MC908QY4ACDTE - 8-bit HC08 MCU 4KB Flash 16-TSSOP | NXP
MPN: MC908QY4ACDTE ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.43 | $2.43 |
| 10 | $2.19 | $21.90 |
| 100 | $1.95 | $195.00 |
| 500 | $1.74 | $870.00 |
| 1,000 | $1.55 | $1,550.00 |
MC908QY4ACDTE Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripheral interfaces. The M68HC08 family is a Complex Instruction Set Computer (CISC) architecture designed for cost-sensitive embedded control. Within that taxonomy, the HC08Q sub-family targets ultra-low-cost applications where minimal pin count (8 or 16 pins) and small Flash footprint (1KB to 4KB) are critical. This hierarchical context - MCU -> 8-bit MCU -> CISC MCU -> M68HC08 -> HC08Q - places the MC908QY4ACDTE at the entry-level end of NXP's automotive-grade 8-bit portfolio.
Key features include a 4KB Flash program memory with in-circuit programming capability, an internal oscillator, hardware multiply/divide, a serial communications interface (SCI), and an analog-to-digital converter (ADC) with up to 10 channels. The device also integrates a timer interface module (TIM) for PWM and input-capture tasks, a keyboard interrupt module (KBI), and a low-power stop and wait mode that reduces quiescent consumption to microampere levels. The 16-pin TSSOP (0.65 mm pitch) footprint allows drop-in compatibility with the broader HC08Q family.
The architecture pairs a 16-bit index register and 8-bit accumulator with an HCF (high-level C-friendly) instruction set, enabling efficient code density and straightforward C compiler support. The integrated analog comparator and bandgap reference simplify analog front-end design, while the built-in security feature protects Flash contents from unauthorized read-out - a common requirement in cost-sensitive industrial systems.
Typical applications include appliance control (white goods, HVAC), automotive body electronics (window lifters, mirror controllers, seat adjusters), battery chargers, and consumer products such as toys, remote controls, and small motor controllers. The wide 5V supply range also suits industrial sensor interfaces.
When designing with this device, ensure adequate decoupling with a 100nF ceramic capacitor close to the VDD pin and consider the I/O source/sink current ratings when driving relays or LEDs directly. For new designs, evaluate whether the M68HC08 family is still in active production, as NXP has transitioned many customers to the S08 and Kinetis families.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on standalone manufacturer or distributor pages, providing an engineering decision view beyond raw spec repetition.
Drop-in alternatives for MC908QY4ACDTE — 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 MC908QY4ACDTE (same form factor and footprint) — differing in ADC, Core, Package, Operating Temperature, Program Memory.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC908QY2ACDTE
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →MC908QY1ACDTE
✅ Drop-In✓ In Stock
$3.05 / Unit
View Datasheet →MC908QT1ACDTE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC908QC8CDTE
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.2 / Unit
View Datasheet →MC908QY4ACDTE Maximum Ratings & Electrical Characteristics
| Core | M68HC08 (8-bit CISC) |
| Program Memory | 4 KB Flash |
| RAM | 128 bytes |
| Maximum Bus Frequency | 32 MHz (internal bus) |
| Supply Voltage | 4.5 V to 5.5 V |
| I/O Pins | 14 |
| ADC | 10-bit, up to 10 channels |
| Package | 16-TSSOP (0.65 mm pitch, 4.40 mm body) |
| Operating Temperature | -40C to +85C (industrial) |
| Timer Module | TIM (PWM, input capture) |
| Serial Interface | SCI (UART-compatible) |
| Internal Oscillator | Yes (trimmable) |
| ROM Type | Flash |
| Mounting Type | Surface Mount |
| Architecture | Von Neumann |
MC908QY4ACDTE Pin Configuration
| Pin 1 | PTD0/T1CLK — Port D bit 0 / Timer 1 clock input |
| Pin 2 | PTD1/T1CH0 — Port D bit 1 / Timer 1 channel 0 |
| Pin 3 | VDD — Positive supply voltage (4.5V-5.5V) |
| Pin 4 | VSS — Ground |
| Pin 5 | PTA0/KBI0 — Port A bit 0 / Keyboard interrupt 0 |
| Pin 6 | PTA1/KBI1 — Port A bit 1 / Keyboard interrupt 1 |
| Pin 7 | PTA2/KBI2 — Port A bit 2 / Keyboard interrupt 2 |
| Pin 8 | PTA3/KBI3/AD3 — Port A bit 3 / Keyboard interrupt 3 / ADC channel 3 |
| Pin 9 | PTA4/AD4 — Port A bit 4 / ADC channel 4 |
| Pin 10 | PTA5/AD5 — Port A bit 5 / ADC channel 5 |
| Pin 11 | PTB0/AD0 — Port B bit 0 / ADC channel 0 |
| Pin 12 | PTB1/AD1 — Port B bit 1 / ADC channel 1 |
| Pin 13 | PTB2/AD2 — Port B bit 2 / ADC channel 2 |
| Pin 14 | PTB3/AD6 — Port B bit 3 / ADC channel 6 |
| Pin 15 | PTB4/AD7/RXD — Port B bit 4 / ADC channel 7 / SCI RXD |
| Pin 16 | PTB5/TXD — Port B bit 5 / SCI TXD |
Typical Applications
MC908QY4ACDTE is suitable for 6 applications: Automotive Body Electronics, White Goods Appliance Control, Battery Chargers, Remote Controls and Toys, Industrial Sensor Interfaces, HVAC and Fan Control.
Automotive Body Electronics
The MC908QY4ACDTE is widely deployed in cost-sensitive automotive body modules such as window lifters, mirror adjusters, and seat controllers. Its 4 KB Flash comfortably fits the small control loops used in body controllers, and the 5V supply simplifies analog sensor interfaces. The 32 MHz internal bus and PWM-capable TIM module deliver precise motor control, while the 10-bit ADC reads position feedback sensors. Operating from -40C to +85C, the part handles under-hood thermal stress. The 14 GPIO pins can directly drive small relays and H-bridges through current-limiting resistors, reducing BOM cost versus Cortex-M0 designs.
Recommended
White Goods Appliance Control
Washing machines, dishwashers, refrigerators, and microwave ovens use the MC908QY4ACDTE as the central controller. The 4 KB Flash stores washing profiles, sensor calibration data, and user-interface state machines. The on-chip 10-bit ADC reads temperature (NTC), water level, and motor current sensors without external ADCs. The TIM module generates PWM for motor speed control and buzzer tones, while the SCI enables communication with the user-interface display board. Industrial temperature rating and 5V tolerance ease integration with legacy analog front-ends.
Recommended
Battery Chargers
Low-end NiCd, NiMH, and lead-acid battery chargers use the MC908QY4ACDTE for charge-profile control. The 10-bit ADC monitors battery voltage and charge current with adequate resolution for float-charge regulation, while the PWM-capable TIM module drives a buck converter at variable duty cycle. The 5V supply is ideal for the gate-driver and shunt-amplifier rails. The 4 KB Flash supports multiple charge profiles (Li-ion CC/CV, NiMH delta-V, lead-acid float) with lookup tables.
Recommended
Remote Controls and Toys
Cost-driven consumer products such as TV remotes, RC toys, and small appliances use the MC908QY4ACDTE for IR transmission, button scanning, and low-power standby. The KBI (keyboard interrupt) module wakes the MCU only when a key is pressed, achieving microamp-level standby current. The internal oscillator eliminates external crystals, reducing BOM. The 4 KB Flash stores IR protocols (RC5, NEC, SIRC), and the SCI/UART enables simple debug logging.
Recommended
Industrial Sensor Interfaces
Industrial sensor transmitters (pressure, flow, level) use the MC908QY4ACDTE for analog signal conditioning and 4-20 mA loop drive. The 10-bit ADC digitizes the sensor bridge output, while firmware linearizes and scales the measurement. The 5V supply supports a 4-20 mA loop-powered architecture with the MCU running from a linear regulator. The industrial temperature range and small TSSOP footprint suit compact field-mount transmitter enclosures.
Recommended
HVAC and Fan Control
Heating, ventilation, and air-conditioning (HVAC) controllers for residential and light commercial use the MC908QY4ACDTE to drive triac-controlled fan motors and read thermistor inputs. The TIM module's PWM output modulates fan speed with low-EMI filtering, and the ADC reads multiple temperature sensors. The 5V supply tolerates 24VAC-derived rails after rectification. The Flash-based architecture supports in-field firmware updates for new fan algorithms.
Recommended
Recommended Products Summary
Engineering reference data for MC908QY4ACDTE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC908QY4ACPE | MC908QY2ACDTE | MC908QY1ACDTE |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 16-TSSOP | 16-PDIP (through-hole) | 16-TSSOP - same | 16-TSSOP - same |
| Program Memory | 4 KB Flash | 4 KB Flash | 2 KB Flash (-50%) | 1 KB Flash (-75%) |
| RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Maximum Bus Clock | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
| I/O Pins | 14 | 14 | 14 | 14 |
| ADC | 10-bit, 10 channels | 10-bit, 10 channels | 10-bit, 10 channels | 10-bit, 8 channels |
Key Differentiators
- Lowest-cost 4 KB Flash MCU in 16-TSSOP from NXP (vs MC908QC8CDTE)
- Right-sized Flash for typical control loops (vs MC908QY1ACDTE)
- Surface-mount TSSOP versus through-hole PDIP (vs MC908QY4ACPE)
Design Notes
The MC908QY4ACDTE operates from a single 4.5V-5.5V supply. Place a 100nF ceramic decoupling capacitor within 5 mm of the VDD pin (pin 3) to suppress switching transients. For battery-powered designs, the 5V minimum rules out direct Li-ion operation; use a boost converter or a low-dropout 5V regulator from a 3.6V source. The internal stop-mode current is in the microampere range - sufficient for remote-control duty cycles but verify against your standby budget.
Route the analog ADC inputs (PTA4/PTA5/PTB0-PTB4) away from digital switching traces. Place a ground pour under the MCU, and connect the ADC reference voltage through a star topology back to VDD to minimize digital noise coupling. The TSSOP-16 thermal pad is not exposed (unlike larger TSSOP packages), so no thermal management is required beyond standard PCB design practices.
Do not exceed the 5.5V absolute maximum on VDD - even brief transients above 6V will damage the part. When programming Flash in-circuit, ensure that the IRQ pin is not held low during reset, which prevents entry into monitor mode. Always enable the security feature in production code to protect IP from external read-out via the background debug mode.
The SCI/UART pins (PTB4/RXD, PTB5/TXD) share port functions with ADC inputs and Port B GPIO. When using SCI, leave the ADC functions disabled in software to prevent channel contention. For long UART cables (>1m), add a 100 ohm series resistor and a small clamp diode to ESD-protect the RXD pin. The internal oscillator accuracy is typically +/- 2% over temperature, adequate for UART at 9600 baud but verify at higher rates.
Compliance Information
RoHS/REACH compliance not stated in the verified distributor data; NXP TSSOP variants post-2006 are generally RoHS-compliant - request certificate before production. AEC-Q100 qualification is not claimed for the industrial-grade MC908QY4ACDTE; AEC-Q100 variants exist in the S08 family.
