MC908QL4MDT - 8-Bit HC08 MCU 4KB Flash 16-TSSOP | NXP
料号： MC908QL4MDT ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.15 | $315.00 |
| 500 | $2.62 | $1,310.00 |
| 1,000 | $2.1 | $2,100.00 |
MC908QL4MDT 概述
A microcontroller (MCU) is a single-chip computer that combines a CPU core, volatile and non-volatile memory, and a set of programmable peripherals on one silicon die. Within the broader taxonomy, the MC908QL4MDT belongs to the HC08 family of 8-bit microcontrollers, which itself sits within the M68HC05/MC68HC08 legacy 8-bit lineup and the wider category of microcontrollers (MCU) and embedded processors. MCUs are a subset of integrated circuits (ICs) and form the computational heart of nearly every embedded system, from white goods to automotive body controllers.
Key features of the MC908QL4MDT include 4 KB (4K x 8) of in-application-reprogrammable Flash for firmware storage, an internal oscillator that eliminates an external crystal in cost-sensitive designs, a low-pin-count 16-pin TSSOP that simplifies PCB layout, and a wide operating voltage range typical of the QL family. The 8-bit CPU core provides deterministic interrupt response, making the part well suited to real-time control loops.
The architecture is built on the well-proven HC08 CISC core with a unified memory map and a MON08 background-debug-mode (BDM) interface for flash programming and in-circuit debugging. The Flash controller supports in-application programming through a TBD/IRO routine, allowing field firmware upgrades. The 13 GPIO pins multiplex with the on-chip peripherals (timer, ADC, KBI, SCI) and can be reconfigured at runtime.
Typical applications include automotive body controllers, sensor signal conditioning, simple HVAC fan/lighting controls, appliance user-interface boards, and low-cost remote keyless-entry (RKE) transmitters. The part's small footprint and internal oscillator reduce BOM cost, while the automotive temperature grade enables direct placement in cabin and under-hood modules.
When designing with this device, allocate at least one pin to the RESET signal and follow the MON08 BDM pinout for production programming. Decouple VDD/VSS pairs with 100 nF ceramic capacitors placed as close as possible to the supply pins to suppress switching transients from the internal oscillator and I/O toggling.
This page consolidates distributor stock levels, drop-in compatible alternatives, and engineering design notes not duplicated in the original NXP datasheet, providing a one-stop reference for procurement and design-in decisions.
直接替换替代料： MC908QL4MDT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
MC908QL4MDW
✅ 直接替换📋 参考替代料（不在目录中）
MC908QL4MDTE
✅ 直接替换📋 参考替代料（不在目录中）
MC908QL4MDWE
✅ 直接替换📋 参考替代料（不在目录中）
MC908QY4MDWE
✅ 直接替换📋 参考替代料（不在目录中）
PIC16F54-I/ST
✅ 直接替换📋 参考替代料（不在目录中）
MC908QL4MDT 最大额定值与电气特性
| Product Type | Microcontroller (MCU) |
| Core | HC08 (8-bit) |
| Series | MC908QL4 |
| Program Memory Size | 4 KB (4K x 8) FLASH |
| RAM Size | 128 x 8 (128 bytes) |
| Number of I/O | 13 |
| Speed (CPU Clock) | 8 MHz |
| Oscillator Type | Internal |
| 封装 / 外壳 | 16-TSSOP (0.173", 4.40 mm width) |
| 安装类型 | Surface Mount |
| Terminal Form | GULL WING |
| Number of Terminals | 16 |
| Temperature Grade | Automotive |
| 工作温度 | -40 C to +125 C |
| Packaging | Tube |
MC908QL4MDT 引脚配置
| 引脚 1 | VDD — Positive supply voltage |
| 引脚 2 | PTA0/TCLK — GPIO PTA0 / timer clock input |
| 引脚 3 | PTA1/TDO — GPIO PTA1 / timer output |
| 引脚 4 | PTA2 — GPIO PTA2 |
| 引脚 5 | PTA3/KBI3 — GPIO PTA3 / keyboard interrupt |
| 引脚 6 | PTA4/KBI4 — GPIO PTA4 / keyboard interrupt |
| 引脚 7 | PTA5/RESET — GPIO PTA5 / RESET (active low, shared with PTA5) |
| 引脚 8 | VSS — Ground reference |
| 引脚 9 | PTB0/AD0 — GPIO PTB0 / ADC channel 0 |
| 引脚 10 | PTB1/AD1 — GPIO PTB1 / ADC channel 1 |
| 引脚 11 | PTB2/AD2 — GPIO PTB2 / ADC channel 2 |
| 引脚 12 | PTB3/AD3 — GPIO PTB3 / ADC channel 3 |
| 引脚 13 | PTB4/AD4 — GPIO PTB4 / ADC channel 4 |
| 引脚 14 | PTB5/AD5 — GPIO PTB5 / ADC channel 5 |
| 引脚 15 | BKGD — MON08 background debug mode data |
| 引脚 16 | PTA6 — GPIO PTA6 |
典型应用
MC908QL4MDT 适用于 6 应用s: Automotive Body Controller, Remote Keyless Entry (RKE) Transmitter, Appliance User-Interface Board, Sensor Signal Conditioning Module, HVAC Fan and Lighting Controller, Industrial Low-Cost Counter / Timer Module.
Automotive Body Controller
The MC908QL4MDT is a strong fit for compact automotive body-control modules such as lighting drivers, mirror controllers, and seat switch interfaces. The HC08 core delivers deterministic interrupt response for debouncing mechanical switch inputs, while the 4 KB Flash comfortably holds typical switch-logic and PWM dimming firmware. The automotive -40 C to +125 C temperature grade allows direct placement in cabin and under-hood environments without additional thermal conditioning. Engineers typically pair the part with low-side FET drivers on the 13 GPIO pins and use the internal 8 MHz oscillator to minimise BOM cost on high-volume body modules.
推荐
Remote Keyless Entry (RKE) Transmitter
The MC908QL4MDT is widely used in low-cost RKE transmitters due to its tiny 16-TSSOP footprint and internal oscillator that eliminates the external crystal. The 4 KB Flash is sufficient for rolling-code algorithms and button-scanning firmware, while the 128-byte RAM holds the transmission buffer and key state. The HC08 core's low-power STOP/WAIT modes extend coin-cell battery life across multi-year standby targets. Designers pair the MCU with sub-GHz RF transmitters (315/433 MHz) and a few tactile buttons, achieving a complete 4-button keyfob on a single-sided PCB under 25 mm square.
推荐
Appliance User-Interface Board
In white-goods appliances such as washing machines, dishwashers, and microwave ovens, the MC908QL4MDT serves as the user-interface controller driving LED indicators, seven-segment displays, and buzzer feedback. The 13 GPIO pins map cleanly to a 4-digit display plus 6-8 key switches, while the internal oscillator removes the BOM cost of a timing crystal. The wide automotive temperature grade ensures reliable operation across cold-start and hot-steam kitchen environments. Firmware updates via the MON08 BDM interface during production programming keep the manufacturing flow simple.
推荐
Sensor Signal Conditioning Module
The MC908QL4MDT fits sensor signal-conditioning modules that require on-board linearisation, threshold detection, and a serial output back to a host ECU. The HC08 core's 8 MHz bus clock provides enough MIPS for first-order digital filtering of slow analog signals, while the 4 KB Flash holds calibration constants and look-up tables. The wide temperature range and small TSSOP package allow placement directly on the sensor PCB inside sealed enclosures. Engineers commonly use the keyboard-interrupt (KBI) pins to wake the MCU from STOP mode on a threshold crossing, extending battery life in wireless sensor nodes.
推荐
HVAC Fan and Lighting Controller
The MC908QL4MDT is a good fit for low-end HVAC fan-speed controllers and architectural lighting dimmers where a 16-TSSOP footprint and 4 KB Flash are sufficient. The HC08 core's PWM channels (multiplexed onto GPIOs) drive TRIAC gate pulses or MOSFET gates for fan/dimmer power stages, while the 13 I/O pins handle keypad, rotary-encoder, and status-LED inputs. The internal oscillator removes a BOM line, and the automotive temperature grade covers outdoor-rated lighting enclosures. Designers typically add zero-cross detection on one GPIO to synchronise TRIAC firing.
推荐
Industrial Low-Cost Counter / Timer Module
The MC908QL4MDT supports simple industrial pulse-counter and timer modules such as event loggers, machine-cycle timers, and conveyor counters. The HC08 core's timer/counter peripherals multiplex onto GPIOs for quadrature decoding or frequency measurement, while 128 bytes of RAM holds rolling event counts and 4 KB Flash stores configuration tables. The wide temperature grade supports factory-floor environments, and the small TSSOP package fits inside DIN-rail enclosure housings. Designers typically add an external RS-485 transceiver driven by the SCI peripheral for Modbus-RTU field reporting.
推荐
推荐产品汇总
工程参考数据： MC908QL4MDT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MC908QL4MDW | MC908QL4MDTE | MC908QL4MDWE | MC908QY4MDWE | PIC16F54-I/ST |
|---|---|---|---|---|---|---|
| Package | 16-TSSOP | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Microchip Technology |
| Core Architecture | HC08 (8-bit) | HC08 (8-bit) - same | HC08 (8-bit) - same | HC08 (8-bit) - same | HC08 (8-bit) - same | PIC16 (8-bit) - cross-arch |
| Program Memory | 4 KB Flash | 4 KB Flash | 4 KB Flash | 4 KB Flash | 4 KB Flash | 4 KB Flash |
| RAM Size | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 32 bytes |
| Maximum CPU Clock | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 20 MHz |
| GPIO Count | 13 | 13 | 13 | 13 | 14 (+1 vs QL) | 12 |
| Oscillator Type | Internal | Internal | Internal | Internal | Internal | Internal + external option |
| Temperature Grade | Automotive (-40 C to +125 C) | Automotive (-40 C to +125 C) | Industrial | Automotive (-40 C to +125 C) | Automotive (-40 C to +125 C) | Industrial (-40 C to +85 C) |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | Active |
关键差异点
- Same-die NXP siblings cover wide-temperature, tape-and-reel, and QY-family I/O expansions （对比 MC908QL4MDW / MC908QL4MDTE / MC908QL4MDWE)
- QY family offers +1 GPIO with identical footprint （对比 MC908QY4MDWE)
- Cross-brand PIC16F54-I/ST exists in 16-TSSOP but is NOT pin-compatible （对比 PIC16F54-I/ST (Microchip))
设计说明
Decouple every VDD/VSS pin pair with a 100 nF X7R ceramic capacitor placed within 3 mm of the supply pin. The HC08 internal oscillator draws short switching transients on VDD; adding a bulk 10 uF tantalum or ceramic cap near the package further reduces supply ripple that could otherwise couple into ADC conversions on PTB[0:5].
Route the RESET line with a 10 kohm pull-up to VDD and keep traces short (<25 mm). The BKGD pin (MON08 background-debug-mode data) must be accessible via a test pad or header for production programming - do not place it under the package or behind other components, or field firmware updates become impossible without desoldering.
Do not assume all 13 GPIOs are 5 V tolerant; the HC08 QL family's I/O structure is referenced to VDD and will be damaged if driven above VDD. Use a level translator when interfacing 5 V inputs to a 3 V VDD design. Also note that PTA5 is multiplexed with RESET - external reset circuitry must release the pin to GPIO mode before driving it as an output.
Estimated: at 8 MHz bus clock and full GPIO switching (13 I/O at 20 pF load, 50% toggle rate), the MC908QL4MDT draws approximately 6-8 mA from VDD, dissipating roughly 25 mW at 3.3 V. The 16-TSSOP theta_JA of approximately 110 C/W yields a junction rise of ~3 C above ambient - well within the -40 C to +125 C automotive envelope with no heatsink required.
合规信息
RoHS, REACH, AEC-Q100, lead-free, and halogen-free flags were not explicitly stated in the verified web data and are listed as 'unknown' per Data Authenticity Rule 2. The automotive temperature grade (-40 C to +125 C) is confirmed via the NXP MC908QL4 family datasheet. For AEC-Q100-qualified designs, consult the NXP ordering table for the QG / QT suffix variants.
