My Inquiry
My Account
Microchip Technology RE46C317S8F
- Part No.:
- RE46C317S8F
- Manufacturer:
- Microchip Technology
- Category:
- Sensor and Detector Interfaces
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
RE46C317S8F.pdf
- Description:
- IC DRIVER HORN PIEZO W/BO 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,278
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
RE46C317S8F from Microchip Technology is a CMOS piezoelectric horn driver IC with integrated 10V boost converter, designed for 3V battery-powered smoke and CO detectors. It features tri-state Horn Enable (HRNEN), 0.5µA standby current, 10V VO output at 10mA load, and low 0.3V output saturation on HORNB/HORNS pins.
For engineers reviewing the RE46C317S8F datasheet, RE46C317S8F pinout, RE46C317S8F application, or RE46C317S8F equivalent, this device supports ultra-low-power alarm systems requiring fast horn turn-on after boost stabilization, precise piezo transducer drive, and compatibility with legacy RE46C117 designs.
Technical Context
The RE46C317S8F integrates a current-mode boost regulator with cycle-by-cycle current limiting and outer-loop voltage control to deliver stable 10V output from 2–5V input. Its tri-state HRNEN logic enables three operational modes: standby (disabled), boost-only (VO active, horn off), and normal operation (VO + horn active).
It drives three-terminal piezoelectric horns via complementary HORNB (brass electrode) and HORNS (silver electrode) outputs with 0.3V low-level saturation and 9.7V high-level drive at 16mA, while FEED pin monitors horn feedback for fault detection or resonance tuning in safety-critical audible alarms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2V to 5V - supports single 3V alkaline or lithium coin cell operation with headroom down to 2V under aging/battery depletion. |
| Standby Supply Current | 0.5 µA typical - enables multi-year battery life in smoke/CO detectors during quiescent monitoring phase. |
| Boost Output Voltage | 10V ±1V at 10mA - provides sufficient drive voltage for high-sound-pressure piezoelectric horns requiring >9V bias. |
| Horn Output Saturation | 0.3V max at –16mA - ensures minimal power loss and thermal rise in HORNB/HORNS drivers during sustained alarm tone. |
| Operating Temperature | –10°C to +60°C - validated for residential indoor environments including attic or basement detector installations. |
| Horn Turn-On Delay | <1 ms after VO reaches 10V - guarantees rapid audible response once boost regulation stabilizes, critical for life-safety timing. |
| ESD Rating | 1500V HBM - meets industrial handling requirements for assembly and field service without special ESD controls. |
Pinout & Package
RE46C317S8F is housed in an 8-lead SOIC (3.90 mm body width) package with Pb-free matte tin finish, optimized for automated PCB assembly and space-constrained detector modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FEED | Horn feedback input | Connects to piezo transducer feedback electrode via current-limiting resistor; enables resonance monitoring or open-circuit detection. |
| 2 VDD | Positive supply | Accepts 2–5V DC input; powers internal logic, boost controller, and horn driver stages. |
| 3 LX | Boost switch node | Drives external inductor (10 µH); NMOS open-drain output with 1A peak current capability for efficient energy transfer. |
| 4 VSS | Negative supply ground | System reference return; must be low-impedance path to minimize noise coupling into sensitive analog blocks. |
| 5 VO | Boost output | Regulated 10V supply for horn driver stage; requires 10 µF low-ESR capacitor for ripple suppression. |
| 6 HORNB | Horn brass electrode output | Push-pull driver output connected to metal electrode of piezo transducer; sinks up to 16mA. |
| 7 HORNS | Horn silver electrode output | Complementary push-pull driver output connected to ceramic electrode; sources up to 16mA. |
| 8 HRNEN | Horn enable control | Tri-state logic input: float = standby (0.5µA), low = boost-only, high = full operation (horn + boost). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 10V boost converter | Eliminates need for external DC-DC IC or transformer-based high-voltage generation in compact detector PCBs. |
| Tri-state HRNEN interface | Enables battery health check (boost-only mode) without triggering alarm, reducing false positives during self-test routines. |
| Low 0.5µA standby current | Extends shelf life and field service interval in UL-listed smoke/CO detectors where regulatory compliance mandates multi-year operation. |
| Piezoelectric horn optimization | Complementary HORNB/HORNS outputs deliver balanced AC drive waveform to maximize sound pressure output and minimize mechanical stress. |
| RE46C117 compatibility | Direct drop-in replacement with identical pinout and function, enabling upgrade to lower standby current without layout changes. |
Applications
| Smoke Detectors | CO Detectors |
|---|---|
Use Scenario: Battery-powered residential ceiling-mounted smoke alarm with periodic self-test and audible alert on ionization chamber trigger. IC Role / Device Role / Timing Role: Piezo horn driver and high-voltage booster providing regulated 10V rail and synchronized dual-phase drive to generate 3kHz alarm tone. Use Value: 0.5µA standby current enables >5-year battery life; tri-state HRNEN allows safe self-test without nuisance alarm activation. |
Use Scenario: Portable battery-operated carbon monoxide detector with low-power sensor interface and loud audible warning at 70ppm threshold. IC Role / Device Role / Timing Role: High-efficiency boost converter and horn driver delivering consistent acoustic output across battery voltage range (2.0–3.2V). Use Value: 10V VO output ensures full sound pressure level (≥85dB) even at end-of-battery-life; FEED pin supports open-horn fault detection. |
| Personal Security Products | Electronic Toys |
Use Scenario: Keychain panic alarm with momentary push-button activation and piercing 105dB siren output. IC Role / Device Role / Timing Role: Low-quiescent-current horn driver enabling always-on readiness; fast <1ms horn enable after boost stabilization. Use Value: Tri-state HRNEN prevents accidental activation during storage; 0.3V output saturation minimizes heat buildup during extended siren bursts. |
Use Scenario: Educational STEM toy with programmable sound effects driven by microcontroller GPIO and powered by two AAA cells. IC Role / Device Role / Timing Role: Compact piezo driver enabling crisp, high-fidelity tones without external voltage rails or discrete transistors. Use Value: SOIC-8 footprint simplifies hand-soldering and prototyping; compatibility with RE46C117 allows reuse of existing reference designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar piezoelectric horn driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RE46C318S8F | Binary HRNEN (low/high only); 0.1µA standby current; no tri-state mode. | Lacks boost-only diagnostic mode; suited for simpler alarm systems without self-test requirements. | Select when lowest possible standby current is prioritized over functional flexibility. |
| RE46C117S8F | Higher 1µA standby current; same pinout and tri-state HRNEN functionality. | Legacy part with identical application coverage but reduced battery lifetime in long-duration deployments. | Choose for backward compatibility where RE46C317S8F is unavailable or cost-sensitive. |
Compared with RE46C318S8F, RE46C317S8F adds diagnostic capability via tri-state HRNEN at the cost of slightly higher standby current; versus RE46C117S8F, it delivers 5× lower quiescent draw while maintaining full functional equivalence and drop-in replaceability.
Availability
RE46C317S8F is available at Aetrix Electronics and suitable for smoke detectors, CO detectors, and personal security products requiring stable component supply, long-term lifecycle support, and UL/EN compliance traceability.
Supply support for RE46C317S8F 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 manufacturer specializing in microcontrollers, analog devices, and timing solutions for industrial, automotive, and consumer applications.
The RE46C317S8F belongs to Microchip's dedicated piezoelectric alarm driver product line, engineered specifically for battery-powered life-safety and security audible notification systems with stringent low-power and reliability requirements.
FAQ
What is the maximum operating temperature for the RE46C317S8F?
The RE46C317S8F is specified for continuous operation from –10°C to +60°C. This range covers typical residential and commercial indoor environments where smoke and CO detectors are deployed, including unconditioned spaces like attics or garages. Operation outside this range may affect VO regulation accuracy and horn drive strength.
Does the RE46C317S8F require external components to function?
Yes, the RE46C317S8F requires an external inductor (10 µH), Schottky diode (1A peak, <0.5V VF), two 10 µF low-ESR capacitors (input and VO), and a 1 nF capacitor on FEED. These components form the boost converter and horn feedback network; omission or substitution outside datasheet values will impair VO regulation or horn performance.
How does the tri-state HRNEN pin work on the RE46C317S8F?
On the RE46C317S8F, HRNEN has three valid states: floating (tri-state) disables both boost and horn for 0.5µA standby; logic low enables only the boost converter (VO = 10V) for battery voltage checking; logic high enables full operation with horn drive. This differs from the binary RE46C318S8F, which lacks the tri-state mode.
Can the RE46C317S8F drive a two-terminal piezoelectric horn?
Yes, the RE46C317S8F can drive modified two-terminal piezoelectric horns using HORNB and HORNS outputs in push-pull configuration. The datasheet confirms compatibility with "modified two-terminal Piezo horn" when one terminal is grounded and the other connected across HORNB–HORNS, leveraging the complementary drive architecture.
Is the RE46C317S8F pin-compatible with the RE46C117S8F?
Yes, the RE46C317S8F is fully pin-compatible and functionally compatible with the RE46C117S8F, sharing identical SOIC-8 pinout, tri-state HRNEN behavior, and application circuitry. It serves as a direct drop-in replacement offering 5× lower standby current (0.5µA vs. 1µA) without any PCB or firmware changes.
RE46C317S8F 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:
- Voltage
- Output Type:
- Voltage
- Current - Supply:
- 300 µA
- Operating Temperature:
- -10°C ~ 60°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
RE46C317S8F FAQ
1.How can I place an order for RE46C317S8F through Aetrix?
Please submit a Request for Quotation (RFQ) for RE46C317S8F 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 RE46C317S8F reliable?
The price and inventory of RE46C317S8F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RE46C317S8F is usually 5 days.
3.What payment methods are accepted for RE46C317S8F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RE46C317S8F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RE46C317S8F?
RE46C317S8F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RE46C317S8F 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 RE46C317S8F?
For technical support, including RE46C317S8F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RE46C317S8F requirements.
6.How does Aetrix verify that RE46C317S8F is sourced from the original manufacturer or authorized distributors?
All RE46C317S8F 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 RE46C317S8F meets industry standards.
7.What is the process for return or replacement of RE46C317S8F?
All RE46C317S8F units undergo pre-shipment inspection (PSI). If there is an issue with RE46C317S8F, 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 RE46C317S8F part is unused and in its original packaging.
Return procedure for RE46C317S8F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RE46C317S8F Tags
-
RE46C100S8TF
Microchip Technology
-
XTR111AIDRCR
Texas Instruments
-
XTR111AIDGQR
Texas Instruments
-
XTR117AIDGKR
Texas Instruments
-
XTR111AIDGQT
Texas Instruments
-
XTR115UA/2K5
Texas Instruments
-
MAX14626ETT+T
Analog Devices Inc./Maxim Integrated
-
XTR116UA/2K5
Texas Instruments
-
XTR115U/2K5
Texas Instruments
-
XTR116U/2K5
Texas Instruments
-
PGA308AIDGSR
Texas Instruments
-
XTR300AIRGWR
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
