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Microchip Technology MCP4661T-103E/ST
- Part No.:
- MCP4661T-103E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Digital Potentiometers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MCP4661T-103E/ST.pdf
- Description:
- IC DGT POT 10KOHM 257TAP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,759
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Product details
Overview
MCP4661T-103E/ST from Microchip Technology is a dual-channel, 8-bit nonvolatile digital potentiometer in TSSOP-14 package with 10 kΩ end-to-end resistance per channel, I²C interface (up to 3.4 MHz), WiperLock™ technology, and extended temperature operation from –40°C to +125°C - used for precision gain/offset trimming in industrial sensor signal conditioning circuits.
For engineers reviewing the MCP4661T-103E/ST datasheet, MCP4661T-103E/ST pinout, MCP4661T-103E/ST application, or MCP4661T-103E/ST equivalent, key selection criteria include dual-potentiometer topology, EEPROM wiper retention, 75 Ω typical wiper resistance, ratiometric tempco of 15 ppm/°C, and hardware/software write protection support.
Technical Context
The MCP4661T-103E/ST integrates two independent 257-step resistor networks with volatile and nonvolatile wiper registers, enabling simultaneous or independent adjustment of two analog paths. Its I²C interface supports Standard (100 kHz), Fast (400 kHz), and High-Speed (3.4 MHz) modes with Schmitt-triggered inputs and high-voltage tolerant pins (up to 12.5 V).
WiperLock™ technology secures calibration settings in EEPROM via high-voltage activation on HVC/A0, while the Terminal Control (TCON) register allows dynamic disconnection of resistor terminals A/W/B. Brown-out reset at ~1.5 V ensures reliable power-up behavior across the 2.7–5.5 V operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resistor Network | Dual potentiometer (2 × RAB), 8-bit resolution (257 steps) |
| RAB Resistance | 10 kΩ ±20% - sets full-scale analog attenuation/gain range |
| Wiper Resistance | 75 Ω typical - minimizes insertion loss and signal distortion at wiper node |
| Ratiometric Tempco | 15 ppm/°C typical (0°C to 70°C) - ensures stable voltage-divider ratio over temperature |
| I²C Speed Support | Up to 3.4 MHz - enables fast calibration updates in real-time control loops |
| Nonvolatile Memory | 10 general-purpose EEPROM locations + wiper storage - retains settings after power cycle |
| Operating Voltage | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V logic/system rails |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial environments |
Pinout & Package
TSSOP-14 package (4.4 mm × 5.0 mm, 0.65 mm pitch) with exposed thermal pad; pin 1 marked by dot or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A2) | I²C address bit 2 | Configures device I²C slave address (A2/A1/HVC-A0) |
| 2 (A1) | I²C address bit 1 | Combines with A2 and HVC/A0 for up to 8 unique addresses |
| 3 (WP) | Hardware write protect | Active-low pin disabling EEPROM and wiper writes when asserted |
| 4 (VDD) | Positive supply | 2.7–5.5 V analog/digital power rail; powers internal logic and resistor network |
| 5 (P0W) | Potentiometer 0 wiper | Analog output node for first pot; connects internally to RAB0 tap point |
| 6 (P0B) | Potentiometer 0 terminal B | Low-side resistor endpoint for channel 0; referenced to VSS in pot mode |
| 7 (P0A) | Potentiometer 0 terminal A | High-side resistor endpoint for channel 0; referenced to VDD in pot mode |
| 8 (P1A) | Potentiometer 1 terminal A | High-side resistor endpoint for channel 1 |
| 9 (P1W) | Potentiometer 1 wiper | Analog output node for second pot; independent control from P0W |
| 10 (P1B) | Potentiometer 1 terminal B | Low-side resistor endpoint for channel 1 |
| 11 (VSS) | Ground reference | Analog and digital common return; must be low-impedance for noise immunity |
| 12 (HVC/A0) | I²C address bit 0 / WiperLock enable | Address input or 8.5–12.5 V trigger for WiperLock programming mode |
| 13 (SDA) | I²C bidirectional data | Open-drain, Schmitt-triggered, 12.5 V tolerant; requires external pull-up |
| 14 (SCL) | I²C clock input | Input-only, Schmitt-triggered, 12.5 V tolerant; synchronizes data transfers |
Key Features
| Feature | Design Value |
|---|---|
| WiperLock™ Technology | EEPROM-locked wiper settings prevent accidental or malicious modification during field operation |
| Terminal Disconnect (TCON) | Software-controllable isolation of PxA/PxW/PxB nodes eliminates leakage paths in standby or fault states |
| Dual Independent Potentiometers | Two fully separate 10 kΩ, 257-step networks enable stereo audio, dual-sensor biasing, or differential gain control |
| High-Voltage Tolerant I/O | SDA/SCL/HVC/A0/A1/A2 withstand 12.5 V - simplifies level-shifting in mixed-voltage systems |
| Brown-Out Reset (BOR) | ~1.5 V threshold ensures deterministic initialization and prevents undefined wiper states during power ramp |
| 10-Location General EEPROM | Nonvolatile storage for system calibration coefficients, serial numbers, or configuration flags beyond wiper values |
Applications
| Industrial Sensor Calibration | Programmable Gain Amplifier |
|---|---|
Use Scenario: Trimming offset and gain in 4–20 mA current-loop transmitters with RTD or strain-gauge front-ends. IC Role / Device Role: Dual-potentiometer providing independent zero and span adjustment in analog signal path. Use Value: Nonvolatile wiper retention maintains calibrated output across power cycles; 15 ppm/°C ratiometric tempco ensures <±0.1% full-scale drift over –40°C to +85°C. |
Use Scenario: Setting closed-loop gain in instrumentation amplifiers for variable-range data acquisition systems. IC Role / Device Role: Digitally controlled feedback resistor network defining amplifier gain (G = 1 + Rf/Rin). Use Value: 8-bit resolution enables 0.4% gain step size at 10 kΩ; 3.4 MHz I²C allows real-time gain switching in <30 µs. |
| Automotive Cabin Climate Control | Medical Infusion Pump Feedback |
Use Scenario: Adjusting thermistor-based temperature setpoint and blower motor speed reference in HVAC control modules. IC Role / Device Role: Dual potentiometer configuring two independent voltage dividers for temperature sensing and PWM reference generation. Use Value: –40°C to +125°C rating meets AEC-Q100 Grade 2 requirements; hardware WP pin prevents firmware-induced calibration corruption. |
Use Scenario: Calibrating pressure sensor zero and full-scale output in Class II medical infusion pumps requiring traceable calibration logs. IC Role / Device Role: Nonvolatile trim element storing factory and field calibration constants in EEPROM with WiperLock protection. Use Value: 1M-cycle EEPROM endurance supports >10 years of recalibration events; TCON register disables terminals during pump self-test sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP4661T-103E/MS | Same electrical specs; MSOP-10 package (3 × 3 mm) with no exposed pad | Limited PCB space; lower thermal dissipation capability | Select for compact layouts where TSSOP-14 footprint is unavailable |
| AD5232BRUZ10 | 10 kΩ dual-channel, 256-step, SPI interface, 2.7–5.5 V, –40°C to +105°C | No WiperLock; SPI instead of I²C; narrower temp range; no terminal disconnect | Choose when existing design uses SPI bus or requires guaranteed 105°C max ambient (not extended 125°C) |
Compared with MCP4661T-103E/ST, the MSOP variant offers identical functionality in a smaller footprint but reduced thermal performance, while the AD5232 provides SPI compatibility and proven reliability in legacy medical designs but lacks WiperLock security and extended temperature qualification.
Availability
MCP4661T-103E/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifier design, and automotive climate control systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MCP4661T-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 Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP46XX family delivers nonvolatile, I²C-compatible digital potentiometers optimized for precision analog trimming in harsh-environment applications including industrial automation, automotive subsystems, and medical instrumentation.
FAQ
What is the maximum I²C clock frequency supported by the MCP4661T-103E/ST?
The MCP4661T-103E/ST supports I²C operation up to 3.4 MHz in High-Speed mode (with Cb ≤ 100 pF and VDD ≥ 4.5 V). At 400 kHz (Fast Mode), it operates across the full 2.7–5.5 V supply range. This enables rapid wiper updates in time-critical calibration routines without CPU intervention.
Does the MCP4661T-103E/ST retain its wiper setting after power removal?
Yes, the MCP4661T-103E/ST automatically stores the last wiper position in nonvolatile EEPROM upon power-down or explicit write command. The device recalls this value at power-up, ensuring repeatable analog behavior across cycles - a core feature confirmed in the DS22107B datasheet for all MCP466X devices.
How does WiperLock™ technology function on the MCP4661T-103E/ST?
WiperLock™ on the MCP4661T-103E/ST is activated by applying 8.5–12.5 V to the HVC/A0 pin, which places the device into a secure programming mode. Once enabled, wiper and EEPROM writes are blocked until the lock is explicitly cleared using the same high-voltage sequence - preventing unauthorized calibration changes in deployed systems.
What is the wiper resistance specification for the MCP4661T-103E/ST at 2.7 V supply?
At VDD = 2.7 V and IW = 2.0 mA, the MCP4661T-103E/ST exhibits a wiper resistance of 75 Ω (typical) to 300 Ω (max), as specified in DS22107B page 5. This low on-resistance minimizes signal attenuation and THD in precision analog paths, especially critical in low-voltage sensor interfaces.
Can the MCP4661T-103E/ST be used as a rheostat, and how is that configured?
Yes - the MCP4661T-103E/ST supports rheostat operation by floating either terminal A or B of each potentiometer (e.g., leaving P0A unconnected and using P0W–P0B only). The datasheet confirms this configuration is valid for both channels, enabling variable resistance applications such as LED current control or bias adjustment without external components.
MCP4661T-103E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- 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:
- 14-TSSOP
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 75
MCP4661T-103E/ST FAQ
1.How can I place an order for MCP4661T-103E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP4661T-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 MCP4661T-103E/ST reliable?
The price and inventory of MCP4661T-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 MCP4661T-103E/ST is usually 5 days.
3.What payment methods are accepted for MCP4661T-103E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP4661T-103E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP4661T-103E/ST?
MCP4661T-103E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP4661T-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 MCP4661T-103E/ST?
For technical support, including MCP4661T-103E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP4661T-103E/ST requirements.
6.How does Aetrix verify that MCP4661T-103E/ST is sourced from the original manufacturer or authorized distributors?
All MCP4661T-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 MCP4661T-103E/ST meets industry standards.
7.What is the process for return or replacement of MCP4661T-103E/ST?
All MCP4661T-103E/ST units undergo pre-shipment inspection (PSI). If there is an issue with MCP4661T-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 MCP4661T-103E/ST part is unused and in its original packaging.
Return procedure for MCP4661T-103E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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