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Microchip Technology MCP4661T-103E/ML
- Part No.:
- MCP4661T-103E/ML
- Manufacturer:
- Microchip Technology
- Category:
- Digital Potentiometers
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
MCP4661T-103E/ML.pdf
- Description:
- IC DGTL POT 10KOHM 257TAP 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,752
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Product details
Overview
MCP4661T-103E/ML from Microchip Technology is a dual-channel, 8-bit nonvolatile digital potentiometer in QFN-16 (4×4 mm) package with 10 kΩ end-to-end resistance per channel, I²C interface supporting up to 3.4 MHz, WiperLock™ technology, and operation from –40°C to +125°C. It replaces mechanical potentiometers in precision gain/offset trimming, sensor calibration, and programmable power supply feedback loops.
For engineers reviewing the MCP4661T-103E/ML datasheet, MCP4661T-103E/ML pinout, MCP4661T-103E/ML application, or MCP4661T-103E/ML equivalent, key selection criteria include dual-potentiometer topology, EEPROM wiper retention, 75 Ω typical wiper resistance, 15 ppm/°C ratiometric tempco, and QFN-16 thermal pad compatibility for high-reliability industrial control designs.
Technical Context
The MCP4661T-103E/ML implements two independent 257-step (8-bit) resistor networks with potentiometer configuration (P0A/P0W/P0B and P1A/P1W/P1B), each storing wiper position in nonvolatile EEPROM and supporting automatic recall at power-up. Its I²C interface includes hardware write-protect (WP pin) and software-configurable write protection, plus Terminal Control (TCON) register for individual terminal disconnect.
WiperLock™ technology enables permanent locking of calibrated wiper values via high-voltage programming on the HVC/A0 pin, preventing accidental overwrites during system operation. The device features brown-out reset (1.5 V typical), 2.5 µA serial-inactive current, and high-voltage tolerant digital inputs rated to 12.5 V - enabling direct interfacing with mixed-voltage microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resistance | 10 kΩ ±20% per channel - matches standard feedback network values for op-amp gain setting and voltage divider applications. |
| Resolution | 8-bit (257 steps) - provides 0.39% step resolution for fine-grained analog tuning without interpolation. |
| Wiper Resistance | 75 Ω typical - minimizes signal path error in low-impedance circuits and preserves linearity under load. |
| Ratiometric Tempco | 15 ppm/°C - ensures stable voltage division ratio across –40°C to +125°C, critical for sensor signal conditioning. |
| I²C Speed | Up to 3.4 MHz - enables fast wiper updates during real-time calibration or dynamic compensation routines. |
| Supply Range | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V logic domains while maintaining full analog performance. |
| Nonvolatile Memory | 10 general-purpose 9-bit EEPROM locations + wiper storage - retains calibration data through power cycles without external memory. |
Pinout & Package
Package: QFN-16 (4×4 mm), exposed thermal pad (EP), lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (P0W) | Potentiometer 0 wiper | Analog output node; connects to op-amp inverting input or ADC reference point for adjustable gain/offset. |
| 2 (P0B) | Potentiometer 0 terminal B | Fixed end of RAB0; tied to ground or reference voltage to configure as rheostat or potentiometer. |
| 3 (P0A) | Potentiometer 0 terminal A | Fixed end of RAB0; connected to supply or signal source to complete voltage divider or variable resistance path. |
| 4 (VSS) | Ground | Primary analog/digital return; must be low-impedance connection to minimize noise coupling into resistor networks. |
| 5 (VDD) | Power supply | Supplies core logic and resistor network; decoupling capacitor required within 1 cm of pin for stable operation. |
| 6 (A2) | I²C address bit 2 | Hardware-selectable device address; enables up to 8 MCP4661 devices on same I²C bus without software arbitration. |
| 7 (A1) | I²C address bit 1 | Second address bit; used with A2 and A0 to configure unique I²C slave address (0x2C–0x2F for MCP4661). |
| 8 (WP) | Hardware write protect | Active-low pin; when pulled low, disables all EEPROM and wiper writes - prevents field corruption during firmware updates. |
| 9 (P1B) | Potentiometer 1 terminal B | Fixed end of RAB1; independently configurable for dual-loop control (e.g., VOUT and IOUT regulation). |
| 10 (P1W) | Potentiometer 1 wiper | Second analog output; supports simultaneous dual-channel trimming without multiplexing latency. |
| 11 (P1A) | Potentiometer 1 terminal A | Fixed end of RAB1; allows independent biasing of second potentiometer for asymmetric feedback networks. |
| 12 (HVC/A0) | High-voltage control / address bit 0 | Enables WiperLock™ programming at ≥8.5 V; also serves as LSB of I²C address when <12.5 V. |
| 13 (SDA) | I²C data | Open-drain bidirectional bus line; requires external pull-up to VDD (1–10 kΩ) for proper I²C signaling. |
| 14 (SCL) | I²C clock | Input-only clock line; timing-critical for 3.4 MHz operation - trace length matching recommended for multi-device buses. |
| 15 (NC) | No connect | Internally unconnected; must remain floating or grounded per PCB layout guidelines to avoid parasitic coupling. |
| 16 (EP) | Exposed thermal pad | Thermal and electrical ground; must be soldered to large copper pour for junction temperature reduction and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 8-bit potentiometers | Independent RAB0 and RAB1 networks enable simultaneous adjustment of two analog parameters (e.g., gain + offset) without shared resource contention. |
| WiperLock™ technology | Permanent wiper value locking via 8.5–12.5 V pulse on HVC/A0 eliminates risk of unintended EEPROM writes during system debug or firmware updates. |
| Terminal Control (TCON) register | Per-terminal disconnect capability allows dynamic isolation of P0A/P0B/P1A/P1B - essential for safe power sequencing and fault containment. |
| 10 kΩ nominal resistance | Optimized for 3.3 V/5 V op-amp feedback networks with minimal current draw (<2.5 mA max per terminal) and predictable bandwidth (1 MHz @ 10 kΩ). |
| Extended temperature range | –40°C to +125°C operation with guaranteed specs ensures reliability in automotive engine control units and industrial motor drives. |
Applications
| Programmable Power Supply Feedback | Sensor Signal Conditioning |
|---|---|
Use Scenario: Adjusting output voltage and current limit thresholds in digitally controlled DC-DC converters and lab-grade power supplies. IC Role / Device Role / Timing Role: Dual-potentiometer provides independent setpoints for voltage-divider-based VOUT sensing and current-sense amplifier gain scaling. Use Value: Eliminates manual trimmer replacement; enables factory calibration storage and field firmware updates to adapt to aging components or new load profiles. | Use Scenario: Compensating for offset and gain drift in pressure, temperature, or current sensors across wide temperature ranges. IC Role / Device Role / Timing Role: Configures precision resistor ratios in instrumentation amplifier front-ends and ratiometric ADC reference dividers. Use Value: 15 ppm/°C ratiometric tempco maintains measurement accuracy without software compensation algorithms, reducing MCU overhead. |
| Industrial Motor Drive Biasing | Medical Instrument Calibration |
Use Scenario: Setting gate drive bias levels and current sense thresholds in three-phase inverter gate driver ICs. IC Role / Device Role / Timing Role: Provides isolated, nonvolatile adjustment of analog comparators and op-amps in high-noise motor control environments. Use Value: QFN-16 thermal pad and –40°C to +125°C rating ensure stable operation near heat-generating IGBT modules without derating. | Use Scenario: Factory calibration of ECG, EEG, or pulse oximeter front-end gain/offset before device sterilization and deployment. IC Role / Device Role / Timing Role: Stores final trimmed values in EEPROM to survive autoclave cycles and long-term shelf storage without battery backup. Use Value: WiperLock™ prevents accidental recalibration during routine maintenance or firmware upgrades, ensuring regulatory compliance traceability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5242BRUZ10 | Single-channel, 256-step, I²C, 10 kΩ, no EEPROM, 105 ppm/°C absolute tempco | Lacks nonvolatile storage and dual-channel integration; requires external memory for calibration persistence. | Select when cost sensitivity outweighs need for EEPROM and dual pots; verify thermal drift impact on closed-loop stability. |
| MCP4651T-103E/ST | Dual-channel, 256-step, I²C, 10 kΩ, volatile RAM only, TSSOP-14 package | No WiperLock™ or EEPROM; loses settings at power loss; smaller footprint but no thermal pad. | Choose for space-constrained designs where calibration is reloaded at boot; avoid in safety-critical or unattended systems. |
Compared with AD5242BRUZ10 and MCP4651T-103E/ST, the MCP4661T-103E/ML delivers guaranteed calibration retention, dual independent channels, and superior thermal stability - making it optimal for industrial and medical systems requiring zero-maintenance analog tuning.
Availability
MCP4661T-103E/ML is available at Aetrix Electronics and suitable for programmable power supplies, sensor signal conditioning, industrial motor drives, and medical instrument calibration requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MCP4661T-103E/ML 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 is a leading provider of microcontroller, analog, FPGA, and mixed-signal semiconductors headquartered in Chandler, Arizona, serving industrial, automotive, communications, and consumer markets.
The MCP4661 belongs to Microchip's digital potentiometer product line, designed specifically for replacing mechanical trimmers in high-reliability, calibration-critical applications where nonvolatile storage, temperature stability, and dual-channel integration are mandatory.
FAQ
What is the maximum I²C clock frequency supported by the MCP4661T-103E/ML?
The MCP4661T-103E/ML supports I²C clock frequencies up to 3.4 MHz in high-speed mode (with Cb ≤ 100 pF and VDD ≥ 4.5 V). At lower voltages or higher bus capacitance, it operates at 400 kHz (fast mode) or 100 kHz (standard mode), maintaining full functionality across all speeds. This flexibility allows optimization for speed in compact systems or noise immunity in electrically noisy environments.
Does the MCP4661T-103E/ML retain its wiper setting after power cycling?
Yes, the MCP4661T-103E/ML retains its wiper setting after power cycling because it uses nonvolatile EEPROM to store wiper positions. Upon power-up, the device automatically recalls the last saved wiper value for both channels. This behavior is guaranteed across the full –40°C to +125°C operating range and eliminates the need for host MCU initialization routines to restore calibration.
How does WiperLock™ technology work on the MCP4661T-103E/ML?
WiperLock™ technology on the MCP4661T-103E/ML permanently locks the wiper position by applying an 8.5–12.5 V pulse to the HVC/A0 pin. Once locked, no subsequent I²C command - including EEPROM writes - can modify the wiper value until the device is replaced. This prevents accidental or malicious overwrites during field operation, debugging, or firmware updates, ensuring calibration integrity in certified medical or industrial equipment.
What is the purpose of the exposed thermal pad (EP) on the MCP4661T-103E/ML QFN package?
The exposed thermal pad (EP) on the MCP4661T-103E/ML QFN-16 package serves dual functions: thermal dissipation and electrical grounding. It must be soldered to a dedicated PCB copper pour connected to VSS to reduce junction temperature rise during continuous operation and suppress high-frequency noise coupling into sensitive analog terminals. Omitting EP connection degrades thermal performance and may cause parametric drift at elevated ambient temperatures.
Can the MCP4661T-103E/ML be used as a rheostat instead of a potentiometer?
Yes, the MCP4661T-103E/ML can be configured as a rheostat by leaving either terminal A or B floating and using the remaining terminal plus the wiper (e.g., P0A and P0W only). The Terminal Control (TCON) register further enables software-controlled disconnection of any terminal, allowing dynamic reconfiguration between potentiometer and rheostat modes during system operation without external switches.
MCP4661T-103E/ML Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 2
- Number of Taps:
- 257
- Resistance (Ohms):
- 10k
- Interface:
- I2C
- Memory Type:
- Non-Volatile
- Voltage - Supply:
- 1.8V ~ 5.5V
- Features:
- Mute, Selectable Address
- Tolerance:
- ±20%
- Temperature Coefficient (Typ):
- 150ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-QFN (4x4)
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 75
MCP4661T-103E/ML FAQ
1.How can I place an order for MCP4661T-103E/ML through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP4661T-103E/ML 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 MCP4661T-103E/ML reliable?
The price and inventory of MCP4661T-103E/ML are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP4661T-103E/ML is usually 5 days.
3.What payment methods are accepted for MCP4661T-103E/ML?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP4661T-103E/ML transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP4661T-103E/ML?
MCP4661T-103E/ML orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP4661T-103E/ML 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 MCP4661T-103E/ML?
For technical support, including MCP4661T-103E/ML datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP4661T-103E/ML requirements.
6.How does Aetrix verify that MCP4661T-103E/ML is sourced from the original manufacturer or authorized distributors?
All MCP4661T-103E/ML 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 MCP4661T-103E/ML meets industry standards.
7.What is the process for return or replacement of MCP4661T-103E/ML?
All MCP4661T-103E/ML units undergo pre-shipment inspection (PSI). If there is an issue with MCP4661T-103E/ML, 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 MCP4661T-103E/ML part is unused and in its original packaging.
Return procedure for MCP4661T-103E/ML:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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