PIC16F721-E/P - 8-Bit 16MHz 7KB Flash MCU | Microchip
MPN: PIC16F721-E/P ✓ ActivePIC16F721-E/P Overview
A microcontroller is a programmable integrated circuit containing a CPU core, memory, I/O ports, and embedded peripherals. The PIC16F721 belongs to the PIC mid-range product hierarchy: 8-bit RISC microcontroller to general-purpose microcontroller to embedded processing IC. Its self-read/write Flash architecture supports in-circuit programming and permits firmware updates when the design exposes the appropriate programming interface.
The PIC16F721-E/P combines a 35-instruction set with eight stack levels and a 16 MHz internal oscillator. Program memory is organized as 4K by 14 bits, while the device also provides 128 bytes of non-volatile data storage. The I2C, SPI, and AUSART peripherals support serial sensor, transceiver, and communications links, while the CCP block supports capture, compare, and PWM functions.
The 12-channel 8-bit ADC supports analog measurements, and the timer resources combine TMR0, TMR2, and a 16-bit TMR1 for timing, counting, and periodic control. Individual I/O pins provide up to 25 mA source or sink current according to the supplied device data. Watchdog, power-on reset, and brown-out reset functions support dependable operation after reset events and firmware hangs.
Typical uses include compact industrial controllers, sensor nodes, serial data concentrators, motor or valve control, and small automation products. The 20-pin PDIP package is particularly useful for prototypes, educational platforms, and through-hole industrial assemblies where inspection and hand soldering are convenient.
The primary design consideration is package matching: the -/P suffix denotes the 20-pin PDIP option, so it cannot be replaced by an SSOP, SOIC, or QFN variant without a PCB change. Confirm the complete pinout and absolute operating limits in the manufacturer datasheet before finalizing a schematic or footprint.
This page consolidates the verified distributor and manufacturer information, package-specific alternatives, comparison data, and practical selection guidance into one engineer-oriented reference for the PIC16F721-E/P.
Drop-in alternatives for PIC16F721-E/P — 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 PIC16F721-E/P (same form factor and footprint) — differing in Package, Internal Oscillator, Instruction Set, Operating Temperature, ADC.
PIC16F721-I/P
✅ Drop-InContact for price
View Datasheet →PIC16F720-I/P
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →PIC16F720-E/P
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →PIC16F721-E/P Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit PIC mid-range flash microcontroller |
| Manufacturer | Microchip Technology |
| CPU Architecture | PIC RISC mid-range core |
| Processor Width | 8 bit |
| Maximum Stated Clock Speed | 20 MHz |
| Internal Oscillator | 16 MHz |
| Instruction Set | 35 instructions |
| Stack Levels | 8 levels |
| Program Memory | 7 KB Flash, organized as 4K x 14 bits |
| Program Memory Features | Self read/write Flash memory |
| SRAM | 256 B |
| Non-Volatile Data Storage | 128 B |
| I/O Pins | 18 pins |
| I/O Current | 25 mA source/sink |
| ADC | 12-channel, 8-bit |
| Serial Interfaces | I2C, SPI, AUSART |
| Capture/Compare/PWM | CCP |
| 8-Bit Timers | 2, TMR0 and TMR2 |
| 16-Bit Timers | 1, TMR1 |
| Reset and Supervision | Watchdog timer, power-on reset, brown-out reset |
| Programming | In-circuit serial programming |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Operating Voltage Options | 2.5 V, 3.3 V, 5 V |
| Package | 20-pin PDIP, 0.300 in, 7.62 mm pitch |
| Mounting Type | Through-hole |
| Lifecycle Status | Active; in production |
PIC16F721-E/P 20-pin pdip, 0.300 in, 7.62 mm pitch Pin Configuration Guide
Pin configuration for PIC16F721-E/P (20-pin pdip, 0.300 in, 7.62 mm pitch 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 PIC16F721-E/P.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC16F721-E/P is suitable for 6 applications: Industrial Sensor Controller, Serial Data Concentrator, Small Motor and Valve Control, Protocol Bridge and Sensor Node, Battery-Powered Monitoring Device, Education and Rapid Prototyping.
Industrial Sensor Controller
PIC16F721-E/P fits a compact industrial sensor controller because its 12-channel 8-bit ADC can monitor several analog inputs while two 8-bit timers and one 16-bit timer organize sampling and control periods. The 18 available I/O pins can connect discrete sensors, status indicators, and actuator drivers without requiring a large external interface. Its 16 MHz internal oscillator simplifies the clock design. The 20-pin PDIP package also makes the controller practical for prototypes and through-hole industrial assemblies. Designers should confirm analog accuracy, channel switching requirements, and environmental limits in the datasheet.
Recommended
Serial Data Concentrator
PIC16F721-E/P can serve as a serial data concentrator when an installation must combine I2C, SPI, and AUSART-connected equipment into a common control node. The 7 KB self-read/write Flash provides room for protocol conversion and configuration logic, while 256 B SRAM supports temporary packet and status buffering. Its 35-instruction PIC mid-range core and eight-level stack are sufficient for modest coordination tasks. Firmware designers should budget baud-rate timing, buffering, and error recovery because the supplied data does not quantify guaranteed interface throughput.
Recommended
Small Motor and Valve Control
PIC16F721-E/P is appropriate for basic motor, valve, or relay sequencing where a microcontroller must generate timing signals and read feedback inputs. The CCP peripheral supports capture, compare, and PWM operations, and TMR0, TMR2, and TMR1 provide complementary timing resources for event scheduling. The 18 I/O pins leave room for control outputs and inputs, while the 20-pin PDIP package supports hand assembly during commissioning. For inductive loads, external drivers, flyback protection, and a suitably sized bulk capacitor remain mandatory rather than being assumed to be provided by the MCU.
Recommended
Protocol Bridge and Sensor Node
PIC16F721-E/P can bridge a sensor subsystem to a higher-level controller by supporting I2C, SPI, and AUSART within one compact device. The 12-channel 8-bit ADC is useful for legacy analog sensors, while digital interfaces handle more modern peripherals. With 7 KB of Flash and 256 B SRAM, the MCU fits small protocol-conversion and preprocessing tasks rather than demanding edge-compute workloads. The internal 16 MHz oscillator removes an external crystal requirement when its timing accuracy is adequate, but clock-tolerance analysis remains necessary for long communication frames or low-cost timing references.
Recommended
Battery-Powered Monitoring Device
PIC16F721-E/P can serve as the control element in a low-duty-cycle monitoring device because its mid-range core combines flash program memory, watchdog supervision, power-on reset, and brown-out reset in one package. The 16 MHz internal oscillator and serial peripherals support local sensor acquisition and periodic reporting, while the watchdog helps recover from unexpected firmware states. Its 2.5 V to 5.5 V supply range accommodates several rail choices. Battery suitability still depends on measured sleep current, analog-block behavior, and brown-out settings, none of which were quantified in the supplied records.
Recommended
Education and Rapid Prototyping
PIC16F721-E/P is well suited to education and rapid prototyping because it combines an accessible 8-bit architecture with 35 instructions, 18 I/O pins, and a conventional 20-pin PDIP footprint. Students can connect LEDs, switches, analog inputs, and serial modules without a fine-pitch assembly process. The 7 KB Flash, 256 B SRAM, three timers, ADC, and mixed serial interfaces provide enough capability for meaningful exercises and small control projects. The through-hole package is easy to inspect and replace, although it is larger and less production-efficient than modern surface-mount options.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F721-E/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F721-I/P | PIC16F720-I/P | PIC16F720-E/P |
|---|---|---|---|---|
| Package | 20-pin PDIP | 20-pin PDIP | 20-pin PDIP | 20-pin PDIP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Product Type | 8-bit PIC mid-range flash microcontroller | 8-bit PIC mid-range flash microcontroller | 8-bit PIC mid-range flash microcontroller | 8-bit PIC mid-range flash microcontroller |
| Temperature Grade Code | -E Extended | -I Industrial | -I Industrial | -E Extended |
Key Differentiators
- Through-hole package compatibility (vs PIC16F721-E/ML)
- Integrated analog and serial peripherals (vs PIC16F720-I/P)
- Same-family temperature-grade alternative (vs PIC16F721-I/P)
Design Notes
Use the Microchip 20-pin PDIP package drawing rather than a generic DIP footprint. The verified product is a 20-pin PDIP with a stated 0.300 in, 7.62 mm lead pitch. Confirm row spacing, pin numbering, and drill dimensions against the current datasheet before release. The same-family SSOP and SOIC ordering codes may share the PIC16F721 name but occupy different footprints, so using a surface-mount variant requires a PCB redesign and does not constitute a drop-in substitution.
Plan decoupling at every supply pin according to the Microchip datasheet, and place the required capacitors close to the device with short ground returns. The verified supply range is 2.5 V to 5.5 V, but this does not establish safe operation for every peripheral at both endpoints. Validate brown-out thresholds, operating current, and the behavior of unused I/O pins. Because exact current figures and capacitor recommendations were not supplied, obtain them from the manufacturer datasheet rather than deriving a production design from this page alone.
Do not treat the -E/P suffix as interchangeable with -E/ML, -E/SO, or other package codes. The verified DIP option is PIC16F721-E/P, whereas PIC16F721-E/ML is a 20-pin SSOP and therefore cannot replace the target on an existing through-hole PCB. Also avoid assuming that PIC16F720 variants are firmware-compatible with PIC16F721 without checking device differences, peripheral availability, configuration bits, and the complete memory map.
Keep analog inputs away from high-current switching nodes and route them with short traces over a quiet ground reference. The integrated 12-channel 8-bit ADC makes this MCU suitable for modest analog measurement, but the supplied records do not specify acquisition time, input impedance, reference accuracy, or channel-settling requirements. Follow the datasheet's analog-layout guidance, provide a stable reference, and avoid sharing narrow return paths with relay, motor, or switching-supply currents.
Compliance Information
The supplied records identify the device as lead-free in one package-related snippet, but they do not provide authoritative RoHS, REACH, AEC-Q100, halogen-free, or conflict-minerals declarations for the exact ordering code. No compliance claim is inferred.
