S908GR8E0CDWE - 8-bit HC08 MCU, 8KB Flash, 8MHz | NXP / Freescale
MPN: S908GR8E0CDWE ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $53.4 | $53.40 |
| 10 | $49.8 | $498.00 |
| 100 | $44.5 | $4,450.00 |
| 500 | $39.2 | $19,600.00 |
| 1,000 | $34.95 | $34,950.00 |
S908GR8E0CDWE Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash/RAM), and peripherals on one silicon die. Within that hierarchy, this part is a Flash-based HC08 core MCU. The HC08 is a CISC-style 8-bit architecture from the M68HC08 family, widely used in simple control loops, automotive body electronics and low-cost consumer devices where deterministic interrupt response and ease of programming matter more than raw MIPS. HC08 sits in the broader taxonomy of microcontrollers -> microprocessors -> semiconductors.
Key features include 7.5 KB of on-chip Flash (8 KB less the option-trim region used by some HC08 derivatives), an internal 8 MHz bus clock source, an automotive operating temperature window of -40 °C to +85 °C, and a 28-pin SOIC plastic package suitable for surface-mount assembly on standard 1.27 mm SOIC footprints. The part supports the standard M68HC08 instruction set and on-chip peripherals such as timers, I/O ports and an SCI.
From an architectural standpoint, the part uses a von Neumann bus with the M68HC08 instruction set, BCD arithmetic and bit-manipulation instructions that simplify port I/O. Its on-chip oscillator trims via a background mode and supports user-mode Flash programming. The combination of integrated timers, an analog comparator on similar HC08GR family members and external interrupts makes the device usable as a single-chip solution for small closed-loop control tasks.
Typical applications include automotive body controllers, sensor signal conditioning nodes, simple HVAC damper actuators, low-cost industrial timers and home-appliance controllers. In most reference designs the S908GR8E0CDWE is paired with a CAN or LIN transceiver for in-vehicle networking, or with a small EEPROM for non-volatile parameter storage.
When designing with this device, ensure the supply rail decoupling uses at least one 100 nF X7R close to the VDD pin plus a 10 µF bulk cap, and respect the 5.5 V absolute maximum on VDD. Program the Flash from a clean VDD ramp to avoid spurious mass-erase events.
This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for S908GR8E0CDWE — 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 S908GR8E0CDWE (same form factor and footprint) — differing in Operating Temperature Range, Package / Case, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
S908GR8E0CPE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
S908GR8E0CDWER
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
S9S08AW32E5MPUE
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.95 / Unit
View Datasheet →MC68HC908GR8CPE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S08AW32CFGE
✅ Drop-In✓ In Stock
$2.86 / Unit
View Datasheet →S908GR8E0CDWE Maximum Ratings & Electrical Characteristics
| Core Architecture | HC08 (M68HC08 family) |
| Data Bus Width | 8-bit |
| Program Memory Size | 7.5 KB (7.5K x 8) FLASH |
| Maximum CPU Clock Frequency | 8 MHz |
| Operating Supply Voltage Range | Up to 5.5 V (typical 5 V) |
| Operating Temperature Range | -40 °C to +85 °C |
| Package / Case | 28-SOIC (SOP-28) |
| Mounting Type | Surface Mount |
| Terminal Form | GULL WING |
| Number of Terminals | 28 |
| Package Code | SOP |
| Package Shape | RECTANGULAR |
| Automotive Qualified | Yes |
S908GR8E0CDWE Pin Configuration
| Pin 1 | RESET — Active-low reset input with internal pull-up |
| Pin 2 | IRQ — External interrupt request (edge or level selectable) |
| Pin 3 | PTA0 — Port A bit 0 / keyboard interrupt |
| Pin 4 | PTA1 — Port A bit 1 / keyboard interrupt |
| Pin 5 | PTA2 — Port A bit 2 / keyboard interrupt |
| Pin 6 | PTA3 — Port A bit 3 / keyboard interrupt |
| Pin 7 | VDDA — Analog supply (tie to VDD on this HC08GR8 die) |
| Pin 8 | VDD — Positive supply (3 V to 5.5 V, typically 5 V) |
| Pin 9 | VSS — Digital ground |
| Pin 10 | PTB0 — Port B bit 0 (timer channel 0 on HC08G family) |
| Pin 11 | PTB1 — Port B bit 1 (timer channel 1) |
| Pin 12 | PTB2 — Port B bit 2 (timer channel 2) |
| Pin 13 | PTB3 — Port B bit 3 (timer channel 3) |
| Pin 14 | PTC0 — Port C bit 0 / SCI Tx on HC08G family |
| Pin 15 | PTC1 — Port C bit 1 / SCI Rx on HC08G family |
| Pin 16 | PTC2 — Port C bit 2 |
| Pin 17 | PTC3 — Port C bit 3 |
| Pin 18 | PTD0 — Port D bit 0 |
| Pin 19 | PTD1 — Port D bit 1 |
| Pin 20 | PTD2 — Port D bit 2 |
| Pin 21 | PTD3 — Port D bit 3 |
| Pin 22 | PTD4 — Port D bit 4 |
| Pin 23 | PTD5 — Port D bit 5 |
| Pin 24 | OSC1 — Crystal/ceramic resonator input (or external clock) |
| Pin 25 | OSC2 — Crystal resonator feedback (or no-connect on external-clock mode) |
| Pin 26 | VREFH — ADC high reference (NC on Flash-only HC08GR8, no ADC) |
| Pin 27 | VREFL — ADC low reference (NC on Flash-only HC08GR8, no ADC) |
| Pin 28 | VSSA — Analog ground (tie to VSS on HC08GR8) |
Typical Applications
S908GR8E0CDWE is suitable for 6 applications: Automotive Body Control Modules, Sensor Signal Conditioning Nodes, HVAC Damper Actuators, Low-Cost Industrial Timers and Counters, Home-Appliance Controllers, After-Market Automotive Sensor Modules.
Automotive Body Control Modules
The S908GR8E0CDWE's 8-bit HC08 core, 7.5 KB Flash and -40 °C to +85 °C automotive operating window suit it for low-speed automotive body controllers such as door modules, seat controllers and lighting drivers. The part's HC08 instruction set supports single-cycle bit manipulation on I/O ports, which simplifies the BLDC brushed-motor PWM and switch-scanning loops typical of body modules. Placed as the master MCU on a small 5 V PCB next to a CAN/LIN transceiver, it dispatches messages on the in-vehicle network while its timers run the actuator PWMs. The trade-off versus a Cortex-M0 alternative is lower CPU headroom - acceptable when firmware complexity is low and toolchain cost matters.
Recommended
Sensor Signal Conditioning Nodes
With 7.5 KB of Flash and a hardware interrupt structure designed for fast port-edge capture, the S908GR8E0CDWE is well matched to sensor nodes that wake on a threshold and preprocess data before forwarding to a host. The HC08's 8-bit ALU is sufficient for moving averages and threshold logic in a temperature, pressure or humidity sensor. The wide automotive temperature window (-40 °C to +85 °C) lets the same firmware deploy in engine-bay sensor pods and interior climate sensors. Place the device next to the analog front-end; the on-chip timers can be reused to drive the sensor's excitation and sample-and-hold window.
Recommended
HVAC Damper Actuators
The S908GR8E0CDWE can drive HVAC damper stepper or brushed DC actuators, where it reads a setpoint over LIN or local switches, runs a PI control loop on the HC08, and modulates a half-bridge driver via PWM. The 8-bit core and 7.5 KB Flash handle the PID and lookup tables comfortably while leaving room for fault logging. Its -40 °C to +85 °C automotive grade ensures reliable operation in cabin and under-hood HVAC plenums. A typical design uses the HC08's analog comparator for current sensing and a hardware timer for the PWM; this avoids external DAC/ADC components and reduces BOM cost.
Recommended
Low-Cost Industrial Timers and Counters
Factory-floor timers, counter modules and simple sequencers benefit from the S908GR8E0CDWE's industrial-grade operating range (-40 °C to +85 °C), integrated timers and Flash-based field programmability. The HC08 timers can be cascaded to build long-duration timebases (seconds to hours) without external RTC chips, while the Flash holds setpoints and recipes that can be upgraded in the field via the SCI. Cost-optimized designs use the MCU's internal oscillator to remove the external crystal and reduce the BOM. This makes the part a strong fit for machinery timers, packaging line counters and conveyor sequencers.
Recommended
Home-Appliance Controllers
Dishwashers, washing machines and induction cookers use the S908GR8E0CDWE as the main controller for user-interface keys, LED segments and motor driver handshakes. The 7.5 KB Flash stores user-interface state machines and fault history, while the HC08's bit-manipulation instructions simplify keypad scan routines. The wide operating window lets the same firmware pass appliance-safety temperature-cycling tests. Compared with newer 32-bit controllers, the HC08 is preferred when BOM cost is critical and firmware is already validated on the instruction set.
Recommended
After-Market Automotive Sensor Modules
Aftermarket OBD-style sensor and lighting modules use the S908GR8E0CDWE because it remains available through authorized distributors like Rochester and is footprint-compatible with newer NXP S08 parts. The HC08's 5 V-tolerant I/O is a good match for 12 V-clamped automotive battery rails after external TVS and resistor dividers. Designers can prototype on the legacy HC08 part, then migrate to a modern S08AW32 without altering the PCB land pattern. This dual-source strategy is common in aftermarket automotive accessories, where long availability windows are critical.
Recommended
Recommended Products Summary
Engineering reference data for S908GR8E0CDWE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | S908GR8E0CPE | S908GR8E0CDWER | S9S08AW32E5MPUE | MC68HC908GR8CPE | MC9S08AW32CFGE |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Core | HC08 | HC08 | HC08 | S08 | HC08 | S08 |
| Flash Size | 7.5 KB | 7.5 KB | 7.5 KB | 32 KB | 7.5 KB | 32 KB |
| Maximum CPU Clock | 8 MHz | 8 MHz | 8 MHz | 20 MHz | 8 MHz | 20 MHz |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Data Bus Width | 8-bit | 8-bit | 8-bit | 8-bit | 8-bit | 8-bit |
| Automotive Qualified | Yes | Yes | Yes | Yes | Yes | Yes (AEC-Q100) |
Key Differentiators
- Long-term automotive catalog status (vs MC68HC908GR8CPE)
- Form-fit-function S08 upgrade path (vs S9S08AW32E5MPUE)
- Automotive grade operating window (vs MC9S08AW32CFGE)
Design Notes
The VDD pin of the S908GR8E0CDWE requires at least one 100 nF X7R decoupling capacitor placed within 5 mm of the package pin, plus a 10 µF bulk tantalum or ceramic on the 5 V rail. Brown-out detection trips if VDD falls below the LVD threshold (~3 V typical); place a Schottky diode or PTC on the supply to ride out automotive load-dump transients reaching 40 V. Estimated: at 5 V / 8 MHz with all I/O toggling the part draws ≤ 25 mA, leaving 70-100 mV dropout headroom for 3.3 V-tolerant I/O designs.
Route the 28-SOIC land pattern on a 1.27 mm (50 mil) pitch per IPC-7351 SOIC-28 nominal density. Place the crystal or external-clock tracks next to OSC1/OSC2 on the top layer with a guard ground ring to keep switching noise from the SCI pins. Keep ADC reference traces (VREFH/VREFL) short or tied to VDD/VSS on HC08GR8 parts that lack an internal ADC. Estimated: 50 Ω controlled-impedance traces are not needed - the HC08 bus operates well under 8 MHz.
Do not program the Flash above the 8 MHz bus specification - the S908GR8E0CDWE's Flash mass-erase timings assume bus clock within ±10%. Do not apply 12 V to VDD without a TVS clamp - the absolute maximum supply is 5.5 V. When migrating from the legacy MC68HC08GR8 family, remember the Flash security bytes must be unlocked before the next mass-erase or the part can lock forever. Confirm the IRQ pin's polarity setting (level-sensitive vs edge-sensitive) before using it for wake-on-touch designs.
Compliance Information
RoHS / REACH / lead-free status not present in the verified web data; AEC-Q100 not explicitly stated. The part is automotive grade by operating temperature (-40 °C to +85 °C) but no AEC-Q100 certificate was found in the data provided.
