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Microchip Technology MCP4661T-104E/ST
- Part No.:
- MCP4661T-104E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Digital Potentiometers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MCP4661T-104E/ST.pdf
- Description:
- IC DGT POT 100KOHM 257TP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,355
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Product details
Overview
MCP4661T-104E/ST from Microchip Technology is a dual-channel, 8-bit nonvolatile digital potentiometer in TSSOP-14 package with 100 kΩ end-to-end resistance per channel, I²C interface (up to 3.4 MHz), WiperLock™ technology, and operation from 2.7V to 5.5V. It enables precision analog trimming in programmable gain amplifiers and sensor calibration circuits.
For engineers reviewing the MCP4661T-104E/ST datasheet, MCP4661T-104E/ST pinout, MCP4661T-104E/ST application, or MCP4661T-104E/ST equivalent, key selection criteria include dual-potentiometer topology, EEPROM wiper recall, 100 kΩ RAB value, ±0.5 LSB DNL, and TSSOP-14 thermal performance for industrial temperature range (-40°C to +125°C) designs.
Technical Context
The MCP4661T-104E/ST implements two independent 257-step resistor networks with potentiometer configuration (P0A/P0W/P0B and P1A/P1W/P1B), each retaining wiper position in nonvolatile memory after power cycle. Its I²C interface supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes with hardware write-protect (WP pin) and software-configurable write protection.
WiperLock™ technology secures calibrated settings via high-voltage programming of the HVC/A0 pin, while the Terminal Control (TCON) register allows dynamic disconnection of resistor terminals. Brown-out reset activates below 1.65 V, ensuring reliable initialization across supply transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RAB per channel | 100 kΩ ±20% - defines full-scale resistance between A and B terminals for gain/attenuation scaling |
| Resolution | 8-bit (257 steps) - provides 0.39% step resolution for fine analog control |
| Wiper resistance | 75 Ω typical - minimizes signal path degradation in low-impedance circuits |
| Tempco (ratiometric) | 15 ppm/°C typical - ensures stable voltage-divider ratio over -40°C to +125°C |
| I²C speed support | Up to 3.4 MHz - enables rapid wiper updates in real-time closed-loop systems |
| Nonvolatile memory | 10 GP locations + wiper storage - retains calibration without external EEPROM |
| Operating voltage | 2.7V to 5.5V - compatible with 3.3V and 5V logic/system rails |
Pinout & Package
TSSOP-14 package with exposed thermal pad (EP), 5.0 mm × 4.4 mm footprint, 0.65 mm pitch, rated for 1.00 W power dissipation at TA = +50°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A2) | I²C address bit | Configures device address (0x2C–0x2F) when pulled high/low with A1/A0 |
| 2 (A1) | I²C address bit | Second address bit; combined with A2 and A0 to select one of four I²C addresses |
| 3 (WP) | Hardware write protect | Active-low pin disabling all EEPROM and wiper writes when asserted |
| 4 (VDD) | Power supply | 2.7V–5.5V analog/digital supply; powers internal logic and resistor networks |
| 5 (P0W) | Channel 0 wiper | Variable tap point for first potentiometer; connects to internal resistor ladder |
| 6 (P0B) | Channel 0 terminal B | Fixed end of first resistor network; used as ground reference or low-side connection |
| 7 (P0A) | Channel 0 terminal A | Fixed end of first resistor network; used as VDD reference or high-side connection |
| 8 (P1A) | Channel 1 terminal A | Fixed end of second resistor network; enables dual independent voltage dividers |
| 9 (P1W) | Channel 1 wiper | Variable tap point for second potentiometer; supports simultaneous dual-channel control |
| 10 (P1B) | Channel 1 terminal B | Fixed end of second resistor network; isolated from P0B for independent biasing |
| 11 (VSS) | Ground | Analog/digital common reference; must be low-impedance for noise-sensitive applications |
| 12 (HVC/A0) | High-voltage control / address | Enables WiperLock™ programming at ≥8.5 V; also serves as third I²C address bit |
| 13 (SDA) | I²C data | Open-drain bidirectional bus line; requires external pull-up to VDD |
| 14 (SCL) | I²C clock | Input-only clock line; synchronizes all read/write transactions |
Key Features
| Feature | Design Value |
|---|---|
| Nonvolatile wiper recall | Automatically restores last stored wiper position on power-up, eliminating boot-time calibration |
| WiperLock™ technology | Prevents accidental or malicious wiper changes via 8.5–12.5 V programming pulse on HVC/A0 |
| Dual independent potentiometers | Enables matched gain/offset adjustment in differential amplifiers or stereo audio paths |
| Terminal disconnect (TCON) | Software-controlled isolation of PxA/PxW/PxB terminals to eliminate leakage in standby mode |
| Extended temperature range | Guaranteed operation from -40°C to +125°C for under-hood automotive or industrial motor control |
Applications
| Programmable Gain Amplifier | Sensor Calibration |
|---|---|
Use Scenario: Adjusting feedback resistor ratio in instrumentation amplifier to switch between 1×, 10×, and 100× gain modes. IC Role / Device Role / Timing Role: Dual potentiometer providing matched R1/R2 ratio control for precise gain setting. Use Value: Eliminates manual trimmer replacement; maintains gain accuracy across temperature with 15 ppm/°C ratiometric tempco. | Use Scenario: Compensating offset and span errors in pressure transducer output before ADC sampling. IC Role / Device Role / Timing Role: Two independent potentiometers calibrating zero-point (P0) and full-scale (P1) voltage references. Use Value: Stores calibration coefficients in EEPROM, enabling field recalibration without firmware update. |
| Motor Current Sensing | Industrial DAC Output Scaling |
Use Scenario: Scaling shunt voltage in high-side current sensing to match ADC input range during PWM switching. IC Role / Device Role / Timing Role: Single-channel potentiometer (P0) acting as programmable attenuator for dynamic range adaptation. Use Value: 3.4 MHz I²C allows real-time attenuation updates synchronized to motor commutation events. | Use Scenario: Adjusting output swing of a 12-bit DAC to drive 0–5 V or 0–10 V actuator inputs in PLC modules. IC Role / Device Role / Timing Role: Dual potentiometer (P0 for offset, P1 for gain) performing post-DAC linear scaling. Use Value: Nonvolatile storage preserves user-defined scaling factors across power cycles and firmware upgrades. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5242BRUZ100 | Single-channel, 256-step, I²C, 100 kΩ, volatile memory only | Lacks EEPROM recall and WiperLock™; requires external microcontroller to restore settings | Select when cost sensitivity outweighs nonvolatile requirement and single-channel suffices |
| MCP4651T-104E/ST | Dual-channel, 256-step, I²C, 100 kΩ, volatile RAM wiper only (no EEPROM) | No automatic power-on recall; wiper resets to mid-scale (0x80) unless reprogrammed | Choose for lower-cost dual-pot applications where calibration persistence is handled externally |
Compared with AD5242BRUZ100 and MCP4651T-104E/ST, the MCP4661T-104E/ST uniquely delivers dual-channel 8-bit nonvolatile wiper storage, WiperLock™ security, and guaranteed -40°C to +125°C operation-making it optimal for unattended industrial calibration and safety-critical trimming.
Availability
MCP4661T-104E/ST is available at Aetrix Electronics and suitable for programmable gain amplifiers, sensor calibration systems, motor current sensing circuits, and industrial DAC output scaling requiring stable component supply across extended temperature ranges.
Supply support for MCP4661T-104E/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.
The MCP46XX family targets precision analog trimming in harsh environments, delivering nonvolatile digital potentiometers with industrial-grade reliability, EEPROM-based calibration retention, and robust I²C communication for embedded control systems.
FAQ
What is the maximum I²C clock frequency supported by the MCP4661T-104E/ST?
The MCP4661T-104E/ST supports I²C up to 3.4 MHz in high-speed mode (with 100 pF bus capacitance and VDD ≥ 4.5 V). At 400 kHz (fast mode) and 100 kHz (standard mode), it operates across the full 2.7V–5.5V supply range. The MCP4661T-104E/ST datasheet specifies timing parameters including TSU:STA (160 ns min at 3.4 MHz) and THD:STO (160 ns min), confirming robust high-speed interface compliance.
Does the MCP4661T-104E/ST retain its wiper setting after power loss?
Yes, the MCP4661T-104E/ST stores wiper positions in nonvolatile EEPROM memory and automatically recalls them on power-up. This behavior is enabled by default and does not require external circuitry. The MCP4661T-104E/ST also provides 10 general-purpose EEPROM locations for user calibration data, making it ideal for field-programmable analog systems.
How does WiperLock™ technology function on the MCP4661T-104E/ST?
WiperLock™ prevents unauthorized or accidental wiper changes by requiring an 8.5–12.5 V pulse on the HVC/A0 pin to enter programming mode. Once locked, wiper writes are disabled until the high-voltage pulse is reapplied. This feature is confirmed in the MCP4661T-104E/ST datasheet (DS22107B, Section 1.11) and applies independently to both channels.
What is the wiper resistance specification for the MCP4661T-104E/ST at 2.7V supply?
At VDD = 2.7 V and wiper current IW = 2.0 mA, the MCP4661T-104E/ST exhibits a typical wiper resistance (RW) of 75 Ω, with a maximum of 300 Ω across temperature. This low on-resistance minimizes insertion loss in signal-path applications and is measured at code 0x00 per DS22107B-page 5.
Can the MCP4661T-104E/ST operate reliably at 125°C ambient temperature?
Yes, the MCP4661T-104E/ST is fully specified for operation from -40°C to +125°C ambient temperature, with all electrical characteristics (including RAB tolerance, tempco, and I²C timing) validated across this range. Its TSSOP-14 package with exposed thermal pad supports 1.00 W dissipation at TA = +50°C, enabling sustained use in high-temperature industrial enclosures.
MCP4661T-104E/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):
- 100k
- 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-104E/ST FAQ
1.How can I place an order for MCP4661T-104E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP4661T-104E/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-104E/ST reliable?
The price and inventory of MCP4661T-104E/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-104E/ST is usually 5 days.
3.What payment methods are accepted for MCP4661T-104E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP4661T-104E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP4661T-104E/ST?
MCP4661T-104E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP4661T-104E/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-104E/ST?
For technical support, including MCP4661T-104E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP4661T-104E/ST requirements.
6.How does Aetrix verify that MCP4661T-104E/ST is sourced from the original manufacturer or authorized distributors?
All MCP4661T-104E/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-104E/ST meets industry standards.
7.What is the process for return or replacement of MCP4661T-104E/ST?
All MCP4661T-104E/ST units undergo pre-shipment inspection (PSI). If there is an issue with MCP4661T-104E/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-104E/ST part is unused and in its original packaging.
Return procedure for MCP4661T-104E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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