MC9S08GT8AMFBE - 8KB Flash S08 8-bit MCU, 40MHz QFP-44 | NXP
MPN: MC9S08GT8AMFBE ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.5 | $7.50 |
| 10 | $6.75 | $67.50 |
| 100 | $5.95 | $595.00 |
| 500 | $5.2 | $2,600.00 |
| 1,000 | $4.65 | $4,650.00 |
MC9S08GT8AMFBE Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash/RAM), and peripherals such as timers, ADC and communication interfaces. The MC9S08GT8AMFBE belongs to the 8-bit MCU hypernym hierarchy: microcontroller -> 8-bit microcontroller -> HCS08 family -> S08GT sub-family -> general-purpose low-power segment, and is commonly deployed where deterministic real-time behaviour, low quiescent draw and small code footprints are required.
Key features include a 40 MHz enhanced S08 core with up to 32 interrupt/reset sources, 8KB on-chip Flash, 1KB RAM, 34 software-configurable I/O ports, an internal timer autowake-up from Stop 2/Stop 3 modes drawing typically only 300 nA additional current, and a 20 nA power-down mode. The supply voltage range is 1.8 V to 3.6 V, supporting single-cell Li-ion and 3.3 V regulated rails. The 44-pin QFP (10x10 mm) is a surface-mount plastic quad flat pack with gull-wing leads.
The architecture uses a HC08-compatible instruction set with the added BGND instruction for background debug, making it compatible with NXP/Freescale CodeWarrior and P&E Multilink toolchains. Multiple power-management modes (Run, Wait, Stop 2, Stop 3) and fast wake-up times enable energy-efficient designs in battery-powered or energy-harvesting products. The S08GT family shares peripheral IP across members, simplifying code portability between MC9S08GT8A, MC9S08GT16A, MC9S08GT8 and MC9S08GT16 derivatives.
Typical applications include automotive body electronics (LIN slaves, sensor conditioning, lighting controllers), white goods and appliance user panels, battery-backed instrumentation, and low-cost industrial control modules. The -40 to 125C operating range (Viyrian listing marks it automotive) suits underhood measurements and in-service industrial deployments.
When designing with this part, ensure VDDA/VSSA decoupling is per datasheet, leave the BKGD/MS pin accessible for in-circuit debug, and verify Stop-mode wake-up source configuration before locking firmware. The S08GT family offers a low-risk migration path to larger Flash members (GT16) on the same QFP-44 footprint.
This page synthesizes distributor pricing, same-package drop-in alternatives drawn from the S08GT family, and design notes not found in the manufacturer datasheet. Authoritative sources: NXP product page and the DigiKey listing for MC9S08GT8AMFBE.
Drop-in alternatives for MC9S08GT8AMFBE — 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 MC9S08GT8AMFBE (same form factor and footprint) — differing in Package, Mounting Type, Number of I/O, Operating Temperature, RAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S08GT16AMFBE
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →MC9S08GT8ACFBE
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08GT16CFBE
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →MC9S08GT60AEFBE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S08GT16ACBE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S08GT8AMFBE Maximum Ratings & Electrical Characteristics
| Core Architecture | HCS08 (S08) 8-bit |
| CPU Frequency | 40 MHz |
| Instruction Set | HC08 with BGND |
| Program Memory (Flash) | 8 KB (8K x 8) |
| RAM | 1 KB |
| Supply Voltage | 1.8 V to 3.6 V |
| I/O Ports | 34 |
| Package | 44-QFP (PQFP, 10x10 mm) |
| Mounting Type | Surface Mount (Gull Wing) |
| Operating Temperature | -40C to +125C (Automotive grade) |
| Temperature Grade | Automotive |
| Power-Down Current | 20 nA (typical) |
| Stop-Mode Wake-up | Internal timer autowake-up, ~300 nA additional |
| Interrupt Sources | Up to 32 |
| Port Pullups | Software-selectable on inputs |
MC9S08GT8AMFBE Pin Configuration
| Pin 1 | PTC0 — Port C bit 0 (general I/O, peripheral pin) |
| Pin 2 | PTC1 — Port C bit 1 (general I/O, peripheral pin) |
| Pin 3 | PTC2 — Port C bit 2 (general I/O, peripheral pin) |
| Pin 4 | PTC3 — Port C bit 3 (general I/O, peripheral pin) |
| Pin 5 | PTC4 — Port C bit 4 (general I/O, peripheral pin) |
| Pin 6 | PTC5 — Port C bit 5 (general I/O, peripheral pin) |
| Pin 7 | VDDA — Analog supply voltage |
| Pin 8 | VSSA — Analog ground |
| Pin 9 | PTA0 — Port A bit 0 (general I/O) |
| Pin 10 | PTA1 — Port A bit 1 (general I/O) |
| Pin 11 | PTA2 — Port A bit 2 (general I/O) |
| Pin 12 | PTA3 — Port A bit 3 (general I/O) |
| Pin 13 | PTA4 — Port A bit 4 (general I/O) |
| Pin 14 | PTA5 — Port A bit 5 (general I/O) |
| Pin 15 | PTA6 — Port A bit 6 (general I/O) |
| Pin 16 | PTA7 — Port A bit 7 (general I/O) |
| Pin 17 | VDD — Digital supply voltage |
| Pin 18 | VSS — Digital ground |
| Pin 19 | PTB0 — Port B bit 0 (general I/O) |
| Pin 20 | PTB1 — Port B bit 1 (general I/O) |
| Pin 21 | PTB2 — Port B bit 2 (general I/O) |
| Pin 22 | PTB3 — Port B bit 3 (general I/O) |
| Pin 23 | PTB4 — Port B bit 4 (general I/O) |
| Pin 24 | PTB5 — Port B bit 5 (general I/O) |
| Pin 25 | PTB6 — Port B bit 6 (general I/O) |
| Pin 26 | PTB7 — Port B bit 7 (general I/O) |
| Pin 27 | PTD0 — Port D bit 0 (general I/O) |
| Pin 28 | PTD1 — Port D bit 1 (general I/O) |
| Pin 29 | PTD2 — Port D bit 2 (general I/O) |
| Pin 30 | PTD3 — Port D bit 3 (general I/O) |
| Pin 31 | PTD4 — Port D bit 4 (general I/O) |
| Pin 32 | PTD5 — Port D bit 5 (general I/O) |
| Pin 33 | PTD6 — Port D bit 6 (general I/O) |
| Pin 34 | PTD7 — Port D bit 7 (general I/O) |
| Pin 35 | BKGD/MS — Background debug / mode select |
| Pin 36 | RESET — Reset input (active low) |
| Pin 37 | PTE0 — Port E bit 0 (general I/O) |
| Pin 38 | PTE1 — Port E bit 1 (general I/O) |
| Pin 39 | XTAL — Crystal oscillator input |
| Pin 40 | EXTAL — External clock / crystal oscillator input |
| Pin 41 | VSS — Digital ground |
| Pin 42 | VDD — Digital supply voltage |
| Pin 43 | TCLK — Timer external clock input |
| Pin 44 | IRQ — External interrupt request (active low) |
Typical Applications
MC9S08GT8AMFBE is suitable for 6 applications: Automotive LIN Sensor Node, White-Goods User Interface Controller, Battery-Backed Sensor Hub, Industrial Lighting Controller, HVAC Actuator Module, Small Appliance Motor Control.
Automotive LIN Sensor Node
The MC9S08GT8AMFBE fits automotive LIN sensor nodes because it combines an 8-bit HCS08 core at 40 MHz, 34 software-configurable I/O pins and a 1.8-3.6 V supply range that interfaces directly to LIN transceiver rails. Its -40 to 125C automotive temperature grade matches cabin and underhood environments, while the 20 nA power-down current and 300 nA timer-autowake Stop modes let the node sleep between LIN frames, extending battery life in always-on body modules. The 8 KB Flash comfortably holds a LIN 2.x slave stack plus application code, and the S08 BGND instruction lets production units be flashed and calibrated in-circuit via the single-wire BKGD pin. Placed on a small PCB with a TJA1027 LIN transceiver and 3.3 V LDO, the MCU runs sensor conditioning, debounces inputs and responds to master polls deterministically. Compared with 32-bit alternatives, the GT8A keeps BOM cost and sleep current lower for high-volume sensor clusters.
Recommended
White-Goods User Interface Controller
The MC9S08GT8AMFBE is well-suited to white-goods user-interface boards (washing machines, dishwashers, ovens) where the MCU drives a segmented LCD, scans a keypad and runs a simple state machine. Its 34 I/O ports provide enough headroom for 4x4 key matrices plus LED row/column drive without external logic, and the 8 KB Flash holds a control loop plus UI firmware in a single chip. The 20 nA Stop-3 mode plus the internal autowake timer reduce standby draw to under 1 microamp, helping appliances meet ENERGY STAR idle budgets. The 1.8-3.6 V supply range lets the design share a 3.3 V rail with the LCD bias generator, and the S08 core's deterministic interrupt latency ensures button presses are never missed. Compared with a 16-bit MCU, the GT8A drops BOM cost while still providing adequate MIPS for UI plus safety logic. Migration to GT16A is straightforward if the UI firmware later grows beyond 8 KB.
Recommended
Battery-Backed Sensor Hub
The MC9S08GT8AMFBE works as a low-power sensor hub for battery-backed data loggers and remote telemetry nodes. Its 20 nA power-down current and approximately 300 nA autowake Stop current let a 3.6 V primary lithium cell run the node for years between battery swaps, while the 40 MHz S08 core wakes up, samples sensors, performs local averaging and returns to Stop quickly. The 1.8 V minimum supply enables direct connection to coin-cell rails, and the 34 I/O ports support multiple SPI/I2C sensor chains plus a UART link back to the host. The 8 KB Flash fits compact sensor-fusion or MODBUS-style firmware, and the BGND debug pin allows field firmware updates via a clip-on programmer. Compared with Cortex-M0+ alternatives, the GT8A draws less sleep current and costs less for simple 8-bit sensor conditioning tasks. The S08GT family shares peripheral headers, so firmware can be reused if the design later moves to GT16A.
Recommended
Industrial Lighting Controller
The MC9S08GT8AMFBE serves as a lighting-control MCU in industrial fixtures, where it dims LEDs via PWM, monitors occupancy sensors and drives DMX or 0-10 V analog control outputs. Its multiple timers support high-resolution PWM at audio-bypass frequencies (above 20 kHz) to avoid flicker and acoustic noise, while the 34 I/O ports handle keypad, status LEDs and DMX link hardware without external shift registers. The -40 to 125C automotive temperature grade gives ample margin for enclosed fixture thermal rise, and 8 KB Flash stores dimming curves, fade tables and DMX address mapping. The S08 BGND instruction supports in-fixture calibration without disassembly, lowering field-service cost. Compared with 32-bit lighting controllers, the GT8A reduces BOM cost and eliminates the need for an external watchdog. The QFP-44 footprint gives plenty of ground/power pins for clean EMC performance.
Recommended
HVAC Actuator Module
The MC9S08GT8AMFBE fits compact HVAC actuator modules such as damper drivers, smart valves and small BLDC/PWM controllers. The S08 core's deterministic interrupt latency is well matched to closed-loop control of stepper motors and proportional valves, while 34 I/O ports allow direct drive of H-bridge FET gates, encoder inputs and analog feedback channels. The 1.8-3.6 V supply supports 3.3 V operation, and the wide automotive temperature range ensures reliable operation in attic or plenum installations. With 8 KB Flash and 1 KB RAM, the MCU runs both the control loop and the LIN/CAN-style network stack for integration with the building automation bus. The 20 nA power-down mode is critical for battery-backed or energy-harvested designs that spend most of their time idle. Compared with mid-range 32-bit MCUs, the GT8A reduces cost for high-volume damper production.
Recommended
Small Appliance Motor Control
The MC9S08GT8AMFBE is a strong fit for small-appliance motor controllers in blenders, fans and pumps, where it commutates a brushless DC or universal motor using on-chip timers plus analog comparators. The S08 core at 40 MHz gives enough bandwidth for sensorless back-EMF zero-crossing routines, and the 8 KB Flash stores lookup tables, ramp profiles and protection firmware. The 34 I/O ports handle gate drivers, current-sense amplifiers and tachometer feedback, while the 1.8-3.6 V supply supports a single 3.3 V rail shared with the gate driver. The automotive temperature grade ensures reliable operation in kitchen environments with high ambient heat, and the QFP-44 package provides solid thermal dissipation for moderate-power motor loads. The S08 BGND debug mode lets production firmware be tuned without an expensive socket. Compared with Cortex-M0 alternatives, the GT8A trims cost and simplifies the BOM.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08GT8AMFBE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08GT16AMFBE | MC9S08GT8ACFBE | MC9S08GT16CFBE | MC9S08GT60AEFBE |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 44-QFP (PQFP, 10x10 mm) | 44-QFP (PQFP) - same | 44-QFP (PQFP) - same | 44-QFP (PQFP) - same | 44-QFP (PQFP) - same |
| Flash Memory | 8 KB | 16 KB | 8 KB | 16 KB | 60 KB |
| RAM | 1 KB | 2 KB | 1 KB | 2 KB | 4 KB |
| CPU Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Core Architecture | S08 (HCS08) | S08 (HCS08) | S08 (HCS08) | S08 (HCS08) | S08 (HCS08) |
| Supply 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 | 1.8 V to 3.6 V |
| Temperature Grade | Automotive (-40 to 125C) | Automotive (-40 to 125C) | Commercial (0 to 70C) | Commercial (0 to 70C) | Automotive (-40 to 125C) |
| Power-Down Current | 20 nA | 20 nA | 20 nA | 20 nA | 20 nA |
| I/O Ports | 34 | 34 | 34 | 34 | 34 |
Key Differentiators
- Automotive-grade in a 44-QFP, low BOM cost (vs MC9S08GT8ACFBE)
- Higher Flash headroom for future firmware growth (vs MC9S08GT16AMFBE)
- Wider memory headroom for complex stacks (vs MC9S08GT60AEFBE)
Design Notes
Place a 100 nF ceramic decoupling capacitor on each VDD/VSS pin pair as close to the package as possible, plus a bulk 4.7 uF or 10 uF tantalum/ceramic near the MCU. VDDA/VSSA should have a separate 100 nF decoupling cap and a ferrite bead or small resistor between VDD and VDDA if the analog reference must reject digital switching noise. Keeping analog and digital grounds star-connected at the MCU's VSS pins improves ADC and analog comparator performance.
Route the BKGD/MS line to a header or test pad so the S08 single-wire background debugger can attach without removing the MCU. Keep the trace short (under 50 mm) and away from switching power or motor drive traces. If the design must lock RESET high internally, ensure firmware does not disable the COP watchdog unintentionally, and provide a manual reset jumper to recover from a bad firmware lockout. The QFP-44 package benefits from a ground pour on the top layer stitched to the bottom ground plane with multiple vias for thermal dissipation.
When migrating between S08GT family members (GT8A vs GT16A vs GT60A), verify that unused peripheral pins are properly configured as outputs or inputs with pullups enabled to avoid excess current draw. The 20 nA power-down figure assumes all ports are properly terminated. Also note that some S08 derivatives use the same package but with different IRQ pin locations; always cross-check the device-specific pin-out table before laying out a universal PCB across GT8A/GT16/GT60.
Compliance Information
Compliance data not explicitly stated in the verified web data; the Viyrian listing marks the part as Automotive temperature grade but does not declare AEC-Q100 qualification. RoHS/REACH status should be confirmed on the NXP product page or via distributor material declarations before volume procurement.
