PIC18LC252-I/SO - 8-Bit 40MHz 32KB OTP MCU | Microchip
MPN: PIC18LC252-I/SO ✗ انتهى عمره الإنتاجيPIC18LC252-I/SO نظرة عامة
An 8-bit microcontroller (MCU) is a programmable logic device built around an 8-bit data path that executes simple instructions at low-to-moderate clock speeds, typically used in embedded control applications. Within the semiconductor hierarchy, the PIC18LC252 sits under: microcontroller -> embedded processor -> integrated circuit (IC) -> semiconductor. It uses Harvard architecture (separate program and data buses) and RISC instruction set with only 77 single-word instructions, simplifying firmware development and reducing code size relative to CISC 8-bit alternatives.
Key features include a 10-bit ADC, multiple timers, USART, SPI, and I2C peripherals, plus industrial-grade operating temperature of -40 °C to +85 °C. The "LC" suffix indicates a low-voltage core (2.5 V to 5.5 V operation) suitable for battery-powered designs. Hardware multiplier, 16-bit wide instruction word, and 32 KB program storage make this device suitable for moderately complex control firmware. The 28-SOIC package offers easy hand-soldering and broad compatibility with through-hole-style prototyping on SMD adapter PCBs.
The PIC18LC252-I/SO uses an OTP program memory architecture, meaning firmware is permanently written during manufacturing or in-system programming and cannot be erased. This contrasts with FLASH-based siblings (PIC18F252) which support in-application reprogramming. PIC18 microcontrollers are upwards compatible across the family, allowing code migration to higher pin-count or larger memory variants without architectural changes.
Typical applications include industrial control systems, sensor signal conditioning, motor control interfaces, low-power instrumentation, and legacy embedded product retrofits. The industrial temperature range and OTP memory target cost-sensitive, high-volume, field-deployed products where firmware revision is finalized at production time.
When designing with this device, note that OTP memory cannot be field-upgraded - choose the PIC18F252 flash-based variant if firmware revision is anticipated. The 28-SOIC footprint is shared with PIC18F242/F252, allowing PCB layout reuse between prototype (FLASH) and production (OTP) builds.
This page synthesizes distributor pricing, pin-compatible alternatives across PIC18C/F families, and practical OTP vs FLASH selection guidance not found in the manufacturer datasheet alone.
بدائل مباشرة لـ PIC18LC252-I/SO — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع PIC18LC252-I/SO (نفس عامل الشكل والبصمة) — يختلف في ADC, Package, Core Architecture, RoHS Status, Operating Temperature.
PIC18F252-I/SO
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LC242T-I/SO
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LC242-I/SO
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F242-I/SO
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F252T-I/SO
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18C252-I/SO
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
PIC18LC252-I/SO الحدود القصوى والخصائص الكهربائية
| Manufacturer | Microchip Technology |
| Series | PIC® 18C |
| Core Architecture | 8-bit RISC (Harvard) |
| Core Processor | PIC |
| Instruction Set Width | 16-bit (16K x 16 = 32 KB) |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 1536 bytes |
| أقصى تردد للساعة | 40 MHz |
| Performance | 10 MIPS (100 ns instruction execution) |
| Number of I/O Pins | 23 |
| ADC | 10-bit |
| Supply Voltage Range | 2.5 V to 5.5 V (LC low-voltage core) |
| نطاق درجة حرارة التشغيل | -40 °C to +85 °C (Industrial) |
| العلبة | 28-SOIC (0.295", 7.50 mm body width) |
| نوع التركيب | Surface Mount |
| Number of Instructions | 77 single-word instructions |
| حالة RoHS | See compliance info |
| عدد الأطراف | 28 |
تكوين أطراف PIC18LC252-I/SO
| دبوس 1 | MCLR/VPP/RE3 — Master Clear (reset) input / programming voltage / digital input RE3 |
| دبوس 2 | RA0/AN0 — PORTA bit 0 / analog input channel 0 |
| دبوس 3 | RA1/AN1 — PORTA bit 1 / analog input channel 1 |
| دبوس 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input channel 2 / ADC VREF- |
| دبوس 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input channel 3 / ADC VREF+ |
| دبوس 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| دبوس 7 | RA5/AN4/SS/LVDIN — PORTA bit 5 / analog input / SPI slave select / LVD input |
| دبوس 8 | OSC2/CLKO/RA6 — Crystal output / clock output / PORTA bit 6 |
| دبوس 9 | OSC1/CLKI/RA7 — Crystal input / clock input / PORTA bit 7 |
| دبوس 10 | VSS — Ground reference |
| دبوس 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| دبوس 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| دبوس 13 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| دبوس 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| دبوس 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| دبوس 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| دبوس 17 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| دبوس 18 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| دبوس 19 | VSS — Ground reference |
| دبوس 20 | VDD — Positive supply voltage |
| دبوس 21 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| دبوس 22 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| دبوس 23 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| دبوس 24 | RB3/INT3 — PORTB bit 3 / external interrupt 3 |
| دبوس 25 | RB4 — PORTB bit 4 |
| دبوس 26 | RB5/PGM — PORTB bit 5 / LVP programming input |
| دبوس 27 | RB6/PGC — PORTB bit 6 / ICSP clock |
| دبوس 28 | RB7/PGD — PORTB bit 7 / ICSP data |
التطبيقات النموذجية
PIC18LC252-I/SO مناسب لـ 6 التطبيقs: Industrial Control Systems, Home Appliance Controllers, Automotive Body Electronics, Sensor Signal Conditioning Hubs, Battery-Powered Portable Devices, Legacy Embedded Product Retrofits.
Industrial Control Systems
The PIC18LC252-I/SO fits industrial control systems through its 10 MIPS performance, 32 KB OTP program memory, and 23 I/O pins supporting sensors, relays, and actuators. Its industrial temperature range of -40 °C to +85 °C and 2.5 V - 5.5 V supply tolerate factory floor conditions, while the 10-bit ADC handles analog sensor inputs directly. The OTP memory suits fixed-function industrial controllers where firmware is finalized at production. Per the Microchip datasheet, typical use includes PLC I/O modules, motor starters, and process control loops.
موصى به
Home Appliance Controllers
The PIC18LC252-I/SO serves home appliance controllers via OTP memory for locked firmware, 32 KB code space for washing machine or microwave logic, and 23 I/O pins driving user interfaces, displays, and motor relays. The 2.5 V to 5.5 V supply range matches battery-backed and line-powered designs, while industrial temperature tolerance handles appliance environments. Per Microchip application notes, OTP reduces per-unit cost for high-volume white goods production. The 28-SOIC package is hand-solder-friendly for prototyping service replacement modules.
موصى به
Automotive Body Electronics
The PIC18LC252-I/SO addresses non-safety automotive body electronics through 32 KB OTP memory for locked firmware and industrial -40 °C to +85 °C temperature tolerance suitable for cabin and body modules. The 10-bit ADC and 23 I/O pins interface with switches, sensors, and LED drivers for interior lighting, seat controllers, and accessory multiplex nodes. Note that this part is NOT AEC-Q100 qualified; for AEC-Q100 applications the PIC18F252-I/SO with automotive suffix is required per Microchip product documentation.
موصى به
Sensor Signal Conditioning Hubs
The PIC18LC252-I/SO operates as a sensor signal conditioning hub by digitizing analog sensor inputs through its 10-bit ADC and applying calibration/linearization in firmware across 32 KB of code space. The 40 MHz clock and 10 MIPS throughput enable real-time filtering algorithms for pressure, flow, and temperature sensors. Per Microchip application literature, the LC core's 2.5 V minimum supply suits battery-powered wireless sensor nodes. The 23 I/O pins multiplex to multiple sensor channels and communication peripherals.
موصى به
Battery-Powered Portable Devices
The PIC18LC252-I/SO is well-suited for battery-powered portable devices owing to its LC low-voltage core that operates down to 2.5 V, enabling direct connection to 2x AA alkaline or single Li-ion cells. The OTP memory suits disposable or non-upgradable consumer products, while 32 KB program memory handles display control, button scanning, and low-power timer routines. Per the Microchip datasheet, the LC variant offers reduced core current versus the standard C variant, extending battery life in remote controls, toys, and portable meters.
موصى به
Legacy Embedded Product Retrofits
The PIC18LC252-I/SO supports legacy embedded product retrofits through its PIC18 instruction set compatibility and 28-SOIC footprint shared with the broader PIC18F242/F252 family. Designs originally built on PIC16 or older PIC18 OTP parts can migrate to the LC252 for additional code space (32 KB) and peripheral integration. Per Microchip migration guides, the LC core's 2.5 V - 5.5 V operation allows retrofit into existing power rails without redesign. The pin-compatible FLASH alternatives simplify firmware updates during service events.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC18LC252-I/SO — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | PIC18F252-I/SO | PIC18LC242-I/SO | PIC18LC242T-I/SO | PIC18F242-I/SO | PIC18F252T-I/SO | PIC18C252-I/SO |
|---|---|---|---|---|---|---|---|
| Package | 28-SOIC | 28-SOIC (same) | 28-SOIC (same) | 28-SOIC (same) | 28-SOIC (same) | 28-SOIC (same) | 28-SOIC (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | OTP | FLASH (reprogrammable) | OTP | OTP | FLASH (reprogrammable) | FLASH (reprogrammable) | OTP |
| Program Memory Size | 32 KB (16K x 16) | 32 KB FLASH | 16 KB (-50%) | 16 KB (-50%) | 16 KB (-50%) | 32 KB FLASH | 32 KB OTP |
| Supply Voltage Range | 2.5 V to 5.5 V (LC) | 2.0 V to 5.5 V (F) | 2.5 V to 5.5 V (LC) | 2.5 V to 5.5 V (LC) | 2.0 V to 5.5 V (F) | 2.0 V to 5.5 V (F) | 4.2 V to 5.5 V (C, standard) |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| I/O Pins | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
| Lifecycle Status | Obsolete | Active | Obsolete | Obsolete | Active | Active | Obsolete |
أبرز الفروقات
- Active FLASH replacement available with identical footprint (مقابلPIC18F252-I/SO)
- Same 28-SOIC footprint at half the memory for cost-down (مقابلPIC18LC242-I/SO)
- Lower-voltage 2.5 V minimum supply vs standard C core (مقابلPIC18C252-I/SO)
ملاحظات التصميم
OTP memory cannot be field-upgraded. Once the firmware is written, no further revisions are possible without physically replacing the chip. For prototypes, beta programs, or products with evolving firmware, use the FLASH-based PIC18F252-I/SO instead - it shares the identical 28-SOIC footprint and pinout, allowing PCB layout reuse. Estimated: a typical OTP-to-FLASH BOM swap requires no PCB changes when the same 28-SOIC package is used.
The LC low-voltage core supports 2.5 V - 5.5 V operation, but brown-out and low-voltage detect (LVD) thresholds must be configured per the application. Per the Microchip datasheet, configure BOR/LVD in the configuration words to prevent code corruption during supply voltage dips. Add a 100 nF decoupling capacitor close to VDD (pin 20) and a bulk 10 uF capacitor at the supply rail; Estimated: typical LC252 active current at 40 MHz / 5 V is around 15-20 mA, scaling down at lower clock and voltage.
Place the 28-SOIC decoupling capacitors (100 nF ceramic) within 3 mm of VDD (pin 20) and VSS (pins 10, 19). Route the crystal/oscillator traces (OSC1/OSC2, pins 8-9) symmetrically and short to minimize EMI. Use a ground pour under the device and avoid running high-frequency signals under the SOIC body. For programming header access, dedicate either RB6/RB7 (PGC/PGD) or MCLR (pin 1) for ICSP connectivity per Microchip development guidelines.
معلومات الامتثال
RoHS/REACH/lead-free status not present in the verified web data; set to unknown. AEC-Q100 marked not_applicable as the standard PIC18LC252 is industrial-grade; for automotive applications choose a Q-suffix or AEC-Q100 qualified variant. Conflict-minerals compliance is per Microchip Technology corporate policy.
