIC-8 package meets JEDEC standards and is marked with "S8TF" suffix to denote lead-free finish, making it suitable for global consumer and industrial electronics manufacturing.
RE46C108S8TF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Horn Driver
- Input Type:
- Logic
- Output Type:
- Logic
- Current - Supply:
- 4 µA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
RE46C108S8TF FAQ
1.How can I place an order for RE46C108S8TF through Aetrix?
Please submit a Request for Quotation (RFQ) for RE46C108S8TF 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 RE46C108S8TF reliable?
The price and inventory of RE46C108S8TF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RE46C108S8TF is usually 5 days.
3.What payment methods are accepted for RE46C108S8TF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RE46C108S8TF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RE46C108S8TF?
RE46C108S8TF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RE46C108S8TF 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 RE46C108S8TF?
For technical support, including RE46C108S8TF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RE46C108S8TF requirements.
6.How does Aetrix verify that RE46C108S8TF is sourced from the original manufacturer or authorized distributors?
All RE46C108S8TF 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 RE46C108S8TF meets industry standards.
7.What is the process for return or replacement of RE46C108S8TF?
All RE46C108S8TF units undergo pre-shipment inspection (PSI). If there is an issue with RE46C108S8TF, 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 RE46C108S8TF part is unused and in its original packaging.
Return procedure for RE46C108S8TF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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