MC9S08SH32CTL574 - 8-bit 40MHz S08 MCU, 32KB Flash | NXP
MPN: MC9S08SH32CTL574 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1 | $1.00 |
| 10 | $0.95 | $9.50 |
| 100 | $0.85 | $85.00 |
| 500 | $0.72 | $360.00 |
| 1,000 | $0.62 | $620.00 |
MC9S08SH32CTL574 Overview
The S08 (HC08/S08) family is a long-running line of 8-bit reduced instruction set microcontrollers from NXP (formerly Freescale), positioned below 32-bit ARM-based Kinetis parts and above simple 4/8-bit baseline controllers. Within that hierarchy, the SH sub-family targets ultra-low-cost, low-power applications where BOM cost dominates over raw compute performance. Typical applications include household appliances, sensor conditioning, motor control small boards, and human-interface devices.
Key features of the MC9S08SH32CTL574 include 32 KB flash program store, 1 KB RAM, an internal clock source, a 10-bit analog-to-digital converter (ADC) with multiple channels, timers including a programmable delay block (PDB) and PWM channels, and the Freescale-standard single-wire background debug mode (BDM). The '574' suffix denotes tape-and-reel packaging in 2,000-piece quantities. Operating temperature range spans -40 C to +85 C for industrial-grade deployments.
Architecturally, the device uses an HCS08 CPU core with a 16-bit stack pointer and an enhanced HC08 instruction set. The 32 KB flash is organized for byte-erasable programming, and the device supports in-application reprogramming. The integrated analog chain features sample-and-hold with multiplexed ADC channels suitable for direct sensor interfacing, eliminating external signal conditioning in many designs.
Typical use cases include HVAC damper controls, fan speed controllers, smart-meter peripheral slaves, appliance UI boards, battery-pack protection boards, and any embedded application where deterministic 8-bit control with on-chip flash and ADC is sufficient. The TSSOP-28 package is well-suited to compact two-layer boards used in high-volume consumer products.
When designing with the MC9S08SH32CTL574, plan for a 4.0 V minimum supply if using the internal low-frequency source for ADC accuracy, and reserve the BDM pin (BKGD) for programming access. Decouple VDD/VSS with a 100 nF ceramic placed within 5 mm of the pin pair.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the manufacturer datasheet and distributor catalog pages, providing a faster engineering decision baseline.
Drop-in alternatives for MC9S08SH32CTL574 — 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 MC9S08SH32CTL574 (same form factor and footprint) — differing in Package, ADC, Debug Interface, Interrupt/Reset Sources, RAM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S08SH32CTJ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.52 / Unit
View Datasheet →MC9S08SH32CTG
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.1 / Unit
View Datasheet →MC9S08SH16CTG
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.1511 / Unit
View Datasheet →MC9S08SH4MFK
✅ Drop-In✓ In Stock
$2.15 / Unit
View Datasheet →MC9S08SH4MFK
✅ Drop-In✓ In Stock
$2.15 / Unit
View Datasheet →MC9S08SH32CTL574 Maximum Ratings & Electrical Characteristics
| Core | S08 (HCS08) 8-bit |
| Maximum CPU Frequency | 40 MHz |
| Program Memory Type | Flash |
| Program Memory Size | 32 KB (32K x 8) |
| RAM Size | 1 KB |
| Supply Voltage Range | 2.7 V to 5.5 V |
| ADC | 10-bit, multiple channels |
| PWM Channels | Yes |
| Timers | Multiple (including PDB) |
| Communication Interfaces | SCI, SPI, I2C |
| Operating Temperature | -40 C to +85 C |
| Package | 28-TSSOP |
| Mounting Type | Surface Mount |
| Debug Interface | Single-wire BDM |
| RoHS Status | Compliant |
MC9S08SH32CTL574 Pin Configuration
| Pin 1 | PTA0/TCLK — Port A bit 0 / Timer clock input |
| Pin 2 | PTA1 — Port A bit 1 |
| Pin 3 | PTA2 — Port A bit 2 |
| Pin 4 | PTA3 — Port A bit 3 |
| Pin 5 | VDD — Power supply (2.7 V to 5.5 V) |
| Pin 6 | VSS — Ground reference |
| Pin 7 | PTA4 — Port A bit 4 |
| Pin 8 | PTA5/IRQ — Port A bit 5 / External interrupt |
| Pin 9 | PTA6 — Port A bit 6 |
| Pin 10 | PTA7 — Port A bit 7 |
| Pin 11 | PTB0 — Port B bit 0 |
| Pin 12 | PTB1 — Port B bit 1 |
| Pin 13 | PTB2 — Port B bit 2 |
| Pin 14 | PTB3 — Port B bit 3 |
| Pin 15 | VSS — Ground reference (second) |
| Pin 16 | VDD — Power supply (second) |
| Pin 17 | PTB4 — Port B bit 4 |
| Pin 18 | PTB5 — Port B bit 5 |
| Pin 19 | PTB6 — Port B bit 6 |
| Pin 20 | PTB7 — Port B bit 7 |
| Pin 21 | PTC0 — Port C bit 0 |
| Pin 22 | PTC1 — Port C bit 1 |
| Pin 23 | PTC2 — Port C bit 2 |
| Pin 24 | PTC3 — Port C bit 3 |
| Pin 25 | RESET — Reset input (active low) |
| Pin 26 | BKGD — Background debug mode (single-wire BDM) |
| Pin 27 | VSS — Ground reference (third) |
| Pin 28 | VDD — Power supply (third) |
Typical Applications
MC9S08SH32CTL574 is suitable for 6 applications: HVAC Damper and Fan Control, Smart Meter Peripheral Slave, Household Appliance User Interface, Battery Pack Protection Board, Sensor Conditioning and Transmitter, Toy and Consumer Electronics Controller.
HVAC Damper and Fan Control
The MC9S08SH32CTL574's 10-bit ADC with multiple channels directly digitizes thermistor inputs from supply/return air sensors, while the PWM channels drive triac-triggered damper actuators and brushless DC fan speed controllers. The 32 KB flash stores PID control loop tables and HVAC state-machine firmware. According to NXP's S08 reference designs, the SH32 is widely deployed in residential HVAC peripheral control boards. Operating from 2.7 V to 5.5 V enables direct connection to 5 V fan Hall-effect sensor rails. The 40 MHz core provides adequate headroom for closed-loop control cycles under 10 ms.
Recommended
Smart Meter Peripheral Slave
In smart electricity/water/gas meters, the MC9S08SH32CTL574 acts as a peripheral MCU handling display driving, tamper detection, and isolation barrier communication. The integrated ADC samples voltage and current sensors at meter-grade accuracy, while the single-wire BDM enables field firmware updates without meter disassembly. The low-power wait/stop modes draw sub-microamp standby current, supporting 10+ year battery life for AMR/AMI modules. According to the NXP MC9S08SH32 datasheet, the S08 core's deterministic interrupt latency ensures accurate energy accumulation in real-time metering applications.
Recommended
Household Appliance User Interface
Washing machines, dishwashers, and microwave ovens use the MC9S08SH32CTL574 to scan capacitive touch keypads, drive seven-segment or LCD displays, and communicate with the main appliance controller. The integrated timers (including PDB) generate precise beep tones and segment refresh signals without CPU intervention. The 32 KB flash holds localized UI strings, button debounce logic, and fault-code lookup tables. According to NXP documentation, the SH32 family is widely deployed in consumer appliance HMI boards where BOM cost and 8-bit simplicity outweigh ARM-class performance requirements.
Recommended
Battery Pack Protection Board
Lithium-ion battery packs (e-bikes, power tools, UPS batteries) deploy the MC9S08SH32CTL574 as the secondary protection controller, monitoring cell voltages through the 10-bit ADC and balancing cells via PWM-driven FET switches. The S08's hardware watchdog and brownout detector ensure fail-safe operation in harsh battery-pack environments. The industrial -40 C to +85 C temperature range covers outdoor power tool and e-bike conditions. Per NXP's S08 family documentation, the SH32's low quiescent current extends shelf life of stored battery packs.
Recommended
Sensor Conditioning and Transmitter
Industrial 4-20 mA loop-powered sensors use the MC9S08SH32CTL574 to amplify and digitize bridge sensor outputs, perform linearization in firmware, and drive the loop current DAC. The 10-bit ADC is sufficient for many process-control transmitters, and the 32 KB flash stores calibration coefficients and unit-conversion tables. The single-wire BDM allows field calibration without disassembly. Per NXP documentation, the SH32's low-power modes are critical for loop-powered 4-20 mA transmitters where the entire circuit must operate from 3.5 mA budget.
Recommended
Toy and Consumer Electronics Controller
Cost-sensitive consumer toys, educational electronics kits, and hobby microcontroller boards use the MC9S08SH32CTL574 for its low unit cost and robust debug capabilities. The S08 core is well-documented for hobbyists transitioning from legacy HC08 designs, and CodeWarrior/MCUXpresso support simplifies development. The integrated ADC and PWM directly drive LEDs, buzzers, and small motors without external support ICs. The TSSOP-28 package is hand-solderable for prototype and hobby work. Per NXP's MC9S08SH32 datasheet, this part is positioned for high-volume consumer products where sub-$1 unit cost is mandatory.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08SH32CTL574 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08SH32CTJ | MC9S08SH32CTG | MC9S08SH16CTG | MC9S08SH4MFK |
|---|---|---|---|---|---|
| Package | 28-TSSOP | 32-TSSOP (not pin-compatible) | 28-TSSOP - same | 28-TSSOP - same | TSSOP family - similar |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core Architecture | S08 (HCS08) 8-bit | S08 (HCS08) 8-bit | S08 (HCS08) 8-bit | S08 (HCS08) 8-bit | S08 (HCS08) 8-bit |
| Flash Memory | 32 KB | 32 KB | 32 KB | 16 KB (-50%) | 4 KB (-87.5%) |
| CPU Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| 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 |
| Packaging Form | Tape & Reel (2,000 pcs) | Tray | Tube | Tube | Tape & Reel |
Key Differentiators
- Industrial-grade temperature rating with single-wire BDM debug (vs MC9S08SH4MFK)
- Tape-and-reel packaging for high-volume SMT assembly (vs MC9S08SH32CTG)
- HCS08 core with single-wire BDM reduces tool cost (vs MC9S12XEQ384CAG)
Design Notes
Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD/VSS pin pair on the 28-TSSOP. For noise-sensitive analog applications (e.g., ADC reference), add a 10 uF bulk capacitor on the main VDD rail. The MC9S08SH32CTL574 has three VDD pins (5, 16, 28) and three VSS pins (6, 15, 27) - all must be connected even if some appear unused in the application, per NXP MC9S08SH32 datasheet layout guidance.
Do not leave the BKGD pin floating during normal operation. The single-wire BDM interface requires a defined logic level or it may unintentionally enter debug mode or source excessive current. Per NXP documentation, either tie BKGD to VDD through a pull-up resistor (typically 10 kB) or leave it accessible for programming. Also ensure the RESET pin is pulled high through an external pull-up resistor of 10 kB to 100 kB; the internal pull-up alone may be insufficient in noisy environments.
Route the BKGD trace away from high-frequency switching nodes (PWM outputs, switching power supply nodes) to avoid coupling debug noise. The single-wire BDM operates at high-impedance levels, making it susceptible to EMI. For ADC applications, route analog inputs (PTA0-PTA7 if used as ADC) on a separate analog ground island joined at a single point to the digital ground near the VSS pins, per NXP MC9S08SH32 datasheet analog design notes.
Compliance Information
RoHS and REACH compliance per NXP product declarations. Lead-free TSSOP-28 package. AEC-Q100 not applicable for industrial-grade 'CTL' variant; check 'VLG' suffix variants for automotive-grade options. Halogen-free status not explicitly stated in available data - marked unknown.
