MC9S08GT32CB - 8-Bit 40MHz 32KB Flash MCU | NXP
MPN: MC9S08GT32CB ✗ End of Life| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MC9S08GT32CB Overview
A microcontroller is a semiconductor device that integrates a processor core, program memory, data memory, I/O, and peripherals into one embedded-control component. The S08 family is an 8-bit MCU platform designed for control-oriented products, where deterministic peripherals, modest memory requirements, and simple firmware execution are more important than processor performance for desktop-class workloads. MC9S08GT32CB belongs to the S08 microcontroller hierarchy and provides a compact platform for embedded logic, sensing, communications, and actuator control.
Key verified features include a 40 MHz clock, 32 KB Flash program memory, 2 KB of RAM, 34 I/O pins, and support for up to 32 interrupt or reset sources. The device also includes I2C, SCI, and SPI connectivity, along with PWM, watchdog-timer, low-voltage-detection, and power-on-reset peripherals. Software-selectable pullups are available on ports used as inputs, while the RESET and IRQ pins include internal pullups.
The S08 CPU uses the HC08 instruction set with the BGND instruction, supporting the MCU's embedded-control architecture. Flash memory permits firmware updates and programmed production quantities without EEPROM, while the available RAM supports working variables, stack operations, communication buffers, and control-loop state. The 42-pin PDIP package provides through-hole assembly compatibility for industrial and legacy PCB designs.
Typical uses include motor and actuator controllers, industrial interface modules, instrumentation, communication hubs, sensor nodes, and legacy industrial control systems. When designing around this device, verify the exact pinout, voltage limits, peripheral multiplexing, and timing requirements from the manufacturer datasheet. The CB suffix and package configuration should be confirmed during procurement rather than inferred from other S08 variants.
Drop-in alternatives for MC9S08GT32CB — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesMC9S08GT32CB Maximum Ratings & Electrical Characteristics
| Core | S08 8-bit |
| Maximum Clock Frequency | 40 MHz |
| Program Memory | 32 KB Flash |
| RAM | 2 KB |
| Number of I/O | 34 |
| Package | 42-pin PDIP |
| Instruction Set | HC08 with BGND instruction |
| Interrupt and Reset Sources | Up to 32 sources |
| Serial Interfaces | I2C, SCI, SPI |
| Timer and Control Peripherals | PWM, watchdog timer |
| Voltage Protection Features | Low-voltage detection and power-on reset |
| Port Input Pullups | Software selectable on ports |
| RESET and IRQ Pullups | Internal pullups |
| EEPROM | Not specified in verified data |
| Lifecycle Status | Obsolete |
MC9S08GT32CB 42-pin pdip Pin Configuration Guide
Pin configuration for MC9S08GT32CB (42-pin pdip 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 MC9S08GT32CB.
Refer to the datasheet for full pin configuration.
Typical Applications
MC9S08GT32CB is suitable for 8 applications: Legacy industrial control systems, Motor and actuator controllers, Sensor and instrumentation nodes, Communication interface modules, Timing and PWM control panels, Legacy consumer and appliance controllers, Embedded educational and development platforms, Communication-assisted service equipment.
Legacy industrial control systems
The MC9S08GT32CB fits legacy industrial control systems that already use an S08 board and require an 8-bit processor with 34 I/O pins. Its 40 MHz S08 core provides more than enough computational capability for sequencing, state machines, interlocks, and actuator-control logic, while 32 KB of Flash stores application firmware and 2 KB of RAM supports working variables and control buffers. The 42-pin PDIP format is especially useful when maintaining through-hole equipment. I2C, SCI, SPI, PWM, watchdog-timer, low-voltage-detection, and power-on-reset features help consolidate functions around one controller. Because the device is obsolete, use it mainly where redesigning an existing industrial PCB would create greater risk than constrained sourcing.
Recommended
Motor and actuator controllers
For motor, solenoid, and actuator control, the MC9S08GT32CB can combine a fast control loop with the S08 instruction set and its PWM capability. The 34 I/O pins provide ample digital connections for inputs, outputs, direction signals, and interlocks, while the 2 KB RAM is suitable for maintaining timing state and simple control variables. The watchdog timer can help recover from unexpected program flow, and the low-voltage-detection and power-on-reset features support dependable startup behavior. Use SCI, SPI, or I2C to connect to a supervisory controller or external sensor. Validate pulse-width limits, pin multiplexing, current ratings, thermal conditions, and motor-driver isolation from the exact datasheet.
Recommended
Sensor and instrumentation nodes
The MC9S08GT32CB is suitable for compact instrumentation and sensor-node designs that need multiple digital inputs and serial sensor connectivity. The I2C interface can connect addressable sensors, the SCI interface can provide a simple host or service link, and SPI can support higher-speed external peripherals. The 8-bit core and 32 KB Flash are appropriate for calibration tables, filtering, diagnostics, and protocol handling rather than high-bandwidth signal processing. Software-selectable port pullups can reduce external conditioning where appropriate. A careful design should define sensor levels, isolation, grounding, and power requirements before connecting field wiring. The obsolete lifecycle status makes supply assurance and long-term firmware maintenance important design constraints.
Recommended
Communication interface modules
MC9S08GT32CB can serve as the controller in a small communication interface or protocol-conversion module because it includes I2C, SCI, and SPI in one MCU. Firmware can translate between host commands and peripheral transactions, maintain framing or timing state, and report diagnostics through SCI. Thirty-four I/O pins leave useful capacity for connectors, status indicators, mode controls, and interface isolation. The 40 MHz clock supports protocol handling and background tasks, while the watchdog timer can improve recovery behavior after unexpected faults. Before deployment, verify voltage levels, connector protection, baud-rate or clock assumptions, and the exact peripheral pin assignments in the manufacturer documentation.
Recommended
Timing and PWM control panels
The MC9S08GT32CB is appropriate for control panels that require deterministic digital timing and PWM outputs alongside modest data processing. Its PWM peripheral can support repetitive actuator, indicator, or timing waveforms, while the 34 I/O pins provide connections for switches, status LEDs, interlocks, and external logic. The S08 core can perform sequencing and fault handling, and the 32 KB Flash provides room for menu logic, calibration data, or configuration constants. Designers should compare PWM frequency, resolution, duty-cycle limits, and pin multiplexing against the exact device documentation. The 42-pin PDIP package is useful for repairable industrial panels, although its through-hole form factor is less compact than modern surface-mount packages.
Recommended
Legacy consumer and appliance controllers
For appliance and equipment controllers that depend on a long-lived 8-bit control platform, MC9S08GT32CB can manage buttons, indicators, relays, and simple motor functions from one integrated device. Its I2C, SCI, and SPI interfaces allow connection to displays, sensors, modules, or service ports, while the watchdog timer and power-on-reset support robust startup behavior. Thirty-four I/O pins reduce the need for additional logic when the product needs many discrete control points. Because the part is obsolete, appliance makers should validate mechanical compatibility, electrical limits, software timing, and long-term availability before new production. For products with substantial future demand, consider whether a current MCU offers a better supply and software roadmap.
Recommended
Embedded educational and development platforms
MC9S08GT32CB can support educational embedded-systems platforms because it combines a recognizable 8-bit architecture, Flash program memory, RAM, GPIO, and multiple serial interfaces. Students can use the S08 core to learn interrupt handling, timer control, PWM, serial communication, and low-power-aware design without requiring a high-end processor. The 42-pin PDIP package is convenient for breadboard, through-hole training boards, and prototype repair. The verified data does not include development-tool details, so debugger, programmer, and toolchain compatibility must be checked separately. For classroom designs, provide clear power, reset, clock, and expansion documentation, and avoid assuming that a related S08GT32 package has identical pin assignments.
Recommended
Communication-assisted service equipment
The MC9S08GT32CB is also suited to service equipment where a technician needs serial diagnostics, local control, and flexible I/O. SCI can expose status and configuration commands, I2C or SPI can connect to sensors or service modules, and PWM can control indicators or actuators. The S08 core can manage a compact protocol while the watchdog timer helps recover from unexpected conditions. The 34 I/O pins support panel switches, relays, interlocks, and status lamps without requiring a large external interface IC. Before integrating it into safety- or service-critical equipment, verify reset behavior, low-voltage handling, peripheral timing, and electrical isolation from the exact manufacturer documentation. The obsolete status requires documented end-of-life sourcing.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08GT32CB — comparison, design guidance, and compliance information.
Selection Guide
Key Differentiators
- Verified 40 MHz S08 processing capability (vs MC9S08GT32ACFBE)
- 32 KB Flash and 2 KB RAM in a 42-pin PDIP (vs MC9S08GT32ACFDE)
- Integrated I2C, SCI, and SPI connectivity (vs MC9S08GT32ACFBE)
Design Notes
Validate the exact supply-voltage range, decoupling requirements, input thresholds, and I/O current limits from the MC9S08GT32CB datasheet before laying out a board. The verified excerpts identify the device as a 40 MHz, 8-bit MCU but do not provide operating-voltage or power-consumption values, so these must not be guessed. Place bulk and high-frequency decoupling capacitors according to the manufacturer guidance, keep the reset circuit close to the device, and confirm that external signals cannot exceed the specified limits.
Preserve the exact 42-pin PDIP footprint when maintaining or cloning an existing board. Verify the pin numbering orientation, notch or pin-1 marker, row spacing, and mechanical dimensions from the package drawing rather than from a related S08GT32 variant. Because the verified data does not provide the complete pin table, do not assign MCU functions to pins from memory. Confirm every peripheral multiplexing path and unused-pin configuration after the authoritative datasheet has been selected.
The obsolete lifecycle status is the primary sourcing risk for MC9S08GT32CB. Do not treat a distributor listing or a family-related MPN as proof of a drop-in replacement. Record the manufacturer, suffix, package, date code, condition, and traceability of purchased units, and qualify the exact lot where possible. A drop-in decision requires identical package mechanics, pin functions, electrical limits, memory behavior, clock requirements, and peripheral mapping; none of those conditions are fully proven by the supplied alternatives data.
Plan the board around the 34 verified I/O lines and the device's I2C, SCI, SPI, PWM, and reset functions. Separate sensitive sensor or communication routing from switching nodes and motor-drive traces, use short return paths, and provide adequate grounding. Software-selectable pullups and internal RESET or IRQ pullups can simplify some interfaces, but they should not be used to solve level conversion, high-current drive, or inadequate bus rise-time problems. Confirm the exact port registers and electrical limits in the manufacturer documentation.
No verified package power rating, junction-temperature limit, or thermal resistance was supplied for MC9S08GT32CB. Therefore, thermal design values cannot be calculated responsibly from the available data. During implementation, measure or estimate junction temperature using the actual clock activity, I/O loading, supply voltage, ambient temperature, PCB construction, and manufacturer thermal data. Through-hole PDIP construction may assist heat spreading, but it does not remove the need to enforce the device's verified operating and absolute-maximum limits.
Compliance Information
The supplied verified data identifies the MC9S08GT32CB as obsolete but does not provide RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification information. These fields remain unknown rather than being assumed.
