My Inquiry
My Account
Microchip Technology RE46C190S16F
- Part No.:
- RE46C190S16F
- Manufacturer:
- Microchip Technology
- Category:
- Sensor and Detector Interfaces
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
RE46C190S16F.pdf
- Description:
- IC PHOTOELECTR SMOKE DET 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:490
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
RE46C190S16F from Microchip Technology is a low-power, low-voltage CMOS photoelectric smoke detector ASIC with integrated IRED driver, interconnect capability, and 9-minute hush timer. It operates from two AA batteries (2–5 V), consumes only 1 µA standby current, supports NFPA 72 temporal horn pattern, and integrates all core functions for UL217/UL268-compliant smoke detectors.
For engineers reviewing the RE46C190S16F datasheet, RE46C190S16F pinout, RE46C190S16F application, or RE46C190S16F equivalent, this page delivers verified specifications, validated SOIC-16 pin mapping, real-world smoke detection timing behavior, and confirmed alternatives for UL-certified residential/commercial fire safety systems.
Technical Context
The RE46C190S16F implements a gain-selectable photo amplifier with programmable integration time (100–400 µs) and four user-configurable detection limits (Normal/Hysteresis, Hush, Chamber Test). Its internal oscillator triggers smoke sampling every 10 seconds in standby, increasing frequency upon detection to confirm alarm conditions.
It features dual-mode DC-DC boost control: Low Boost (3.6 V) for chamber testing and High Boost (9.6 V) for horn drive; includes programmable IRED sink current (50–200 mA), adjustable hush sensitivity, and bidirectional IO pin with 1.31 s charge-dump duration and 313 ms digital filter for cross-device interconnect compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2–5.0 V - Supports two AA alkaline cells across full discharge curve; enables direct battery operation without regulator. |
| Standby Current | 1 µA typical - Minimizes battery drain during 10-second sampling intervals; extends detector service life beyond 10 years. |
| IRED Drive Current | 50–200 mA (programmable) - Configurable optical pulse strength to match chamber geometry and ambient light rejection requirements. |
| Horn Drive Voltage | 9.6 V nominal (VBST) - High-boost output ensures consistent piezoelectric transducer audibility over battery lifetime. |
| Interconnect Delay | 1.00 s typical (temporal mode) - Enables reliable multi-unit alarm propagation while rejecting noise from CO or heat detectors. |
| Low Battery Threshold | 2.1–2.8 V (8 options, 100 mV steps) - Programmable trip point aligns with battery chemistry and aging profile for accurate EOL warning. |
| Operating Temp | –10°C to +60°C - Validated for indoor residential and commercial ceiling-mounted installation environments. |
Pinout & Package
RE46C190S16F is housed in a 16-lead narrow SOIC (150 mil) package with θJA = 86.1°C/W thermal resistance, optimized for surface-mount assembly in compact smoke detector PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS (1) | Negative supply reference | Ground return path for all analog/digital blocks; requires low-impedance connection to battery negative. |
| IRED (2) | Programmable IRED sink | Drives infrared emitter diode with pulsed current (50–200 mA); timing and amplitude configurable via EEPROM. |
| VDD (3) | Primary power input | Accepts 2–5 V battery supply; powers logic, oscillator, and low-current peripherals; monitored for low-battery detection. |
| TEST (4) | Mode control input | Pull-down enabled; initiates push-to-test, hush, and timer modes; high-level pulse triggers chamber test sequence. |
| TEST2 (5) | Programming enable | Must be held at VDD to enter calibration/test modes; reconfigures FEED/IO/RLED/GLED/HB for programming interface. |
| IRP (6) | Photo diode anode | Connects to photodiode anode; forms front-end of gain-selectable transimpedance amplifier for smoke particle scattering detection. |
| IRN (7) | Photo diode cathode | Connects to photodiode cathode; differential input pair with IRP enables background light rejection and signal integrity. |
| RLED (8) | Red LED driver (open-drain) | Indicates alarm, low battery, and hush status; sinks up to 10 mA; used for loaded battery voltage sampling during supervision. |
| GLED (9) | Green LED driver (open-drain) | Latches local alarm memory; flashes three times per 43 s cycle for 24 hours after alarm exit; indicates prior alarm event. |
| FEED (10) | Feedback electrode input | Optional connection to feedback electrode; if unused, must be tied to VDD or VSS; supports chamber integrity monitoring. |
| IRCAP (11) | IRED capacitor charge node | Charges from VBST to enable high-current IRED pulses; turn-on/off thresholds (4.0–4.8 V) define pulse timing window. |
| IO (12) | Bidirectional interconnect | Drives high-boost voltage during local alarm; senses remote alarms; includes 1.31 s charge dump and 313 ms digital filter. |
| HB (13) | Horn metal electrode | Drives piezoelectric transducer metal side; outputs temporal (500 ms on/off) or continuous (250 ms on) horn patterns per NFPA 72. |
| HS (14) | Horn ceramic electrode | Complementary output to HB; completes piezo drive circuit; enables balanced acoustic output and reduced EMI. |
| VBST (15) | Boost converter output | Regulated 9.6 V (high boost) or 3.6 V (low boost); powers horn, IRED, and RLED; sourced from LX switching node. |
| LX (16) | Boost inductor switch | Open-drain NMOS output driving external inductor; peak current >1.5 A; requires low-resistance path to battery positive. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated IRED driver | Eliminates external transistor and current-setting resistor; reduces BOM count and layout area in space-constrained detectors. |
| Programmable hush timer | 9-minute Reduced Sensitivity mode suppresses nuisance alarms while maintaining responsiveness to high-smoke events. |
| UL217/UL268 compliance support | Includes NFPA 72 temporal horn pattern, chamber self-test, low-battery supervision, and end-of-life indicator per certification requirements. |
| Local alarm memory | GLED visual latching identifies units that previously triggered local alarm-critical for post-event forensic inspection in multi-unit installations. |
| Interconnect scalability | Supports up to 40 interconnected detectors with automatic alarm propagation and noise-immune digital filtering on IO pin. |
Applications
| Residential Smoke Alarms | Commercial Ceiling-Mounted Detectors |
|---|---|
|
Use Scenario: Standalone or interconnected smoke alarms installed in bedrooms, hallways, and living areas of single-family homes. IC Role / Device Role / Timing Role: Primary smoke sensing ASIC performing periodic optical chamber sampling, low-battery supervision, and temporal horn generation. Use Value: 1 µA standby current enables 10+ year battery life; programmable IRED current optimizes detection for varying chamber geometries and dust accumulation. |
Use Scenario: Hardwired or battery-backed smoke detectors deployed in office buildings, hotels, and schools with centralized alarm panels. IC Role / Device Role / Timing Role: Interconnected alarm node executing synchronized local/remote alarm response via IO pin with 1.00 s propagation delay. Use Value: Bidirectional IO pin with 313 ms digital filter ensures reliable interoperability with CO and heat detectors using pulsed interconnect signals. |
| Multi-Unit Interconnected Systems | UL-Certified Retrofit Detectors |
|
Use Scenario: Up to 40 detectors wired in parallel to share alarm state across apartments, hotel rooms, or dormitory suites. IC Role / Device Role / Timing Role: Distributed alarm controller managing local alarm initiation, interconnect signaling, and hush coordination across networked units. Use Value: Charge-dump function (1.31 s) rapidly discharges interconnect line capacitance, enabling fast reset and preventing false triggering after alarm clears. |
Use Scenario: Replacement smoke detectors meeting UL217 8th edition requirements for existing residential installations. IC Role / Device Role / Timing Role: Certified smoke sensing engine delivering calibrated photo detection, chamber integrity verification, and 2% low-battery set point. Use Value: Factory-programmable detection limits and gain factors allow precise calibration to meet UL sensitivity tolerances without custom hardware revisions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar photoelectric smoke detector ASIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RE46C191 | Improved version with enhanced long-term drift compensation, updated EEPROM programming interface, and extended qualification for 10-year detector lifetime (LTD). | Required for new designs targeting UL217 9th edition and 10-year sealed battery certifications. | Select RE46C191 for all new designs; RE46C190S16F remains valid for legacy replacement and non-LTD applications. |
| SM5420C | Single-chip solution integrating MCU, ADC, and smoke algorithm; lacks native IRED driver and interconnect logic; requires external MOSFET for horn drive. | Suitable for cost-sensitive, lower-volume detectors where firmware flexibility outweighs analog integration benefits. | Choose SM5420C only when programmable smoke algorithms and OTA updates are prioritized over analog signal chain optimization. |
Compared with RE46C190S16F, RE46C191 offers mandatory LTD support and improved chamber stability, while SM5420C trades analog integration for software-defined detection-making RE46C190S16F optimal for high-reliability, analog-optimized UL217/UL268 implementations.
Availability
RE46C190S16F is available at Aetrix Electronics and suitable for residential fire alarm systems, commercial interconnected detector networks, and UL217-certified retrofit installations requiring stable component supply and long-lifecycle support.
Supply support for RE46C190S16F 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 is a global semiconductor company specializing in microcontrollers, analog devices, and timing solutions for industrial, automotive, and consumer applications.
The RE46C190S16F belongs to Microchip's dedicated smoke detector ASIC product line, engineered specifically to integrate photoelectric sensing, battery management, and interconnect logic into a single UL217/UL268-compliant device for life-safety systems.
FAQ
What is the operating voltage range for the RE46C190S16F?
The RE46C190S16F operates from 2.0 V to 5.0 V, enabling direct two-AA-battery operation across the full discharge curve. Its internal low-battery comparator supports eight programmable trip points (2.1–2.8 V in 100 mV steps), and the device maintains functional accuracy down to 2.0 V during alarm activation. This wide input range ensures reliable performance throughout battery life without external regulation.
How does the RE46C190S16F implement smoke detection timing and sensitivity control?
The RE46C190S16F uses a trimmed internal oscillator to sample the smoke chamber every 10 seconds in standby mode, with each sampling period lasting 10 ms. During sampling, it delivers a programmable 100–400 µs IRED pulse and integrates photodiode current using one of four gain settings (GF = 1–4). Three consecutive detections above the Normal/Hysteresis limit trigger alarm; Reduced Sensitivity (Hush) and Chamber Test modes use separate, independently programmable limits.
What are the key differences between RE46C190S16F and RE46C191?
The RE46C191 is Microchip's designated successor to the RE46C190S16F, featuring enhanced long-term drift compensation, updated EEPROM programming architecture, and formal qualification for 10-year detector lifetime (LTD) per UL217 9th edition. While pin-compatible and functionally similar, RE46C191 adds improved chamber stability and is recommended for all new designs-whereas RE46C190S16F remains supported for legacy replacements and non-LTD applications.
Can the RE46C190S16F drive a piezoelectric horn directly?
Yes-the RE46C190S16F drives piezoelectric horns directly via complementary outputs HB (metal electrode) and HS (ceramic electrode), supporting both NFPA 72 temporal (500 ms on/off) and continuous (250 ms on) patterns. Its internal DC-DC boost converter delivers regulated 9.6 V (VBST) to ensure consistent sound pressure level across battery voltage decay, eliminating need for external high-voltage drivers.
How does the interconnect functionality work on the RE46C190S16F?
The RE46C190S16F uses its bidirectional IO pin to interconnect up to 40 detectors. During local alarm, IO drives high-boost voltage immediately; remote alarms are detected via active-high signals with 336 ms digital filtering. After alarm ends, a 1.31 s charge-dump cycle discharges line capacitance. The design supports mixed-alarm systems (e.g., CO + smoke) and complies with UL217 interconnect timing requirements.
RE46C190S16F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Smoke Detector
- Input Type:
- Photoelectric
- Output Type:
- Voltage
- Current - Supply:
- 1 µA
- Operating Temperature:
- -10°C ~ 60°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
RE46C190S16F FAQ
1.How can I place an order for RE46C190S16F through Aetrix?
Please submit a Request for Quotation (RFQ) for RE46C190S16F 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 RE46C190S16F reliable?
The price and inventory of RE46C190S16F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RE46C190S16F is usually 5 days.
3.What payment methods are accepted for RE46C190S16F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RE46C190S16F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RE46C190S16F?
RE46C190S16F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RE46C190S16F 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 RE46C190S16F?
For technical support, including RE46C190S16F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RE46C190S16F requirements.
6.How does Aetrix verify that RE46C190S16F is sourced from the original manufacturer or authorized distributors?
All RE46C190S16F 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 RE46C190S16F meets industry standards.
7.What is the process for return or replacement of RE46C190S16F?
All RE46C190S16F units undergo pre-shipment inspection (PSI). If there is an issue with RE46C190S16F, 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 RE46C190S16F part is unused and in its original packaging.
Return procedure for RE46C190S16F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RE46C190S16F 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…
