MCP4651T-103E/ST - Dual 10kΩ 8-bit I2C Digital Pot | Microchip
Teilenummer: MCP4651T-103E/ST ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $1.75 | $1,75 |
| 10 | $1.58 | $15,80 |
| 100 | $1.32 | $132,00 |
| 500 | $1.05 | $525,00 |
| 1.000 | $0.88 | $880,00 |
| 2.500 | $0.74 | $1.850,00 |
MCP4651T-103E/ST Übersicht
A digital potentiometer (often called a "digipot") is a solid-state, digitally-controlled variable resistor that emulates a mechanical potentiometer or rheostat through an array of resistor elements switched by on-board CMOS transmission gates. In the broader signal-conditioning hierarchy, a digipot belongs to the data-acquisition family -> digital potentiometers -> variable resistors -> passive signal-control components. Compared to mechanical trimmers, digipots offer remote or automated adjustment, immunity to shock and vibration, and integration with microcontroller I2C buses, which makes them essential for factory-trimmed, software-calibrated, or adaptive-equalization designs.
Key features of the MCP4651T-103E/ST include 257 wiper positions (8-bit, 0.39% step), an R<sub>AB</sub> end-to-end resistance of 10 kΩ, two independent potentiometer channels, a fast-mode (400 kHz) I2C-compatible serial interface, a wide single-supply voltage range of 2.7 V to 5.5 V, a low quiescent current of approximately 2.5 µA, and a wiper resistance (R<sub>W</sub>) of only 75 Ω. The part is also AEC-Q100 qualified, making it suitable for automotive-grade applications including dash-cluster and engine-bay modules.
Internally the device uses a resistor ladder of 256 series elements with CMOS transmission-gate wiper switches; the wiper terminal (W) taps any of 257 nodes between the R-terminals. Because settings are volatile, the host MCU must rewrite the wiper value after each power-up, and the I2C address is hardware-fixed via the AD0 pin. This architecture gives ±1 LSB INL/DNL over most of the resistor range and a temperature coefficient of resistance of about ±50 ppm/°C typical, enabling stable analog behaviour over industrial and automotive temperature ranges.
Typical applications include LCD contrast and brightness trimming, audio volume and tone control, sensor calibration and offset trimming, programmable gain and filter tuning, automotive sensor conditioning, programmable voltage-divider references, and bias-setting for op-amps and RF stages. Two channels per package also let designers trim dual-rail systems or implement stereo audio balance with a single chip.
Designers should place a 0.1 µF decoupling capacitor close to V<sub>DD</sub>, keep the I2C pull-up resistors within 1 kΩ to 10 kΩ for clean edges, and treat the wiper (W) like an analog signal trace - guarding it against adjacent digital aggressors. The volatile memory means the host must re-write the wiper position after every power cycle or POR/BOR event.
This page synthesizes current distributor pricing, drop-in cross-brand equivalents, and engineering design notes not collected in a single datasheet view, giving you the practical information needed to specify, source, and lay out the MCP4651T-103E/ST with confidence.
Drop-in-Alternativen für MCP4651T-103E/ST – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit MCP4651T-103E/ST (gleiche Bauform und Footprint) – abweichend in Interface, Number of Channels, Number of Taps, Package, Resolution.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
MCP4651T-103E/ML
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MCP4651-103E/ST
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MCP4651T-104E/ST
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MCP4651T-502E/ST
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MCP4661T-104E/ST
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MCP4651T-103E/ST Technische Daten
| Number of Channels | 2 (dual) |
| End-to-End Resistance (R_AB) | 10 kΩ |
| Number of Taps | 257 (8-bit) |
| Auflösung | 8-bit / 0.39% step |
| Schnittstelle | I2C (Fast-Mode, 400 kHz) |
| Speichertyp | Volatile (wipers reset to mid-scale at POR) |
| Supply Voltage (V_DD) | 2.7 V to 5.5 V |
| Ruhestrom | 2.5 µA (typical) |
| Wiper Resistance (R_W) | 75 Ω (typical) |
| Temperature Coefficient | ±50 ppm/°C (typical) |
| Betriebstemperatur | -40 °C to +125 °C (E - extended industrial) |
| Gehäuse | 14-pin TSSOP (ST) |
| Montageart | Surface Mount |
| Packaging | Tape & Reel (T suffix) |
| Automotive Qualification | AEC-Q100 qualified |
MCP4651T-103E/ST Pin-Konfiguration
| Pin 1 | V_DD — Positive supply voltage (2.7 V to 5.5 V) |
| Pin 2 | SCL — I2C serial clock input |
| Pin 3 | SDA — I2C serial data |
| Pin 4 | AD0 — I2C device-address sub-bit (hardware-tied low or high) |
| Pin 5 | P0A — Potentiometer 0 terminal A |
| Pin 6 | P0W — Potentiometer 0 wiper terminal |
| Pin 7 | P0B — Potentiometer 0 terminal B |
| Pin 8 | GND — Ground reference |
| Pin 9 | P1B — Potentiometer 1 terminal B |
| Pin 10 | P1W — Potentiometer 1 wiper terminal |
| Pin 11 | P1A — Potentiometer 1 terminal A |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | WP — Write-protect (active-low; tie high to enable writes) |
| Pin 14 | A0 — I2C device-address sub-bit A0 (combined with AD0) |
Typische Anwendungen
MCP4651T-103E/ST ist geeignet für 6 Anwendungs: LCD Contrast & Backlight Brightness Trimming, Audio Volume and Balance Control, Sensor Calibration and Offset Trimming, Automotive Sensor Signal Conditioning, Programmable Gain Amplifier Tuning, Programmable Voltage-Divider References.
LCD Contrast & Backlight Brightness Trimming
The MCP4651T-103E/ST is well-suited for LCD contrast and backlight brightness trimming in industrial HMIs and automotive clusters. Its 10 kΩ end-to-end resistance and 257-tap resolution let designers set the V_CON pin of character or TFT LCDs with ~0.4% step granularity from a host MCU over I2C. Channel 0 typically drives the contrast divider, while channel 1 sets LED-backlight current via a driver feedback network. AEC-Q100 qualification makes the part valid for in-cabin display modules.
Empfohlen
Audio Volume and Balance Control
For stereo audio volume and balance, the MCP4651T-103E/ST dual 10 kΩ channels map cleanly to left/right signal paths with one I2C address. The 75 Ω typical wiper resistance is low enough to avoid loading line-level stages, and 257 taps over 8-bit resolution allow fine tuning when paired with a software log taper (~0.4 dB per step). The volatile memory means the host MCU must re-write settings after each power-up, which is straightforward when the MCU also controls the audio source.
Empfohlen
Sensor Calibration and Offset Trimming
Sensor calibration and offset trimming is a classic digipot use case where the MCP4651T-103E/ST shines. The 10 kΩ end-to-end resistance sits comfortably in the middle of most Wheatstone-bridge impedances, allowing one wiper to null the bridge offset while the second channel trims gain. I2C control permits automated factory calibration routines without manual trimmers, eliminating mechanical vibration sensitivity and drift. The -40 °C to +125 °C extended industrial range covers automotive and outdoor-Industrial deployments.
Empfohlen
Automotive Sensor Signal Conditioning
The MCP4651T-103E/ST is AEC-Q100 qualified, making it appropriate for automotive sensor signal conditioning in modules such as throttle-position sensors, MAP sensors, and HVAC controls. The two channels can independently trim the offset and gain of an instrumentation-amp front-end feeding an automotive ADC, with calibration constants held in the host ECU. I2C isolation can be added with a dedicated bus driver for OBD-II or CAN-bus-attached modules.
Empfohlen
Programmable Gain Amplifier Tuning
The MCP4651T-103E/ST enables programmable gain amplifier (PGA) tuning in test-and-measurement front-ends. Replacing a fixed feedback resistor with the digipot's R_W-to-R_B resistance allows the host MCU to step gain over a wide range in 0.39% increments. The 10 kΩ nominal value pairs well with most low-noise op-amp feedback networks, and the low 2.5 µA quiescent current adds negligible offset error. AEC-Q100 also permits its use in automotive test equipment.
Empfohlen
Programmable Voltage-Divider References
The MCP4651T-103E/ST serves as a programmable voltage-divider reference, providing any tap voltage from 0 V to V_DD in 257 steps. With a stable 5 V reference on V_DD, the wiper can deliver a software-adjustable voltage between 0 V and 5 V suitable for ADC full-scale calibration, DAC reference trim, or threshold-setting comparators. The dual-channel package enables simultaneous coarse and fine adjustment in a single footprint.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MCP4651T-103E/ST – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MCP4651T-103E/ML | MCP4651-103E/ST | MCP4651T-104E/ST | MCP4651T-502E/ST | MCP4661T-104E/ST |
|---|---|---|---|---|---|---|
| Package | 14-pin TSSOP (ST) | 16-pin QFN (ML) - different footprint | 14-pin TSSOP (ST) - identical | 14-pin TSSOP (ST) - identical | 14-pin TSSOP (ST) - identical | 14-pin TSSOP (ST) - identical |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| End-to-End Resistance | 10 kΩ | 10 kΩ | 10 kΩ | 100 kΩ | 50 kΩ | 100 kΩ |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 |
| Number of Taps | 257 (8-bit) | 257 (8-bit) | 257 (8-bit) | 257 (8-bit) | 257 (8-bit) | 257 (8-bit) |
| Memory Type | Volatile | Volatile | Volatile | Volatile | Volatile | Non-volatile (EEPROM) |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Interface | I2C (400 kHz) | I2C (400 kHz) | I2C (400 kHz) | I2C (400 kHz) | I2C (400 kHz) | I2C (400 kHz) |
| Wiper Resistance (typical) | 75 Ω | 75 Ω | 75 Ω | 75 Ω | 75 Ω | 75 Ω |
Wichtigste Unterscheidungsmerkmale
- Dual independent channels in a single 14-pin TSSOP (vs. Single-channel MCP4131 / MCP4141)
- AEC-Q100 qualification for automotive use (vs. Industrial-only competitors (e.g. AD5241 in some grades))
- Low 2.5 µA quiescent current for battery-powered designs (vs. Non-volatile MCP4661 (typically ~5 µA))
- 10 kΩ end-to-end with only 75 Ω wiper resistance (vs. 100 kΩ variants such as MCP4651T-104E/ST)
Designhinweise
Place a 0.1 µF ceramic decoupling capacitor as close as possible to the V_DD pin (pin 1), with the ground return to the nearby GND pin (pin 8). For multi-drop I2C buses longer than ~10 cm, add a 10 µF bulk tantalum or polymer cap on the same node to suppress transient drops during hot-plug events. The MCP4651T-103E/ST draws only ~2.5 µA quiescent, so power-rail design is dominated by the load current through the wiper terminal, not by the IC supply.
Because the MCP4651T-103E/ST is volatile, the wiper position resets to mid-scale at every power-up or brown-out reset. Always design the host MCU to rewrite the desired wiper value immediately after POR/BOR before any analog signal passes through the digipot, otherwise the system may operate at an unintended mid-scale gain or offset during the first few hundred milliseconds of boot. Avoid tying WP (pin 13) low unintentionally - it disables I2C writes and can lock the device in an unexpected state.
Treat the wiper terminals (P0W, P1W) and the resistor terminals (P0A/P0B, P1A/P1B) as analog signal traces. Route them away from digital aggressors such as clock lines or switching converters, and guard them with a ground pour to minimise crosstalk. Keep I2C pull-up resistors between 1 kΩ (for 400 kHz fast-mode) and 10 kΩ (for standard-mode 100 kHz); values above 10 kΩ will round off the rising edges and risk I2C bus errors on long traces.
The TSSOP-14 package has a theta_JA of approximately 100 °C/W, but the digipot dissipates negligible internal power because no current flows through the silicon at idle. Estimated: at 5 V supply and 1 mA wiper current, the device dissipates roughly 5 mW - well below any thermal concern. The limiting factor for high-wiper-current designs is the ~75 Ω wiper resistance, which causes an IR drop that the application circuit must tolerate.
Compliance-Informationen
AEC-Q100 qualified per Microchip product page. RoHS and REACH compliant. Halogen-free per Microchip environmental certification. Conflict-minerals reporting compliant under the Dodd-Frank Act.
