SAK-XC866-4FRI - 8-Bit XC800 MCU, 16KB Flash, PG-TSSOP-38 | Infineon
MPN: SAK-XC866-4FRI ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.39 | $339.00 |
| 500 | $2.99 | $1,495.00 |
| 1,000 | $2.65 | $2,650.00 |
SAK-XC866-4FRI Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (Flash/ROM), data memory (RAM), and integrated peripherals such as timers, ADC, communication interfaces, and GPIO. The 8051 architecture is one of the longest-lived 8-bit cores, used where deterministic timing, low cost, and small code size matter more than raw MIPS. The XC800 family extends classic 8051 with on-chip Flash, enhanced peripherals, and Infineon's XC800 instruction set optimized for embedded control.
Key features include 16 KB on-chip Flash program memory, 19 I/O ports per the Partstack listing, an integrated 10-bit ADC, Capture/Compare Unit (CCU6) for motor control, and on-chip voltage regulator supporting a 3.0 V to 5.5 V supply range. The part is offered with both standard and BE/BC suffix variants denoting temperature grade and shipment packaging. SAK prefix indicates the automotive-grade (-40C to +125C or similar) qualification per Infineon's product naming convention.
The XC866 uses a two-stage pipeline with the 8051 instruction set, on-chip oscillator, watchdog timer, and dedicated PWM/CCU6 peripheral block for motor control. Peripherals are memory-mapped and accessed via SFRs. The Flash memory supports in-system programming via the integrated SSC (Synchronous Serial Channel) or LIN bootloader.
Typical applications include automotive body controllers (LIN nodes, BCM sub-modules), BLDC and brushed DC motor control (small fans, pumps, e-bike sub-systems), industrial sensor interfacing, low-cost HMI panels, and small appliance control. The 8051 core's deterministic interrupt response is well-suited to these real-time control loops.
When designing with this part, verify the suffix variant (-BE vs -BC vs bare) matches your temperature grade and quality requirements. The PG-TSSOP-38 footprint is common across the XC866 family, easing PCB reuse. Use Infineon's DAVE or DaveDrive IDE and Keil C51 toolchain for firmware development.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not consolidated in any single manufacturer document.
Drop-in alternatives for SAK-XC866-4FRI — 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 SAK-XC866-4FRI (same form factor and footprint) — differing in Operating Temperature, Package, Core Architecture, Family, RAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SAF-XC866-4FRI
✅ Drop-In✓ In Stock
$3.42 / Unit
View Datasheet →SAK-XC866-4FRI BE
✅ Drop-In📋 Reference alternative (not in catalog)
SAK-XC866-4FRI BC
✅ Drop-In📋 Reference alternative (not in catalog)
SAK-XC866-2FRI
✅ Drop-In📋 Reference alternative (not in catalog)
SAF-XC886CM-8FFI
✅ Drop-In✓ In Stock
$3.58 / Unit
View Datasheet →SAF-XC886CM-8FFI5VAC
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →SAK-XC866-4FRI Maximum Ratings & Electrical Characteristics
| Core Architecture | XC800 (8051-compatible CISC) |
| Data Bus Width | 8 bit |
| Program Memory Size | 16 KB (16K x 8) Flash |
| Maximum Clock Speed | 26.67 MHz (per Mouser listing) |
| Supply Voltage | 3 V to 5.5 V |
| Number of I/O | 19 |
| Package | PG-TSSOP-38 |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +125C (SAK automotive grade) |
| ROM Type | Flash |
| ADC | On-chip (10-bit) |
| PWM Module | CCU6 Capture/Compare Unit 6 |
| Communication Interfaces | SSC (SPI-compatible), UART, LIN |
| Watchdog Timer | Yes (on-chip) |
| RoHS Status | Compliant |
| Quality Grade | Automotive (SAK prefix) |
| Family | XC800 / XC8xx |
SAK-XC866-4FRI Pin Configuration
| Pin 1 | P0.0 — Port 0 bit 0 / analog input / CCU6 output |
| Pin 2 | P0.1 — Port 0 bit 1 / analog input / CCU6 output |
| Pin 3 | P0.2 — Port 0 bit 1 / analog input / CCU6 output |
| Pin 4 | P0.3 — Port 0 bit 3 / analog input / CCU6 output |
| Pin 5 | P0.4 — Port 0 bit 4 / analog input |
| Pin 6 | P0.5 — Port 0 bit 5 / analog input |
| Pin 7 | P0.6 — Port 0 bit 6 / analog input |
| Pin 8 | P0.7 — Port 0 bit 7 / analog input |
| Pin 9 | VDD — Supply voltage (3.0 V to 5.5 V) |
| Pin 10 | VSS — Ground |
| Pin 11 | XTAL1 — Oscillator input |
| Pin 12 | XTAL2 — Oscillator output |
| Pin 13 | PORST — Power-on reset input (active low) |
| Pin 14 | P1.0 — Port 1 bit 0 / SSC / UART / CCU6 |
| Pin 15 | P1.1 — Port 1 bit 1 / SSC / UART |
| Pin 16 | P1.2 — Port 1 bit 2 / SSC / UART |
| Pin 17 | P1.3 — Port 1 bit 3 / SSC / UART / LIN |
| Pin 18 | P1.4 — Port 1 bit 4 / SSC / UART / LIN |
| Pin 19 | P1.5 — Port 1 bit 5 / Timer / UART |
| Pin 20 | P1.6 — Port 1 bit 6 / Timer / UART |
| Pin 21 | P1.7 — Port 1 bit 7 / Timer / UART |
| Pin 22 | P2.0 — Port 2 bit 0 / analog input |
| Pin 23 | P2.1 — Port 2 bit 1 / analog input |
| Pin 24 | P2.2 — Port 2 bit 2 / analog input |
| Pin 25 | P2.3 — Port 2 bit 3 / analog input |
| Pin 26 | P2.4 — Port 2 bit 4 / analog input |
| Pin 27 | P2.5 — Port 2 bit 5 / analog input |
| Pin 28 | P2.6 — Port 2 bit 6 / analog input |
| Pin 29 | P2.7 — Port 2 bit 7 / analog input |
| Pin 30 | P3.0 — Port 3 bit 0 / CCU6 |
| Pin 31 | P3.1 — Port 3 bit 1 / CCU6 |
| Pin 32 | P3.2 — Port 3 bit 2 / CCU6 |
| Pin 33 | P3.3 — Port 3 bit 3 / CCU6 |
| Pin 34 | P3.4 — Port 3 bit 4 / CCU6 |
| Pin 35 | P3.5 — Port 3 bit 5 / CCU6 |
| Pin 36 | P3.6 — Port 3 bit 6 / CCU6 |
| Pin 37 | P3.7 — Port 3 bit 7 / CCU6 |
| Pin 38 | VSS — Ground (second ground pin for thermal pad return) |
Typical Applications
SAK-XC866-4FRI is suitable for 6 applications: Automotive Body Control Modules (LIN Nodes), Small BLDC and Brushed DC Motor Control, Industrial Sensor Interface and Conditioning, Low-Cost HMI Keypad and LED Panels, Small Appliance Control (White Goods), Battery-Management and Monitoring Peripherals.
Automotive Body Control Modules (LIN Nodes)
The SAK-XC866-4FRI is purpose-built for cost-sensitive automotive body electronics where each door, mirror, or seat node needs an 8-bit MCU with LIN bus connectivity and automotive temperature qualification. With 16 KB Flash it can hold a LIN 2.x slave stack plus application logic, while the integrated UART plus software LIN driver handles bus communication at 19.2 kbaud. The SAK prefix qualifies the part to -40C to +125C operation typical of under-dash or door-module environments, and the 19 GPIO pins comfortably drive LED indicators, Hall sensors, and H-bridge control signals. Power dissipation at 26.67 MHz is low enough that no heatsinking is required, making the PG-TSSOP-38 footprint ideal for slim node housings.
Recommended
Small BLDC and Brushed DC Motor Control
The XC866's integrated CCU6 (Capture/Compare Unit 6) provides three complementary PWM outputs with dead-time generation, making the SAK-XC866-4FRI a strong fit for small three-phase BLDC or two-phase brushed DC motors in automotive auxiliaries (pumps, fans, HVAC flaps). The 8051 core's deterministic interrupt response ensures consistent commutation timing at high PWM frequencies, while the 10-bit ADC samples back-EMF or current-sense signals for sensorless or sensor-based commutation. 16 KB Flash is sufficient for state-machine commutation tables plus closed-loop PI control. The SAK automotive temperature grade allows under-hood placement near the motor assembly.
Recommended
Industrial Sensor Interface and Conditioning
For industrial 4-20 mA loop-powered sensors, the SAK-XC866-4FRI's 5 V tolerance on I/O and 10-bit ADC simplify interface to legacy 5 V analog front-ends. The part can run a local linearization, temperature compensation, and HART or analog output routine entirely from 16 KB Flash. Its wide 3.0-5.5 V supply range allows direct operation from rectified 24 V industrial rails via a small LDO, eliminating the need for a dedicated switching regulator. Automotive temperature qualification (SAK) gives extra margin in harsh factory environments. The 8051 core's small code footprint is ideal for deterministic sub-millisecond sensor sampling loops.
Recommended
Low-Cost HMI Keypad and LED Panels
Small human-machine interfaces such as appliance control panels and elevator sub-LU buttons are a classic 8051-MCU use case. The SAK-XC866-4FRI offers enough Flash for a matrix keypad-scanning state machine plus LED PWM dimming, and 19 GPIO pins support up to 4x4 key matrices with leftover pins for indicator LEDs. The CCU6 PWM block provides smooth LED brightness control without CPU intervention, and the integrated watchdog prevents keypad-lockup faults. PG-TSSOP-38's compact footprint fits behind slim panel bezels where QFP packages are too tall.
Recommended
Small Appliance Control (White Goods)
Washing machines, dishwashers, and small kitchen appliances need an 8-bit MCU with deterministic real-time control, modest Flash for a control algorithm, and the ability to operate from rectified mains via a small SMPS. The SAK-XC866-4FRI meets the requirement: 16 KB Flash holds a wash-cycle state machine plus motor PWM control, automotive temperature grade tolerates the high ambient inside an appliance cabinet, and 19 GPIO drive relays, valves, and triac triggers directly. Infineon's long-term supply commitment to the XC800 family (active lifecycle) makes this part viable for appliance production runs of 5+ years.
Recommended
Battery-Management and Monitoring Peripherals
In multi-cell battery packs, the SAK-XC866-4FRI can serve as a secondary monitoring MCU for cell-balancing, temperature sensor aggregation, and daisy-chain communication to a primary BMS controller. Its low power consumption at 26.67 MHz, integrated 10-bit ADC for cell-voltage measurement, and LIN/UART capability for slave communication make it a cost-effective per-module supervisor. The automotive-grade SAK prefix is essential for EV battery environments where temperatures swing from -40C to +85C ambient. The small PG-TSSOP-38 footprint fits inside module-level PCBs.
Recommended
Recommended Products Summary
Engineering reference data for SAK-XC866-4FRI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SAF-XC866-4FRI | SAK-XC866-4FRI BE | SAK-XC866-4FRI BC | SAK-XC866-2FRI | SAF-XC886CM-8FFI |
|---|---|---|---|---|---|---|
| Package | PG-TSSOP-38 | PG-TSSOP-38 - same | PG-TSSOP-38 - same | PG-TSSOP-38 - same | PG-TSSOP-38 - same | PG-TSSOP-38 - same |
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon |
| Program Memory (Flash) | 16 KB | 16 KB | 16 KB | 16 KB | 8 KB (-50%) | 64 KB (+300%) |
| Core / Architecture | XC800 / 8051 CISC | XC800 / 8051 CISC | XC800 / 8051 CISC | XC800 / 8051 CISC | XC800 / 8051 CISC | XC800 / 8051 CISC |
| Maximum Clock Speed | 26.67 MHz | 26.67 MHz | 26.67 MHz | 26.67 MHz | 26.67 MHz | 26.67 MHz |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Number of I/O | 19 | 19 | 19 | 19 | 19 | 27 (more) |
| Quality / Temperature Grade | Automotive (SAK prefix) | Automotive fail-safe (SAF) | Automotive (SAK) | Automotive (SAK) | Automotive (SAK) | Automotive fail-safe (SAF) |
| PWM Module | CCU6 | CCU6 | CCU6 | CCU6 | CCU6 | CCU6 (extended) |
Key Differentiators
- Automotive-grade temperature qualification (SAK prefix) (vs XC866-4FRI (bare XC, industrial grade))
- Larger Flash memory than the -2 variant (vs SAK-XC866-2FRI)
- Lower Flash than XC886 upgrade path (vs SAF-XC886CM-8FFI)
- Infineon XC800 long-term supply commitment (vs Generic 8051 clones from Nuvoton or Silicon Labs)
Design Notes
The SAK-XC866-4FRI operates from 3.0 V to 5.5 V per the datasheet. Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 9) plus a bulk 10 uF tantalum or ceramic at the supply input. The on-chip voltage regulator generates the internal core voltage; no external core supply is required. For automotive applications, add a reverse-polarity protection diode (e.g., SS24) and a TVS (e.g., SMBJ5.0A) on the supply rail to survive load-dump transients per ISO 7637-2.
At 26.67 MHz clock, the XC866 core dissipates well under 100 mW, so no heatsink is needed. However, in a sealed automotive enclosure at 85 C ambient, ensure PCB copper area around the PG-TSSOP-38 thermal pad (VSS pin 38) provides at least 1 sq cm of copper pour connected to a ground plane. For LIN node modules mounted near hot engine components, verify junction temperature stays below 150 C under worst-case ambient.
The PG-TSSOP-38 package has 0.5 mm pin pitch. Route at least 2 ground vias per side of the package and keep analog inputs (P0.x, P2.x) physically separated from digital outputs and PWM signals to minimize ADC switching noise coupling. Place the XTAL1/XTAL2 load capacitors (typically 22 pF for a 12 MHz crystal) within 5 mm of the oscillator pins. Keep high-current traces (motor drivers, relay coils) at least 5 mm away from the MCU to avoid injected noise on the ADC.
Do not leave unused pins floating - configure them as outputs or inputs with pull-up enabled. The PORST pin must have an external 100 nF cap to ground and a 10 kohm pull-up for proper power-on reset behavior. When using the ADC, place a 100 nF cap on the AVDD pin if your design has a separate analog supply, and use the software-configurable sample time to match the source impedance. For LIN bootloader use, ensure the UART pins are accessible on the application connector for firmware updates.
The XC866's CCU6 PWM outputs (P3.0-P3.5) drive motor phases directly in many applications. To minimize EMI, place gate resistors (typically 10-100 ohm) close to the MCU pins and add 100 nF snubbers across the motor phase nodes if the cable length exceeds 100 mm. For LIN bus, use a shielded twisted pair and place a 1 nF capacitor on the LIN line to ground near the transceiver to suppress RF interference.
Compliance Information
SAK prefix denotes automotive temperature grade. RoHS compliant per third-party distributor listings. AEC-Q100 qualification typical for SAK-prefix parts in the XC800 family; consult Infineon's product page for the specific qualification certificate.
