MCP4441-104E/ST - 100kΩ Quad 7-bit I2C Digital Pot | Microchip
부품 번호: MCP4441-104E/ST ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $2.42 | $2.42 |
| 10 | $2.18 | $21.80 |
| 100 | $1.84 | $184.00 |
| 500 | $1.52 | $760.00 |
| 1,000 | $1.31 | $1,310.00 |
MCP4441-104E/ST 개요
A digital potentiometer (digipot) is a solid-state replacement for a mechanical potentiometer, replacing a moving wiper with an electronically controlled resistor network. It belongs to the broader category of variable resistors, which sit under passive components in signal-conditioning hierarchies. Unlike mechanical trimpots, digipots offer digital control, non-volatile memory, and software-driven calibration, which makes them well suited for reconfigurable analog designs.
Key features include 75 Ω typical wiper resistance, ±20% end-to-end resistance tolerance, a low temperature coefficient, internal weak pull-ups on digital inputs (except SCL/SDA), and WiperLock technology that prevents unauthorized wiper movement. The four independent channels can be configured individually as potentiometers or rheostats, enabling gain control, offset trimming, and filter tuning in a single IC.
Architecturally, each channel is built from a resistor ladder of 128 equal resistors in series, with CMOS analog switches selecting the active tap. Wiper transitions use a make-before-break scheme to avoid momentary open-circuit glitches. The I2C slave supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes with hardware-address pins (A0, A1) for up to four devices on one bus.
Typical applications include audio volume and tone control, LCD brightness trimming, programmable gain amplifiers, sensor calibration, and industrial process-control setpoints. With non-volatile memory, the wiper position survives power-down, allowing field-deployed equipment to retain calibration without re-initialization at every startup.
When designing with this device, place 0.1 µF decoupling capacitors close to VDD and treat the wiper as a CMOS analog switch with finite on-resistance. High-impedance downstream nodes (>10 kΩ) are recommended so the 75 Ω wiper resistance does not dominate the divider ratio.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
드롭인 대체품: MCP4441-104E/ST — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: MCP4441-104E/ST (동일 폼 팩터 및 풋프린트) — 차이점: Package, Operating Temperature, Resistance Tolerance, Interface, Memory Type.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MCP4441T-104E/ST
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MCP4442-104E/ST
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MCP4441-503E/ST
✅ 드롭인✓ 재고 있음
$1.52 / 개
데이터시트 보기 →MCP4361-503E/ST
✅ 드롭인✓ 재고 있음
$1.72 / 개
데이터시트 보기 →MCP4342-503E/ST
✅ 드롭인✓ 재고 있음
$1.6 / 개
데이터시트 보기 →MCP4441-104E/ST 최대 정격 & 전기적 특성
| End-to-End Resistance | 100 kΩ |
| Resistance Tolerance | ±20% |
| Number of Channels | 4 (Quad) |
| Number of Taps | 129 (7-bit) |
| Control Interface | I2C (Serial, 2-wire) |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Wiper Resistance | 75 Ω (typical) |
| 동작 온도 | -40 °C to +125 °C |
| 메모리 유형 | Non-volatile EEPROM |
| Configuration | Potentiometer or Rheostat (per channel) |
| I2C Address Pins | A0, A1 (up to 4 devices on bus) |
| I2C Speed | Standard / Fast / High-Speed (3.4 MHz) |
| 패키지 | 20-pin TSSOP |
| 실장 유형 | Surface Mount |
| MSL 레벨 | 1 |
| RoHS 상태 | Compliant |
| Lead-Free | Yes |
| WiperLock Technology | Yes |
MCP4441-104E/ST 핀 구성
| 핀 1 | P0A — Potentiometer 0 terminal A |
| 핀 2 | P0W — Potentiometer 0 wiper |
| 핀 3 | P0B — Potentiometer 0 terminal B |
| 핀 4 | P1A — Potentiometer 1 terminal A |
| 핀 5 | P1W — Potentiometer 1 wiper |
| 핀 6 | P1B — Potentiometer 1 terminal B |
| 핀 7 | P2A — Potentiometer 2 terminal A |
| 핀 8 | P2W — Potentiometer 2 wiper |
| 핀 9 | P2B — Potentiometer 2 terminal B |
| 핀 10 | P3A — Potentiometer 3 terminal A |
| 핀 11 | SDA — I2C serial data (no internal pull-up) |
| 핀 12 | SCL — I2C serial clock (no internal pull-up) |
| 핀 13 | P3W — Potentiometer 3 wiper |
| 핀 14 | P3B — Potentiometer 3 terminal B |
| 핀 15 | NC — Not connected (per datasheet) |
| 핀 16 | WP — Write-protect (active-low, internal pull-up) |
| 핀 17 | RESET — Reset (active-low, internal pull-up) |
| 핀 18 | A1 — I2C address bit 1 (internal pull-up) |
| 핀 19 | VSS — Ground |
| 핀 20 | VDD — Positive supply voltage |
일반적인 애플리케이션
MCP4441-104E/ST 적합 용도: 6 애플리케이션s: Audio Volume and Tone Control, Programmable Gain Amplifier, LCD Contrast Trimming, Sensor Calibration and Offset Nulling, Programmable Filter Cutoff Frequency, Industrial Process-Control Setpoint.
Audio Volume and Tone Control
The MCP4441-104E/ST's 100 kΩ end-to-end resistance is well above typical 10 kΩ audio input impedances, so its 75 Ω typical wiper resistance contributes negligibly to the divider ratio and preserves THD performance. The four channels provide independent volume, bass, treble, and balance control with 7-bit (1 dB approximate) resolution. Non-volatile EEPROM means the user's last volume setting survives power-down - no click/pop on restart. Place 0.1 µF ceramic decoupling on VDD and buffer the wiper with a JFET-input op-amp (e.g., OPA2134) to isolate the 75 Ω wiper resistance from downstream stages.
추천
Programmable Gain Amplifier
Using the MCP4441-104E/ST in the feedback network of an op-amp creates a digitally programmable gain stage with 129 discrete gain steps. The 100 kΩ value pairs well with 10 kΩ input resistors to give gains from 1 to 11 in fine increments. Wiper resistance (75 Ω) becomes a series gain error at the highest settings, so choose an op-amp with low input bias current and adequate bandwidth (e.g., GBW ≥ 10 MHz). Non-volatile memory enables field-recalibration without re-initializing on every power-up.
추천
LCD Contrast Trimming
Character LCDs typically need a -2 V to -5 V bias on the Vo pin, set by a potentiometer between VDD and VEE. The MCP4441-104E/ST can replace the mechanical trim pot with software-driven, non-volatile contrast control. Use a channel divider between the LCD driver supply rails; 7-bit resolution gives ~40 mV steps at a 5 V swing, more than fine for character modules. The non-volatile EEPROM means contrast is set once at factory calibration and survives power-cycles, eliminating the manual trim step on the production line.
추천
Sensor Calibration and Offset Nulling
Bridge sensors (strain gauges, load cells, thermocouples) require offset trimming at production. The MCP4441-104E/ST's four channels allow simultaneous nulling of multiple sensor channels on the same board - one IC trims four bridges. With ±20% end-to-end tolerance, use the digipot only for fine adjustment after coarse fixed-resistor calibration; or characterize the actual end-to-end value at test and apply a software correction. The -40 °C to +125 °C operating range covers industrial sensor environments.
추천
Programmable Filter Cutoff Frequency
Placing the MCP4441-104E/ST in the resistance slot of an RC or Sallen-Key low-pass filter enables digital tuning of the cutoff frequency over a 128:1 range. With a fixed capacitor, the cutoff f_c = 1/(2πRC) tracks the wiper position linearly. Using 100 kΩ end-to-end and 1 nF gives a 1.6 kHz to 200 kHz tunable band, ideal for anti-aliasing filters in front of variable-rate ADCs. The low 75 Ω wiper resistance is negligible compared to 100 kΩ, so Q-factor stays close to the design value across the full range.
추천
Industrial Process-Control Setpoint
In 4-20 mA current loop or 0-10 V process-control loops, the MCP4441-104E/ST can store a non-volatile setpoint that survives power-loss, eliminating the need for EEPROM at the microcontroller. The I2C interface allows remote adjustment from a PLC or HMI over an isolation barrier using an I2C isolator (e.g., ISO1541D). The four channels enable four independent setpoint outputs from one chip. Operating temperature up to +125 °C supports unconditioned industrial enclosures.
추천
추천 제품 요약
엔지니어링 참조 데이터: MCP4441-104E/ST — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MCP4441T-104E/ST | MCP4442-104E/ST | MCP4441-503E/ST | MCP4361-503E/ST | MCP4342-503E/ST |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-pin TSSOP | 20-pin TSSOP - same | 20-pin TSSOP - same | 20-pin TSSOP - same | 20-pin TSSOP - same | 20-pin TSSOP - same |
| End-to-End Resistance | 100 kΩ | 100 kΩ - same | 100 kΩ - same | 50 kΩ | 50 kΩ | 50 kΩ |
| Number of Taps | 129 (7-bit) | 129 (7-bit) | 129 (7-bit) | 129 (7-bit) | 257 (8-bit) | 129 (7-bit) |
| Number of Channels | 4 (Quad) | 4 (Quad) | 4 (Quad) | 4 (Quad) | 4 (Quad) | 2 (Dual) |
| Control Interface | I2C | I2C - same | I2C - same | I2C - same | SPI | SPI |
| Supply Voltage Range | 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 |
| Wiper Resistance (typical) | 75 Ω | 75 Ω - same | 75 Ω - same | 75 Ω - same | 75 Ω - same | 75 Ω - same |
| Absolute Terminal Voltage | VDD to VSS | VDD to VSS | Up to 12 V (higher tolerance) | VDD to VSS | VDD to VSS | VDD to VSS |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
주요 차별점
- Quad 7-bit non-volatile channels in TSSOP-20 (vs MCP4361-503E/ST)
- Higher terminal voltage tolerance versus fixed-voltage family (vs MCP4442-104E/ST)
- 100 kΩ value matches audio and instrumentation signal levels (vs MCP4441-503E/ST)
설계 노트
Decouple VDD with a 0.1 µF ceramic capacitor placed within 3 mm of the VDD pin (pin 20). The MCP4441-104E/ST draws very low quiescent current (microamps), but I2C bus activity and EEPROM writes create brief transients. For multi-channel boards, add a bulk 1 µF to 10 µF capacitor near the IC. When using the digipot as a voltage divider, ensure both terminals stay within the VSS-to-VDD range; signals outside this range will forward-bias ESD clamps and degrade linearity.
Avoid loading the wiper with impedances below 10 kΩ. The 75 Ω typical wiper resistance is in series with the load and will dominate the divider ratio if the load is comparable. Always buffer the wiper with an op-amp follower when driving low-impedance downstream stages. Also note that the I2C SDA and SCL pins do NOT have internal pull-ups (per datasheet pin description) - external pull-ups (typically 2.2 kΩ to 10 kΩ for 3.4 MHz high-speed mode) are mandatory.
For audio or precision analog applications, place the MCP4441-104E/ST away from digital clock traces and switching power supplies. The 75 Ω wiper resistance and CMOS switch capacitance (≈10 pF per tap) can inject small switching transients into sensitive analog nodes. Use a ground guard ring around the IC if the application requires < -90 dB crosstalk. Adding a small RC filter (1 kΩ + 1 nF) on the wiper output attenuates the tap-to-tap charge injection spike to negligible levels.
규정 준수 정보
RoHS and lead-free compliance per Microchip product page. AEC-Q100 not applicable (consumer/industrial grade). Halogen-free status not explicitly listed - defaulting to 'unknown' rather than guessing.
