PIC16C558T-20I/SO - 8-Bit 20MHz 3.5KB OTP MCU | Microchip
料号： PIC16C558T-20I/SO ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.48 | $148.00 |
| 500 | $1.33 | $665.00 |
| 1,000 | $1.18 | $1,180.00 |
PIC16C558T-20I/SO 概述
A microcontroller (MCU) is a single-chip computer containing a CPU, memory, and programmable I/O peripherals. The PIC16C5x family uses a Harvard-architecture RISC core with 33 single-word instructions, delivering deterministic throughput for embedded control. Within the broader hierarchy, the PIC16C558 sits between the smaller PIC12/14 families (typically 6-14 pins) and the larger PIC16F and PIC18 families; it is designed for cost-sensitive 18-pin applications that need more code space than PIC16C54/55/56 but fewer peripherals than modern PIC16F1xxx devices.
Key features of the PIC16C558T-20I/SO include 13 digital I/O pins, a Power-On Reset (POR), Watchdog Timer (WDT), and a Timer0 8-bit counter/timer. The '20' speed suffix indicates the 20MHz maximum oscillator frequency, while the 'T' indicates tape-and-reel packaging, 'I' specifies the industrial -40C to +85C operating temperature range, and '/SO' denotes the 18-pin SOIC outline. The OTP memory is programmed once via standard Microchip device programmers, making the part ideal for high-volume, low-cost field-deployed products where firmware is stable and flash reprogrammability is not required.
Typical applications include appliance controllers, sensor signal conditioning front-ends, simple motor control drivers, automotive body electronics, lighting controllers, low-end remote keyless entry transmitters, security alarm panels, and battery-powered instrumentation. Because OTP memory cannot be erased and rewritten, designers typically prototype with the PIC16F558 (Flash) equivalent and migrate to the PIC16C558 once firmware is finalized.
A key design consideration is migration from the Flash PIC16F558: the two parts share pinout and core peripherals, allowing a single PCB to support both. Use a 4.7kohm pull-up on MCLR/VPP and 100nF decoupling on VDD, with a 22pF or 33pF load capacitor pair on OSC1/OSC2 for a crystal oscillator reference design.
直接替换替代料： PIC16C558T-20I/SO ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC16C558T-20I/SO （相同外形与封装尺寸） ——差异在于 Program Memory Size, Core Architecture, Package, Program Memory Type, Operating Temperature Range.
快速对比工具——选择替代料号进行并排对比：
PIC16C558-20I/SO
✅ 直接替换✓ 有现货
$1.2 / 个
查看数据手册 →PIC16F558-I/SO
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
PIC16C558T-20E/SO
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
PIC16C554T-20I/SO
✅ 直接替换✓ 有现货
$1.82 / 个
查看数据手册 →PIC16C558T-20I/SO 最大额定值与电气特性
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Family | PIC16C5x |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM Size | 128 x 8 bytes |
| 最大时钟频率 | 20 MHz |
| Instruction Cycle Time | 200 ns |
| Instruction Set Size | 33 single-word instructions |
| I/O Pins | 13 |
| Timers | 1 x 8-bit (Timer0) |
| Watchdog Timer | Yes |
| Power-On Reset | Yes |
| 电源电压 | 3.0 V to 5.5 V |
| 工作温度 | -40 C to +85 C (Industrial) |
| 封装 | 18-pin SOIC (SO, 0.300") |
| 安装类型 | Surface Mount |
| Lead-Free / RoHS | Lead-Free finish available (check variant suffix) |
PIC16C558T-20I/SO 引脚配置
| 引脚 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| 引脚 2 | RA0 — Port A bit 0 (digital I/O) |
| 引脚 3 | RA1 — Port A bit 1 (digital I/O) |
| 引脚 4 | RA2 — Port A bit 2 (digital I/O) |
| 引脚 5 | RA3 — Port A bit 3 (digital I/O) |
| 引脚 6 | RB0/INT — Port B bit 0 / External interrupt |
| 引脚 7 | RB1 — Port B bit 1 |
| 引脚 8 | RB2 — Port B bit 2 |
| 引脚 9 | RB3 — Port B bit 3 |
| 引脚 10 | RB4 — Port B bit 4 |
| 引脚 11 | RB5 — Port B bit 5 |
| 引脚 12 | RB6 — Port B bit 6 |
| 引脚 13 | RB7 — Port B bit 7 |
| 引脚 14 | VSS — Ground reference |
| 引脚 15 | OSC2/CLKOUT — Oscillator output / Clock output (Fosc/4) |
| 引脚 16 | OSC1/CLKIN — Oscillator input / External clock input |
| 引脚 17 | VDD — Positive supply (3.0V to 5.5V) |
| 引脚 18 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
典型应用
PIC16C558T-20I/SO 适用于 7 应用s: Appliance Control (White Goods), Sensor Signal Conditioning Front-End, Low-End Automotive Body Electronics, Remote Keyless Entry (RKE) Transmitter, Lighting Controllers and LED Chasers, Security Alarm Panels and Access Control, Battery-Powered Instrumentation.
Appliance Control (White Goods)
The PIC16C558T-20I/SO fits appliance controllers because it offers 13 digital I/O pins sufficient to drive relays, switches, and indicator LEDs in washing machines, microwave ovens, and dishwashers. Its 3.5KB OTP memory and 200ns instruction cycle handle state-machine control loops and timing functions for cycle sequencing. The industrial -40C to +85C temperature range withstands the thermal stress of enclosed motor compartments. Designers select this part for high-volume programs where firmware is finalized and the low unit cost of OTP outweighs the loss of in-field reprogrammability. Typical interfaces: 7-segment LED drivers via PORTB, push-button inputs on PORTA.
推荐
Sensor Signal Conditioning Front-End
The PIC16C558T-20I/SO is well suited to sensor signal conditioning where a microcontroller scans multiple digital sensors and drives a display or communication interface. The 13 I/O lines accommodate 4-bit PORT A and 8-bit PORT B, allowing connection to several switch or threshold sensors simultaneously. The 20MHz core supports polling at high rates, and Timer0 enables precise interval timing for sensor sampling. Its OTP memory keeps unit cost low when firmware is locked, while the Watchdog Timer and Power-On Reset improve field reliability in remote installations.
推荐
Low-End Automotive Body Electronics
The PIC16C558T-20I/SO is appropriate for automotive body controllers - simple functions like seat-position memory, mirror-fold logic, or interior lighting sequencers where 3.5KB of code is sufficient. The device operates from 3.0V-5.5V with low quiescent current, ideal for ignition-off battery-drain minimization. For under-hood or extreme-temperature applications, designers step up to the PIC16C558T-20E/SO (-40C to +125C). The 18-SOIC footprint is compatible with hand-soldered prototypes and high-volume pick-and-place assembly.
推荐
Remote Keyless Entry (RKE) Transmitter
The PIC16C558T-20I/SO fits low-cost RKE keyfob transmitters that transmit encrypted rolling codes via SAW or PLL-based RF. The 3.5KB OTP holds the encryption routine and the button-debounce logic, while Timer0 generates the bit-timing for the RF protocol (typically 100us-1ms per bit). The industrial temperature range is adequate for keyfob environments (-40C to +85C). Battery life is maximized by the MCU's sleep-mode behavior between button presses. OTP memory prevents firmware extraction from a stolen device, adding a security layer.
推荐
Lighting Controllers and LED Chasers
The PIC16C558T-20I/SO drives LED chasers, decorative lighting sequencers, and architectural light controllers where many GPIO pins are needed to multiplex LEDs. PORTB (8 pins) handles a direct LED bank while PORTA handles control inputs from buttons or rotary encoders. At 20MHz, the MCU easily generates PWM-style chase patterns in software without dedicated peripherals. OTP memory suits high-volume decorative products where firmware changes are infrequent. The low BOM cost supports consumer price points.
推荐
Security Alarm Panels and Access Control
The PIC16C558T-20I/SO is well suited to security alarm panels for small commercial or residential installations where it monitors up to 8 zones via PORTB and reports status via relays or serial interface from PORTA. The Watchdog Timer ensures panel recovery from software lockups, and Power-On Reset guarantees clean startup after power failures. OTP memory prevents code extraction by tampering. Industrial temperature range accommodates unheated enclosures. For panel designs requiring keypad scanning, an I2C-expander MCP23008 can extend I/O without losing the cost advantage.
推荐
Battery-Powered Instrumentation
The PIC16C558T-20I/SO fits battery-powered instruments like handheld multimeters, environmental loggers, or portable test tools where low active current and minimal sleep-mode current are essential. The 3.0V minimum supply voltage enables direct operation from 2x AA alkaline cells or a single Li-ion cell with simple regulation. The 20MHz clock can be throttled or halted to extend battery life. With Watchdog Timer-based wakeup, the MCU sleeps for seconds between measurements. The 128B RAM buffers recent readings before the device writes to an external EEPROM.
推荐
推荐产品汇总
工程参考数据： PIC16C558T-20I/SO ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC16C558-20I/SO | PIC16F558-I/SO | PIC16C558T-20E/SO | PIC16C554T-20I/SO |
|---|---|---|---|---|---|
| Package | 18-SOIC (SO) | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB Flash | 3.5 KB OTP | 0.875 KB OTP (-75%) |
| RAM | 128 B | 128 B | 128 B | 128 B | 80 B (-37%) |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Memory Type | OTP (one-time) | OTP | Flash (10k erase cycles) | OTP | OTP |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +125C (Extended) | -40C to +85C |
| I/O Pins | 13 | 13 | 13 | 13 | 13 |
| Packaging | Tape & Reel | Tube | Tube | Tape & Reel | Tape & Reel |
关键差异点
- Larger program memory than PIC16C554 at same price tier （对比 PIC16C554T-20I/SO)
- OTP memory provides cost advantage over Flash in high volume （对比 PIC16F558-I/SO)
- Industrial temperature range vs extended variants available （对比 PIC16C558T-20E/SO)
设计说明
The PIC16C558T-20I/SO requires a clean VDD supply: place a 100nF ceramic decoupling capacitor within 5mm of the VDD pin (pin 17) with a direct ground connection to pin 14. Add a bulk 10uF tantalum or aluminum electrolytic capacitor on the same rail if the supply is shared with motors or relays. For battery-powered designs, add a 10kohm pull-down on MCLR/VPP (pin 1) to ensure defined reset state during power-up; an external 4.7kohm pull-up to VDD is also acceptable per datasheet Figure 7-1.
OTP memory can be programmed only once. A programming error or late-stage code change requires discarding the silicon. To mitigate, prototype with the Flash-based PIC16F558-I/SO (same 18-SOIC pinout, same peripherals) and migrate to the PIC16C558 OTP version only after firmware is fully validated. For volume production, always order OTP parts with a 5-10% overage to cover programming losses and avoid reorders that may collide with NRND supply constraints.
Route the crystal traces (OSC1 pin 16 and OSC2 pin 15) as short and symmetric as possible, with the crystal placed within 10mm of the MCU. Surround the crystal with a ground guard ring to reduce EMI radiation. When using an external clock source instead of a crystal, drive OSC1 only and leave OSC2 floating. For RC oscillator mode (lowest cost), connect a resistor from OSC1 to VDD and a capacitor from OSC1 to VSS; expect wider frequency tolerance (typically +/- 5-10%) than crystal mode.
合规信息
Lead-free finish available with standard Microchip ordering suffix. RoHS compliance per Microchip product page. AEC-Q100 not applicable for the I-suffix industrial grade; use Q-suffix variants for automotive qualification.
