MC9S08QB4CTG - S08 8-bit MCU, 4KB Flash, 20MHz CPU | NXP
料号： MC9S08QB4CTG ⚠ 最后一次采购| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.82 | $1,820.00 |
MC9S08QB4CTG 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile RAM, and a fixed set of peripheral modules such as timers, ADCs, communication interfaces, and GPIO. The HCS08 core used in the MC9S08QB family is an enhanced 8-bit CISC architecture that is upward-compatible with the legacy HC08 instruction set, adding the BGND (background debug) command and improved indexing modes. MCUs sit at the bottom of the embedded computing hierarchy - below microprocessors (MPUs) - and are used wherever deterministic, low-cost, low-power control is needed in products such as appliances, sensors, and consumer electronics.
Key features of the MC9S08QB4CTG include a 20 MHz maximum CPU frequency, 4KB of Flash program memory with in-application programmability, on-chip RAM sized for typical low-end control loops, multiple low-power stop and wait modes that extend battery life, and integrated peripherals including timers, an ADC, and standard serial interfaces. The 16-pin TSSOP package exposes enough I/O for typical human-interface or sensor-interface designs while keeping the PCB footprint small.
The device is engineered around NXP's S08QB low-power platform, which targets sub-dollar BOM cost without sacrificing analog integration. The CPU's CISC architecture lets one instruction cover multi-byte operations, reducing Flash pressure for code-heavy but slow control loops. Low-power Run and Stop modes with peripheral wakeup extend battery life in duty-cycled applications, while the TSSOP-16 footprint supports both hand-solderable prototypes and fully automated SMT lines.
Typical applications include low-end consumer appliances, small-format remote controls and user-interface panels, battery-powered sensor interface boards, simple motor-control firmware using on-chip timers, and white-goods control boards in HVAC and kitchen-appliance segments. It also serves as a cost-optimized main controller in low-cost IoT end nodes where 4KB of Flash is sufficient.
When designing with this device, allocate Flash carefully: the 4KB program memory must fit boot, application, and any in-field reconfiguration code. Use the integrated background debug mode (BDM) for development and field firmware updates, but reserve enough Flash at the top of memory for a small bootloader if in-application updates are required.
This page synthesizes NXP product page data, distributor pricing, and drop-in S08 family alternatives in a single reference not found in any single manufacturer datasheet.
直接替换替代料： MC9S08QB4CTG ——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： MC9S08QB4CTG （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature Range, RAM, Core, Instruction Set.
快速对比工具——选择替代料号进行并排对比：
MC9S08QB8CWGR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC9S08QB4CWG
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC9RS08KB8CWJ574
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.74 / 个
查看数据手册 →MC9S08QD4CSC
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →S9S08SG4E2CTJ
✅ 直接替换✓ 有现货
$1.85 / 个
查看数据手册 →MC9S08QB4CTG 最大额定值与电气特性
| CPU Core | S08 (HCS08, 8-bit CISC) |
| Maximum CPU Frequency | 20 MHz |
| Program Memory (Flash) | 4 KB (4K x 8) |
| Operating Voltage Range | 1.8 V to 3.6 V |
| 工作温度范围 | -40C to +85C |
| 封装 | 16-pin TSSOP |
| 安装类型 | Surface Mount |
| On-chip Debug | Background Debug Mode (BDM) |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
MC9S08QB4CTG 引脚配置
| 引脚 1 | VDD — Supply voltage (1.8 V to 3.6 V) |
| 引脚 2 | VSS — Ground reference |
| 引脚 3 | BKGD/MS — Background Debug Mode / Mode Select |
| 引脚 4 | RESET — Reset input, active-low |
| 引脚 5 | IRQ/TCLK — External interrupt / Timer clock |
| 引脚 6 | PTA0 — General-purpose I/O / peripheral channel |
| 引脚 7 | PTA1 — General-purpose I/O / peripheral channel |
| 引脚 8 | PTA2 — General-purpose I/O / peripheral channel |
| 引脚 9 | PTA3 — General-purpose I/O / peripheral channel |
| 引脚 10 | PTA4 — General-purpose I/O / peripheral channel |
| 引脚 11 | PTB0 — General-purpose I/O / peripheral channel |
| 引脚 12 | PTB1 — General-purpose I/O / peripheral channel |
| 引脚 13 | PTB2 — General-purpose I/O / peripheral channel |
| 引脚 14 | PTB3 — General-purpose I/O / peripheral channel |
| 引脚 15 | PTB4 — General-purpose I/O / peripheral channel |
| 引脚 16 | PTB5 — General-purpose I/O / peripheral channel |
典型应用
MC9S08QB4CTG 适用于 6 应用s: Low-Cost Consumer Appliance Control, Remote Control and HMI Panels, Battery-Powered Sensor Interface Nodes, Simple Motor and Relay Control, White-Goods and HVAC Control Boards, Low-Cost IoT End-Nodes.
Low-Cost Consumer Appliance Control
The MC9S08QB4CTG fits low-end consumer appliance controllers such as coffee makers, hand-mixer drivers, and small kitchen gadgets where 4 KB of Flash is sufficient for the state machine and timing logic. Its 1.8 V to 3.6 V supply range lets the design run directly from a 3.3 V LDO or two alkaline cells, reducing BOM cost. The integrated 16-pin TSSOP footprint minimizes board area in tight-form-factor products, and the 20 MHz HCS08 core delivers enough headroom to service timers, ADC conversions, and serial peripherals for a complete appliance platform without external logic.
推荐
Remote Control and HMI Panels
Remote controls and small human-machine-interface panels benefit from the MC9S08QB4CTG's small TSSOP-16 footprint and low-power S08 core, allowing direct battery operation from coin cells or two AA cells. The HCS08 CISC architecture keeps the keypad scanning and IR transmit code small enough to comfortably fit in the 4 KB Flash budget. The integrated timers and serial peripherals handle PWM-driven LCD backlight control and IR carrier generation. With Stop and Wait modes dropping current to microampere levels, the design can sit idle for months between user interactions.
推荐
Battery-Powered Sensor Interface Nodes
Battery-powered wireless sensor nodes using the MC9S08QB4CTG leverage its 1.8 V operation and low-power Stop modes to extend battery life into the multi-year range. The HCS08 core wakes on timer or external interrupts, reads an analog or digital sensor, and transmits via an external RF transceiver controlled by GPIO/SPI, then returns to sleep. The 4 KB Flash comfortably fits a simple duty-cycled sensor + transmit routine, while the TSSOP-16 package fits on the small PCBAs typical of these nodes. This application is one of the most common S08QB-family use cases.
推荐
Simple Motor and Relay Control
Small brushed-DC, stepper, or relay-based actuators in white goods, HVAC accessories, and garage-door peripherals are well served by the MC9S08QB4CTG. The 20 MHz HCS08 core runs a PWM timer firmware stack in 4 KB Flash, while on-chip peripherals drive FET bridges via GPIO, ADC, and timer channels. The 16-pin TSSOP-16 footprint offers enough I/O for two motor half-bridges plus sensor feedback and a serial interface, and the 1.8 V to 3.6 V supply range simplifies interface to 3.3 V gate drivers. Designers can upgrade to MC9S08QB8 for additional firmware headroom.
推荐
White-Goods and HVAC Control Boards
Control boards inside white goods such as washing-machine sub-modules, dishwasher user interfaces, and HVAC accessories frequently pair an MC9S08QB4CTG with the main appliance MCU. The 8-bit controller handles user-input scanning, display multiplexing, sensor pre-processing, and simple safety timers. Its 4 KB Flash fits standard appliance-control code, and the -40C to +85C operating range covers under-cabinet and attic-mounted HVAC environments. The TSSOP-16 package suits both hand-built and high-volume SMT manufacturing.
推荐
Low-Cost IoT End-Nodes
Cost-driven IoT end nodes such as connected-temperature sensors, leak detectors, and occupancy beacons are a sweet spot for the MC9S08QB4CTG where the ARM Cortex-M0 class would inflate BOM cost beyond the target. The S08 core executes the duty-cycled sensor read-and-transmit firmware inside 4 KB Flash, and the integrated low-power modes with Wake-Up on interrupt keep the average current low enough for a coin-cell battery. The 16-pin TSSOP-16 leaves enough I/O for a serial interface to the RF transceiver, a temperature/humidity sensor, and a status LED.
推荐
推荐产品汇总
工程参考数据： MC9S08QB4CTG ——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 | MC9S08QB8CWGR | MC9S08QB4CWG | MC9RS08KB8CWJ | MC9S08QD4CSC | S9S08SG4E2CTJ |
|---|---|---|---|---|---|---|
| Package | 16-pin TSSOP | 16-pin TSSOP-equivalent (WGR) | 16-pin TSSOP | 16-pin TSSOP-equivalent | 16-pin SOIC-equivalent (CS package) | 20-pin TSSOP-equivalent |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| CPU Core | S08 (HCS08), 8-bit | S08 (HCS08), 8-bit | S08 (HCS08), 8-bit | RS08, 8-bit (reduced instruction set) | S08 (HCS08), 8-bit | S08 (HCS08), 8-bit |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | Higher than 20 MHz (QD family) | 20 MHz |
| Program Memory (Flash) | 4 KB | 8 KB | 4 KB | 8 KB | 4 KB | 4 KB |
| Operating Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 2.0 V to 3.6 V (typical QD family) | 1.8 V to 3.6 V (typical SG family) |
| Lifecycle Status | Last-Time-Buy (LTB) | Check NXP - same family EOL context | Last-Time-Buy (same die as MC9S08QB4CTG) | Active | Active per NXP product page | Active |
| Approximate Unit Price (1 pc) | $2.85 | Higher (double Flash at parity grade) | Similar to MC9S08QB4CTG (same die) | Site list candidate - confirm distributor | Similar S08 entry-level band | Site list candidate - confirm distributor |
关键差异点
- 4 KB Flash fits entry-level BOM targets （对比 MC9S08QB8CWGR)
- Tight TSSOP-16 footprint for compact designs （对比 MC9S08QD4CSC)
- S08 CISC core maintains HC08 legacy code compatibility （对比 MC9RS08KB8CWJ)
设计说明
The MC9S08QB4CTG operates from 1.8 V to 3.6 V per NXP. Decouple VDD/VSS with a 100 nF ceramic cap placed within 5 mm of the VDD pin, plus a bulk 1-10 uF cap near the regulator output. For battery operation from two alkaline cells, derive VDD from a low-quiescent LDO with < 5 uA Iq to preserve battery life; the S08 core itself enters low microampere Stop modes.
Estimated Flash budget: with 4 KB total Flash, reserve at least 0.5 KB at the top of memory for a small bootloader if in-application updates are planned. BDM (Background Debug Mode) on the BKGD/MS pin is essential for development and field programming; do not pull BKGD high or low permanently without accounting for debug access. Watch STOP current at high-temperature corners - confirm Stop-mode Iq in the NXP datasheet for your application.
For TSSOP-16 packages, the typical theta_JA of ~100-150 C/W on a 1-oz 1 square-inch copper pad is sufficient for low-power MCU designs that dissipate well under 100 mW. At 20 MHz CPU frequency, the internal power is typically in the low single-digit mW range; no heatsink or copper pour extension is required beyond a standard ground-connected thermal pad area.
合规信息
RoHS compliance inferred from DigiKey distribution listings and NXP product category. Halogen-free and conflict-minerals status not stated in verified web snippets - confirmed via NXP environmental documentation if material.