AD5258BRMZ100 - 100kΩ 64-Tap I2C Nonvolatile DigiPot | ADI
MPN: AD5258BRMZ100 ⚠ Lần mua cuốiAD5258BRMZ100 Tóm tắt
A digital potentiometer (DigiPOT) is a solid-state, electronically-controlled variable resistor that replaces a mechanical trimpot. It exposes three terminals — the two fixed end-points (A and B) and a wiper (W) — and lets an MCU step the wiper position through a finite set of taps via a digital interface. DigiPOTs are widely used for gain trimming, LCD contrast biasing, audio attenuation, and sensor calibration where mechanical pots are unreliable or where remote/automated adjustment is required. The AD5258 family occupies the small-footprint, low-cost end of the DigiPOT hierarchy: larger (>256-tap) or higher-voltage parts from ADI (AD5260/AD5290) sit above it; basic mechanical potentiometers and analog rheostats sit below.
Key features include 64 tap positions, 100 kΩ nominal end-to-end resistance, ±30 % resistance tolerance, 0.1 % EEPROM-stored tolerance accuracy, <1 ms power-on EEPROM refresh, software write-protect command, and an operating temperature range of −40 °C to +125 °C. The MSOP-10 footprint is only 3 mm × 4.9 mm, making it one of the smallest nonvolatile DigiPOTs on the market.
The internal architecture combines a resistor ladder with CMOS switches and a serial EEPROM shadow register. On every power-up the device restores the last-saved wiper position within 1 ms, eliminating the need for software re-initialization. The separate VLOGIC pin isolates the digital interface supply from the analog terminal supply, which simplifies mixed-voltage designs where a 3.3 V MCU controls a 5 V analog rail.
Typical applications include LCD contrast and backlight bias adjustment, audio volume control, programmable gain amplifiers, sensor excitation calibration, and mechanical potentiometer/trimpot replacement in industrial, automotive, and instrumentation systems. According to the manufacturer datasheet, ADI has marked the AD5258 family LAST TIME BUY, so designers should plan second-source alternatives now.
When designing with this part, treat the analog terminals as low-current signal nodes — the AD5258 is intended for control-loop trimming, not as a power rheostat. Use Kelvin-aware PCB layout when the wiper feeds a high-impedance op-amp input, and observe the absolute maximum terminal voltage of 5.5 V even when the device is unpowered.
This page consolidates distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving a single reference point for AD5258BRMZ100 sourcing.
Bộ thay thế dễ dàng lắp đặt cho AD5258BRMZ100 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD5258BRMZ100 (cùng hình factor và footprint) — khác nhau ở Package, Interface, Number of Taps, Memory Type, Operating Temperature.
AD5258BRMZ50
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD5258BRMZ10
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD5258BRMZ1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD5258BRMZ100-R7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD5259BRMZ100
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD5142ABCPZ10-RL7
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD5258BRMZ100 Tỷ lệ tối đa & tính chất điện
| Product Type | Digital Potentiometer (DigiPOT) |
| Number of Channels | 1 |
| Number of Taps | 64 |
| End-to-End Resistance | 100 kΩ |
| Resistance Tolerance | ±30 % |
| EEPROM-stored Tolerance Accuracy | 0.1 % |
| Giao diện | I²C-compatible (2-wire) |
| Address Decode Pins | AD0 (2 pins, supports up to 4 devices on bus) |
| VLOGIC Range | 2.7 V to 5.5 V |
| Analog Supply / Terminal Voltage | 2.7 V to 5.5 V |
| Power-on EEPROM Refresh Time | < 1 ms |
| Nonvolatile Memory | Yes (wiper settings retained on power-down) |
| Software Write Protect | Yes (via I²C command) |
| Khoảng nhiệt độ hoạt động | −40 °C to +125 °C |
| Hộp | 10-pin MSOP (RM), 3 mm × 4.9 mm |
| Taper | Linear |
| Trạng thái RoHS | Compliant |
Cấu hình chân AD5258BRMZ100
| Chân 1 | AD0 — I²C address decode pin 0 (latched at power-up) |
| Chân 2 | A — Resistor terminal A (fixed end) |
| Chân 3 | W — Wiper terminal |
| Chân 4 | B — Resistor terminal B (fixed end) |
| Chân 5 | GND — Ground |
| Chân 6 | SDA — I²C serial data |
| Chân 7 | SCL — I²C serial clock |
| Chân 8 | VDD — Analog supply voltage (2.7 V–5.5 V) |
| Chân 9 | VLOGIC — Digital interface supply (2.7 V–5.5 V, independent of VDD) |
| Chân 10 | AD0 — I²C address decode pin 1 (latched at power-up) |
Ứng dụng tiêu biểu
AD5258BRMZ100 phù hợp cho 6 Áp dụngs: LCD Contrast and Backlight Bias Adjustment, Audio Volume Control, Programmable Gain Amplifier Calibration, Sensor Excitation and Threshold Calibration, Mechanical Potentiometer Replacement (Industrial / Automotive), Adjustable Voltage Reference Biasing.
LCD Contrast and Backlight Bias Adjustment
The AD5258BRMZ100 is widely used to replace mechanical contrast trimpots on character LCD modules. Its 64 tap positions give a finer adjustment step than typical 10-turn pots, and the I²C interface lets the host MCU trim contrast automatically based on ambient-light sensor input — eliminating factory manual calibration. With a 100 kΩ end-to-end resistance and <1 ms power-on refresh, it can drive a voltage divider that biases the LCD V0 pin across the 2.7 V–5.5 V analog supply range. Because the part draws microamp-level quiescent current, it is well suited to battery-powered handheld instruments that need to retain contrast setting through power cycles.
Được đề xuất
Audio Volume Control
In low-cost audio paths (headsets, intercoms, two-way radios), the AD5258BRMZ100 acts as a digital volume control by sitting in the feedback network of an op-amp or as an L-pad attenuator feeding a power stage. The 100 kΩ end-to-end resistance keeps the wiper well above typical 10 kΩ audio source impedances, preserving signal-to-noise ratio, and the linear taper maps naturally to a logarithmic volume curve when paired with a software lookup table. The VLOGIC pin lets a 3.3 V DSP or codec drive the I²C bus while the analog audio path runs on 5 V. Designers should keep total harmonic distortion below audibility by routing the wiper through a low-noise op-amp buffer.
Được đề xuất
Programmable Gain Amplifier Calibration
The AD5258BRMZ100 sets the gain of an inverting or non-inverting op-amp stage by trimming the feedback resistor ratio. Because the resistance tolerance is stored in on-chip EEPROM with 0.1 % accuracy, the MCU can read the actual value over I²C and apply a digital correction, eliminating manual calibration entirely. The 100 kΩ nominal works well with op-amps such as the AD8628 or AD8656 in precision instrumentation front-ends, where the digital pot provides coarse gain steps and a fixed resistor handles precision. Nonvolatile storage means the calibrated gain survives power cycling — critical for handheld test equipment.
Được đề xuất
Sensor Excitation and Threshold Calibration
Bridge sensors (strain gauge, RTD, load cell) require precise excitation-voltage trimming to compensate for part-to-part sensitivity variation. The AD5258BRMZ100 can scale the bridge excitation voltage in 64 steps, allowing software-based sensor calibration at production or in the field via I²C. The 2.7 V–5.5 V analog range covers most 3.3 V and 5 V sensor rails, and the software write-protect command locks the calibration against accidental overwrites. Industrial PLCs and smart transmitters benefit from the solid-state reliability versus mechanical trim pots in high-vibration environments.
Được đề xuất
Mechanical Potentiometer Replacement (Industrial / Automotive)
Mechanical pots fail under vibration, dust, and thermal cycling — the AD5258BRMZ100 replaces them with a solid-state, I²C-controlled equivalent. The −40 °C to +125 °C operating range and >100 k write-cycle EEPROM endurance make it suitable for industrial control panels and instrument-cluster dimming circuits. Because the part is now LAST TIME BUY per the Analog Devices product page, designers are actively using the BRMZ100 (and pin-compatible AD5259/AD5142ABCPZ10-RL7) as lifetime-buy replacements on new PCB revisions.
Được đề xuất
Adjustable Voltage Reference Biasing
Precision voltage references (e.g., ADR01/ADR02) sometimes need fine output trim for calibration against an internal ADC. The AD5258BRMZ100 sits in the trim pin divider and provides 64 adjustment steps with <1 ms power-on settling — ideal for instrumentation that must come up in a known state. The wide 2.7 V–5.5 V supply tolerance covers both 3.3 V and 5 V reference designs, and the I²C write-protect command prevents inadvertent calibration changes during brown-out events.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD5258BRMZ100 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | AD5258BRMZ50 | AD5258BRMZ10 | AD5258BRMZ1 | AD5258BRMZ100-R7 | AD5259BRMZ100 | AD5142ABCPZ10-RL7 |
|---|---|---|---|---|---|---|---|
| Package | MSOP-10 (RM) | MSOP-10 (RM) - same | MSOP-10 (RM) - same | MSOP-10 (RM) - same | MSOP-10 (RM) - same | MSOP-10 (RM) - same | MSOP-10 (RM) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| End-to-End Resistance | 100 kΩ | 50 kΩ | 10 kΩ | 1 kΩ | 100 kΩ | 100 kΩ | 10 kΩ |
| Number of Taps | 64 | 64 | 64 | 64 | 64 | 256 | 256 |
| Interface | I²C | I²C | I²C | I²C | I²C | I²C | I²C/SPI |
| Nonvolatile Memory | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| VLOGIC Pin | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Lifecycle Status | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy | Active |
Bảo phân biệt quan trọng
- Pin-compatible 100 kΩ variant in reel packaging for SMT lines (vsAD5258BRMZ100-R7)
- Higher 256-tap resolution upgrade in same footprint (vsAD5259BRMZ100)
- Lower resistance variants drop-in for different impedance designs (vsAD5258BRMZ50 / AD5258BRMZ10 / AD5258BRMZ1)
- Active-life replacement with extra EEPROM and wider R range (vsAD5142ABCPZ10-RL7)
Ghi chú thiết kế
Power the AD5258BRMZ100 from a clean 2.7 V–5.5 V analog rail. VLOGIC may be tied to VDD for single-supply designs or driven from the host MCU rail (typically 3.3 V) to enable mixed-voltage interfacing. Place a 0.1 µF decoupling capacitor as close as possible to the VDD pin and a 1 µF bulk cap on VLOGIC; the part draws <1 µA quiescent current but the EEPROM refresh burst during power-up (<1 ms) needs low-impedance supply. According to the manufacturer datasheet, the absolute maximum terminal voltage is 5.5 V — exceeding this even briefly during hot-plug events can permanently damage the CMOS switches.
Route the SDA/SCL traces as a differential pair and keep them away from switching-node or analog-signal traces that could couple noise into the I²C bus. Pull-up resistors on SDA and SCL should be sized for the bus capacitance — typically 2.2 kΩ to 4.7 kΩ at 3.3 V, 4.7 kΩ to 10 kΩ at 5 V. Add a small capacitor (≤100 pF) on each line if the bus is long (>10 cm) to damp ringing. Verify I²C timing with a logic analyser during bring-up; many AD5258 communication failures trace to pull-up values that are too weak for the system capacitance rather than to the IC itself.
The AD5258BRMZ100 is a low-current signal-trimming device — do NOT use it as a power rheostat for LEDs, heaters, or audio output stages. The wiper current is limited to a few mA; exceeding it will permanently damage the CMOS switches. Also note that the two AD0 address pins are latched only at power-up; toggling them dynamically will NOT change the I²C address. Use the software write-protect command (per the manufacturer datasheet) to lock the wiper position before deploying firmware updates that touch the I²C bus, otherwise unintended writes can shift the calibration.
The MSOP-10 (RM) package has a thermal pad slug underneath that is electrically tied to GND — solder it to a sufficiently large copper pour for mechanical stability, even though the part dissipates negligible power. For high-impedance analog inputs driven by the wiper (terminal W), use a guard trace or Kelvin layout to minimise leakage; the 100 kΩ end-to-end resistance means a 1 GΩ board leakage path can introduce >0.01 % error. Keep the A, B, and W traces short and away from digital switching signals to preserve wiper-position accuracy in DC gain-trim applications.
Thông tin tuân thủ
RoHS and lead-free per the manufacturer product page. AD5258 family is not AEC-Q100 qualified — for automotive designs requiring AEC-Q100, contact Analog Devices for automotive-grade alternatives.
