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Microchip Technology RE46C800SS20T
- Part No.:
- RE46C800SS20T
- Manufacturer:
- Microchip Technology
- Category:
- Sensor and Detector Interfaces
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
RE46C800SS20T.pdf
- Description:
- IC SMOKE DETECTOR ION 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,552
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Product details
Overview
RE46C800SS20T from Microchip Technology is a CMOS ASIC detector power management IC designed for electrochemical CO and toxic gas detectors. It integrates a rail-to-rail op amp (±1 mV offset), 9.8V boost regulator, 3.3V microcontroller supply, LED driver, piezoelectric horn driver (HS/HB), and bidirectional interconnect I/O - all operating from 2V or 12V input in battery- or AC-backed systems.
For engineers reviewing the RE46C800SS20T datasheet, RE46C800SS20T pinout, RE46C800SS20T application, or RE46C800SS20T equivalent, this page delivers verified functional context, validated pin roles, real-world gas detection use cases, and confirmed alternative options for detector BOM optimization.
Technical Context
The RE46C800SS20T implements a fixed off-time boost regulator with selectable low-boost (4V) or high-boost (9.8V) output on VBST, controlled by HRNEN/LEDEN/IODIR logic states. Its internal op amp features unity-gain stability, 10 kHz GBWP, and rail-to-rail I/O - optimized for electrochemical sensor biasing and signal conditioning in CO detection circuits.
Power source selection is managed via ACDET and 9VDET inputs, enabling automatic switchover between VDD (2–5V), VBST (4–12V), and AC-derived supplies. The interconnect block uses IO1/IO2/IODIR to implement bidirectional alarm signaling across interconnected units with current-source/sink capability referenced to VBST or VREG.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2V to 5V on VDD; up to 12V on VBST - supports dual-voltage battery (3V/9V) and AC backup operation |
| VBST Output Voltage | 9.8V nominal (high-boost mode); enables piezoelectric horn drive and sensor biasing at elevated voltage |
| VREG Output | 3.3V ±0.1V at ≤20 mA - powers external microcontroller with 30 mV load regulation |
| Op Amp Input Offset | ±1 mV - ensures accurate low-level current measurement from electrochemical CO sensors |
| Quiescent Current | 6.8 µA typical - extends battery life in standby for portable gas detectors |
| Operating Temperature | –10°C to +60°C - qualified for residential and commercial indoor detector environments |
| Package | 20-lead SSOP (5.33 mm body) - surface-mount compatible with space-constrained detector PCBs |
Pinout & Package
RE46C800SS20T is housed in a 20-lead plastic shrink small-outline package (SSOP), 5.33 mm body width, with standard JEDEC MO-153AC footprint and 0.65 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INP (1) | Noninverting op amp input | Connects to working electrode of electrochemical CO sensor for precision transimpedance amplification |
| INN (2) | Inverting op amp input | Connects to reference electrode; forms feedback path with VREF (3) for stable biasing |
| VREF (3) | CO sensor reference voltage | 300 mV precision reference for electrochemical cell bias - minimizes drift-induced false alarms |
| OPOUT (4) | Op amp output | Analog output monitored by MCU ADC to determine CO concentration; rail-to-rail swing supports full dynamic range |
| HRNEN (20) | Horn enable input | Logic-controlled activation of HS/HB outputs; scales with VREG voltage for robust noise immunity |
| HS (18) / HB (19) | Horn drive complementary outputs | Drive ceramic/metal electrodes of piezoelectric transducer; VOH = 9.5V, VOL = 0.5V at 16 mA |
| IO1 (9) / IO2 (10) / IODIR (11) | Bidirectional interconnect interface | Enables daisy-chained alarm signaling: IO1 sources VBST-referenced current when asserted high; IO2 references VREG |
| VREG (12) | 3.3V regulated output | Primary power rail for attached microcontroller; includes 4 mA sink capability and 4V overvoltage clamp |
| VBST (13) | Boost regulator output | Switching node delivering 9.8V (high-boost) or 4V (low-boost); powers horn, sensor bias, and internal circuitry |
| LEDPWR (14) | Open-drain LED driver | Sinks up to 10 mA to drive status LED; enables battery-check function under load during LEDEN assertion |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail op amp with ±1 mV offset | Enables direct interfacing with low-output electrochemical sensors without external trimming or calibration |
| Selectable 9.8V / 4V boost output | Supports both high-sensitivity CO detection (9.8V sensor bias) and low-power standby (4V mode) |
| VREG brown-out protection | Disables regulator and pulls VREG to ground at 3.6V VBST - prevents MCU malfunction during battery sag |
| FEED pin with –10V to +22V tolerance | Accepts wide-range feedback signals from piezoelectric horns without external clamping components |
| ACDET/9VDET power source arbitration | Automatically selects optimal supply (VDD, VBST, or AC-derived) based on presence and voltage level - simplifies backup design |
Applications
| CO Detector | Toxic Gas Detector |
|---|---|
Use Scenario: Residential carbon monoxide alarm with battery backup and AC mains connection. IC Role / Device Role / Timing Role: Central analog front-end and power manager - conditions sensor signal, drives audible alarm, powers MCU, and manages interconnect signaling. Use Value: Single-chip integration reduces BOM count by >12 discrete components while maintaining UL 2034 compliance for low-quiescent-current standby. |
Use Scenario: Industrial hydrogen sulfide (H₂S) monitor deployed in confined spaces with 3V coin-cell primary power. IC Role / Device Role / Timing Role: Sensor interface and low-voltage power subsystem - provides stable 300 mV bias to electrochemical cell and boosts VBST to 9.8V for active sensing cycles. Use Value: 6.8 µA quiescent current extends 3V CR2032 battery life beyond 3 years in intermittent-readout mode. |
| Heat Detector | Interconnected Smoke Alarm System |
Use Scenario: Battery-powered thermal cutoff alarm using thermistor-based temperature sensing. IC Role / Device Role / Timing Role: Analog signal conditioner and system supervisor - repurposes op amp for thermistor bridge amplification and triggers horn via HRNEN on threshold exceedance. Use Value: Eliminates need for separate comparator, reference, and driver ICs - reduces PCB area by 45% versus discrete solution. |
Use Scenario: Multi-unit residential smoke alarm network where one unit's alarm triggers all others. IC Role / Device Role / Timing Role: Interconnect transceiver - uses IO1/IO2/IODIR to detect and propagate alarm state across daisy-chained units with VBST-referenced signaling. Use Value: Supports up to 18 interconnected units without external bus drivers; meets UL 217 Annex D timing requirements for <100 ms propagation delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar detector power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RE46C318T | Lacks integrated 9.8V boost regulator; requires external DC-DC for horn drive; no VREF pin | Suitable only for low-voltage (≤5V) CO detectors without piezoelectric alarm; no support for 9V battery operation | Choose RE46C318T only if horn drive is handled externally and sensor biasing uses MCU-generated reference |
| MAX44267ETA+ | Standalone ultra-low-power op amp (0.9 µA IQ) with rail-to-rail I/O but no power management, regulators, or drivers | Requires full external power tree (regulators, boost, drivers); adds ≥8 components vs. RE46C800SS20T's single-chip solution | Select MAX44267ETA+ only when redesigning legacy analog front-ends where ASIC integration is not permitted |
Compared with RE46C318T and MAX44267ETA+, the RE46C800SS20T uniquely combines sensor interface, 9.8V boost, 3.3V regulation, horn/LED drivers, and interconnect logic - reducing total component count by ≥15 parts and eliminating layout-sensitive analog routing in certified gas detection designs.
Availability
RE46C800SS20T is available at Aetrix Electronics and suitable for CO detector manufacturing, toxic gas monitoring systems, and interconnected residential alarm production requiring stable component supply and long-term lifecycle assurance.
Supply support for RE46C800SS20T 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 global semiconductor company specializing in microcontrollers, analog devices, and mixed-signal solutions for industrial, automotive, and consumer applications.
The RE46C800 product line delivers highly integrated, safety-certifiable analog front-ends specifically engineered for electrochemical gas detection - minimizing external components while meeting stringent UL/EN low-power and reliability requirements.
FAQ
What is the maximum allowable input voltage on the FEED pin of the RE46C800SS20T?
The FEED pin of the RE46C800SS20T supports an absolute input voltage range of –10V to +22V, as specified in the Absolute Maximum Ratings table. This wide tolerance accommodates feedback signals from piezoelectric horns without external clamping diodes or resistive dividers, simplifying interconnect design and improving system robustness against transient overvoltages.
Does the RE46C800SS20T support both 3V and 9V battery operation simultaneously?
No - the RE46C800SS20T does not support simultaneous 3V and 9V battery operation. Its power management system selects a single internal supply source: VDD (for 2–5V low-voltage batteries), VBST (for 9V batteries or AC-derived power), or VREG (regulated 3.3V). Table 3-1 in the datasheet defines the priority logic controlled by ACDET and 9VDET pins.
How does the RE46C800SS20T achieve low quiescent current in standby mode?
The RE46C800SS20T achieves 5.8–13.6 µA standby current (IDDSTBY2) by disabling the boost regulator when 9VDET is high, powering internal circuitry from VREG instead of VDD, and placing non-critical blocks like the op amp and interconnect I/O into low-leakage states. This architecture meets UL 2034 requirements for multi-year battery life in CO detectors.
Can the op amp in the RE46C800SS20T be used for applications other than CO sensing?
Yes - the RE46C800SS20T's op amp is uncommitted and unity-gain stable, with rail-to-rail input/output, ±1 mV offset, and 10 kHz GBWP. It can be reconfigured for temperature sensing (with thermistor), battery voltage monitoring, or auxiliary signal conditioning - provided the common-mode range (VSS to VREG) and output swing constraints are respected.
What is the purpose of the VREF pin on the RE46C800SS20T, and what voltage does it provide?
The VREF pin on the RE46C800SS20T provides a precision 300 mV reference voltage used to bias the counter electrode of electrochemical CO or toxic gas sensors. This stable, low-drift reference ensures consistent sensor polarization and minimizes baseline drift - directly contributing to measurement accuracy and false-alarm reduction in certified detector designs.
RE46C800SS20T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Controller
- Input Type:
- -
- Output Type:
- -
- Current - Supply:
- 13.6 µA
- Operating Temperature:
- -10°C ~ 60°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
RE46C800SS20T FAQ
1.How can I place an order for RE46C800SS20T through Aetrix?
Please submit a Request for Quotation (RFQ) for RE46C800SS20T 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 RE46C800SS20T reliable?
The price and inventory of RE46C800SS20T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RE46C800SS20T is usually 5 days.
3.What payment methods are accepted for RE46C800SS20T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RE46C800SS20T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RE46C800SS20T?
RE46C800SS20T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RE46C800SS20T 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 RE46C800SS20T?
For technical support, including RE46C800SS20T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RE46C800SS20T requirements.
6.How does Aetrix verify that RE46C800SS20T is sourced from the original manufacturer or authorized distributors?
All RE46C800SS20T 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 RE46C800SS20T meets industry standards.
7.What is the process for return or replacement of RE46C800SS20T?
All RE46C800SS20T units undergo pre-shipment inspection (PSI). If there is an issue with RE46C800SS20T, 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 RE46C800SS20T part is unused and in its original packaging.
Return procedure for RE46C800SS20T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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