BA45FH0082 - 8-bit Fire Protection Flash MCU | Holtek
MPN: BA45FH0082 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.65 | $0.65 |
| 10 | $0.58 | $5.80 |
| 100 | $0.52 | $52.00 |
| 500 | $0.46 | $230.00 |
| 1,000 | $0.39 | $390.00 |
BA45FH0082 Overview
An 8-bit Flash MCU is a complete self-contained computing system that integrates a processor core, program memory, data memory, and peripheral functions such as timers, ADCs and serial communication interfaces on a single chip. Within the embedded systems hierarchy, the BA45FH0082 sits in the application-specific MCU segment, positioned between general-purpose 8-bit MCUs and dedicated ASIC fire-detection ICs, offering the flexibility of Flash reprogramming with detection-optimized peripherals.
Key features of the BA45FH0082 include a wide 2.2V~5.5V operating voltage range that supports both battery-powered smoke alarm nodes and 5V industrial panels, 2KB of Flash program memory for application firmware with in-circuit reprogrammability, 128B of RAM for working data, and a 12-bit A/D converter suitable for sensor signal acquisition. According to Holtek documentation, the device architecture is a high-performance RISC core designed specifically for fire protection peripherals with networking capability.
Technically, the RISC architecture delivers efficient one-cycle instruction execution for most instructions, while the integrated Flash memory removes the lead-time and inventory constraints of mask ROM devices. The device is RoHS compliant, supporting lead-free assembly processes.
Typical applications include networked smoke and heat alarm systems, fire protection peripheral control nodes, sensor polling units in addressable fire alarm loops, and battery-operated detection devices where the wide voltage range extends operating life.
Design consideration: because the device is in End-of-Life, designs should evaluate Holtek's officially recommended replacement device referenced in the EOL notification before new layouts are committed.
This page synthesizes distributor pricing, EOL lifecycle data, and drop-in alternative analysis not found in the manufacturer datasheet.
Drop-in alternatives for BA45FH0082 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with BA45FH0082 (same form factor and footprint) — differing in Core Architecture, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BA45F0082
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.25 / Unit
View Datasheet →[DATA_NEEDED: Holtek EOL replacement MPN]
✅ Drop-In📋 Reference alternative (not in catalog)
BA45FH0082 Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit high-performance RISC |
| Program Memory | 2 KB Flash |
| RAM | 128 B |
| ADC Resolution | 12-bit |
| Operating Voltage | 2.2 V to 5.5 V |
| Application Domain | Networking fire protection peripherals |
| Package | SSOP-20 (150mil) |
| Mounting Type | Surface Mount |
| Memory Type | Flash |
| Minimum Operating Voltage | 2.2 V |
| Maximum Operating Voltage | 5.5 V |
| RoHS Status | Compliant |
| Lifecycle Status | End of Life (last order date December 25, 2025) |
BA45FH0082 ssop-20 (150mil) Pin Configuration Guide
Pin configuration for BA45FH0082 (ssop-20 (150mil) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for BA45FH0082.
Refer to the datasheet for full pin configuration.
Typical Applications
BA45FH0082 is suitable for 6 applications: Networked Smoke Alarm Systems, Fire Protection Peripheral Control Nodes, Addressable Fire Alarm Loop Devices, Battery-Operated Detection Devices, Industrial Fire and Safety Monitoring, IoT Fire Safety Sensor Endpoints.
Networked Smoke Alarm Systems
The BA45FH0082 is purpose-designed for networking-type fire protection peripheral products, making it a natural controller for interconnected smoke alarm nodes. Its 12-bit ADC digitizes smoke chamber sensor outputs with fine resolution for accurate threshold detection, while the 8-bit RISC core executes detection and communication algorithms efficiently. The wide 2.2V~5.5V supply range allows direct operation from lithium or alkaline batteries without a regulator, extending operational life in always-on monitoring duty. The 2KB Flash memory stores detection firmware with reprogrammability for calibration updates during production. In a typical topology, the MCU polls the sensor front-end, applies smoke-logic to the ADC readings, and drives the local sounder while exchanging status messages over the alarm network bus.
Recommended
Fire Protection Peripheral Control Nodes
Fire protection peripheral products such as manual call points, sounder controllers, and interface modules benefit from the BA45FH0082's integrated peripheral set and 2.2V~5.5V operation. The 128B RAM supports message buffering for networked alarm communication, and the 12-bit ADC enables monitoring of line voltage, loop current and auxiliary sensors for fault supervision. Flash program memory allows manufacturers to update firmware for changing certification or protocol requirements without changing hardware, an advantage over mask ROM alternatives. In these nodes, the MCU manages input monitoring, output actuation of sounders or relays, and periodic heartbeat reporting to the fire panel, with the RISC architecture providing deterministic response timing essential for alarm-latency compliance.
Recommended
Addressable Fire Alarm Loop Devices
Addressable fire alarm systems assign a unique identity to each loop device, and the BA45FH0082 provides the processing to decode polling commands and encode replies on addressable loops. Its 12-bit ADC measures analog loop signals for device diagnostics, and the 2.2V~5.5V operating range tolerates the voltage variation typical of powered loop topologies. The 2KB Flash holds both the communication stack and the device application logic, and the 150mil SSOP-20 footprint keeps the controller compact inside miniature detector bases and module housings. Because the device is EOL with a December 25, 2025 last purchase date, new addressable loop designs should evaluate Holtek's officially recommended replacement device from the EOL notification to secure long-term supply.
Recommended
Battery-Operated Detection Devices
Standalone battery-powered detectors, including smoke, heat, and gas detection units, exploit the BA45FH0082's low minimum supply voltage of 2.2V, which allows operation down to near-depleted battery levels for maximum service life. The 12-bit ADC converts thermistor and electrochemical sensor signals with sufficient accuracy for regulatory detection thresholds, and low-power operating modes typical of the BA45F family minimize average current in periodic wake-up sampling schemes. The 8-bit RISC core starts quickly and executes supervisory loops with predictable timing, while the SSOP-20 package fits the compact PCBs of consumer detector housings. Firmware stored in Flash simplifies per-model calibration data management across product families sharing a single PCB platform.
Recommended
Industrial Fire and Safety Monitoring
In industrial safety panels and monitoring equipment, the BA45FH0082 serves as an acquisition and supervision controller for distributed sensors. Its 5.5V maximum supply permits direct connection to 5V industrial logic rails, simplifying integration with legacy panel electronics, while the 12-bit ADC resolves sensor drift and line-fault conditions that maintenance systems must report. Flash memory supports field firmware updates during equipment service intervals, reducing the cost of compliance-driven feature changes. The MCU can scan multiple analog inputs, apply alarm and pre-alarm threshold logic, and drive local annunciators or communication transceivers. Given the announced EOL, industrial equipment makers should secure last-time-buy inventory or migrate to the Holtek-recommended replacement identified in the official EOL cross-reference.
Recommended
IoT Fire Safety Sensor Endpoints
Modern fire safety deployments increasingly connect detectors to IoT gateways, and the BA45FH0082 functions as the local sensor-processing endpoint feeding such gateways. The 12-bit ADC digitizes sensor front-ends, the RISC core performs local detection logic so only event summaries travel upstream, and the 2.2V low-voltage operation supports energy-harvesting or primary-cell powered endpoints. Flash reprogrammability lets integrators adapt reporting formats and thresholds to different gateway protocols without hardware change. The SSOP-20-150mil surface-mount package suits compact wireless node PCBs where a separate radio module provides connectivity. Note that as the device is End-of-Life per Holtek's December 25, 2025 notification, new IoT endpoint designs should target the officially recommended successor device.
Recommended
Engineering reference data for BA45FH0082 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BA45F0082 | [DATA_NEEDED: Holtek EOL replacement MPN] |
|---|---|---|---|
| Brand | Holtek Semiconductor | Holtek Semiconductor | Holtek Semiconductor |
| Lifecycle Status | EOL (last order December 25, 2025) | EOL (same notification) | Active (recommended successor) |
Key Differentiators
- Flash program memory enables firmware updates (vs BA45F0082)
- Fire-protection-specific peripheral integration (vs Generic 8-bit MCUs)
- Lifecycle trade-off (vs BA45F0082)
Design Notes
The BA45FH0082 is officially End-of-Life: Holtek's EOL notification sets the last purchase date at December 25, 2025. Never commit a new PCB design to this MPN without first reading the official replacement cross reference in EOL_BA45F0082_FH0082.pdf on holtek.com. For products in sustained production, secure last-time-buy quantities now or plan firmware-compatible migration to the recommended successor, since residual distributor stock (LCSC from $0.3857 as of 2026-10-11) will not be replenished.
The 2.2V~5.5V operating range allows direct battery connection, but sensor accuracy of the 12-bit ADC depends on a stable reference. In battery detector designs, use ratiometric measurement against the supply reference where possible, and place a 0.1uF ceramic decoupling capacitor directly at the VDD pin with a low-ESR bulk capacitor nearby. Verify brown-out reset behavior at the lowest expected battery voltage so the MCU does not execute detection logic from corrupted state during cold-cell discharge transients.
Use the SSOP-20 150mil footprint exactly as dimensioned in the Holtek datasheet pin assignment drawing (the datasheet includes a dedicated Pin Assignment section). Keep the analog sensor traces to the ADC inputs short and away from sounder or relay drive lines to prevent false alarms from switching transients. If migrating later to the EOL successor device, design the footprint to accommodate both pinouts where the cross-reference permits, preserving PCB reuse across the transition.
Compliance Information
RoHS compliance stated by LCSC and JLCPCB product listings. REACH, lead-free, halogen-free and conflict-minerals status not stated in the provided data.
