MC9S12DT128CPV - HCS12 16-Bit 25MHz MCU 128KB Flash | NXP | 112-LQFP
MPN: MC9S12DT128CPV ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.95 | $1,395.00 |
| 500 | $11.4 | $5,700.00 |
| 1,000 | $9.85 | $9,850.00 |
MC9S12DT128CPV Overview
HCS12 microcontrollers are 16-bit CISC devices that originated as the evolution of the Motorola HC11 architecture, retaining code compatibility while adding background debug mode (BDM), a 16-bit CPU register set, and a sophisticated interrupt controller. As members of the broader microcontroller category, HCS12 devices sit below 32-bit ARM Cortex-M parts in flash-memory density but above 8-bit 8051/AVR devices in computational throughput, making them a fit for cost-sensitive real-time embedded control rather than high-throughput applications like graphics or wireless stacks.
Key features of the MC9S12DT128CPV include 128KB Flash organized as 128K x 8, an integrated CAN 2.0 module for in-vehicle networking, pulse-width modulation outputs for motor or lighting drivers, and a watchdog timer for fail-safe recovery. The 8KB on-chip SRAM is sufficient for protocol stacks and small buffers, while the 2KB EEPROM supports non-volatile parameter storage (CAN IDs, calibration data, fault logs). The HCS12 core executes most instructions in a single bus cycle, giving effective throughput near 25 MIPS at the rated 25 MHz E-clock.
Architecturally, the device combines the HCS12 CPU12 core, a multi-channel ADC (referenced in the family datasheet), an enhanced capture/timer module, and the BDLC/SCI/SPI/IIC blocks behind a standard HCS12 peripheral bridge. The part is fully pin-compatible with other members of the MC9S12D-Family, letting designers swap memory and peripheral options without board rework. According to the family datasheet, the design targets automotive multiplexing where CAN bandwidth and deterministic interrupt response are key.
Typical applications for the MC9S12DT128CPV include automotive body control modules, gateway and multiplexing nodes, HVAC control panels, instrument clusters, and industrial CAN-based sensor hubs. The combination of integrated CAN, ample Flash, and the LQFP-112 footprint also suits bench-test equipment and factory automation peripherals where automotive-grade peripherals are repurposed.
Design consideration: because the device is sourced primarily through the legacy/obsolete channel (rated Obsolete by some distributors), verify long-term supply via authorized franchises or licensed aftermarket suppliers before committing to new designs. Plan a Freescale/NXP S12X or S12 MagniV successor as the modernization path, keeping in mind that those successors usually require firmware migration despite pin family compatibility.
This page consolidates distributor pricing, parametric alternatives, design notes, and AEO-optimized engineering content that goes beyond raw datasheet restatement to accelerate BOM qualification and obsolescence planning.
Drop-in alternatives for MC9S12DT128CPV — 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 MC9S12DT128CPV (same form factor and footprint) — differing in Operating Temperature, Supply Voltage, RAM Size, ADC, Bus Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S12DT128CPVE
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S12DT256CPV
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S12DT128CPV
✅ Drop-In✓ In Stock
$9.85 / Unit
View Datasheet →MC9S12A128CPV
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S12DP512CPV
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$16.75 / Unit
View Datasheet →MC9S12XDT256MAL
✅ Drop-In✓ In Stock
$15.85 / Unit
View Datasheet →MC9S12DT128CPV Maximum Ratings & Electrical Characteristics
| Manufacturer | NXP USA Inc. |
| Series | HCS12 |
| Core Processor | HCS12 (CPU12) |
| Core Size | 16-Bit |
| Core Architecture | CISC |
| Speed (E-clock) | 25 MHz |
| Program Memory Size | 128 KB (128K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 8 KB |
| EEPROM Size | 2 KB |
| Number of I/O | 91 |
| Connectivity | CANbus, I2C, SCI, SPI |
| Peripherals | PWM, WDT |
| Oscillator Type | External (per datasheet family) |
| Supply Voltage | 2.5 V / 5 V (family) |
| Operating Temperature | -40C to +85C (industrial) |
| Package / Case | 112-LQFP (20x20 mm) |
| Mounting Type | Surface Mount |
| Terminal Form | Gull Wing |
MC9S12DT128CPV Pin Configuration
| Pin 1 | PE0 — Port E bit 0 / IRQ (per family datasheet) |
| Pin 2 | PE1 — Port E bit 1 / XIRQ (per family datasheet) |
| Pin 3 | PE2 — Port E bit 2 / TCLK |
| Pin 4 | PE3 — Port E bit 3 / MODC |
| Pin 5 | PE4 — Port E bit 4 / ECLK |
| Pin 6 | PE5 — Port E bit 5 |
| Pin 7 | PE6 — Port E bit 6 |
| Pin 8 | PE7 — Port E bit 7 |
| Pin 9 | VSSR — Reset VSS |
| Pin 10 | VDDR — Reset VDD |
| Pin 11 | BKGD — Background Debug Mode pin |
| Pin 12 | RESET — External reset input, active low |
| Pin 13 | TEST — Test mode pin, tie low in normal operation |
| Pin 14 | VDD — 5V/2.5V digital supply (per family) |
| Pin 15 | VSS — Digital ground |
| Pin 16 | VDDPLL — PLL supply pin (per family) |
| Pin 17 | XFC — PLL loop filter capacitor pin |
| Pin 18 | EXTAL — External clock/crystal pin |
| Pin 19 | XTAL — Crystal pin |
| Pin 20 | VSSPLL — PLL ground |
| Pin 21-30 | PA0-PA7 / PB0-PB7 / PAD group — Port A and Port B mixed I/O per family datasheet |
| Pin 31-40 | PJ0-PJ7 / PK0-PK7 — Port J and Port K GPIO/interrupt group |
| Pin 41-60 | PT0-PT7 / CAN/SCI/SPI — Port T plus dedicated peripherals (TCLK, PWM, IOC) - mapping per datasheet |
| Pin 61-80 | PM0-PM7 / PN0-PN7 — Port M and Port N GPIO/IO per datasheet |
| Pin 81-100 | PS0-PS7 / PP0-PP7 / PWM — Port S/P/P peripheral group |
| Pin 101-112 | PAD remaining / VDD / VSS — Remaining I/O and additional supply/ground pins per datasheet |
Typical Applications
MC9S12DT128CPV is suitable for 6 applications: Automotive Body Control Module (BCM), Automotive Gateway / Multiplexing Node, HVAC Control Panel Electronics, Instrument Cluster / Auxiliary Display Driver, Industrial CAN-Based Sensor Hub, Engineered Replacement / Legacy Service Board.
Automotive Body Control Module (BCM)
The MC9S12DT128CPV fits BCM designs because it integrates a CAN 2.0 controller, two SCI, one SPI and one I2C - the four buses that a body module needs to talk to door nodes, mirror motors and lighting drivers. Its 128KB Flash is enough for a BCM-style RTOS plus diagnostic UDS stack, while the 8KB RAM hosts CANmailbox buffers and debounce tables. The 112-LQFP package puts all 91 I/O on a single PCB layer, easing the body-module wiring harness interface. Compared with discrete logic plus a separate CAN controller, the part consolidates the application into one IC and shrinks Bill-of-Materials. Designers should pair it with a TJA1050 or TLE6250 CAN transceiver on the bus pins, and a 5V LDO such as NXP's MC33761 for stable VDD during cranking pulses.
Recommended
Automotive Gateway / Multiplexing Node
In automotive gateways the MC9S12DT128CPV acts as a CAN-to-CAN or CAN-to-LIN bridge, offloading protocol translation from a higher-tier ECU. The HCS12 core at 25 MHz leaves headroom for software CAN filtering at ~500 kbps on both channels, and the 8KB RAM is sufficient to buffer short messages while awaiting transmission on the slower bus. The 2KB EEPROM holds CAN identifier routing tables that production lines can set via BDM. Because the part is part of the MC9S12D family, designers can drop in MC9S12DT256CPV without PCB rework when higher throughput is required. A typical gateway board also uses a 16 MHz crystal with the on-chip PLL to derive 25 MHz bus clock; EMI is contained by the package's solid ground plane under the die.
Recommended
HVAC Control Panel Electronics
The MC9S12DT128CPV is well matched to HVAC control panels where the MCU drives seven-segment or dot-matrix displays, scans key matrices, and PWM-modulates blower fan motors. The PWM module supports variable-speed fan control with duty resolution suited for cabin acoustic targets, and 91 available I/O cover the keypad scan plus LED indication without external expanders. The -40C to +85C industrial temperature grade spans cabin climate, while the 16-bit CISC core executes scan-loop math easily within the 100 ms refresh budget. The 112-LQFP package keeps the entire panel electronics under 25 mm^2 plus display, enabling slim bezel industrial designs. Designers typically pair the part with NXP's MC33996 for smart-power outputs and a low-cost SPI OLED display for the user interface.
Recommended
Instrument Cluster / Auxiliary Display Driver
Instrument clusters and tractor/marine auxiliary displays often use the MC9S12DT128CPV as the rendering and bus controller, since it can refresh stepper-motor gauges at 100 Hz while polling the CAN body network for vehicle speed and RPM. Its 8KB RAM is sufficient to buffer up to four gauge step-counter tables and a small frame buffer, while 128KB Flash holds a JPEG-style warning-icon library plus the cluster graphics. The integrated CAN frees an external transceiver slot, and the 5V tolerant I/O drives bipolar stepper coils directly when paired with VN750 or BTS432E drivers. Compared with 32-bit Cortex-M alternatives, the part wins on cost-effectiveness for non-graphical gauges. The LQFP-112 footprint is also convenient for hand-repair and field rework.
Recommended
Industrial CAN-Based Sensor Hub
Outside the cabin, the MC9S12DT128CPV serves as a CAN-based sensor hub for factory automation, oil/gas telemetry, and remote pumping stations where extended -40C to +85C operation and CAN isolation are required. The 16-bit core is enough to run a CANopen or DeviceNet slave stack in 128KB Flash with 8KB RAM headroom for process-image (PDO) buffers. The PWM and timer channels drive analog-style actuator outputs proportional to received CAN PDOs, and the watchdog timer provides fail-safe recovery during brownouts. The 112-LQFP package fits a 50 x 70 mm sensor hub PCB alongside a CAN isolator and a DC/DC. Compared with discrete 8051-based designs, this part delivers HCS12 interrupt latency that simplifies deterministic CAN scheduling.
Recommended
Engineered Replacement / Legacy Service Board
Because the MC9S12DT128CPV is marked obsolete, repair depots and manufacturers of long-life equipment (military, heavy machinery, locomotive) keep it as a service-stock part for legacy boards. Field service organizations rely on the device to refresh ATE and production testers originally designed in the early 2000s. The 112-LQFP package and HCS12 instruction set allow engineers to bring up identical test firmware on rebuilt units without re-validation. Licensed aftermarket suppliers like Rochester Electronics pre-qualify date-code inventory so service boards pass long-term aging tests. Engineering teams building replacement boards often design around the pin-compatible MC9S12DT256CPV when firmware headroom is needed for modernization patches.
Recommended
Recommended Products Summary
Engineering reference data for MC9S12DT128CPV — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S12DT128CPVE | MC9S12DT256CPV | MC9S12A128CPV | MC9S12DP512CPV | MC9S12XDT256MAL |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 112-LQFP (20x20) | 112-LQFP (20x20) | 112-LQFP (20x20) | 112-LQFP (20x20) | 112-LQFP (20x20) | 112-LQFP |
| Core | HCS12 (CPU12, 16-bit) | HCS12 (16-bit) | HCS12 (16-bit) | HCS12 (16-bit) | HCS12 (16-bit) | S12X (16-bit + XGATE) |
| Speed | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 40 MHz |
| Flash Size | 128 KB | 128 KB | 256 KB | 128 KB | 512 KB | 256 KB |
| RAM Size | 8 KB | 8 KB | 12 KB | 8 KB | 14 KB | 12 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB | 4 KB |
| CAN Module | Yes (1x CAN 2.0) | Yes (1x CAN) | Yes (1x CAN) | No (A-family lacks CAN) | Yes (CAN) | Yes (CAN) |
| Lifecycle | Obsolete | Obsolete | Obsolete (varies by date code) | Obsolete | Obsolete | Obsolete / Not recommended for new |
Key Differentiators
- Pin-compatible Flash upgrade option within the same NXP family (vs MC9S12DT256CPV)
- Industry-standard HCS12 toolchain and BDM ecosystem (vs Cross-brand 16-bit MCUs)
- Integrated CAN 2.0 for body-electronics network nodes (vs MC9S12A128CPV (A-family))
Design Notes
Run the MC9S12DT128CPV from a low-noise 5V LDO such as NXP MC33761 with 100 nF ceramic plus 10 µF bulk on VDD, and keep the PLL filter capacitor on XFC sized per the family datasheet. During crank/crash scenarios, automotive supply can dip below 5 V; design the rail to hold VDD >= 4.5 V until the LDO drops out, then route a reset to the supervisor so the MCU restarts cleanly.
The 112-LQFP at 0.5 mm pitch needs clean fan-out - use 0.2 mm/0.2 mm trace/spacing, four inner layers as GND + VDD, and place 0402 bypass capacitors directly under the package on each VDD/VSS pair. The crystal trace from EXTAL/XTAL must be short, with the load caps within 5 mm; long traces add jitter to the PLL-derived 25 MHz bus clock.
Estimated: BDM pin BKGD must be pulled high during reset (typically 4.7 kohm to VDD) - leaving it floating can lock the part in BDM by accident or, conversely, prevent BDM entry. The TEST pin must be tied low. Driving RESET while VDD is below 4.5 V risks race conditions; tie RESET to a TLE4471 or equivalent supervisor. Also confirm date code and lead finish RoHS requirements before pulling parts from distribution for a new order.
Compliance Information
RoHS/lead-finish status depends on date code; verify per lot. Not specifically AEC-Q100 qualified at the part family level per the original NXP/Freescale MC9S12DT128 datasheet - for automotive OEM builds confirm compliance separately.
