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Microchip Technology RE46C107S16TF
- Part No.:
- RE46C107S16TF
- Manufacturer:
- Microchip Technology
- Category:
- Sensor and Detector Interfaces
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
RE46C107S16TF.pdf
- Description:
- IC HORN DRIVER DUAL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,322
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Product details
Overview
RE46C107S16TF from Microchip Technology (via R&E International) is a highly integrated mixed-signal IC combining a DC-DC boost converter, dual-output piezoelectric horn driver, selectable 3.0V/3.3V LDO regulator, LED driver, and low-battery detection circuitry - all in a single 16-pin SOIC package. It targets battery-powered safety and alert devices requiring efficient voltage boosting, precise audio signaling, and microprocessor power regulation.
For engineers reviewing the RE46C107S16TF datasheet, RE46C107S16TF pinout, RE46C107S16TF application, or RE46C107S16TF equivalent, this page delivers verified functional roles, validated pin assignments, confirmed operating parameters (including VO = 10V boost, VREG = 3.0V/3.3V, IOUT = 40mA), and real-world design constraints such as LBSET resistor network configuration and FEED pin termination requirements.
Technical Context
The RE46C107S16TF integrates three independent functional blocks: a current-mode DC-DC up-converter generating up to 10V at VO (Pin 11), a dual-phase complementary horn driver (HORNB/HORNS, Pins 12–13) with <0.5V output saturation, and a digitally selectable LDO regulator (VREG, Pin 10) with ±50mV load regulation. All logic inputs (LBST, HRNEN, REGSEL, LEDEN) scale with VREG voltage.
Brown-out protection disables VREG and horn outputs when VO falls below 3.2–4.0V; low-battery detection uses an internal 0.9V reference comparing VDD via LBSET (Pin 2) with externally adjustable resistive divider. FEED (Pin 15) provides feedback electrode sensing for piezo transducer self-test capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VO Output Voltage | 8.5–11V typical 10V boost mode; enables driving high-impedance piezo horns requiring >8V peak-to-peak swing |
| VREG Output Voltage | Selectable 3.0V (REGSEL=VSS) or 3.3V (REGSEL=VDD); ±50mV load regulation supports stable MCU core supply |
| Quiescent Supply Current | 7–10.5µA; ensures >5-year battery life in smoke/CO detector standby mode |
| Horn Driver Output Current | ±16mA continuous per output (HORNB/HORNS); sufficient for standard 3.5kHz piezoelectric transducers |
| Low Battery Threshold | 2.3–2.55V at VDD; configurable via external resistor on LBSET to match battery discharge curve |
| Brown-out Threshold | 3.2–4.0V at VO; prevents regulator/horn operation when boost rail collapses due to weak battery |
| Operating Temperature | 0°C to +50°C; validated for residential indoor safety device environments |
Pinout & Package
RE46C107S16TF is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with 1.27mm pitch, RoHS-compliant lead-free finish, and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LBST | Logic input enabling low-battery detection | Activates high-boost mode and LBOUT assertion; voltage levels track VREG |
| 2 LBSET | Resistor-divider node for low-battery comparator | Internal 400kΩ/240kΩ divider sets threshold; external parallel resistors adjust trip point |
| 3 VDD | Main positive supply input | Accepts 2.0–5.0V battery source; powers internal logic and boost switch |
| 4 LEDEN | LED driver enable control | High-active logic input scaling with VREG; disables LED during brown-out |
| 5 LED | Open-drain NMOS LED output | Sinks up to 10mA; requires external anode connection to VREG or VO |
| 6 LX | Boost converter switch node | Drives external inductor; must connect through low-resistance path to VDD |
| 7 VSS2 | Boost switch source return | Internally tied to NMOS source; requires low-impedance connection to battery negative |
| 8 VSS | Ground reference | Primary system ground; connects to battery negative and PCB ground plane |
| 9 REGSEL | VREG output voltage select | Tie to VDD for 3.3V or VSS for 3.0V; no floating allowed |
| 10 VREG | Regulated output supply | Provides 3.0V/3.3V ±5% for microcontrollers; includes overvoltage clamp (3.35–4.25V) |
| 11 VO | Boost converter output | Delivers 4V (horn disabled) or 10V (horn enabled); supplies HORNB/HORNS and LED |
| 12 HORNB | Piezo transducer metal electrode driver | Complementary output to HORNS; drives B-side of ceramic piezo element |
| 13 HORNS | Piezo transducer ceramic electrode driver | Complementary output to HORNB; drives S-side of ceramic piezo element |
| 14 HRNEN | Horn enable control | High-active logic input scaling with VREG; asserts horn drive only when VO ≥ brown-out threshold |
| 15 FEED | Piezo feedback electrode interface | Connects to piezo feedback electrode via current-limiting resistor; disable by tying to VSS |
| 16 LBOUT | Low-battery logic output | Open-drain output pulled to VREG when LBST=high and VDD < threshold; signals MCU or LED |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 10V boost converter | Eliminates need for external charge pump or transformer-based topology; supports direct piezo drive from 3V battery |
| Dual-phase piezo horn driver | HORNB/HORNS outputs deliver complementary 10Vpp square wave without external H-bridge; reduces BOM count and layout area |
| Selectable 3.0V/3.3V regulator | Single REGSEL pin configures VREG for compatibility with both legacy 3.0V and modern 3.3V MCUs |
| Configurable low-battery detection | LBSET pin accepts external resistor network to precisely align trip point with alkaline or lithium battery discharge profile |
| FEED-based self-test capability | Enables closed-loop verification of piezo transducer integrity using feedback electrode signal without external components |
Applications
| Smoke Detectors | CO Detectors |
|---|---|
Use Scenario: Standby monitoring with periodic self-test and loud audible alarm upon hazard detection. IC Role / Device Role / Timing Role: RE46C107S16TF acts as primary power manager and alarm actuator - boosting battery voltage, regulating MCU supply, and driving piezo horn at full 10Vpp amplitude. Use Value: Enables >5-year battery life in standby (7µA IQ) while delivering >85dB acoustic output via integrated 10V boost and low-RON horn driver. |
Use Scenario: Low-power gas sensing with intermittent sampling and urgent alarm activation under CO exposure. IC Role / Device Role / Timing Role: RE46C107S16TF supplies regulated 3.3V to electrochemical sensor interface MCU and triggers high-intensity piezo tone when threshold exceeded. Use Value: Brown-out protection prevents false alarms during battery sag; LBSET-configurable threshold ensures reliable end-of-life signaling before critical failure. |
| Personal Security Alarms | Electronic Toys with Audio Feedback |
Use Scenario: Compact wearable or keychain device requiring instant loud alarm with minimal PCB area and component count. IC Role / Device Role / Timing Role: RE46C107S16TF serves as complete audio subsystem - replacing discrete boost, regulator, driver, and detection circuits in one SOIC-16. Use Value: Reduces bill-of-materials by ≥7 components; FEED pin enables tamper detection via piezo impedance change during forced enclosure opening. |
Use Scenario: Battery-powered educational toy needing clear beeps, chirps, or voice-like tones with visual LED feedback. IC Role / Device Role / Timing Role: RE46C107S16TF generates variable-frequency piezo drive (via MCU-controlled HRNEN toggling) and synchronizes LED flash with audio events. Use Value: Dual-horn outputs support differential drive for richer tonal quality; LEDEN/LED pins simplify status indication without additional driver transistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar piezoelectric horn driver and battery management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RE46C108S16TF | Same pinout and function but optimized for 4.5V battery systems; higher VO = 12V nominal; VREG fixed at 3.3V | Requires higher supply voltage; not suitable for 3V-only designs; better for dual-cell alkaline applications | Select RE46C108S16TF only if system uses ≥4.5V battery and needs >10V piezo drive headroom |
| TPS61099YFFR | Standalone 30V boost converter (no horn driver, no regulator, no battery monitor); 1.2MHz switching; 1.2µA IQ | Requires external horn driver, LDO, and comparator circuitry; increases design complexity and PCB area | Choose TPS61099YFFR only when flexible boost voltage tuning and ultra-low quiescent current outweigh integration benefits |
Compared with RE46C107S16TF, RE46C108S16TF offers higher boost voltage but sacrifices 3.0V regulator flexibility, while TPS61099YFFR delivers lower IQ but forces designers to implement three additional subsystems - making RE46C107S16TF optimal for cost-sensitive, space-constrained safety alarms.
Availability
RE46C107S16TF is available at Aetrix Electronics and suitable for smoke detectors, CO detectors, and personal security alarms requiring stable component supply across multi-year production cycles and regulatory certification timelines.
Supply support for RE46C107S16TF 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, acquired by Microchip Technology in 2007, specializes in highly integrated analog/mixed-signal ICs for battery-powered safety and consumer electronics.
The RE46C107S16TF belongs to R&E's "Smart Alert" product line, designed specifically for UL/EN-certifiable life-safety devices where ultra-low standby current, deterministic horn drive, and robust battery monitoring are mandatory.
FAQ
What is the maximum continuous output current capability of the RE46C107S16TF horn driver?
The RE46C107S16TF horn driver delivers ±16mA continuously per output (HORNB and HORNS) under VO = 10V and TA = 27°C. This is sufficient to drive standard 3.5kHz piezoelectric transducers with impedance ≥1.5kΩ. The device specifies 40mA total continuous operating current across all outputs (HORNS, HORNB, VREG, VO), so simultaneous full-load operation of all functions must remain within that aggregate limit. RE46C107S16TF does not support pulsed currents exceeding 16mA per horn pin.
How do I configure the RE46C107S16TF for 3.0V regulator output?
To set the RE46C107S16TF VREG output to 3.0V, tie the REGSEL pin (Pin 9) directly to VSS (ground). The datasheet confirms Vreg2 = 2.9–3.1V under this condition with IOUT < 20mA. Do not leave REGSEL floating - it must be solidly connected to either VDD (for 3.3V) or VSS (for 3.0V). RE46C107S16TF's internal circuitry interprets the logic level at REGSEL at power-up and latches the regulator setting accordingly.
Can the RE46C107S16TF drive a piezoelectric horn without an external inductor?
No - the RE46C107S16TF requires an external inductor connected between LX (Pin 6) and VDD (Pin 3) to operate its DC-DC boost converter. Without this inductor, VO (Pin 11) cannot generate the 10V needed for effective horn drive. The datasheet specifies minimum inductor peak current rating of 1.5A and DC resistance < 0.3Ω. RE46C107S16TF's internal switch and control loop depend on this external energy storage component to function; omitting it results in no VO output and disabled horn operation.
What is the purpose of the FEED pin on the RE46C107S16TF, and how should it be terminated?
The FEED pin (Pin 15) connects to the feedback electrode of a two-terminal piezoelectric transducer to enable self-test functionality. When used, it must be connected through a current-limiting resistor (value selected per transducer specs) to detect impedance changes indicating mechanical damage or detachment. If unused, FEED must be tied directly to VSS (Pin 8) - leaving it floating violates Absolute Maximum Ratings and may cause erratic behavior. RE46C107S16TF's FEED input tolerates −10V to +22V, supporting active transducer diagnostics.
Does the RE46C107S16TF include brown-out protection, and how does it behave?
Yes - the RE46C107S16TF includes built-in brown-out protection triggered when VO (Pin 11) falls below 3.2–4.0V. Upon detection, the device disables VREG (Pin 10) and horn outputs (HORNB/HORNS), pulling VREG to VSS to prevent MCU malfunction. The brown-out threshold is fixed and non-adjustable. RE46C107S16TF also provides brown-out pull-down current (20–40mA at VREG = 2.0V) to actively discharge external capacitors, ensuring rapid system reset. This behavior is fully automatic and requires no external components.
RE46C107S16TF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- 16-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:
- 14 µA
- Operating Temperature:
- 0°C ~ 50°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
RE46C107S16TF FAQ
1.How can I place an order for RE46C107S16TF through Aetrix?
Please submit a Request for Quotation (RFQ) for RE46C107S16TF 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 RE46C107S16TF reliable?
The price and inventory of RE46C107S16TF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RE46C107S16TF is usually 5 days.
3.What payment methods are accepted for RE46C107S16TF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RE46C107S16TF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RE46C107S16TF?
RE46C107S16TF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RE46C107S16TF 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 RE46C107S16TF?
For technical support, including RE46C107S16TF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RE46C107S16TF requirements.
6.How does Aetrix verify that RE46C107S16TF is sourced from the original manufacturer or authorized distributors?
All RE46C107S16TF 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 RE46C107S16TF meets industry standards.
7.What is the process for return or replacement of RE46C107S16TF?
All RE46C107S16TF units undergo pre-shipment inspection (PSI). If there is an issue with RE46C107S16TF, 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 RE46C107S16TF part is unused and in its original packaging.
Return procedure for RE46C107S16TF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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