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Microchip Technology MCP4661T-503E/ST
- Part No.:
- MCP4661T-503E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Digital Potentiometers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MCP4661T-503E/ST.pdf
- Description:
- IC DGT POT 50KOHM 257TAP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,125
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Product details
Overview
MCP4661T-503E/ST from Microchip Technology is a dual-channel, 8-bit nonvolatile digital potentiometer in TSSOP-14 package, featuring 50 kΩ end-to-end resistance per channel, I²C interface (up to 3.4 MHz), WiperLock™ technology, and EEPROM wiper storage. It operates from 2.7V to 5.5V across –40°C to +125°C and is used for precision gain/offset trimming in industrial sensor signal conditioning circuits.
For engineers reviewing the MCP4661T-503E/ST datasheet, MCP4661T-503E/ST pinout, MCP4661T-503E/ST application, or MCP4661T-503E/ST equivalent, key selection criteria include dual-potentiometer topology with independent wiper control, 257-step resolution, 15 ppm ratiometric tempco, terminal disconnect capability via TCON register, and hardware/software write protection.
Technical Context
The MCP4661T-503E/ST integrates two independent 8-bit resistor networks (P0 and P1), each configurable as potentiometer or rheostat, with volatile and nonvolatile wiper registers. Its I²C interface supports Standard (100 kHz), Fast (400 kHz), and High-Speed (3.4 MHz) modes, enabling rapid calibration updates without host processor interruption.
WiperLock™ technology secures factory or field-calibrated settings in EEPROM, while the Terminal Control (TCON) register allows dynamic disconnection of A/W/B terminals to eliminate leakage paths. Brown-out reset (1.5 V typical) ensures reliable power-up behavior across wide temperature and supply ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resistance per channel | 50 kΩ ±20% - defines full-scale analog range for gain/attenuation control |
| Resolution | 8-bit / 257 steps - enables fine-grained adjustment with no missing codes |
| Ratiometric tempco | 15 ppm/°C (typ.) - ensures stable voltage-divider ratio over temperature |
| I²C speed support | Up to 3.4 MHz - allows sub-10 µs wiper updates for real-time calibration |
| Wiper resistance | 75 Ω (typ.) - minimizes insertion error in low-impedance feedback paths |
| Operating voltage | 2.7V to 5.5V - compatible with standard logic and analog supply rails |
| Temperature range | –40°C to +125°C - qualified for under-hood, industrial, and motor-control environments |
Pinout & Package
TSSOP-14 package (4.4 mm × 5.0 mm, 0.65 mm pitch) with exposed thermal pad; RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A2) | I²C address bit 2 | Configures device address (0x2C–0x2F) in multi-drop bus systems |
| 2 (A1) | I²C address bit 1 | Combines with A2 and A0 to select one of four unique I²C addresses |
| 3 (WP) | Hardware write protect | Active-low pin disabling all EEPROM and wiper writes when asserted |
| 4 (VDD) | Positive supply | 2.7V–5.5V analog/digital rail; powers internal logic and resistor networks |
| 5 (P0W) | Potentiometer 0 wiper | Midpoint tap of first 50 kΩ network; connects to op-amp feedback or reference node |
| 6 (P0B) | Potentiometer 0 terminal B | Low-side terminal of first network; often grounded or connected to reference |
| 7 (P0A) | Potentiometer 0 terminal A | High-side terminal of first network; connects to signal source or VDD |
| 8 (P1A) | Potentiometer 1 terminal A | High-side terminal of second 50 kΩ network; enables dual-path configuration |
| 9 (P1W) | Potentiometer 1 wiper | Independent adjustable tap for second channel; supports differential or dual-loop control |
| 10 (P1B) | Potentiometer 1 terminal B | Low-side terminal of second network; supports isolated biasing or termination |
| 11 (VSS) | Ground | Analog/digital common reference; requires low-impedance connection to minimize noise |
| 12 (HVC/A0) | I²C address bit 0 / high-voltage control | Selects I²C address or enables WiperLock™ via 8.5–12.5 V pulse |
| 13 (SDA) | I²C data line | Open-drain bidirectional bus line; supports multi-master arbitration and clock stretching |
| 14 (SCL) | I²C clock line | Master-generated clock; synchronizes all read/write operations to wiper and EEPROM |
Key Features
| Feature | Design Value |
|---|---|
| Nonvolatile wiper storage | Automatically recalls last calibrated setting after power cycle-eliminates boot-time reinitialization |
| WiperLock™ technology | Prevents accidental or malicious EEPROM overwrite using high-voltage programming sequence |
| Terminal disconnect (TCON) | Software-controlled isolation of PxA/PxW/PxB terminals-removes leakage paths during sleep or fault states |
| Dual independent channels | Separate 257-step wiper registers for P0 and P1-enables simultaneous but uncorrelated gain/offset tuning |
| 10 general-purpose EEPROM locations | Stores calibration coefficients, serial numbers, or system-specific parameters beyond wiper values |
| High-voltage tolerant inputs | HVC/A0, A1, A2, SDA, SCL tolerate up to 12.5 V-allows direct interfacing with 5 V or 12 V control logic |
Applications
| Industrial Sensor Calibration | Programmable Gain Amplifier |
|---|---|
Use Scenario: Factory-trimmed load cell or RTD signal conditioning circuit requiring long-term stability across temperature cycles. IC Role / Device Role / Timing Role: Dual-potentiometer providing zero-offset and span adjustment in instrumentation amplifier feedback network. Use Value: 15 ppm ratiometric tempco maintains bridge balance accuracy; nonvolatile storage preserves calibration across power loss. |
Use Scenario: Configurable gain stage in programmable logic controller (PLC) analog input module supporting multiple sensor types. IC Role / Device Role / Timing Role: Digitally controlled feedback resistor in op-amp-based PGA architecture. Use Value: 257-step resolution enables precise gain selection (e.g., 0.1× to 100×); I²C interface allows host MCU to update gain on-the-fly. |
| Motor Drive Current Sensing | Power Supply Trim & Margining |
Use Scenario: Isolated shunt-based current sensing in BLDC motor inverter, where offset drift must be compensated dynamically. IC Role / Device Role / Timing Role: Rheostat-mode potentiometer in offset nulling path of isolated amplifier. Use Value: 75 Ω wiper resistance minimizes error contribution; terminal disconnect prevents leakage into high-impedance sense nodes. |
Use Scenario: Precision margining of 3.3 V or 5 V DC-DC output in telecom power shelf with remote calibration capability. IC Role / Device Role / Timing Role: Potentiometer adjusting feedback divider ratio of voltage-mode controller. Use Value: 50 kΩ resistance value matches typical feedback network impedance; EEPROM retention ensures trim survives firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5232BRUZ100 | 100 kΩ RAB, SPI interface, ±30% resistance tolerance, no HVC pin | Requires SPI host; higher resistance tolerance increases gain error in precision amplifiers | Choose when SPI is preferred and 100 kΩ range better matches existing feedback network design |
| MCP4651T-503E/ST | Volatile-only wiper memory, same pinout/package, identical RAB and resolution | Loses nonvolatile recall-requires host MCU to reload wiper at startup | Choose when calibration is performed at every power-on and EEPROM endurance is not required |
Compared with MCP4661T-503E/ST, AD5232BRUZ100 offers SPI compatibility but lacks WiperLock™ and high-voltage programming; MCP4651T-503E/ST provides identical analog performance but sacrifices persistent calibration, increasing system-level initialization complexity.
Availability
MCP4661T-503E/ST is available at Aetrix Electronics and suitable for industrial automation, motor control, and precision power supply applications requiring stable component supply, long-term calibration retention, and extended temperature operation.
Supply support for MCP4661T-503E/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 microcontroller, mixed-signal, analog, 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 environments-designed specifically for industrial, automotive, and medical systems demanding reliability and long-term calibration stability.
FAQ
What is the maximum I²C clock frequency supported by the MCP4661T-503E/ST?
The MCP4661T-503E/ST supports I²C clock frequencies 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 down to 2.7 V VDD, and at 100 kHz (Standard mode), it functions from 1.8 V to 5.5 V-ensuring flexibility across diverse host controller platforms. The MCP4661T-503E/ST's timing compliance is verified per I²C specification across all modes.
Does the MCP4661T-503E/ST retain its wiper setting after power removal?
Yes, the MCP4661T-503E/ST retains its wiper setting in nonvolatile EEPROM memory and automatically restores it on power-up. This feature eliminates the need for host MCU initialization code to reload calibration values. The MCP4661T-503E/ST guarantees 1 million EEPROM write cycles and data retention exceeding 200 years at +25°C, making it suitable for maintenance-free industrial deployments.
How does WiperLock™ technology work on the MCP4661T-503E/ST?
WiperLock™ on the MCP4661T-503E/ST prevents unauthorized or accidental modification of EEPROM-stored wiper values by requiring a high-voltage pulse (8.5–12.5 V) on the HVC/A0 pin to enter programming mode. Once locked, only another valid high-voltage sequence can unlock it-providing hardware-level security against firmware bugs or malicious writes. The MCP4661T-503E/ST implements this without external components.
Can both potentiometer channels of the MCP4661T-503E/ST be configured independently?
Yes, the MCP4661T-503E/ST provides fully independent control of Potentiometer 0 (P0A/P0W/P0B) and Potentiometer 1 (P1A/P1W/P1B) via separate wiper registers and TCON bits. Each channel supports individual terminal disconnect, distinct I²C commands, and independent EEPROM storage-enabling asymmetric configurations such as one channel as potentiometer and the other as rheostat within the same device.
What is the typical wiper resistance of the MCP4661T-503E/ST and why does it matter?
The MCP4661T-503E/ST has a typical wiper resistance of 75 Ω at VDD = 5.5 V and IW = 2.0 mA. This low value minimizes insertion error in precision feedback networks-especially critical in low-gain or high-accuracy op-amp configurations where even tens of ohms can introduce measurable offset or gain deviation. The MCP4661T-503E/ST's wiper resistance remains stable across temperature and supply voltage.
MCP4661T-503E/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):
- 50k
- 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-503E/ST FAQ
1.How can I place an order for MCP4661T-503E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP4661T-503E/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-503E/ST reliable?
The price and inventory of MCP4661T-503E/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-503E/ST is usually 5 days.
3.What payment methods are accepted for MCP4661T-503E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP4661T-503E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP4661T-503E/ST?
MCP4661T-503E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP4661T-503E/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-503E/ST?
For technical support, including MCP4661T-503E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP4661T-503E/ST requirements.
6.How does Aetrix verify that MCP4661T-503E/ST is sourced from the original manufacturer or authorized distributors?
All MCP4661T-503E/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-503E/ST meets industry standards.
7.What is the process for return or replacement of MCP4661T-503E/ST?
All MCP4661T-503E/ST units undergo pre-shipment inspection (PSI). If there is an issue with MCP4661T-503E/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-503E/ST part is unused and in its original packaging.
Return procedure for MCP4661T-503E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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