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Microchip Technology MCP4631-103E/ST
- Part No.:
- MCP4631-103E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Digital Potentiometers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MCP4631-103E/ST.pdf
- Description:
- IC DGT POT 10KOHM 129TAP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:610
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Product details
Overview
MCP4631-103E/ST from Microchip Technology is a dual-channel, 7-bit volatile digital potentiometer in TSSOP-14 package with 10 kΩ end-to-end resistance per channel, I²C interface (up to 3.4 MHz), and mid-scale power-on wiper reset. It delivers 129-step resolution, 75 Ω typical wiper resistance, and operates from 1.8V to 5.5V supply - ideal for precision gain/offset trimming in industrial sensor signal conditioning circuits.
For engineers reviewing the MCP4631-103E/ST datasheet, MCP4631-103E/ST pinout, MCP4631-103E/ST application, or MCP4631-103E/ST equivalent, key selection considerations include dual-potentiometer topology, TSSOP-14 footprint compatibility, I²C timing compliance at 400 kHz/3.4 MHz, and guaranteed operation across –40°C to +125°C ambient temperature.
Technical Context
The MCP4631-103E/ST integrates two independent 7-bit resistor networks (P0 and P1), each configurable as potentiometer (A–W–B) or rheostat (A–W or W–B). Its I²C interface supports standard, fast, and high-speed modes with programmable address pins (A0/A1/A2) and hardware write-protect (HVC/A0).
Each channel features terminal disconnect via the TCON register, brown-out reset (~1.5 V), and low serial interface inactive current (2.5 µA typ). Ratiometric tempco is 15 ppm/°C (mid-scale), absolute tempco is 50 ppm/°C (0°C to 70°C), and bandwidth reaches 1 MHz (10 kΩ, code = 40h).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent potentiometer networks - enables simultaneous gain and offset control in single-supply op-amp stages. |
| Resolution | 7-bit (129 steps) - provides sufficient granularity for calibration without excessive I²C overhead in embedded systems. |
| RAB | 10 kΩ ±20% - matches common feedback network values for voltage reference scaling and sensor bridge biasing. |
| Wiper Resistance | 75 Ω typical - minimizes insertion error in low-impedance signal paths (e.g., <100 kΩ amplifier feedback loops). |
| I²C Speed | Up to 3.4 MHz - supports rapid wiper updates during dynamic calibration sequences without CPU polling bottlenecks. |
| Tempco (Ratiometric) | 15 ppm/°C (mid-scale) - ensures stable voltage division ratio over temperature in precision analog front-ends. |
| Supply Range | 1.8V to 5.5V - interoperable with both 3.3V microcontrollers and legacy 5V logic, simplifying mixed-voltage board design. |
Pinout & Package
TSSOP-14 package (4.4 mm × 5.0 mm, 0.65 mm pitch), thermally enhanced with exposed pad (EP) connected to VSS per Microchip DS22096B-page 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A2) | I²C address bit 2 | Configures device slave address (0x2C–0x2F); tied high/low or left floating for multi-device bus addressing. |
| 2 (A1) | I²C address bit 1 | Part of 3-bit hardware address (A2/A1/A0); enables up to 8 devices on same I²C bus without software arbitration. |
| 3 (NC) | No connect | Internally unconnected - must remain unpopulated or grounded per layout guidelines to avoid parasitic coupling. |
| 4 (VDD) | Positive supply | Power rail for logic and resistor networks; decoupling capacitor (0.1 µF) required within 5 mm of pin. |
| 5 (P0W) | Potentiometer 0 wiper | Analog output node; connects to op-amp inverting input or ADC reference divider - low impedance critical for settling time. |
| 6 (P0B) | Potentiometer 0 terminal B | Fixed end of RAB0; typically tied to ground or negative reference in single-supply configurations. |
| 7 (P0A) | Potentiometer 0 terminal A | Fixed end of RAB0; connects to VDD or positive reference - defines full-scale voltage range. |
| 8 (P1A) | Potentiometer 1 terminal A | Independent RAB1 high-side terminal - allows separate biasing for dual-path signal chains (e.g., differential sensor pairs). |
| 9 (P1W) | Potentiometer 1 wiper | Second analog control node; supports independent calibration of complementary circuit branches. |
| 10 (P1B) | Potentiometer 1 terminal B | Independent RAB1 low-side terminal - enables true dual-rail adjustment without shared reference constraints. |
| 11 (VSS) | Ground | Common return for analog/digital domains; EP pad must be soldered to solid ground plane for thermal and noise performance. |
| 12 (HVC/A0) | I²C address bit 0 / Write-protect | Address bit when pulled low/high; functions as hardware write-protect when driven high (VIHH ≥ VDD + 4.5V). |
| 13 (SDA) | I²C data line | Open-drain bidirectional bus line - requires external pull-up (2.2 kΩ to VDD) and meets 3.4 MHz rise/fall time specs. |
| 14 (SCL) | I²C clock line | Open-drain clock input - synchronizes all register reads/writes; timing validated per Table 1-1/1-2 in DS22096B. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 7-bit potentiometers | Enables concurrent calibration of two analog signal paths (e.g., gain + offset) without software multiplexing overhead. |
| Volatile wiper memory | Mid-scale default on power-up eliminates startup transients in closed-loop systems requiring known initial state. |
| Terminal disconnect (TCON) | Software-controlled isolation of A/W/B terminals prevents loading effects during measurement or standby modes. |
| High-voltage tolerant inputs | HVC/A0, A1, A2 accept up to 12.5 V - allows direct interfacing with 5 V or 12 V control logic without level shifters. |
| Brown-out reset (BOR) | ~1.5 V threshold ensures deterministic wiper initialization during undervoltage conditions, preventing undefined analog outputs. |
| Extended temperature range | –40°C to +125°C operation certified - suitable for under-hood automotive sensors and industrial motor drives. |
Applications
| Industrial Sensor Calibration | Programmable Gain Amplifier |
|---|---|
|
Use Scenario: Calibrating zero and span of 4–20 mA pressure transmitters in factory automation PLC modules. IC Role / Device Role / Timing Role: MCP4631-103E/ST provides dual-ratio adjustment: one channel trims offset (P0), the other sets gain (P1) in a single instrumentation amplifier stage. Use Value: Eliminates manual trimpots, enabling automated factory calibration and field recalibration via I²C - reducing test time by >60%. |
Use Scenario: Configuring variable gain for analog front-end of vibration monitoring system with MEMS accelerometers. IC Role / Device Role / Timing Role: MCP4631-103E/ST acts as digitally controlled feedback resistor in non-inverting op-amp configuration, dynamically adapting to signal amplitude. Use Value: 129-step resolution maintains SNR > 80 dB across 10× gain range; 1 MHz bandwidth preserves 10 kHz sensor bandwidth. |
| Medical Instrument Offset Trim | Automotive Cabin Temperature Control |
|
Use Scenario: Adjusting DC bias in ECG electrode amplifiers to suppress common-mode interference while preserving sub-mV signal fidelity. IC Role / Device Role / Timing Role: MCP4631-103E/ST serves as precision voltage divider in op-amp summing junction, referenced to stable bandgap. Use Value: 15 ppm/°C ratiometric tempco ensures <0.1% offset drift over 0–50°C patient operating range - meeting IEC 60601-2-27 requirements. |
Use Scenario: Fine-tuning thermistor-based cabin air temperature feedback in HVAC control units across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: MCP4631-103E/ST replaces mechanical potentiometers in voltage divider network feeding microcontroller ADC. Use Value: Guaranteed operation to +125°C junction temperature supports placement near heater cores; 10 kΩ value optimizes ADC quantization noise floor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP4651-103E/ST | 8-bit resolution (257 steps), same package and RAB, identical I²C interface and tempco. | Higher resolution required for <0.5% full-scale calibration accuracy in metrology-grade instruments. | Select when finer wiper granularity justifies increased I²C transaction size and marginally higher cost. |
| AD5232BRUZ10 | Non-volatile EEPROM wiper storage, SPI interface, 10 kΩ, but only single-channel and wider TSSOP-16 package. | Systems requiring power-loss retention of last calibrated setting (e.g., medical devices with battery backup). | Choose when persistent wiper state is mandatory and dual-channel functionality can be implemented via two devices or alternate architecture. |
Compared with MCP4651-103E/ST, the MCP4631-103E/ST trades resolution for faster I²C update cycles and lower firmware complexity; versus AD5232BRUZ10, it offers true dual-channel integration and smaller footprint but requires host-initiated recalibration after power cycle.
Availability
MCP4631-103E/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplification, and medical instrument offset trimming requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MCP4631-103E/ST includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and connectivity solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The MCP46XX family was designed specifically for precision analog trimming in harsh-environment applications - emphasizing wide temperature operation, I²C flexibility, and robust parametric stability across voltage and process variation.
FAQ
What is the wiper resistance specification for the MCP4631-103E/ST?
The MCP4631-103E/ST has a typical wiper resistance of 75 Ω at VDD = 5.5 V and IW = 2.0 mA (code = 00h), with a maximum of 160 Ω under those conditions. At VDD = 2.7 V, the max wiper resistance rises to 300 Ω. This low on-resistance minimizes gain error in op-amp feedback networks where the wiper connects directly to the inverting input.
Does the MCP4631-103E/ST retain wiper settings after power cycling?
No, the MCP4631-103E/ST uses volatile RAM for wiper storage and resets to mid-scale (code = 40h) on power-up or brown-out. This behavior is confirmed in the Device Features table (DS22096B-page 2) and ensures predictable startup states - unlike non-volatile alternatives such as the MCP4641 or AD5232.
Can the MCP4631-103E/ST be used as a rheostat?
Yes, the MCP4631-103E/ST supports rheostat configuration by floating either terminal A or B of each potentiometer channel, as explicitly stated in Note 1 on DS22096B-page 2. This allows use as a two-terminal variable resistor - for example, in LED current limiting or bias current adjustment circuits.
What is the maximum I²C clock frequency supported by the MCP4631-103E/ST?
The MCP4631-103E/ST supports I²C clock frequencies up to 3.4 MHz in high-speed mode (VDD ≥ 4.5 V, Cb ≤ 100 pF), as specified in Table 1-1 (DS22096B-page 13). At 400 kHz (fast mode), it operates across the full 2.7–5.5 V supply range, making it compatible with most microcontroller I²C peripherals without timing constraints.
How does the terminal disconnect feature work in the MCP4631-103E/ST?
The MCP4631-103E/ST implements terminal disconnect via the Terminal Control (TCON) register, allowing software to electrically isolate any combination of terminals A, W, or B on either potentiometer channel. This prevents unwanted loading during system self-test or sleep modes - a capability documented in the Features list and block diagram (DS22096B-page 1 and 2).
MCP4631-103E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 2
- Number of Taps:
- 129
- Resistance (Ohms):
- 10k
- Interface:
- I2C
- Memory Type:
- Volatile
- Voltage - Supply:
- 1.8V ~ 5.5V
- Features:
- Selectable Address
- Tolerance:
- ±20%
- Temperature Coefficient (Typ):
- 150ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-TSSOP
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 75
MCP4631-103E/ST FAQ
1.How can I place an order for MCP4631-103E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP4631-103E/ST on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MCP4631-103E/ST reliable?
The price and inventory of MCP4631-103E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP4631-103E/ST is usually 5 days.
3.What payment methods are accepted for MCP4631-103E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP4631-103E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP4631-103E/ST?
MCP4631-103E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP4631-103E/ST order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MCP4631-103E/ST?
For technical support, including MCP4631-103E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP4631-103E/ST requirements.
6.How does Aetrix verify that MCP4631-103E/ST is sourced from the original manufacturer or authorized distributors?
All MCP4631-103E/ST products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCP4631-103E/ST meets industry standards.
7.What is the process for return or replacement of MCP4631-103E/ST?
All MCP4631-103E/ST units undergo pre-shipment inspection (PSI). If there is an issue with MCP4631-103E/ST, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MCP4631-103E/ST part is unused and in its original packaging.
Return procedure for MCP4631-103E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP4631-103E/ST Tags
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MCP4018T-103E/LT
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MCP4011T-103E/SN
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MCP4531T-103E/MF
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