Analog Devices Inc. AD5170BRMZ2.5

Overview

AD5170BRMZ2.5 from Analog Devices is a 256-position, two-time programmable (TTP) I²C digital potentiometer with 2.5 kΩ end-to-end resistance, 35 ppm/°C temperature coefficient, and 5 µs typical wiper settling time. It operates from 2.7 V to 5.5 V, supports full read/write of the wiper register, and powers up to midscale. It replaces mechanical trimmers in factory-set calibration circuits requiring nonvolatile, repeatable resistance settings.

For engineers reviewing the AD5170BRMZ2.5 datasheet, AD5170BRMZ2.5 pinout, AD5170BRMZ2.5 application, or AD5170BRMZ2.5 equivalent, key selection considerations include its fuse-based TTP architecture, I²C address flexibility via AD0/AD1 pins, OTP overwrite capability for dynamic preset restoration, and guaranteed monotonicity in both rheostat and potentiometer modes.

Technical Context

The AD5170BRMZ2.5 implements fuse-link nonvolatile memory with two independent programming opportunities: first permanent setting (OTP), and optional second-chance overwrite before power cycle. Its I²C interface complies with standard timing (400 kHz max clock, t_SU;DAT = 100 ns), and internal logic validates fuse status via E1/E0 bits after programming.

In rheostat mode, it delivers 256-step resistance between W and B terminals using RWB(D) = (D/256) × R_AB + 2 × R_W, where R_W = 200 Ω typical. In potentiometer divider mode, output voltage follows VW(D) = (D/256) × VA + ((256−D)/256) × VB, achieving 15 ppm/°C voltage-divider tempco due to ratio-based operation.

Key Specifications

Pinout & Package

AD5170BRMZ2.5 is housed in a compact 10-lead MSOP package (3 mm × 4.9 mm), optimized for space-constrained PCB layouts while maintaining thermal performance (θ_JA = 167.8°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital potentiometer applications.

Compared with AD5170BRMZ2.5, AD5171BRMZ2.5 sacrifices I²C address flexibility for minimal footprint, while MCP45HV51-2.5ML trades TTP reliability and low tempco for extended voltage range and EEPROM endurance-making AD5170BRMZ2.5 optimal for factory-programmed, thermally stable, multi-node calibration systems.

Availability

AD5170BRMZ2.5 is available at Aetrix Electronics and suitable for factory calibration, sensor signal conditioning, RF amplifier biasing, and industrial level setting requiring stable component supply across automotive, industrial, and test equipment programs.

Supply support for AD5170BRMZ2.5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD5170BRMZ2.5 belongs to Analog Devices' precision digital potentiometer family, engineered specifically for factory-programmed, thermally stable resistance trimming in mission-critical calibration and sensor interface applications.

FAQ

What is the purpose of the AD0 and AD1 pins on the AD5170BRMZ2.5?

The AD0 and AD1 pins configure the two least-significant bits of the AD5170BRMZ2.5's 7-bit I²C slave address, enabling up to four AD5170BRMZ2.5 devices on the same I²C bus without address conflict. They accept CMOS logic levels referenced to VDD and must be hard-wired to GND or VDD during PCB design-no dynamic reconfiguration is supported. This eliminates external I²C multiplexers in multi-channel calibration systems.

Can the AD5170BRMZ2.5 be reprogrammed after the first OTP activation?

Yes-the AD5170BRMZ2.5 supports one additional programming opportunity after initial OTP activation via its unique OTP overwrite feature. This allows temporary runtime adjustment of the wiper position; however, the original OTP value is restored automatically at the next power-up. The overwrite does not consume the second programming chance-it preserves it for verified reprogramming during factory rework or final test.

What is the maximum continuous current rating for the wiper terminal (W) of the AD5170BRMZ2.5?

The AD5170BRMZ2.5 wiper terminal (W) is rated for ±5 mA continuous current and ±20 mA pulsed current. Exceeding ±5 mA continuously risks degradation of the internal CMOS switch contact, especially at code 0x00 where wiper resistance is lowest (320 Ω typical). For rheostat-mode applications drawing >5 mA, external current limiting or parallel buffering is recommended to ensure long-term reliability.

How does the AD5170BRMZ2.5 achieve 15 ppm/°C voltage-divider temperature coefficient?

The AD5170BRMZ2.5 achieves 15 ppm/°C voltage-divider tempco by leveraging ratio-matching between its internal resistor segments (RWA and RWB) rather than absolute resistance stability. Since both segments track similarly with temperature, the output voltage VW(D) = (D/256) × VA + ((256−D)/256) × VB depends on proportion-not absolute values-reducing sensitivity to thermal drift. This is distinct from its 35 ppm/°C RAB tempco, which applies only to end-to-end resistance.

Is an external high-voltage supply required to program the AD5170BRMZ2.5 OTP function?

Yes-an external 5.6 V to 5.8 V supply capable of delivering 100 mA for ~400 ms is required to blow the OTP fuses in the AD5170BRMZ2.5. This supply must be isolated from the main 2.7–5.5 V VDD rail during programming. Systems with only 3.3 V or 5 V supplies must add a dedicated OTP programming circuit; failure to meet voltage/timing specs may result in incomplete fuse blow or device failure (E1=1, E0=0 status).