BA45F0082 - Fire Protection Flash MCU | Holtek Semiconductor
MPN: BA45F0082 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.4 | $0.40 |
| 10 | $0.36 | $3.60 |
| 100 | $0.32 | $32.00 |
| 500 | $0.28 | $140.00 |
| 1,000 | $0.25 | $250.00 |
BA45F0082 Overview
A fire protection Flash MCU is a specialized class of 8-bit microcontroller (MCU) that combines a CPU core, program memory, RAM, peripheral circuits, and analog sensing blocks into a single semiconductor device optimized for smoke detector and fire alarm system nodes. Within the power management and sensing hierarchy of a fire alarm network, these devices sit between the physical smoke/optical sensing elements and the network communication transceiver, executing measurement, filtering, threshold comparison, and alarm signaling tasks.
Key features of the BA45F0082 include Flash program memory with multi-programming convenience for field updates and development iteration, a wide range of flexible peripheral functions suited to low-power battery-operated detector nodes, and an application-oriented architecture that reduces external component count in networking fire product peripherals. The device family also includes the BA45FH0082 variant and the BA45V0082 OCDS evaluation chip for in-circuit debugging.
Technical architecture is based on Holtek's 8-bit high performance RISC core, which provides fast, compact instruction execution typical of Holtek's BA45 series. Analog-to-digital conversion and digital control functions are integrated on-chip, allowing the detector signal chain to be implemented largely within the MCU. The 111-page manufacturer datasheet (revision V1.10, November 19, 2019) documents the complete register set, electrical characteristics, and package information.
Typical applications include networking fire alarm peripheral modules, smoke detector sensor nodes, and fire protection control interfaces where Flash reprogrammability and integrated analog sensing reduce board cost and development time. Distribution data confirms the BA45F0082-16NSOP (SOP-16, 150-mil) package is the standard ordering option.
A key design consideration is lifecycle: Holtek has issued formal End Of Life (EOL) notification for the BA45F0082/BA45FH0082, with a latest purchase date of December 25, 2025. New designs should target Holtek's replacement device referenced in the EOL notice, while existing designs should secure last-time-buy inventory or qualify the replacement.
This page synthesizes EOL phase-out schedule information, cross-reference guidance, distributor pricing, and family variant data not consolidated in the manufacturer datasheet alone.
Drop-in alternatives for BA45F0082 — 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 BA45F0082 (same form factor and footprint) — differing in Core Architecture, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BA45FH0082
✅ Drop-In✓ In Stock
$0.39 / Unit
View Datasheet →BA45V0082
✅ Drop-In📋 Reference alternative (not in catalog)
BA45F0082 Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit high performance RISC |
| Program Memory Type | Flash (multi-programming) |
| Application Focus | Networking fire product peripherals |
| Package | SOP-16 (150-mil NSOP) |
| Mounting Type | Surface Mount |
| OCDS Debug Support | Yes (via BA45V0082 EV chip) |
| RoHS Status | Compliant (per LCSC listing) |
| Datasheet Revision | V1.10 (November 19, 2019) |
BA45F0082 sop-16 (150-mil nsop) Pin Configuration Guide
Pin configuration for BA45F0082 (sop-16 (150-mil nsop) 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 BA45F0082.
Refer to the datasheet for full pin configuration.
Typical Applications
BA45F0082 is suitable for 6 applications: Networking Fire Alarm Peripheral Modules, Smoke Detector Sensor Nodes, Fire Protection Control Interfaces, Fire Safety Equipment Firmware Development, Battery-Operated IoT Safety Sensors, Legacy Product Sustaining and Last-Time-Buy.
Networking Fire Alarm Peripheral Modules
The BA45F0082 is purpose-built for networking fire product peripheral applications, where it executes sensor polling, alarm threshold comparison, and communication signaling for detector nodes attached to a fire alarm network. Its 8-bit RISC core handles deterministic control loops required for alarm response timing, while Flash multi-programming allows firmware updates during commissioning or compliance re-verification without replacing the device. Integrated analog functions reduce external component count on dense detector boards. Designers should note the EOL status: with a last purchase date of December 25, 2025, new peripheral module designs should target Holtek's designated replacement device, using this MCU only for sustaining existing certified product lines.
Recommended
Smoke Detector Sensor Nodes
Battery-powered smoke detectors benefit from the BA45F0082's combination of integrated analog sensing, low-power 8-bit RISC control, and compact SOP-16 footprint. The MCU conditions the photoelectric chamber or ionization sensor signal, applies filtering and threshold logic, and drives the sounder and network interface. Flash memory allows the same board to be programmed for different detector sensitivity profiles and regional certification requirements, simplifying SKU management. The datasheet warns that unbonded pins on lower pin-count packages must be configured to avoid floating-input current consumption, which matters directly for battery life in detector nodes intended to operate for years on a single cell.
Recommended
Fire Protection Control Interfaces
In fire protection control and indication interfaces, the BA45F0082 manages pushbutton inputs, LED annunciators, relay drive logic, and communication to a master fire alarm panel. The wide range of flexible peripheral functions cited by Holtek covers timer, I/O, and analog blocks needed for supervised circuits and line monitoring. Flash multi-programming supports field reconfiguration as building wiring or zoning changes over the installation lifecycle. Given the EOL notification with a December 25, 2025 last purchase date, control-board makers should map a migration path to Holtek's replacement device and validate register-level compatibility of their existing firmware before the phase-out schedule completes.
Recommended
Fire Safety Equipment Firmware Development
During development of fire safety equipment, the BA45V0082 OCDS evaluation chip pairs with the BA45F0082: its dedicated OCDSDA and OCDSCK pins enable on-chip debugging and emulation that the production device does not expose. Teams build hardware with the BA45F0082 footprint, then use the BA45V0082-based emulation device for breakpoints, register inspection, and code trace against the 111-page V1.10 datasheet register map. Flash multi-programming allows repeated code iterations without socketed parts. This two-chip workflow shortens time-to-certification for detector products where firmware correctness is safety-critical and full-coverage testing of alarm state machines is mandatory.
Recommended
Battery-Operated IoT Safety Sensors
Low-cost IoT safety sensor endpoints - gas, heat, and combination detector nodes - can reuse the BA45F0082's proven sensing architecture even outside pure fire applications, provided designers accept the lifecycle constraint. The 8-bit RISC core and integrated analog blocks perform periodic sensor sampling with sleep-dominated duty cycles, while the SOP-16 150-mil package suits compact, cost-driven PCBs. Flash reprogrammability supports post-deployment calibration updates via the network link. Because Holtek is phasing out the part (last buy December 25, 2025), new IoT designs should start on the replacement device from the EOL cross-reference and reserve the BA45F0082 for drop-in sustaining of shipped products.
Recommended
Legacy Product Sustaining and Last-Time-Buy
For manufacturers sustaining certified fire protection products already in the field, the BA45F0082 remains the reference device: certification files, production test programs, and firmware toolchains are validated against it. The correct engineering action is a last-time-buy sized to cover remaining production plus service attrition before the December 25, 2025 cutoff in Holtek's EOL notification, followed by qualification of the manufacturer-designated replacement listed in the same document's cross-reference table. Distributor channels such as LCSC and Sourcengine can supply remaining authorized stock with traceability. Recertification impact should be assessed early since fire safety products often require re-approval on any component change.
Recommended
Recommended Products Summary
Engineering reference data for BA45F0082 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BA45FH0082 | BA45V0082 |
|---|---|---|---|
| Package | SOP-16 (150-mil NSOP) | SOP-16 (150-mil) - same | SOP-16 (150-mil) - same |
| Brand | Holtek Semiconductor | Holtek Semiconductor | Holtek Semiconductor |
| Core | 8-bit high performance RISC | 8-bit high performance RISC | 8-bit high performance RISC |
| Program Memory | Flash (multi-programming) | Flash (multi-programming) | Flash (multi-programming) |
| OCDS Debug Pins | No | No | Yes (OCDSDA/OCDSCK dedicated) |
| Intended Use | Production (fire protection peripherals) | Production variant | OCDS EV / development only |
Key Differentiators
- Purpose-built fire protection MCU with integrated sensing (vs Generic 8-bit MCUs (e.g., non-application-specific families))
- Flash multi-programming for field updates (vs OTP/mask variants in the broader Holtek lineup)
- Dedicated OCDS debug path via BA45V0082 (vs BA45FH0082)
Design Notes
Lifecycle risk dominates this design. Holtek's official EOL notification sets a latest purchase date of December 25, 2025 for the BA45F0082/BA45FH0082, and the same document provides the cross reference to the designated replacement device. Do not start new designs on this MCU; size last-time-buy inventory for legacy lines and schedule replacement-device qualification with fire-safety recertification lead time in mind, which can add months to any component change.
The datasheet explicitly warns that for lower pin-count package types there will be unbonded pins whose status should be properly configured to avoid current consumption from floating inputs. In battery-powered detector nodes this can be a significant portion of the sleep budget. Configure all unused I/O and unbonded-pin status registers to outputs-low or inputs-with-pull according to the Holtek datasheet recommendations before measuring standby current.
Use the SOP-16 150-mil (NSOP) footprint confirmed by distributor listings such as LCSC part C5444679. Keep the analog sensor input traces to the BA45F0082 short and guarded by ground to preserve the integrated ADC signal chain in smoke detector front ends. Because the same family (BA45V0082) exposes OCDS debug pins only on the EV chip, reserve footprint access for OCDSDA/OCDSK test points during development so the BA45V0082 emulation device can be substituted without PCB rework.
Compliance Information
RoHS compliance indicated by LCSC product listing for BA45F0082-16NSOP (C5444679). Other compliance attributes not stated in provided data.
