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Microchip Technology RE46C108S8F
- Part No.:
- RE46C108S8F
- Manufacturer:
- Microchip Technology
- Category:
- Sensor and Detector Interfaces
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
RE46C108S8F.pdf
- Description:
- IC HORN DRIVER DUAL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,540
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Product details
Overview
RE46C108S8F from R&E International (a Microchip subsidiary) is a piezoelectric horn driver with integrated 3.3V/5V selectable 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 operates from 6–13.8V supply across –40°C to +85°C.
For engineers reviewing the RE46C108S8F datasheet, RE46C108S8F pinout, RE46C108S8F application, or RE46C108S8F equivalent, key selection factors include REGSEL-configurable regulation, FEED pin support for self-oscillating horn feedback, low 4µA standby current, and DIP-8 package compatibility with smoke/CO detector BOMs.
Technical Context
The RE46C108S8F integrates a bandgap-referenced voltage regulator with programmable output (3.3V or 5V via REGSEL), a dual-output horn driver (HORNS/HORNB) capable of ±16mA sink/source, and a dedicated FEED input for closed-loop oscillation control in self-resonant piezo transducers. Brown-out detection disables REGOUT below 4.5–5.5V VDD.
Its CMOS-based architecture provides rail-to-rail horn output swing (0.3V low / 8.7V high at VDD=9V), overvoltage clamping on REGOUT (5.5–6.5V when REGSEL=VDD), and input leakage under ±100nA - enabling reliable operation in low-power, high-impedance alarm circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 6.0–13.8V - supports wide-input battery or line-powered alarm systems without external pre-regulation |
| Regulated Output Voltage | Selectable 3.3V (±0.2V) or 5.0V (±0.25V) - matches MCU I/O logic levels directly |
| Horn Output Current | ±30mA continuous - drives standard 9V piezoelectric horns without external boost stages |
| Standby Supply Current | 4µA - enables multi-year battery life in smoke detectors with periodic horn activation |
| Operating Temperature | –40°C to +85°C - qualified for residential and commercial indoor safety device environments |
| Brown-Out Threshold | 4.5–5.5V falling-edge detection - prevents erratic horn behavior during battery depletion |
| FEED Input Range | –10V to +22V - accommodates high-swing feedback signals from resonant piezo elements |
Pinout & Package
RE46C108S8F is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and 0.1-inch pin pitch, compatible with through-hole PCB assembly and standard socketing in alarm control boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REGSEL | Regulator Output Select | Logic-level input: VSS → 3.3V REGOUT; VDD → 5.0V REGOUT |
| 2 - VDD | Main Power Supply | Primary input (6–13.8V); powers horn driver and internal regulator |
| 3 - REGOUT | Regulated Output | Stable 3.3V or 5.0V supply for microcontroller or sensor circuitry |
| 4 - FEED | Horn Feedback Input | Accepts self-oscillation signal from piezo element; enables resonant drive mode |
| 5 - HRNEN | Horn Enable Control | Active-low logic input; disables both HORNS and HORNB outputs when high |
| 6 - HORNS | Horn Source Output | High-side driver output; sinks up to 30mA to VSS when active |
| 7 - HORNB | Horn Sink Output | Low-side driver output; sources up to 30mA from VDD when active |
| 8 - VSS | Ground Reference | Common return for regulator, logic, and horn drive paths |
Key Features
| Feature | Design Value |
|---|---|
| REGSEL-selectable regulation | Single-pin configuration enables field-flexible 3.3V/5V logic supply without hardware change |
| Self-oscillating horn support | FEED pin accepts AC feedback from piezo element to sustain resonance without external oscillator |
| Low-quiescent-current standby | 4µA VDD current with HRNEN high ensures minimal battery drain between alarm events |
| Dual complementary horn outputs | HORNS (source) and HORNB (sink) provide push-pull drive for maximum piezo efficiency |
| Integrated brown-out protection | Automatic REGOUT shutdown below 4.5V prevents logic malfunction during weak-battery conditions |
Applications
| Smoke Detectors | CO Detectors |
|---|---|
Use Scenario: Battery-powered residential smoke alarm requiring audible alert at >85dB with 10-year shelf life. IC Role / Device Role: Primary horn driver and MCU power supply regulator. Use Value: 4µA standby current extends lithium battery life; REGSEL allows same PCB design for 3.3V or 5V MCU variants. | Use Scenario: UL-listed carbon monoxide detector with intermittent self-test and loud alarm tone. IC Role / Device Role: Dual-role driver/regulator enabling compact, low-BOM-count alarm module. Use Value: FEED pin enables resonant piezo drive for higher SPL per mA; brown-out detection avoids false silence during battery decay. |
| Personal Security Products | Electronic Toys |
Use Scenario: Portable panic alarm with momentary button trigger and piercing 3kHz tone. IC Role / Device Role: High-efficiency horn interface with direct logic-level enable. Use Value: ±30mA horn drive delivers full acoustic output from single AA/AAA cell; DIP-8 simplifies manual assembly. | Use Scenario: Low-cost educational toy requiring simple beeping sound on button press. IC Role / Device Role: Integrated audio driver eliminating discrete transistor and LDO components. Use Value: 3.3V/5V REGOUT flexibility supports diverse MCU choices; RoHS-compliant packaging meets consumer electronics requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar piezoelectric horn driver and regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RE46C107S8F | Same pinout and function but fixed 5V REGOUT (no REGSEL); 50mA REGOUT rating | Lacks voltage selectability; suited only for 5V-only systems | Choose when 5V regulation is sufficient and board space permits no configuration overhead |
| TC7660S | Voltage converter (charge pump), not a horn driver; no FEED, HORNS/HORNB pins or brown-out protection | Requires external driver transistors and control logic for horn interface | Use only if separate regulation and drive functions are preferred and additional components acceptable |
Compared with RE46C107S8F and TC7660S, the RE46C108S8F uniquely combines selectable regulation, integrated dual-output horn drive, and self-oscillation feedback in one DIP-8 package - reducing component count and PCB area in safety-critical audible alarm designs.
Availability
RE46C108S8F is available at Aetrix Electronics and suitable for smoke detectors, CO detectors, and personal security products requiring stable component supply, long-lifecycle availability, and RoHS-compliant manufacturing.
Supply support for RE46C108S8F 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 alarm applications.
The RE46C108S8F belongs to R&E's piezoelectric transducer driver product line, engineered specifically for low-power, high-reliability audible alert systems in life-safety equipment.
FAQ
What is the function of the FEED pin on the RE46C108S8F?
The FEED pin on the RE46C108S8F accepts feedback from a self-oscillating piezoelectric horn to sustain resonant operation without external timing components. It supports input voltages from –10V to +22V and enables efficient, frequency-locked drive - a capability confirmed in the DS22165A datasheet functional block diagram and electrical characteristics table. This feature is integral to the RE46C108S8F's role in low-power alarm systems.
Can the RE46C108S8F drive a 9V piezoelectric horn directly?
Yes, the RE46C108S8F is explicitly designed to drive standard 9V piezoelectric horns directly using its complementary HORNS (source) and HORNB (sink) outputs, each rated for 30mA continuous current. The datasheet confirms ±16mA output swing at VDD=9V, and typical application circuits show direct connection to piezo elements - making external transistors unnecessary for most alarm-grade transducers.
How does the REGSEL pin configure the RE46C108S8F regulator output?
The REGSEL pin on the RE46C108S8F selects the regulated output voltage: tying REGSEL to VSS sets REGOUT to 3.3V (±0.2V), while tying it to VDD sets REGOUT to 5.0V (±0.25V). This is verified in the Electrical Characteristics table (DS22165A-page 2), where Regout limits are specified separately for each REGSEL state - enabling flexible logic supply design without component changes.
What is the brown-out behavior of the RE46C108S8F?
The RE46C108S8F disables REGOUT when VDD falls below the brown-out threshold (4.5–5.5V, falling edge), pulling REGOUT to VSS to prevent unstable MCU operation. The datasheet specifies 25mA pull-down current at VDD=4.5V and REGOUT=2V, ensuring rapid, deterministic shutdown - a critical safety feature confirmed in Absolute Maximum Ratings and Electrical Characteristics sections of DS22165A.
Is the RE46C108S8F available in RoHS-compliant packaging?
Yes, the RE46C108S8F is available in RoHS-compliant Pb-free packaging, as stated in the "Features" section of the DS22165A datasheet. This version meets EU Directive 2011/65/EU requirements and is suitable for consumer and safety-critical electronics where lead-free assembly is mandated - with no performance or reliability trade-offs versus standard packaging.
RE46C108S8F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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
RE46C108S8F FAQ
1.How can I place an order for RE46C108S8F through Aetrix?
Please submit a Request for Quotation (RFQ) for RE46C108S8F 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 RE46C108S8F reliable?
The price and inventory of RE46C108S8F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RE46C108S8F is usually 5 days.
3.What payment methods are accepted for RE46C108S8F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RE46C108S8F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RE46C108S8F?
RE46C108S8F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RE46C108S8F 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 RE46C108S8F?
For technical support, including RE46C108S8F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RE46C108S8F requirements.
6.How does Aetrix verify that RE46C108S8F is sourced from the original manufacturer or authorized distributors?
All RE46C108S8F 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 RE46C108S8F meets industry standards.
7.What is the process for return or replacement of RE46C108S8F?
All RE46C108S8F units undergo pre-shipment inspection (PSI). If there is an issue with RE46C108S8F, 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 RE46C108S8F part is unused and in its original packaging.
Return procedure for RE46C108S8F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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