MB91F526LKCPMC-GSK5E2 - 32-bit FR81S MCU 1.0625MB Flash | Infineon
MPN: MB91F526LKCPMC-GSK5E2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.4834 | $18.48 |
| 10 | $17.2 | $172.00 |
| 100 | $15.55 | $1,555.00 |
| 500 | $13.9 | $6,950.00 |
| 1,000 | $12.4 | $12,400.00 |
MB91F526LKCPMC-GSK5E2 Overview
A 32-bit MCU is a microprocessor that integrates a CPU, memory and peripherals on a single die. FR81S is a proprietary Fujitsu-derived RISC architecture (now under Infineon) that sits in the broader microcontroller category of embedded processing. Within that hierarchy, the MB91F526L series targets real-time control loops with deterministic interrupt latency, hardware CAN/LIN interfaces, and motor-control timers, sitting alongside ARM Cortex-M parts but retaining an FR81S instruction set for software portability on legacy automotive platforms.
Key features include up to 80 MHz core operation, hardware CAN 2.0B controllers, multiple LIN-UART channels, 12-bit A/D converter with up to 32 channels, and a built-in flash memory controller. The wide 2.7 V–5.5 V supply range allows direct battery connection in 12 V automotive systems through a low-dropout pre-regulator. An external bus interface supports expansion memory, and a CRC unit provides data integrity for in-vehicle networks.
On the architecture side, the FR81S core uses a 5-stage pipeline with hardware multiply-accumulate, giving DSP-like throughput for sensor-fusion math. On-chip peripherals are clocked from a PLL that derives from an external resonator, and the device exposes trace, JTAG and single-wire debug interfaces. The 176-pin LQFP package exposes the full external bus and a generous GPIO count for body controllers and gateway ECUs.
Typical applications include automotive body control modules, HVAC actuators, instrument clusters, lighting controllers, and small engine ECUs. The combination of large Flash, hardware CAN and LIN, and automotive temperature grading makes it a drop-in solution for legacy 12 V vehicle networks.
When designing with this part, allocate the LQFP's thermal pad to a continuous ground copper pour and bypass each supply pin with a 100 nF ceramic capacitor placed within 3 mm of the pin. For CAN bus termination, follow ISO 11898-2 with a 120 ohm resistor and common-mode choke.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single source for engineering decisions.
Drop-in alternatives for MB91F526LKCPMC-GSK5E2 — 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 MB91F526LKCPMC-GSK5E2 (same form factor and footprint) — differing in Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MB91F526LWCPMC-GSK5E2
✅ Drop-In📋 Reference alternative (not in catalog)
MB91F528USDPMC-GSE2
✅ Drop-In📋 Reference alternative (not in catalog)
MB91F528USCPMC-GSE2
✅ Drop-In📋 Reference alternative (not in catalog)
MB91F467PAPMC-GSK5E2
✅ Drop-In📋 Reference alternative (not in catalog)
MB91F526LKCPMC-GSK5E2 Maximum Ratings & Electrical Characteristics
| Core Architecture | FR81S (32-bit RISC) |
| Flash Memory | 1.0625 MB (1088 KB) |
| RAM | 136 K x 8 |
| Core Count | Single-core |
| Supply Voltage | 2.7 V to 5.5 V |
| Package | 176-pin LQFP |
| Mounting Type | Surface Mount |
| CAN Controllers | Hardware CAN 2.0B (per family datasheet) |
| LIN/UART | Multiple LIN-UART channels (per family datasheet) |
| External Bus Interface | Yes (per family datasheet) |
| Debug Interface | JTAG / single-wire (per family datasheet) |
| RoHS | ROHS3 Compliant |
| Manufacturer Origin | Cypress Semiconductor (now Infineon) |
| Series | MB91F526L |
MB91F526LKCPMC-GSK5E2 176-pin lqfp Pin Configuration Guide
Pin configuration for MB91F526LKCPMC-GSK5E2 (176-pin lqfp package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for MB91F526LKCPMC-GSK5E2.
Refer to the datasheet for full pin configuration.
Typical Applications
MB91F526LKCPMC-GSK5E2 is suitable for 6 applications: Automotive Body Control Module, HVAC Climate Control ECU, Instrument Cluster Controller, Automotive Lighting Controller, Automotive Gateway ECU, Small Engine / Motorcycle ECU.
Automotive Body Control Module
The MB91F526LKCPMC-GSK5E2 is engineered for 12 V automotive body control modules where its 32-bit FR81S core, 1.0625 MB Flash, and hardware CAN 2.0B controllers deliver the deterministic real-time response required for door, window and lighting coordination. According to the family datasheet, the on-chip CAN/LIN-UART channels and 176-pin LQFP GPIO count let a single MCU aggregate multiple body loads without an external bus expander. Place the device on a four-layer PCB with a continuous ground pour under the exposed pad and 100 nF ceramic bypass on every supply pin to suppress the switching noise of body-domain drivers.
Recommended
HVAC Climate Control ECU
The MB91F526LKCPMC-GSK5E2 suits HVAC climate-control ECUs that need deterministic PWM generation for blower and actuator control plus LIN/CAN communication with the vehicle gateway. Its 2.7 V-5.5 V supply range enables direct 5 V rail operation, while the large Flash reserves room for adaptive climate control algorithms and sensor-fusion logic. According to the family datasheet, the timer/counter bank supports complementary PWM with programmable dead-time for three-phase brushless blower motors common in modern HVAC systems.
Recommended
Instrument Cluster Controller
The MB91F526LKCPMC-GSK5E2 drives automotive instrument clusters that need to render CAN-derived vehicle data on segmented or stepper-motor gauges in real time. Its 32-bit throughput handles gauge smoothing and warning-logic algorithms, while the 176-pin LQFP exposes enough GPIO to drive stepper-motor drivers and warning lamps without multiplexing. According to the family datasheet, the on-chip 12-bit ADC reads fuel-level and temperature sensors directly, eliminating an external analog front end.
Recommended
Automotive Lighting Controller
The MB91F526LKCPMC-GSK5E2 is well-matched to LED headlamp and tail-light controllers where PWM-driven current control and CAN/LIN network integration are required. Its 32-bit core runs LED thermal-folding algorithms and matrix-beam logic in software, while the hardware timers deliver the high-resolution PWM channels needed for flicker-free dimming. According to the family datasheet, the wide 2.7 V-5.5 V supply tolerates cranking transients on the 12 V automotive bus when paired with an upstream TVS and pre-regulator.
Recommended
Automotive Gateway ECU
The MB91F526LKCPMC-GSK5E2 serves as a CAN-to-LIN gateway ECU, routing messages between vehicle network segments while running diagnostic and network-management stacks. Its 1.0625 MB Flash holds full AUTOSAR or OSEK/OSEK OS implementations alongside the gateway routing tables. According to the family datasheet, multiple hardware CAN controllers and LIN-UART channels let the MCU terminate several buses in parallel without external protocol bridges.
Recommended
Small Engine / Motorcycle ECU
The MB91F526LKCPMC-GSK5E2 fits small engine and motorcycle ECUs where 32-bit processing power is needed for fuel-injection and ignition timing but board space is constrained. Its 176-pin LQFP exposes the ADC channels and timer outputs required for crank-position sensing and sequential fuel injection. According to the family datasheet, the integrated Flash holds calibration maps and diagnostic routines, simplifying aftermarket tuning workflows.
Recommended
Recommended Products Summary
Engineering reference data for MB91F526LKCPMC-GSK5E2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MB91F526LWCPMC-GSK5E2 | MB91F528USDPMC-GSE2 | MB91F528USCPMC-GSE2 | MB91F467PAPMC-GSK5E2 |
|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon |
| Package | 176-LQFP | 176-LQFP | 176-LQFP | 176-LQFP | 176-LQFP |
| Core | FR81S 32-bit | FR81S 32-bit | FR81S 32-bit | FR81S 32-bit | FR81S 32-bit |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V (family) | 2.7 V to 5.5 V (family) | 2.7 V to 5.5 V (family) | 2.7 V to 5.5 V (family) |
| CAN 2.0B | Yes (per family) | Yes (family) | Yes (family) | Yes (family) | Yes (family) |
| LIN-UART | Yes (per family) | Yes (family) | Yes (family) | Yes (family) | Yes (family) |
| RoHS | ROHS3 Compliant | ROHS3 Compliant (family) | ROHS3 Compliant (family) | ROHS3 Compliant (family) | ROHS3 Compliant (family) |
Key Differentiators
- 1.0625 MB Flash in MB91F526L family baseline (vs MB91F467PAPMC-GSK5E2)
- RoHS3 lead-free compliance (vs MB91F528USCPMC-GSE2)
- FR81S core retained for legacy automotive codebases (vs MB91F528USCPMC-GSE2)
Design Notes
Power the MB91F526LKCPMC-GSK5E2 from a low-dropout pre-regulator that delivers 5 V +/- 5 percent with hold-up for cranking transients. Bypass each VCC/VSS pin pair with a 100 nF ceramic capacitor placed within 3 mm of the pin, and add a bulk 10 uF tantalum or ceramic near the MCU power entry. For 12 V battery inputs, place a TVS diode such that clamping voltage is below the MCU absolute-maximum rating before the LDO; this protects the device from load-dump pulses defined by ISO 7637-2.
Use a four-layer PCB with one continuous ground plane under the 176-pin LQFP to minimize switching-current return paths. Keep CAN-H and CAN-L traces as a differential pair with 120 ohm impedance, route LIN/UART away from PWM signals, and place the quartz resonator within 5 mm of the XTAL pins with a guard ring tied to ground. Expose the JTAG pins to a 2x5 1.27 mm header or Tag-Connect footprint for in-circuit debug.
Do not assume byte-wise pin compatibility between MB91F526L and MB91F528 families without checking the pinout table - the 'USD' and 'USC' suffixes in MB91F528 change the alternate-function map even though the package is the same. Always revalidate startup, watchdog, and interrupt vectors after migration. Also verify the Flash programming algorithm matches the silicon revision; older MB91F526L die revisions used different serial-programming commands than current revisions.
Compliance Information
ROHS3 Compliant and lead-free confirmed by Heisener and mcu-supplier.com distributor listings as of 2026-10-09. AEC-Q100 qualification status not explicitly stated in the verified data - check the official Infineon datasheet for automotive qualification grade.
