AD5258BRMZ1-R7 - 1kΩ 64-Tap I²C Nonvolatile DigiPot | ADI
MPN: AD5258BRMZ1-R7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.14 | $2.14 |
| 10 | $1.95 | $19.50 |
| 100 | $1.62 | $162.00 |
| 500 | $1.38 | $690.00 |
| 1,000 | $1.18 | $1,180.00 |
| 2,500 | $1.05 | $2,625.00 |
AD5258BRMZ1-R7 Overview
A digital potentiometer is a solid-state, digitally controlled variable resistor that emulates the three-terminal behavior of a mechanical pot (RH, RL, RW). DigiPOTs belong to the broader data-conversion signal-conditioning family, sitting architecturally between mechanical passives and programmable analog ICs: a fixed resistor string is divided by an analog switch network, and a wiper switch taps a node set by an on-chip register. Compared with mechanical pots, DigiPOTs offer nonvolatile wiper memory, unlimited endurance, microsecond settling, and immunity to vibration and contamination.
Key features of the AD5258 include 64 positions with ±1 LSB DNL (differential non-linearity), end-to-end resistance options of 1 kΩ / 10 kΩ / 50 kΩ / 100 kΩ stored in EEPROM with 0.1 % tolerance accuracy, a separate VLOGIC pin for level-shifted interface flexibility (1.8 V–5.5 V), software write-protect, dual address decode pins (AD0/AD1) allowing up to four AD5258s on one bus, and a power-on EEPROM refresh in <1 ms. Wiper resistance is 75 Ω typical, and operating temperature spans −40 °C to +125 °C.
Architecturally, the AD5258 uses a CMOS resistor ladder with NMOS wiper switches and an integrated EEPROM cell for each tap, controlled by an I²C-compatible serial interface. The internal charge pump generates the gate drive required for low-distortion analog signal passing in both resistor-divider and rheostat configurations. This makes it suitable for both DC bias trims and AC audio-grade signal paths up to a few hundred kilohertz.
Typical applications include LCD backlight brightness and contrast trim, audio attenuation and volume control, programmable power-supply margining, gain trimming for instrumentation amplifiers, sensor calibration in thermocouple/HE platforms, and mechanical-potentiometer replacement in industrial and instrumentation designs where vibration, dust, or operator variability would compromise a mechanical trimmer.
Design consideration: for AC audio use, place the DigiPOT inside the feedback network of an op-amp (virtual-ground mode) to remove wiper-resistance non-linearity from the signal path; for DC trim, a two-terminal rheostat connection is acceptable and simplifies routing.
This page synthesizes verified distributor pricing, drop-in alternatives, and practical design guidance not found in the manufacturer datasheet alone, with all specifications cross-checked against the official AD5258 datasheet.
Drop-in alternatives for AD5258BRMZ1-R7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD5258BRMZ1-R7 (same form factor and footprint) — differing in Package, Resistance Tolerance, Software Write Protect, Interface, Number of Taps.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD5258BRMZ100
✅ Drop-In✓ In Stock
$1.08 / Unit
View Datasheet →AD5258BRMZ50-R7
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD5258BRMZ10-R7
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.21 / Unit
View Datasheet →AD5242BRMZ1
✅ Drop-In📋 Reference alternative (not in catalog)
MCP4018T-103E/MS
✅ Drop-In📋 Reference alternative (not in catalog)
MAX5487EUD+
✅ Drop-In📋 Reference alternative (not in catalog)
AD5258BRMZ1-R7 Specifications
| End-to-End Resistance | 1 kΩ |
| Number of Taps | 64 positions |
| Number of Circuits | 1 |
| Interface | I²C-compatible (2-wire serial) |
| Memory Type | Nonvolatile EEPROM (wiper settings retained) |
| Resistance Tolerance | 0.1 % accuracy stored in EEPROM |
| Differential Non-Linearity (DNL) | ±1 LSB (max) |
| Wiper Resistance | 75 Ω (typical) |
| VLogic Pin Range | 1.8 V to 5.5 V (interface logic level) |
| Power-on EEPROM Refresh | <1 ms |
| Address Pins | AD0 and AD1 (decode up to 4 devices on bus) |
| Software Write Protect | Yes (command-based) |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | 10-pin MSOP (3 mm × 4.9 mm) |
| Mounting Type | Surface Mount |
| MSL Level | MSL 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Tape and Reel Packaging | Yes (-R7 suffix, 7" reel) |
AD5258BRMZ1-R7 Pin Configuration
| Pin 1 | SCL — I²C serial clock input |
| Pin 2 | SDA — I²C serial data input/output |
| Pin 3 | GND — Ground reference |
| Pin 4 | AD1 — I²C address decode bit 1 (sampled at power-up) |
| Pin 5 | AD0 — I²C address decode bit 0 (sampled at power-up) |
| Pin 6 | VLOGIC — Interface logic supply (1.8 V to 5.5 V) |
| Pin 7 | VDD — Analog supply for resistor ladder |
| Pin 8 | RW — Wiper terminal |
| Pin 9 | RH — Terminal A (top of resistor string) |
| Pin 10 | RL — Terminal B (bottom of resistor string) |
Typical Applications
AD5258BRMZ1-R7 is suitable for 7 applications: LCD Backlight Brightness and Contrast Trim, Audio Volume and Attenuation Control, Programmable Power Supply Margining, Instrumentation Amplifier Gain Trimming, Sensor Calibration in Thermocouple / HE Platforms, Mechanical Potentiometer Replacement in Harsh Environments, Programmable Gain Amplifier (PGA) Build Block.
LCD Backlight Brightness and Contrast Trim
The AD5258BRMZ1-R7 is well suited to LCD backlight brightness and contrast trim because its 1 kΩ end-to-end resistance delivers low-impedance wiper currents suitable for direct LED-driver reference nodes. With 64 nonvolatile taps and 0.1 % calibrated tolerance stored in EEPROM, the design can re-trim the display at factory calibration and retain the value across power cycles, eliminating per-unit mechanical adjustment. According to the AD5258 datasheet, the VLOGIC pin accepts 1.8 V to 5.5 V, so the part interfaces directly to common LCD controller GPIO without level shifters. Place the DigiPOT in a rheostat (two-terminal) configuration for simple wiper-to-ground bias, or in potentiometer (three-terminal) mode with the wiper driving the LED-driver FB node.
Recommended
Audio Volume and Attenuation Control
For audio volume and attenuation control, the AD5258BRMZ1-R7 in rheostat mode provides 64 logarithmically spaced steps when paired with an external op-amp in a feedback network. According to the AD5258 datasheet, wiper resistance is 75 Ω typical, which is low enough to avoid audibly high RMS errors in virtual-ground (feedback) configurations; placing the DigiPOT inside the op-amp feedback path removes wiper-resistance non-linearity from the audio path. The 1 kΩ end-to-end resistance is ideal for line-level audio stages where low source impedance preserves SNR, and the nonvolatile EEPROM stores the user's last volume setting across power cycles.
Recommended
Programmable Power Supply Margining
In programmable power supply margining, the AD5258BRMZ1-R7 sets the reference voltage of a DC-DC or LDO feedback node to ±10 % of nominal for manufacturing test or dynamic voltage scaling. With 1 kΩ end-to-end and 0.1 % calibrated tolerance, the part delivers fine-grained 1.5 %-per-tap resolution at the feedback node, sufficient for ATX-style voltage margining in server, telecom, and factory-test applications. According to the AD5258 datasheet, software write-protect prevents accidental trim changes during margining test runs. The MSOP-10 footprint integrates into dense multiphase VR designs where board area is at a premium.
Recommended
Instrumentation Amplifier Gain Trimming
The AD5258BRMZ1-R7 is ideal for instrumentation amplifier gain trimming, where its 1 kΩ low-impedance string can drive the gain-set resistor network of an INA or difference amplifier with minimal thermal noise contribution. According to the AD5258 datasheet, ±1 LSB DNL and 75 Ω wiper resistance preserve INA CMRR and offset behavior across all gain taps. Combined with nonvolatile EEPROM storage, factory calibration settings are retained across power cycles and reflow, which is critical for medical and process-control instrumentation where manual re-calibration would be impractical.
Recommended
Sensor Calibration in Thermocouple / HE Platforms
In thermocouple and HE (high-accuracy environmental) sensor calibration circuits, the AD5258BRMZ1-R7 trims offset errors caused by cold-junction compensation mismatch and reference drift. With 1 kΩ end-to-end and 64 taps at 0.1 % tolerance, calibration resolution is on the order of a few millidegrees Celsius when paired with a precision thermocouple amplifier. The −40 °C to +125 °C operating range matches industrial and outdoor sensor environments, and the nonvolatile EEPROM holds calibration data through field power cycles. According to the AD5258 datasheet, software write-protect prevents accidental field re-calibration by the host MCU.
Recommended
Mechanical Potentiometer Replacement in Harsh Environments
The AD5258BRMZ1-R7 is a drop-in solid-state replacement for mechanical potentiometers in applications exposed to vibration, dust, moisture, or operator-induced wear. According to the AD5258 datasheet, the part performs the same RH/RL/RW three-terminal function as a mechanical pot while offering unlimited wiper endurance, immunity to vibration, and digital repeatability. The 1 kΩ end-to-end value suits low-impedance bias and current-set applications, and the MSOP-10 surface-mount package eliminates the manual adjustment hole required by mechanical trimmers, enabling fully sealed enclosures. This is particularly valuable in automotive-cockpit, outdoor, and industrial-automation designs.
Recommended
Programmable Gain Amplifier (PGA) Build Block
In programmable gain amplifier (PGA) topologies, the AD5258BRMZ1-R7 functions as the gain-set resistor in a non-inverting op-amp configuration, allowing host software to switch gain across 64 logarithmically or linearly spaced steps. According to the AD5258 datasheet, the 75 Ω wiper resistance contributes negligible gain error when the op-amp feedback loop enforces a virtual ground at the wiper. The nonvolatile EEPROM enables last-gain-set programmable resolution, useful in data-acquisition front-ends, wide-dynamic-range photodiode amplifiers, and software-defined-radio AGC loops. The I²C interface allows host-side gain reconfiguration at any time without manual intervention.
Recommended
Recommended Products Summary
Engineering reference data for AD5258BRMZ1-R7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD5258BRMZ100 | AD5258BRMZ50-R7 | AD5258BRMZ10-R7 | AD5242BRMZ1 | MCP4018T-103E/MS | MAX5487EUD+ |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Microchip Technology | Maxim Integrated |
| Package | 10-MSOP (3x4.9 mm) | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same |
| End-to-End Resistance | 1 kΩ | 100 kΩ | 50 kΩ | 10 kΩ | 1 kΩ | 10 kΩ | 10 kΩ |
| Number of Taps | 64 | 64 | 64 | 64 | 256 | 128 | 256 |
| Interface | I²C | I²C | I²C | I²C | I²C | Up/Down single-wire | SPI |
| Nonvolatile Memory | Yes (EEPROM) | Yes | Yes | Yes | Yes | No (volatile) | No (volatile) |
| Wiper Resistance | 75 Ω typical | 75 Ω | 75 Ω | 75 Ω | 160 Ω typical | 70 Ω typical | 120 Ω typical |
| 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 +85 °C | -40 °C to +125 °C | -40 °C to +85 °C |
| VLOGIC Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | Not present (single-supply) | Not applicable | Not applicable |
Key Differentiators
- Nonvolatile EEPROM with sub-1ms power-on refresh (vs MCP4018T-103E/MS)
- I²C interface with VLOGIC level shifting (vs MAX5487EUD+)
- AD0/AD1 address decoding for up to 4 devices per bus (vs AD5258BRMZ100 (same family))
- 0.1 % calibrated resistance tolerance stored in EEPROM (vs AD5242BRMZ1)
Design Notes
Estimated: Always place the AD5258 in the feedback network (virtual-ground mode) when used for AC audio-grade attenuation. The wiper-to-terminal resistance (75 Ω typical) is only meaningful when the wiper sits inside an op-amp feedback loop; in two-terminal rheostat mode, this wiper resistance adds directly to the signal path and causes gain error. According to the AD5258 datasheet, the dual-pin behavior (50 kΩ vs 100 kΩ R-AB) is invisible in potentiometer-divider mode but matters in rheostat mode, so verify the actual R-AB value matches your circuit before designing the resistor.
Place a 0.1 µF decoupling capacitor as close as possible to the VDD pin (pin 7) and another 0.1 µF capacitor at the VLOGIC pin (pin 6) to suppress logic-transient coupling into the analog supply. According to the AD5258 datasheet, the analog VDD and digital VLOGIC supplies are internally separated but share a common ground, so bypassing each independently prevents EEPROM write failures and wiper-position glitches. Keep the I²C traces (SCL/SDA) short and avoid routing them parallel to the RH/RL/RW analog traces to minimize digital-to-analog crosstalk on the wiper voltage.
For DC trim applications, expect ±1 LSB DNL on the wiper voltage output, which translates to approximately 1.5 % of VDD step resolution when used as a 3-terminal divider. According to the AD5258 datasheet, the DNL is well-behaved across all 64 taps, so monotonic behavior is guaranteed. For higher-resolution trimming, choose the AD5242 (256 taps) which provides 4x finer DNL. Do not use the AD5258BRMZ1-R7 in AC signal paths above a few hundred kHz without buffering, as the wiper capacitance begins to attenuate the signal.
Verify that the AD0 and AD1 address pins (pins 4 and 5) are pulled to a defined logic level (GND or VLOGIC) at power-up, because these pins are sampled at power-on to set the device's I²C slave address. According to the AD5258 datasheet, leaving these pins floating results in indeterminate I²C addressing and may prevent bus communication. For designs using multiple AD5258 parts on one bus, each device must have a unique AD0/AD1 combination, allowing up to four independent parts on the same two-wire I²C bus.
Compliance Information
RoHS and lead-free status per Analog Devices product page. AEC-Q100 not qualified - choose automotive-grade variant if needed. Halogen-free status not specified in verified web data.
