PIC16C62BT-20/SO - 8-Bit OTP MCU 3.5KB 20MHz SOIC-28 | Microchip
MPN: PIC16C62BT-20/SO ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.88 | $28.80 |
| 100 | $2.55 | $255.00 |
| 500 | $2.2 | $1,100.00 |
| 1,000 | $1.38 | $1,380.00 |
PIC16C62BT-20/SO Overview
What is an OTP microcontroller? An OTP MCU (One-Time-Programmable Microcontroller) is a microcontroller whose program memory is implemented as EPROM (Erasable PROM) that is programmable exactly once in production or in the field via a high-voltage programmer, after which the bit pattern is permanent. OTP MCUs occupy a middle ground between mask-ROM MCUs (cheapest, but require factory commitment) and flash MCUs (re-programmable in-circuit). They are widely used in cost-sensitive high-volume consumer products where the firmware is final, the bill of materials dominates the unit cost, and re-programmability is unnecessary.
Key features of the PIC16C62BT-20/SO include: 35 instructions, a 14-bit instruction word, 8-bit data path, 8-level deep hardware stack, 4 oscillator options (RC, LP, XT, HS), integrated power-on reset, watchdog timer with on-chip RC oscillator, brown-out reset, programmable code protection, and a wide operating voltage range of 2.5 V to 5.5 V (commercial grade). The PIC16C6x core implements a Harvard architecture with separate program and data buses, enabling single-cycle instruction execution except for program branches.
Typical applications include industrial control logic, appliance controllers, automotive body electronics (non-safety subsystems), HVAC controls, security alarm panels, smart card readers, remote-control transmitters, and battery chargers. The 22 I/O pins support direct interfacing to keypads, LED displays, character LCDs, and serial EEPROMs via I2C bit-banging or hardware USART.
When designing with this part, note that OTP memory cannot be re-programmed in-circuit; firmware must be verified in a flash-based equivalent (e.g., PIC16F62x) before committing to the C-variant. The 28-SOIC package requires a 1.27 mm pitch footprint and supports hand-soldering as well as reflow processes.
This page synthesizes distributor pricing, drop-in PIC16C6x family alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC16C62BT-20/SO — 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 PIC16C62BT-20/SO (same form factor and footprint) — differing in Operating Temperature Range, Program Memory Type, Program Memory Size, Communication Interfaces, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C62B-20I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C62B-20E/SO
✅ Drop-In✓ In Stock
$4.25 / Unit
View Datasheet →PIC16C62B-20/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.65 / Unit
View Datasheet →PIC16C62BT-20I/SO
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →PIC16C62BT-20E/SO
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →PIC16C62BT-20/SO Maximum Ratings & Electrical Characteristics
| Product Family | PIC16C6x |
| Core Architecture | 8-bit RISC Harvard |
| Program Memory Type | OTP (One-Time Programmable EPROM) |
| Program Memory Size | 3.5 KB (2K x 14 words) |
| RAM | 128 bytes |
| EEPROM Data Memory | None |
| Maximum CPU Frequency | 20 MHz |
| Instruction Set | 35 instructions, 14-bit word |
| I/O Pins | 22 |
| Operating Voltage Range | 2.5 V to 5.5 V |
| Operating Temperature Range | 0 C to +70 C (Commercial) |
| Package | 28-SOIC (7.50 mm body width) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| AEC-Q100 Automotive | Not qualified |
PIC16C62BT-20/SO Pin Configuration
| Pin 1 | MCLR/Vpp — Master Clear (active-low reset) / programming voltage input |
| Pin 2 | RA0/AN0 — Port A bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — Port A bit 1 / analog input 1 |
| Pin 4 | RA2/AN2 — Port A bit 2 / analog input 2 |
| Pin 5 | RA3/AN3/VREF — Port A bit 3 / analog input 3 / voltage reference |
| Pin 6 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Pin 7 | RA5/SS/AN4 — Port A bit 5 / slave select / analog input 4 |
| Pin 8 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 9 | OSC2/CLKOUT — Oscillator output / clock out |
| Pin 10 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 11 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 |
| Pin 12 | RC2/CCP1 — Port C bit 2 / CCP1 PWM output |
| Pin 13 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Pin 15 | RC5/SDO — Port C bit 5 / SPI data out |
| Pin 16 | RC6/TX/CK — Port C bit 6 / USART TX / USART clock |
| Pin 17 | RC7/RX/DT — Port C bit 7 / USART RX / USART data |
| Pin 18 | VSS — Ground reference |
| Pin 19 | VDD — Positive supply (2.5 V to 5.5 V) |
| Pin 20 | RB0/INT — Port B bit 0 / external interrupt |
| Pin 21 | RB1 — Port B bit 1 |
| Pin 22 | RB2 — Port B bit 2 |
| Pin 23 | RB3/PGM — Port B bit 3 / low-voltage programming |
| Pin 24 | RB4 — Port B bit 4 |
| Pin 25 | RB5 — Port B bit 5 |
| Pin 26 | RB6/PGC — Port B bit 6 / ICSP clock |
| Pin 27 | RB7/PGD — Port B bit 7 / ICSP data |
| Pin 28 | VSS — Ground reference (second VSS pin for noise immunity) |
Typical Applications
PIC16C62BT-20/SO is suitable for 7 applications: Industrial Control Logic, Appliance Controllers (Washing Machine / Dishwasher / Microwave), Security Alarm Panels, Remote Control Transmitters (Garage Door / RF Key Fob), HVAC Thermostats and Zone Controllers, Battery Chargers and Power Tools, Smart Card and Access Control Readers.
Industrial Control Logic
The PIC16C62BT-20/SO fits industrial control logic because its 20 MHz CPU clock and 35-instruction Harvard core deliver 5 MIPS of deterministic throughput for relay sequencing, sensor polling, and PWM motor control. The 22 I/O pins directly drive optocouplers, 24 V level-shifters, and triac interfaces for solenoid valves, while the integrated watchdog timer and brown-out reset provide the fail-safe behavior required in unattended equipment. The 28-SOIC footprint reflow-solders onto standard 1.27 mm-pitch control boards.
Recommended
Appliance Controllers (Washing Machine / Dishwasher / Microwave)
The PIC16C62BT-20/SO is well-suited for major appliance controllers where its 3.5 KB OTP program memory holds the fixed state machine for motor, pump, and heater sequencing, and its 2.5 V to 5.5 V supply tolerance accommodates rectified 5 V rails common in white goods. The 22 I/O lines drive keypad matrices, 7-segment or character LCD displays, and rotary encoder inputs. OTP memory is preferred in this market because production firmware rarely changes after qualification, and the cost advantage of EPROM over flash materially impacts BOM at million-unit volumes.
Recommended
Security Alarm Panels
The PIC16C62BT-20/SO works in security alarm panels because its hardware USART (TX/RX on RC6/RC7) communicates with GSM modems and central-station dialers, while its 8-bit Timer1 module captures precise interval timing for entry/exit delay logic. The integrated watchdog timer detects firmware lockup conditions that could otherwise disable the alarm, and the brown-out reset prevents false triggering during AC mains brown-outs. The OTP memory prevents end-user code modification, satisfying tamper-resistance requirements common in alarm-system certifications.
Recommended
Remote Control Transmitters (Garage Door / RF Key Fob)
The PIC16C62BT-20/SO is appropriate for RF remote-control transmitters because its low-power CMOS design, 22 I/O capacity for multi-button keypads, and integrated Timer0 capture module enable precise rolling-code or fixed-code transmission protocols (KeeLoq, etc.). The 20 MHz instruction rate produces tight timing for Manchester or PWM modulation of 315/433/868 MHz SAW-transmitter outputs. The OTP cell secures the encryption key against bit-stream probing attacks, a security property valued in access-control applications.
Recommended
HVAC Thermostats and Zone Controllers
The PIC16C62BT-20/SO fits HVAC thermostats because its 22 I/O lines handle thermistor bridges, setpoint rotary encoders, 7-day programming keypads, relay drivers for fan/heat/cool stages, and serial EEPROMs storing schedule data. The internal 8 MHz RC oscillator option (LP/XT/HS selectable) lets the designer trade accuracy for current consumption, important in battery-backed thermostats. The wide 2.5 V to 5.5 V range supports both 3.3 V lithium and 5 V mains-derived rails common in HVAC electronics.
Recommended
Battery Chargers and Power Tools
The PIC16C62BT-20/SO suits smart battery chargers and cordless power-tool controllers because its CCP (Capture/Compare/PWM) module generates the high-resolution PWM signals required for current-mode battery charging profiles (CC-CV for Li-ion, pulsed for NiMH). The 20 MHz CPU executes the charge algorithm with deterministic timing, while 22 I/O pins monitor cell voltage dividers, thermistor sensors, and LED status indicators. OTP memory locks in the chemistry-specific firmware (Li-ion vs NiMH vs lead-acid) without risk of accidental firmware corruption in the field.
Recommended
Smart Card and Access Control Readers
The PIC16C62BT-20/SO is widely deployed in smart card readers and door-access controllers because its USART and I/O pins support both legacy Wiegand and modern OSDP reader protocols. The 3.5 KB OTP memory holds the credential database and authentication handshake logic, and the on-chip hardware AES-friendly instruction set enables acceptable symmetric-cipher throughput. The integrated watchdog timer prevents the reader from hanging in mid-authentication, a critical security property for unattended access-control installations.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C62BT-20/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C62B-20I/SO | PIC16C62B-20E/SO | PIC16C62B-20/SO | PIC16C62BT-20I/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| I/O Pins | 22 | 22 | 22 | 22 | 22 |
| Operating Temperature | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Key Differentiators
- Commercial temperature grade optimized for indoor appliance/consumer use (vs PIC16C62B-20I/SO)
- Tape-and-reel packaging for high-volume SMT assembly lines (vs PIC16C62B-20/SO)
- Same B-revision silicon and pinout as the entire PIC16C62B-20x family (vs PIC16C62A-04/SO)
Design Notes
The 28-SOIC (7.50 mm body) package uses a 1.27 mm pin pitch and reflow-solders on standard FR-4 with no thermal pad; thermal dissipation is limited to PCB copper pour. Place a 100 nF decoupling capacitor within 5 mm of the VDD pin (pin 19), plus a 10 uF bulk capacitor on the same rail. The second VSS pin (pin 28) should be tied directly to the ground plane with a short trace or via to reduce digital switching noise on analog measurements via AN0-AN4. Estimated: at 20 MHz CPU and 5 V supply, typical core current is 10 mA, so 0.05 W of dissipation does not require an explicit thermal relief pattern.
OTP EPROM cells cannot be erased by software or UV light - any firmware bug becomes a permanently defective MCU. Always prototype with the flash-based PIC16F62x equivalent in the same 28-SOIC pinout (PIC16F628, PIC16F627A) before committing to the OTP PIC16C62B for production. The programming voltage Vpp on the MCLR/Vpp pin must reach 13 V nominal during device programming; ensure your programmer supports the 13 V Vpp specification, not just the 5 V low-voltage programming used by flash parts. Brown-out-reset trip voltage should be configured for the actual minimum VDD expected in the application (typically 3.0 V for 3.3 V systems).
Estimated: at 20 MHz CPU and 5 V supply, the PIC16C62B draws approximately 10 mA active current; at 32 kHz LP oscillator mode the same part drops below 100 uA. For battery-backed applications (e.g., thermostats, security keypads) use the SLEEP instruction with the watchdog timer disabled to enter a sub-100 nA sleep state, and wake on the RB0/INT external interrupt or the watchdog timeout. The brown-out reset circuitry must be configured to a trip voltage above the minimum VDD at which the oscillator remains stable - otherwise the part will wake into an undefined state with corrupt RAM.
The 28-SOIC package has no integrated ground or power plane below the die; high-speed digital outputs on port C (RC3-RC7) can couple noise into adjacent analog inputs on port A (RA0-RA3). Route the analog traces on the opposite side of the PCB from the digital switching traces, with a ground pour between them. The OSC1/OSC2 pins should be kept short and surrounded by ground pour, particularly when using the high-frequency HS oscillator mode (>4 MHz). The MCLR pin requires a 10 kohm pull-up to VDD plus a 100 nF capacitor to ground to suppress ESD-induced reset events.
Compliance Information
RoHS compliance per Microchip product declaration. AEC-Q100 not qualified - choose PIC16C62B-20E/SO for automotive-grade applications. REACH and halogen-free status not explicitly published; consult Microchip for current declarations.
