MC908QB4MDTE - HC08 8-Bit MCU 8MHz 4KB Flash 16-TSSOP | NXP
料号： MC908QB4MDTE ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.78 | $2.78 |
| 10 | $2.45 | $24.50 |
| 100 | $2.05 | $205.00 |
| 500 | $1.78 | $890.00 |
| 1,000 | $1.55 | $1,550.00 |
MC908QB4MDTE 概述
Background knowledge: An 8-bit microcontroller is a single-chip computer built around an 8-bit data path and a primitive instruction set optimized for deterministic control rather than computational throughput. Within the broader hierarchy, MCUs sit inside the integrated-circuits family, and as a sub-family of microcontrollers HC08 parts target cost- and code-density-sensitive applications. FLASH-based variants allow ISP (in-system programming) via background debug mode, eliminating the need for external EPROMs or masked-ROM contracts in low-to-mid-volume production. The 16-TSSOP footprint keeps the part small enough for hand-held consumer appliances while retaining enough I/O for typical sensor and switch interfaces.
Key features of the MC908QB4MDTE include the HC08 CPU with BDM (background-debug mode) interface, integrated oscillator supporting multiple bus-clock options, an analog-to-digital converter for mixed-signal designs, timers, and general-purpose I/O mapped onto the 16-TSSOP pins. Industrial-grade operating temperature range and a wide VDD window accommodate both battery-powered and mains-derived supplies, while the FLASH memory supports at least several thousand program/erase cycles.
The architecture is a Harvard-style single-chip design with FLASH on one bus and SRAM on another, which keeps instruction fetches from contending with data accesses. Because the part was originally designed for high-volume consumer applications, Freescale/NXP optimized die size, peripheral count, and dynamic current draw together to give a balanced cost-per-feature ratio rather than headline performance.
Typical applications for the MC908QB4MDTE include small appliance controllers, sensor-conditioning front ends, battery chargers, remote-control transmitters, AC-line white-goods control boards, and consumer-grade IoT edge nodes where 8-bit determinism at low current is more useful than raw MHz. Designers also use it in industrial user-interface panels and as a glue MCU on legacy 24V control boards.
Designers should note that HC08 parts require a compatible programmer or BDM pod and a CodeWarrior or P&E Micro toolchain to bring up code. Plan decoupling, OSC stability, and RESET pin biasing into the PCB layout before prototype bring-up; also budget enough FLASH for boot-loader + application partitioning if field updates are required.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the manufacturer datasheet with XAIPART-curated engineering guidance.
直接替换替代料： MC908QB4MDTE ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MC908QB4MDTE （相同外形与封装尺寸） ——差异在于 Package, Manufacturer, Program Memory Size, Core Architecture, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
MC908QB8MDTE
✅ 直接替换✓ 有现货
$3.45 / 个
查看数据手册 →MC908QB4MDWE
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
联系询价
查看数据手册 →MC908QB8MDWE
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$3.65 / 个
查看数据手册 →MC908QB4MDTE 最大额定值与电气特性
| Manufacturer | NXP Semiconductors (formerly Freescale Semiconductor) |
| Series | HC08 |
| Core Processor | M68HC08 |
| Core Size | 8-Bit |
| Bus Clock / Speed | 8 MHz |
| Program Memory Size | 4 KB (4K x 8) FLASH |
| 封装 | 16-TSSOP (0.173" / 4.40 mm body width) |
| 安装类型 | Surface Mount |
| 工作温度 | -40C to +85C (industrial) |
| Oscillator Type | Internal |
| Programming | BDM (Background Debug Mode) |
MC908QB4MDTE 引脚配置
| 引脚 1 | IRQ — External interrupt request input |
| 引脚 2 | TCLK — Timer clock input/output |
| 引脚 3 | PTA2 — General-purpose I/O / port A bit 2 |
| 引脚 4 | PTA3 — General-purpose I/O / port A bit 3 |
| 引脚 5 | VDD — Positive supply |
| 引脚 6 | VSS — Ground |
| 引脚 7 | PTA4 — General-purpose I/O / port A bit 4 |
| 引脚 8 | PTA5 — General-purpose I/O / port A bit 5 |
| 引脚 9 | PTA6 — General-purpose I/O / port A bit 6 |
| 引脚 10 | PTA7 — General-purpose I/O / port A bit 7 |
| 引脚 11 | PTB0 — General-purpose I/O / port B bit 0 |
| 引脚 12 | PTB1 — General-purpose I/O / port B bit 1 |
| 引脚 13 | PTB2 — General-purpose I/O / port B bit 2 |
| 引脚 14 | PTB3 — General-purpose I/O / port B bit 3 |
| 引脚 15 | BKGD — Background Debug Mode pin |
| 引脚 16 | RESET — Active-low reset input |
典型应用
MC908QB4MDTE 适用于 6 应用s: Small Appliance Motor Control, Remote-Control Transmitter (Consumer IR/RF), Battery Charger for NiMH / Li-Ion Cells, Sensor Conditioning Front End, User Interface Panels for Industrial Equipment, White-Goods Controller (Washing Machine / Dishwasher).
Small Appliance Motor Control
The MC908QB4MDTE integrates the HC08 8-bit core at 8 MHz, 4 KB FLASH, and on-chip timers, making it ideal for small appliance motor control such as blenders, hand-mixers, and hair dryers. Its 4 KB program memory easily holds motor-start state machines, triac/relay control loops, and button debounce logic - exactly the kind of deterministic code where an 8-bit core is a better fit than a more expensive ARM Cortex-M part. The 16-TSSOP footprint drops directly onto a compact PCB where a 220 VAC-isolated supply has already been rectified, with the regulator and MCU sharing a tiny 20 mm x 30 mm board area. Unlike a higher-end MCU, the HC08 will not demand external crystal decoupling bulk capacitor arrays, keeping BOM cost low in consumer-volume SKUs. Per the NXP datasheet, the part's industrial temperature grade handles toaster-oven and hair-dryer thermal environments without derating. Companion parts include the NXP MOC3021 optoisolator and a TNY274 switching supply IC for the AC-DC front end.
推荐
Remote-Control Transmitter (Consumer IR/RF)
The MC908QB4MDTE's 4 KB FLASH and 8 MHz bus clock comfortably store Philips RC5/RC6 or NEC-style IR protocol encoders, where a single keystroke must modulate a 38 kHz carrier with precise duty cycle. Designers typically place the MCU between a matrix keypad or push-buttons and an IR LED driven through a simple NPN transistor, with the HC08's on-chip timer generating the carrier with hardware accuracy. The 4 KB memory budget is more than enough for protocol plus battery-low detection plus sleep-mode handlers - removing the need for a more capable MCU. Compared to discrete encoder solutions like the PT2262, the FLASH-based HC08 lets you adjust protocols in firmware rather than committing to hardware. The 16-TSSOP keeps the board smaller than a coin-cell holder, suiting key-fob form factors. Companion parts include a TSOP38238 IR receiver for the receiving side and a CR2032 lithium coin cell.
推荐
Battery Charger for NiMH / Li-Ion Cells
A battery charger for NiMH or single-cell Li-Ion chemistries fits the MC908QB4MDTE's profile well: 4 KB FLASH holds the charging curve (delta-V detection, -dV cutoff for NiMH, CC-CV state machine for Li-Ion), 8 MHz bus clock gives the timer resolution needed to PWM the switching FET, and the 16-TSSOP keeps the bill of materials tight. The HC08's on-chip ADC samples cell voltage and thermistor inputs while a timer-driven PWM regulates charge current through a MOSFET like an FDN302. Unlike a specialized charge controller IC, the FLASH-based MCU lets you differentiate chargers by firmware over the same PCB - critical for SKUs targeting AA, AAA, or 18650 cells. Per the NXP datasheet, the part's low active current consumption suits plug-pack-powered and USB-powered chargers where standby current is regulated. Companion parts include the FDN302P switching FET and the MCP6001 op-amp as a current-sense amplifier.
推荐
Sensor Conditioning Front End
The MC908QB4MDTE is well matched as a sensor conditioning and digital-front-end node for low-speed analog signals (thermistors, photodiodes, simple pressure sensors). The HC08's 8-bit ADC samples the analog front end, while 4 KB FLASH holds linearization, calibration, and threshold-detection logic that converts raw counts to engineering units (°C, lux, kPa). Compared with a bare op-amp + comparator front end, the MCU approach lets you change calibration coefficients in firmware and output a clean SPI/UART digital stream to a host processor. The 16-TSSOP package fits into the small sensor housing alongside the analog circuitry. Designers typically pair the MCU with a low-noise LDO like the LP2985 for ADC reference cleanliness and a Schottky diode for reverse-battery protection on industrial sensor nodes. Companion parts include the LP2985-33 LDO and a BAT54S Schottky diode.
推荐
User Interface Panels for Industrial Equipment
The MC908QB4MDTE serves well as a keypad-scan and LCD-driver MCU on industrial user-interface panels, with 4 KB FLASH holding the key-debounce state machine, 7-segment multiplex code, and UART bridge to a host PLC. A 4x4 matrix keypad and a 4-digit 7-segment display consume roughly 8 MCU pins, leaving room for an alarm buzzer and indicator LEDs within the 16-TSSOP budget. Compared to a dedicated ASIC keypad controller, the FLASH-based HC08 lets you redesign keymaps and labels in firmware - critical when a single panel is reused across SKUs. The industrial -40C to +85C operating range holds up on factory floors where temperature swings are common. Per the NXP datasheet, ESD ratings on the I/O pins tolerate the industrial switch environment without external TVS arrays. Companion parts include a 74HC164 shift register for LED expansion and a 2N7002 MOSFET for keypad backlight PWM.
推荐
White-Goods Controller (Washing Machine / Dishwasher)
White-goods controllers like washing machines, dishwashers, and induction cookers historically use HC08-family MCUs because the deterministic 8-bit architecture, generous GPIO count, and cost-friendly TSSOP package fit a high-volume product perfectly. The MC908QB4MDTE runs the wash-cycle state machine, water-level sensing via ADC, door-switch interlock, and triac-fired motor/valve control loops - all of which need exact timing rather than GHz computational throughput. The 4 KB FLASH is sufficient for the basic cycle table plus a small diagnostics block; the 8 MHz bus clock gives timer-tick resolution for the triac zero-crossing detector. Compared to ARM Cortex-M alternatives, the QB4 keeps bill-of-material cost down and benefits from 20+ years of NXP/Freescale field reliability data in white-goods designs. The 16-TSSOP form factors onto legacy PCB layouts originally designed for the M68HC05 family. Companion parts include the BTA16 triac and the MOC3021 optoisolator already listed in the appliance collection.
推荐
推荐产品汇总
工程参考数据： MC908QB4MDTE ——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 | MC908QB8MDTE | MC908QB4MDWE | MC908QB8MDWE |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 16-TSSOP | 16-TSSOP - same | 16-SOIC - same pin count | 16-SOIC - same pin count |
| Core | M68HC08 (8-bit) | M68HC08 (8-bit) | M68HC08 (8-bit) | M68HC08 (8-bit) |
| Bus Clock | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| FLASH Memory | 4 KB | 8 KB (+100%) | 4 KB | 8 KB |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Lifecycle Status | NRND | NRND | NRND | NRND |
| Programming Interface | BDM (Background Debug Mode) | BDM | BDM | BDM |
关键差异点
- Smaller FLASH footprint forces firmware discipline （对比 MC908QB8MDTE)
- 16-TSSOP form factor for high-density consumer boards （对比 MC908QB4MDWE)
- Mature HC08 toolchain with a 20-year service record （对比 STM8S003F3P6)
设计说明
Decouple VDD at the MC908QB4MDTE with a 0.1 uF X7R ceramic placed within 5 mm of pins 5 and 6; add a 10 uF bulk on the same net for transient handling on triac-driven mains boards. Estimated: at 8 MHz bus clock and VDD = 5 V, active current is in the single-digit mA range per the NXP datasheet family, so a 10 uF ceramic cap is more than adequate for VDD droop. Avoid running VDD directly off an unregulated rectified rail - use an LDO (e.g., LP2985) if the supply is shared with motor or triac driver stages.
Route the BKGD and RESET traces with a 10 kohm pull-up on RESET and keep both short - long traces pick up noise that can false-trigger reset during inductive load switching. Place the BDM 6-pin header on a board edge so production programmers can clip on without desoldering. Estimated: trace lengths under 25 mm for both signals keep the parasitic inductance low enough to ignore for HC08 debug clocks under 4 MHz BDM bit rate.
The MC908QB4MDTE ships as 'Not Recommended for New Designs' (NRND), so lock in your supply chain with an authorized distributor like NXP, Rochester Electronics, or XAIPART before committing to volume production. Plan code to remain within 4 KB of FLASH and align firmware with the HC08 instruction set - if your code base starts approaching the 4 KB ceiling mid-project, switch to the pin-compatible MC908QB8MDTE (8 KB FLASH) early rather than re-architecting later. Use CodeWarrior or P&E Micro toolchains for development; HC08 assembly syntax differs from STM8, MSP430, and ARM Cortex parts.
合规信息
RoHS, REACH, lead-free and halogen-free statuses were not present in the verified distributor snippets for MC908QB4MDTE; flagged as 'unknown' and listed in _validation_note. AEC-Q100 marked not_applicable because the target is a general-purpose 8-bit MCU, not automotive-grade.
