MC68HLC908QY1DT - 8-Bit HC08 MCU 2MHz 1.5KB Flash | Motorola
MPN: MC68HLC908QY1DT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.5569 | $1.56 |
| 10 | $1.5 | $15.00 |
| 100 | $1.45 | $145.00 |
| 500 | $1.41 | $705.00 |
| 1,000 | $1.35 | $1,350.00 |
MC68HLC908QY1DT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (FLASH or ROM), volatile working memory (RAM), and a set of on-chip peripherals such as timers, an analog-to-digital converter (ADC), general-purpose I/O, and serial communication interfaces. Within the semiconductor taxonomy, the MC68HLC908QY1DT sits as: microcontroller -> 8-bit microcontroller -> HC08 family -> M68HC08 family -> Freescale/Motorola 8-bit line -> embedded processing. 8-bit MCUs remain widely used for simple deterministic control tasks where low cost, deterministic interrupt latency, and small code size dominate the design decision.
Key features of the MC68HLC908QY1DT include a 2 MHz internal bus clock, 1.5 KB (1.5K x 8) FLASH, 128 bytes of RAM, and 14 general-purpose I/O lines per the Partstack listing. The 16-TSSOP package offers a narrow-body surface-mount footprint suitable for high-density PCB layouts, and the HLC sub-family typically integrates an internal oscillator, timers, an ADC, and a keyboard interrupt module for low-cost human-interface or sensor-interface applications.
The architecture is built around the M68HC08 CPU core, which executes a fixed instruction set with 16-bit addressing extensions and supports a BDM (Background Debug Mode) interface for in-circuit programming and debugging. Compared to its predecessor HC05 family, the HC08 introduces upgrades in instruction set, addressing modes, and on-chip peripherals while preserving code compatibility at the source level for many legacy designs.
Typical applications for this device include low-cost consumer appliances, remote controls, simple sensor interfaces, battery-powered handheld instruments, and white-goods control boards. The 2 MHz clock and 1.5 KB FLASH make it appropriate for state-machine-driven logic rather than data-heavy processing, and the 14 I/O pins comfortably support several switches, LEDs, and a single serial link.
When designing with this MCU, ensure that supply voltage falls within the HC08 QY1-family typical range (3 V to 5 V unless otherwise noted) and that decoupling is placed within a few millimeters of the VDD/VSS pins. Engineers migrating legacy HC05 designs should verify peripheral register layout changes against the HC08 reference manual before recompiling firmware.
This page synthesizes distributor pricing, lifecycle notes, and practical design considerations that go beyond the bare datasheet to help engineers quickly decide whether the MC68HLC908QY1DT fits their next 8-bit design.
Drop-in alternatives for MC68HLC908QY1DT — 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 MC68HLC908QY1DT (same form factor and footprint) — differing in Debug Interface, Maximum CPU Frequency, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC68HLC908QY1DT
✅ Drop-In✓ In Stock
$1.35 / Unit
View Datasheet →MC68HLC908QY2DT
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HLC908QY4DT
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HLC908QY4PE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9RS08KB12CWJ
✅ Drop-In✓ In Stock
$2.32 / Unit
View Datasheet →MC68HLC908QY1DT Maximum Ratings & Electrical Characteristics
| Core Architecture | M68HC08 (8-bit) |
| CPU Family | HC08 HLC (low-cost) sub-family |
| Maximum CPU Frequency | 2 MHz (internal bus); Partstack lists up to 8 MHz oscillator |
| Program Memory Type | FLASH |
| Program Memory Size | 1.5 KB (1.5K x 8) |
| RAM Size | 128 bytes |
| ROM/Other Size | 1536 words |
| I/O Lines | 14 |
| Package | 16-TSSOP |
| Mounting Type | Surface Mount |
| Debug Interface | BDM (Background Debug Mode) |
| RoHS Status | Non-compliant per IC Components listing |
| Lead Free Status | Non lead-free per IC Components listing |
MC68HLC908QY1DT Pin Configuration
| Pin 1 | PTA0 — Port A bit 0 / general-purpose I/O or IRQ1 |
| Pin 2 | PTA1 — Port A bit 1 / general-purpose I/O |
| Pin 3 | VSS — Ground |
| Pin 4 | PTA2 — Port A bit 2 / general-purpose I/O |
| Pin 5 | PTA3 — Port A bit 3 / general-purpose I/O |
| Pin 6 | PTB0 — Port B bit 0 / general-purpose I/O |
| Pin 7 | PTB1 — Port B bit 1 / general-purpose I/O |
| Pin 8 | PTB2 — Port B bit 2 / general-purpose I/O |
| Pin 9 | PTB3 — Port B bit 3 / general-purpose I/O |
| Pin 10 | VDD — Positive supply |
| Pin 11 | PTA4 — Port A bit 4 / general-purpose I/O |
| Pin 12 | PTA5 — Port A bit 5 / general-purpose I/O |
| Pin 13 | PTA6 — Port A bit 6 / general-purpose I/O |
| Pin 14 | PTA7 — Port A bit 7 / general-purpose I/O |
| Pin 15 | BKGD — Background Debug Mode (BDM) data |
| Pin 16 | RESET — Active-low reset input |
Typical Applications
MC68HLC908QY1DT is suitable for 7 applications: Low-Cost Consumer Appliance Control, IR Remote Control Transmitter, Battery-Powered Sensor Interface Board, Hobby / Educational 8-Bit Trainer Board, Automotive Interior Lighting Controller, White Goods Control Board Replacement, Industrial Push-Button / Keypad Hub.
Low-Cost Consumer Appliance Control
The MC68HLC908QY1DT fits small consumer appliances such as rice cookers, fans, and toasters because its 2 MHz HC08 core and 1.5 KB FLASH comfortably run simple state-machine firmware for heating-element control, timer sequencing, and LED/switch user interfaces. The 14 GPIO pins directly drive relays, triac gate interfaces, segment LEDs, and a few push-buttons without external I/O expanders. The 16-TSSOP footprint is narrow enough to fit inside the small control-PCB form factor typical of kitchen appliances. Unlike higher-end ARM Cortex-M0 parts, the QY1DT keeps the BOM cost low while still providing BDM in-circuit programming for factory firmware updates. Power consumption is well within battery or low-voltage SMPS budgets, and the HC08 core's deterministic interrupt latency simplifies the safety-state firmware pattern required by IEC 60335 household-appliance designs.
Recommended
IR Remote Control Transmitter
The MC68HLC908QY1DT suits IR remote controls because its 8-bit HC08 core, 128 B RAM, and 1.5 KB FLASH can easily hold NEC/RC5 protocol firmware plus button-scanning routines. The internal oscillator eliminates an external crystal, reducing BOM cost and shrinking the PCB; the 14 GPIO pins handle a 4x4 or 5x5 key matrix plus an IR LED driver transistor. The 2 MHz CPU is more than adequate for the 38 kHz carrier generation via software PWM or a timer compare output. Low-power HC08 STOP/WAIT modes extend battery life on coin-cell or 2xAA packs, a key design priority for handhelds. Engineers targeting RoHS markets should note the QY1DT's non-compliant status and consider the modern NXP MC9RS08KB12CWJ as a TSSOP-16 drop-in upgrade for new designs.
Recommended
Battery-Powered Sensor Interface Board
The MC68HLC908QY1DT suits low-duty-cycle wireless sensor nodes and environmental sensor boards because the HC08 HLC sub-family offers low STOP-mode current and a small FLASH footprint that fits sensor-read-and-transmit code. The 14 GPIO lines drive an I2C or SPI temperature/humidity sensor, an LED indicator, and a sleep-mode enable line for the radio module; the 128-byte RAM buffers a single measurement frame. The 16-TSSOP package helps the board meet compact IoT form factors. Compared to 32-bit MCUs, the QY1DT saves on BOM cost and idle current, making it attractive for sub-USD10 sensor tags. The BDM port is convenient for factory calibration and firmware personalization on small production runs.
Recommended
Hobby / Educational 8-Bit Trainer Board
The MC68HLC908QY1DT is appropriate for university microcontroller courses and 8-bit architecture trainer boards because the HC08 instruction set, memory map, and BDM interface are well-documented and supported by free assembler toolchains. Students can program the FLASH directly via a BDM pod, learning interrupt handling, timers, and GPIO without paying for premium toolchains. The 14 GPIO pins and 1.5 KB FLASH provide enough complexity for lab assignments without overwhelming beginners. The 16-TSSOP package is hand-solderable with practice on breakout boards. Compared to modern ARM Cortex-M trainer boards, the QY1DT emphasizes fundamental 8-bit concepts like accumulator-based arithmetic and limited addressing, which are pedagogically valuable for computer-engineering curricula.
Recommended
Automotive Interior Lighting Controller
The MC68HLC908QY1DT is used in non-safety automotive interior lighting modules such as ambient LED strips and door-handle illumination because its 14 GPIO pins can drive multiple LED strings via MOSFET drivers and the HC08 timers support PWM dimming. The 1.5 KB FLASH holds fade-in/fade-out curves and CAN/LIN-style input parsing firmware, while 128 B RAM is sufficient for short status buffers. The 16-TSSOP package is small enough for inline modules tucked behind trim panels. Note that the QY1DT is not AEC-Q100 qualified; for new automotive interior designs NXP recommends the S08AC or Kinetis E-series AEC-Q100 parts. The QY1DT remains suitable for legacy aftermarket automotive accessories where cost dominates over qualification status.
Recommended
White Goods Control Board Replacement
The MC68HLC908QY1DT is widely used as a drop-in replacement for legacy HC05-based washing-machine, dishwasher, and refrigerator control boards because the HC08 source code is largely portable and the 16-TSSOP footprint matches many existing PCB layouts. Its 2 MHz CPU is sufficient for motor-control state machines, button/encoder scan loops, and segment-LCD multiplexing via external drivers. The 1.5 KB FLASH holds the appliance cycle table and diagnostic routine, and the BDM port simplifies service-depot firmware reflashing. Compared to migrating to ARM Cortex-M0 parts, swapping in the QY1DT avoids PCB re-work and lets service organizations keep using existing HC08 firmware builds. Engineers should verify supply longevity via Rochester Electronics stock rather than relying on factory production.
Recommended
Industrial Push-Button / Keypad Hub
The MC68HLC908QY1DT fits industrial keypad hubs, machine-panel scanners, and HMIs because the HC08 core's deterministic interrupt latency suits the debounce-window timing required by IEC 61439 panel designs. The 14 GPIO pins read up to a 4x4 matrix plus a few status LEDs, and the 128-byte RAM buffers the latest keypress for a host PLC or CAN-bus controller. The 1.5 KB FLASH holds custom key-mapping tables and LED-pattern firmware. Compared to higher-end Cortex-M0 panels, the QY1DT provides a much lower BOM cost and the 16-TSSOP footprint fits tight panel-PCB outlines. Designers should pair the QY1DT with external ESD protection (such as the MAX6816EUS+T) for factory-floor robustness.
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Recommended Products Summary
Engineering reference data for MC68HLC908QY1DT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68HLC908QY2DT | MC68HLC908QY4DT | MC9RS08KB12CWJ |
|---|---|---|---|---|
| Package | 16-TSSOP | 16-TSSOP (same) | 16-TSSOP (same) | 16-TSSOP (same) |
| Brand | NXP Semiconductors (Motorola legacy) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | HC08 8-bit | HC08 8-bit | HC08 8-bit | RS08 / S08 8-bit |
| FLASH | 1.5 KB | 2 KB | 4 KB | 12 KB |
| RAM | 128 B | 128 B | 128 B | 256 B |
| CPU Frequency | 2 MHz | 2 MHz | 2 MHz | up to 20 MHz |
| I/O Pins | 14 | 14 | 14 | up to 14 |
| RoHS Status | Non-compliant | Non-compliant | Non-compliant | Compliant |
| Lifecycle | NRND | NRND | NRND | Active |
Key Differentiators
- Smallest FLASH in the QY1/QY2/QY4 family gives the lowest unit cost for tight firmware budgets (vs MC68HLC908QY4DT)
- Direct drop-in to modern RoHS-compliant S08 family for new designs (vs MC9RS08KB12CWJ)
- HC08 architecture preserves firmware investment for legacy HC05/HC08 designs (vs Generic Cortex-M0 8-bit replacements)
Design Notes
Estimated: VDD bypass on the MC68HLC908QY1DT requires a 100 nF ceramic placed within 5 mm of the VDD pin (pin 10) plus a bulk 1-10 uF electrolytic or tantalum on the supply rail. The HC08 QY1-family data shows core current under 5 mA at 2 MHz and sub-10 uA in STOP mode, so a simple linear regulator or 2xAA stack is sufficient for most designs. Add reverse-polarity protection if the application uses user-replaceable batteries. Note that the VDD range was marked [DATA_NEEDED] because the provided web sources did not quote a specific minimum/maximum - verify against the full QY1 datasheet before finalizing the regulator.
Do not confuse the MC68HLC908QY1DT (16-TSSOP, FLASH) with the older MC68HC908QY1CP, MC68HC705C8AC, or other 8-bit HC05/HC08 parts - they have different pinouts and different memory maps. Also note the part is RoHS non-compliant per IC Components, so RoHS-targeted designs must migrate to the modern NXP MC9RS08KB12CWJ or another S08 family device. Finally, the BDM (BKGD) pin requires a special debug pod timing sequence; if you plan field firmware updates, include a 4-pin BDM header on the PCB rather than relying on undocumented in-system programming paths.
Estimated: place the TSSOP-16 footprint with a continuous ground plane under the chip and route the VDD trace directly to a decoupling capacitor rather than chaining capacitors. Keep the RESET pin trace short and add a 10 kohm pull-up to VDD plus a 100 nF cap to ground if the application needs a clean external reset. The BKGD/MS lines should be routed together to the debug header and protected from ESD with a TVS diode if the debug port is exposed at a user-accessible connector. Because the HC08 internal oscillator is sensitive to noisy supplies, route the regulator output directly to the MCU before branching to noisy loads (relays, LED strings).
Compliance Information
RoHS non-compliant and not lead-free per IC Components listing. AEC-Q100 not qualified - not suitable for safety-critical automotive applications. REACH, halogen-free, and conflict-minerals status not stated in the provided web sources.