AD5258BRMZ100 - 100kΩ 64-Tap I2C Nonvolatile DigiPot | ADI
N.º da peça: AD5258BRMZ100 ⚠ Última compra| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.18 | $2,18 |
| 10 | $1.94 | $19,40 |
| 100 | $1.62 | $162,00 |
| 500 | $1.31 | $655,00 |
| 1.000 | $1.08 | $1.080,00 |
AD5258BRMZ100 Visão geral
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.
Alternativas drop-in para AD5258BRMZ100 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com AD5258BRMZ100 (mesmo formato e footprint) — diferindo em Package, Interface, Number of Taps, Memory Type, Operating Temperature.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
AD5258BRMZ50
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD5258BRMZ10
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD5258BRMZ1
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD5258BRMZ100-R7
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD5259BRMZ100
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD5142ABCPZ10-RL7
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$3.36 / unidade
Ver ficha técnica →AD5258BRMZ100 Classificações máximas e características elétricas
| 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 % |
| Interface | 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) |
| Faixa de temperatura de operação | −40 °C to +125 °C |
| Encapsulamento | 10-pin MSOP (RM), 3 mm × 4.9 mm |
| Taper | Linear |
| Status RoHS | Compliant |
Configuração de pinos do AD5258BRMZ100
| Pino 1 | AD0 — I²C address decode pin 0 (latched at power-up) |
| Pino 2 | A — Resistor terminal A (fixed end) |
| Pino 3 | W — Wiper terminal |
| Pino 4 | B — Resistor terminal B (fixed end) |
| Pino 5 | GND — Ground |
| Pino 6 | SDA — I²C serial data |
| Pino 7 | SCL — I²C serial clock |
| Pino 8 | VDD — Analog supply voltage (2.7 V–5.5 V) |
| Pino 9 | VLOGIC — Digital interface supply (2.7 V–5.5 V, independent of VDD) |
| Pino 10 | AD0 — I²C address decode pin 1 (latched at power-up) |
Aplicações típicas
AD5258BRMZ100 é adequado para 6 aplicaçãos: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para AD5258BRMZ100 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 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 |
Principais diferenciais
- Pin-compatible 100 kΩ variant in reel packaging for SMT lines (vs AD5258BRMZ100-R7)
- Higher 256-tap resolution upgrade in same footprint (vs AD5259BRMZ100)
- Lower resistance variants drop-in for different impedance designs (vs AD5258BRMZ50 / AD5258BRMZ10 / AD5258BRMZ1)
- Active-life replacement with extra EEPROM and wider R range (vs AD5142ABCPZ10-RL7)
Notas de projeto
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.
Informações de conformidade
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.
