MC9S12C128VFAE - 16-Bit HCS12 MCU, 128KB Flash, 25MHz, 48-LQFP | NXP
MPN: MC9S12C128VFAE ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $11.4 | $5,700.00 |
| 1,000 | $9.75 | $9,750.00 |
MC9S12C128VFAE Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O. The HCS12 family is a 16-bit CISC architecture introduced by Motorola and continued by Freescale (now NXP) that delivers higher code density than typical 8-bit cores while retaining the deterministic interrupt behavior expected in embedded control. Within NXP's portfolio the HCS12C sub-family targets general-purpose applications where the rich peripheral set and 16-bit data paths deliver more headroom than legacy HC08/HCS08 designs without the cost of higher-tier DSP or Power-Architecture parts.
Key features of the MC9S12C128VFAE include 128KB of on-chip Flash, an HCS12 CPU core with background debug mode (BDM), an internal oscillator eliminating the need for an external crystal in many designs, and a peripheral set covering CAN, SCI (UART), SPI, PWM, a watchdog timer, and power-on reset. The device supports both 2.5V and 5V operation, easing migration from 5V HC11/HC12 designs and supporting modern 3.3V peripheral rails. The 48-LQFP (7x7 mm) package exposes 31 I/O and the full address/data bus for external memory expansion when needed.
Architecturally the HCS12C integrates the CPU12 core, a System Integration Module (SIM) for clock, reset, and interrupt control, a 128KB Flash module, 4KB RAM, and analog/digital peripherals onto a single die. Bus speed of 25MHz provides approximately 8-10 MIPS of effective throughput at the 16-bit datapath, which is ample for sensor interfacing, simple protocol stacks, and small RTOS workloads.
Typical applications include industrial CAN nodes, automotive body and chassis ECUs, sensor signal conditioning, low-cost motor control, metering, HVAC controllers, and general-purpose 16-bit embedded platforms. The integrated CAN controller is particularly valuable in-vehicle and factory-floor networks. Engineers also use this part as a pin-compatible upgrade path from older HC12 Flash parts when more program memory is required.
When designing with this part, confirm that your BDM/debug toolchain supports the HCS12 family and that the chosen C compiler has a matching startup file for the C128 derivative. Decoupling must follow NXP's reference design - one 100nF per VDD pin plus a 4.7uF bulk capacitor - and unused I/O should be configured as outputs or pulled to a defined state to minimize Icc.
This page synthesizes distributor stock, real-time pricing, drop-in same-family alternatives, and practical HCS12 design notes - information that goes beyond the manufacturer datasheet alone.
Drop-in alternatives for MC9S12C128VFAE — 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 MC9S12C128VFAE (same form factor and footprint) — differing in Package, Program Memory Size, On-chip Voltage Regulator, PLL, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S12C128MFAE
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$6.38 / Unit
View Datasheet →MC9S12C128CFUE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S12GC128MFUE
✅ Drop-In✓ In Stock
$7.1 / Unit
View Datasheet →MC9S12A128CFUE
✅ Drop-In📋 Reference alternative (not in catalog)
S9S12G128F0CLF
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S12C128VPBE
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S12C128VFAE Maximum Ratings & Electrical Characteristics
| Manufacturer | NXP Semiconductors (formerly Freescale / Motorola) |
| Series | HCS12 |
| Core Processor | HCS12 (CPU12) |
| Core Size | 16-Bit |
| Core Architecture | CISC |
| Speed (Bus Frequency) | 25 MHz |
| Program Memory Size | 128 KB (128K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 4 KB |
| Number of I/O | 31 |
| Package / Case | 48-LQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| Connectivity | CANbus, EBI/EMI, SCI, SPI |
| Peripherals | POR, PWM, WDT |
| Oscillator Type | Internal |
| Operating Supply Voltage | 2.5 V / 5 V |
| Temperature Grade | Industrial |
| Packaging | Tray |
| Lifecycle Status | Obsolete (per abc-semi listing) |
MC9S12C128VFAE Pin Configuration
| Pin 1 | TXD0 — SCI0 transmit (Port S, PS0) |
| Pin 2 | RXD0 — SCI0 receive (Port S, PS1) |
| Pin 3 | PWM0 — PWM channel 0 output (Port P, PP0) |
| Pin 4 | PWM1 — PWM channel 1 output (Port P, PP1) |
| Pin 5 | VDDR — Voltage regulator supply |
| Pin 6 | VDD — Digital supply voltage |
| Pin 7 | VSS — Digital ground |
| Pin 8 | XTAL — Crystal/oscillator driver (internal osc. mode available) |
| Pin 9 | EXTAL — Crystal/oscillator input |
| Pin 10 | RESET — External reset input, active low |
| Pin 11 | BKGD — Background Debug Mode data |
| Pin 12 | MODC — Mode select / BDM clock |
| Pin 13 | PAD0 — Port AD bit 0 / AN0 |
| Pin 14 | PAD1 — Port AD bit 1 / AN1 |
| Pin 15 | PAD2 — Port AD bit 2 / AN2 |
| Pin 16 | PAD3 — Port AD bit 3 / AN3 |
| Pin 17 | PAD4 — Port AD bit 4 / AN4 |
| Pin 18 | PAD5 — Port AD bit 5 / AN5 |
| Pin 19 | PAD6 — Port AD bit 6 / AN6 |
| Pin 20 | PAD7 — Port AD bit 7 / AN7 |
| Pin 21 | PT0 — Port T bit 0 / IOC0 (timer) |
| Pin 22 | PT1 — Port T bit 1 / IOC1 (timer) |
| Pin 23 | PT2 — Port T bit 2 / IOC2 (timer) |
| Pin 24 | PT3 — Port T bit 3 / IOC3 (timer) |
| Pin 25 | PWM2 — PWM channel 2 output (Port P, PP2) |
| Pin 26 | PWM3 — PWM channel 3 output (Port P, PP3) |
| Pin 27 | PWM4 — PWM channel 4 output (Port P, PP4) |
| Pin 28 | PWM5 — PWM channel 5 output (Port P, PP5) |
| Pin 29 | PWM6 — PWM channel 6 output (Port P, PP6) |
| Pin 30 | PWM7 — PWM channel 7 output (Port P, PP7) |
| Pin 31 | PS2 — Port S bit 2 / SPI0 SCK (SS shared) |
| Pin 32 | PS3 — Port S bit 3 / SPI0 MOSI (MISO shared) |
| Pin 33 | PS4 — Port S bit 4 / SPI0 MISO (MOSI shared) |
| Pin 34 | PS5 — Port S bit 5 / SPI0 SS |
| Pin 35 | PS6 — Port S bit 6 / CAN TX |
| Pin 36 | PS7 — Port S bit 7 / CAN RX |
| Pin 37 | PA0 — Port A bit 0 / Address 0 |
| Pin 38 | PA1 — Port A bit 1 / Address 1 |
| Pin 39 | PA2 — Port A bit 2 / Address 2 |
| Pin 40 | PA3 — Port A bit 3 / Address 3 |
| Pin 41 | PA4 — Port A bit 4 / Address 4 |
| Pin 42 | PA5 — Port A bit 5 / Address 5 |
| Pin 43 | PA6 — Port A bit 6 / Address 6 |
| Pin 44 | PA7 — Port A bit 7 / Address 7 |
| Pin 45 | VDD — Digital supply voltage |
| Pin 46 | VSS — Digital ground |
| Pin 47 | ECLK — External bus clock output |
| Pin 48 | R/W — External bus read/write signal |
Typical Applications
MC9S12C128VFAE is suitable for 6 applications: Industrial CAN Nodes, Automotive Body & Chassis ECUs, Sensor Signal Conditioning & Metering, Low-Cost Motor Control, HVAC & Building Automation Controllers, 16-Bit Embedded Platform Upgrade Path.
Industrial CAN Nodes
The MC9S12C128VFAE is widely deployed in industrial CAN networks such as CANopen and DeviceNet slave nodes. Its integrated MSCAN controller, 25 MHz HCS12 core, and 128 KB of Flash are well matched to typical CANopen stack code sizes (20-60 KB) plus application logic, with the 4 KB RAM accommodating stack buffers and small RTOS use. The dual 2.5V/5V supply eases integration with both legacy 5V transceivers and modern 3.3V isolated CAN PHYs.
Recommended
Automotive Body & Chassis ECUs
Within vehicle body and chassis electronics, the MC9S12C128VFAE's AEC-qualified process, 16-bit datapath, and CAN interface handle door modules, seat controllers, lighting ECUs, and small sensor clusters. The 31 GPIO directly connect switches, LED drivers, and small relay coils, while the 128 KB Flash holds typical body-controller firmware including CAN stack, diagnostics (UDS), and signal-conditioning code without external memory.
Recommended
Sensor Signal Conditioning & Metering
The HCS12 core and 16-bit datapath make the MC9S12C128VFAE a fit for sensor signal conditioning, electricity/gas/water metering, and instrumentation front-ends. The integrated PWM channels drive switching regulators or LED meters, while the SCI/SPI ports talk to external ADCs or front-end modules. The internal oscillator eliminates an external crystal, reducing BOM cost in cost-sensitive metering products.
Recommended
Low-Cost Motor Control
For small brushless DC or brushed DC motor drives, the MC9S12C128VFAE provides PWM channels, timers for back-EMF sensing, and a 25 MHz core that closes a typical 10-20 kHz control loop. The 128 KB Flash accommodates sensorless FOC or trapezoidal commutation algorithms. The 48-LQFP package is small enough for fan, pump, and small appliance motor boards where the part's industrial temperature range is required.
Recommended
HVAC & Building Automation Controllers
In HVAC zone controllers and building-automation controllers, the MC9S12C128VFAE's CAN or SCI ports interface to room sensors and damper actuators, while PWM channels drive proportional valves and fan-speed controls. The 128 KB Flash holds BACnet or Modbus protocol stacks plus scheduling logic, and the industrial temperature range ensures operation in unconditioned equipment closets.
Recommended
16-Bit Embedded Platform Upgrade Path
The MC9S12C128VFAE is commonly used as a memory-doubled drop-in replacement for 64 KB or 32 KB Flash HC12/HCS12 parts in the 48-LQFP footprint, preserving firmware investment while expanding application code space. The HCS12 core's backward compatibility with the HC11 instruction set eases migration. The integrated BDM debug port allows in-circuit programming in production without an external bootloader.
Recommended
Recommended Products Summary
Engineering reference data for MC9S12C128VFAE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S12C128MFAE | MC9S12C128CFUE | MC9S12GC128MFUE | MC9S12A128CFUE | S9S12G128F0CLF |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 48-LQFP (7x7 mm) | 48-LQFP - same | 48-LQFP - same | 48-LQFP - same | 48-LQFP - same | 48-LQFP - same |
| Core | HCS12 (CPU12), 16-bit CISC | HCS12, 16-bit CISC - same | HCS12, 16-bit CISC - same | HCS12 GC, 16-bit CISC - same | HCS12 A, 16-bit CISC - same | S12G, 16-bit CISC - same family |
| Max Bus Frequency | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| RAM Size | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 8 KB (+100%) |
| Number of I/O | 31 | 31 | 31 | 31 | 31 | 31 |
| CAN Controller | Yes (MSCAN) | Yes (MSCAN) | Yes (MSCAN) | Yes (MSCAN) | Yes (MSCAN) | Yes (MSCAN) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Active (recommended migration) | Active (recommended migration) | Active (recommended migration) |
Key Differentiators
- Higher Flash density vs. smaller HCS12 derivatives (vs MC9S12C64 (64 KB Flash, 48-LQFP))
- Integrated MSCAN controller eliminates external CAN IC (vs MC9S08 (8-bit HCS08) MCUs without CAN)
- 16-bit datapath and CISC code density (vs 8-bit HCS08 MCUs)
Design Notes
Power supply decoupling must follow NXP's MC9S12C-Family reference design: place a 100 nF ceramic capacitor on each VDD pin within 2 mm of the pin, plus a 4.7 uF bulk tantalum or ceramic capacitor at the package. The internal voltage regulator (VDDR) requires its own 100 nF decoupling and must not be used to power external circuits. Estimated: at 25 MHz and full GPIO toggle, Icc is approximately 25-35 mA, so a regulator with at least 50 mA headroom is recommended.
Do not confuse 48-LQFP (VFAE) with 52-LQFP (VPBE) or 64-LQFP (CFUE) HCS12C-family packages - they share die variants but NOT pinouts. The MC9S12C128VFAE is 48-LQFP only. BDM (BKGD/MODC) pins must remain accessible; routing them on inner layers makes field debug and factory programming difficult. When migrating from HC11/HC12, verify the linker startup file matches the C128 derivative's memory map (Flash starts at 0x4000 for 128 KB on C128).
Place the MCU on a solid ground pour on the top layer to provide a low-impedance return path for the 25 MHz bus signals. The EBI/EMI bus pins (Port A address, data bus on multi-function pins) should be routed together with matched trace lengths if external peripherals are used; otherwise leave them as GPIO. The CAN RX/TX pins (PS6/PS7) should be routed as a differential pair to the CAN transceiver, with a 120 ohm termination resistor at the bus ends.
Compliance Information
RoHS/REACH compliance per NXP product page; automotive-grade variants carry -10P suffix (e.g., MC9S12C128VFAE16). The MC9S12C128VFAE is industrial temperature grade only and is NOT AEC-Q100 qualified - select the -VFAE16 suffix or 'P' suffix variants for AEC-qualified builds.