MCP3208-BI/SL - 12-Bit 8-Channel SPI ADC | Microchip
MPN: MCP3208-BI/SL ✓ ActiveMCP3208-BI/SL Overview
An ADC is a data-conversion IC that converts an analog voltage into a digital code for processing, logging, display, or closed-loop control. The MCP3208 belongs to the ADC → data-converter IC → semiconductor hierarchy. Its SAR architecture repeatedly compares the sampled input with an internal reference to produce a 12-bit result. This makes it suitable for adding general-purpose analog measurement to a microcontroller that does not include enough onboard ADC channels.
The converter provides eight analog input channels that can be used as eight single-ended inputs or four pseudo-differential input pairs. Maximum differential nonlinearity is ±1 LSB and maximum integral nonlinearity is ±2 LSB for the MCP3208. The SPI interface supports modes 0,0 and 1,1, while the input structure includes an onboard sample-and-hold circuit. These features balance useful conversion resolution with a straightforward host-controller interface.
MCP3208-BI/SL operates from a 2.7 V supply, and its analog reference and digital interface support embedded-system integration. The SPI interface transfers the 12-bit conversion result while minimizing pin count compared with a parallel ADC. The 16-SOIC package has a 3.90 mm body width and supports industrial temperature operation from -40°C to +85°C, making it appropriate for compact control boards requiring analog inputs beyond the capabilities of the host MCU.
Typical uses include temperature-sensor monitoring, potentiometer position acquisition, current and voltage measurement, industrial panel controls, and multichannel data acquisition. Differential channels can improve rejection of common-mode voltage when paired with suitable sensor circuitry. The 100 ksps rate supports rapidly changing analog signals, although each conversion is initiated and read through the SPI interface.
Design the analog and digital sections to minimize noise and ground currents. Place the decoupling and reference components near the converter, route SPI signals away from sensitive analog inputs, and account for reference accuracy when calculating overall measurement error. For battery-powered systems, verify the selected conversion rate and shutdown behavior against the available current budget.
Drop-in alternatives for MCP3208-BI/SL — 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 MCP3208-BI/SL (same form factor and footprint) — differing in Package, Number of Input Channels, Resolution, Mounting Type, Architecture.
MCP3208T-BI/SL
✅ Drop-In📋 Reference alternative (not in catalog)
MCP3208T-CI/SL
✅ Drop-In📋 Reference alternative (not in catalog)
MCP3208-CI/SL
✅ Drop-InContact for price
View Datasheet →MCP3208-BI/SLVAO
✅ Drop-In📋 Reference alternative (not in catalog)
MCP3208-CI/SLVAO
✅ Drop-In📋 Reference alternative (not in catalog)
MCP3208-BI/SL Maximum Ratings & Electrical Characteristics
| ADC Resolution | 12 bit |
| Architecture | Successive approximation register (SAR) |
| Number of Input Channels | 8 channels |
| Differential Input Channels | 4 channels |
| Maximum Sampling Rate | 100 ksps |
| Supply Voltage | 2.7 V |
| Maximum Differential Nonlinearity | ±1 LSB |
| Maximum Integral Nonlinearity | ±2 LSB |
| Serial Interface | SPI, modes 0,0 and 1,1 |
| Input Configuration | 8 single-ended or 4 pseudo-differential inputs |
| Sample-and-Hold | On-chip |
| Operating Temperature | -40°C to +85°C |
| Package | 16-SOIC, 3.90 mm body width |
| Mounting Type | Surface mount |
| Packaging | Tube |
MCP3208-BI/SL 16-soic, 3.90 mm body width Pin Configuration Guide
Pin configuration for MCP3208-BI/SL (16-soic, 3.90 mm body width package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for MCP3208-BI/SL.
Refer to the datasheet for full pin configuration.
Typical Applications
MCP3208-BI/SL is suitable for 6 applications: Industrial Temperature and Pressure Monitoring, Automotive Sensor Interface, Battery-Powered Sensor Node, Precision Potentiometer and Control Input, Data Acquisition and Process Monitoring, Portable Measurement Instrument.
Industrial Temperature and Pressure Monitoring
The MCP3208-BI/SL fits multichannel industrial monitoring because it combines eight single-ended inputs, four pseudo-differential configurations, 12-bit resolution, and a 100 ksps maximum sampling rate. It can be positioned between sensor conditioners and a microcontroller SPI port, allowing temperature, pressure, level, or current signals to be digitized on one board. Differential pairs can reduce common-mode interference when the sensor circuit is designed for that connection. Its -40°C to +85°C operating range suits industrial equipment, while the SPI interface avoids consuming the parallel data bus pins that a 12-bit parallel ADC would require. The key design constraint is maintaining a low-noise reference and separating analog input routing from high-speed SPI clock traces.
Recommended
Automotive Sensor Interface
MCP3208-BI/SL can serve as the sensing element in a compact automotive or vehicle-control module when the system requires several analog inputs and an industrial-temperature operating range of -40°C to +85°C. The converter accepts eight single-ended channels or four pseudo-differential pairs at up to 100 ksps, enabling pressure, position, and analog sensor inputs to be sampled by an automotive MCU. The 16-SOIC package supports compact board layouts, while SPI provides a deterministic serial transfer path. Automotive production suitability must be confirmed against the required AEC-Q100 qualification and the exact ordering suffix before release; the converter's basic electrical capability alone does not establish automotive compliance.
Recommended
Battery-Powered Sensor Node
The MCP3208-BI/SL is suitable for battery-powered environmental sensors that need more analog inputs than a low-power MCU provides. Its 12-bit SAR conversion supports 100 ksps operation, while eight single-ended inputs can consolidate resistive sensors such as thermistors, light sensors, and potentiometers. The SPI host interface also limits the number of signal lines required on a compact board. A designer can use scheduled or on-demand conversions to control energy use instead of sampling every channel continuously. Reference stability remains important because it contributes directly to code accuracy, and the analog section should be powered and bypassed according to the manufacturer guidance to prevent switching activity from corrupting sensor readings.
Recommended
Precision Potentiometer and Control Input
MCP3208-BI/SL provides a practical 12-bit interface for potentiometers, rotary controls, and analog setpoints in embedded control panels. Multiple channels can be sampled through the same SPI bus, reducing wiring and allowing one controller to manage several physical inputs. A maximum sampling rate of 100 ksps is more than sufficient for common human-operated controls while providing short conversion latency. Input impedance, divider resistance, reference accuracy, and grounding determine practical resolution; a nominal 12-bit converter does not guarantee ideal 12-bit system accuracy. Use stable divider and reference components, keep sensitive input traces short, and sample repeatedly when reducing noise or updating a displayed position.
Recommended
Data Acquisition and Process Monitoring
The MCP3208-BI/SL is appropriate for process-monitoring boards that digitize several slowly changing or moderately varying analog signals. Its eight-channel single-ended mode supports pressure, level, flow-sensor, and actuator-feedback inputs, while four pseudo-differential channels can support bridge-style sensors. The 12-bit result width and 100 ksps maximum rate provide a practical balance between measurement resolution, throughput, and SPI simplicity. A host MCU can timestamp and process each conversion, making the converter useful in laboratory equipment and compact industrial data loggers. For accurate results, protect inputs from excessive transients, maintain consistent reference impedance, and isolate switching regulators and digital clocks from the analog input network.
Recommended
Portable Measurement Instrument
MCP3208-BI/SL fits portable meters and field-measurement products where analog inputs must be added without consuming a parallel bus. The 12-bit converter can digitize up to eight single-ended channels at 100 ksps and communicate through a compact SPI interface to a display-capable microcontroller. This arrangement supports handheld probes, resistance measurements, and general signal inspection while keeping the circuit manageable in a 16-SOIC footprint. For battery-powered operation, initiate conversions only when required and use the converter and reference circuit within their specified operating limits. Calibration should account for offset, gain, reference tolerance, and source impedance, particularly if readings must remain accurate over temperature or battery-voltage changes.
Recommended
Recommended Products Summary
Engineering reference data for MCP3208-BI/SL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MCP3208T-BI/SL | MCP3208T-CI/SL | MCP3208-CI/SL | MCP3208-BI/SLVAO | MCP3208-CI/SLVAO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 16-SOIC | 16-SOIC - same | 16-SOIC - same | 16-SOIC - same | 16-SOIC - same | 16-SOIC - same |
| ADC Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Architecture | 12-bit SAR | 12-bit SAR | 12-bit SAR | 12-bit SAR | 12-bit SAR | 12-bit SAR |
| Input Configuration | 8 single-ended or 4 pseudo-differential | 8 single-ended or 4 pseudo-differential | 8 single-ended or 4 pseudo-differential | 8 single-ended or 4 pseudo-differential | 8 single-ended or 4 pseudo-differential | 8 single-ended or 4 pseudo-differential |
| Maximum Sampling Rate | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 100 ksps |
| Serial Interface | SPI, modes 0,0 and 1,1 | SPI | SPI | SPI | SPI | SPI |
Key Differentiators
- Eight-channel measurement capacity in a compact serial-interface ADC (vs MCP3208-CI/SL)
- 100 ksps acquisition rate for fast-changing analog inputs (vs MCP3208T-CI/SL)
- Industrial-temperature operation in a 16-SOIC package (vs MCP3208-CI/SLVAO)
Design Notes
Use the manufacturer pin-description table when routing the 16-pin SOIC footprint, and verify every net against the selected ordering code. Keep the SPI clock, data input, and data output traces away from the eight analog input nodes. Place bypass and reference components adjacent to their associated pins rather than distributing them around the board. The analog return path should remain continuous beneath or near the converter to reduce voltage drops and noise coupling into the sampled signal.
Treat the external reference as part of the measurement system because reference error contributes directly to conversion accuracy. Use the voltage and impedance recommended by the Microchip datasheet, minimize the distance from the reference source to VREF+, and connect VREF− to the appropriate analog return. For low-frequency measurements, take multiple samples and average them when the source impedance and converter noise permit it; do not assume averaging can correct unstable reference voltage.
Do not interchange MCP3208 ordering codes solely because their base family names match. BI, CI, T, and VAO appear in comparison and cross-reference results, but the complete suffix can affect temperature grade, qualification, or packaging. Verify those attributes for the exact alternative, confirm the 16-SOIC footprint and pin mapping, and review the manufacturer datasheet before approving a substitution. The core 12-bit and 100 ksps ratings alone do not establish full ordering-code equivalence.
Provide the converter with a stable 2.7 V supply and decouple supply and reference pins according to the manufacturer application guidance. Keep switching-regulator loops and high-current return paths away from the analog input and reference network. If several ADC channels are sampled simultaneously or at a high rate, confirm that source impedance and capacitance do not prevent the sampling network from settling within the acquisition time. This check is especially important for long sensor cables or resistive dividers.
Compliance Information
No definitive RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was extracted for the exact MCP3208-BI/SL ordering code.
