Analog Devices Inc. AD8205YRZ-RL

Overview

AD8205YRZ-RL from Analog Devices is a single-supply, high-voltage difference amplifier optimized for high-side current sensing in automotive powertrain systems. It features 50 V/V fixed gain, −2 V to +65 V input common-mode voltage range, ±4.5 mV max input offset over temperature, 80 dB CMRR (dc to 20 kHz), and operates from −40°C to +125°C in an 8-lead SOIC package. It enables accurate bidirectional or unidirectional shunt-based current measurement in diesel injection controls and transmission control units.

For engineers reviewing the AD8205YRZ-RL datasheet, AD8205YRZ-RL pinout, AD8205YRZ-RL application, or AD8205YRZ-RL equivalent, key selection criteria include its guaranteed 1.2% gain accuracy over temperature, ratiometric output offset adjustment via VREF1/VREF2, survival up to +75 V common-mode transients, and qualification for automotive-grade reliability per AEC-Q100 requirements.

Technical Context

The AD8205YRZ-RL employs a two-stage amplifier architecture with precision laser-trimmed resistor networks to achieve >80 dB CMRR. Its input attenuators (1/16.7 ratio) scale high common-mode voltages into the safe input range of the first stage (A1), while A2 converts the differential output to a single-ended signal with total system gain of 50 V/V.

Output offset is programmable from 0.05 V to 4.8 V using VREF1 and VREF2 pins-enabling ground-referenced, V+-referenced, or mid-scale (ratiometric) configurations without external components. The device supports bidirectional current sensing by setting output at half-supply when VREF1 = V+ and VREF2 = GND.

Key Specifications

Pinout & Package

AD8205YRZ-RL is housed in an 8-lead SOIC_N (narrow-body) package per JEDEC MS-012-AA, with 1.27 mm pitch and 5.00 mm × 4.00 mm body dimensions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current sensing applications.

Compared with MAX4080TASA+ and INA240A1QDRQ1, the AD8205YRZ-RL uniquely combines fixed 50 V/V gain, ratiometric VREF-adjustable offset, and SOIC packaging-making it ideal for cost-sensitive, high-volume automotive current sensing where minimal BOM count and proven field reliability are prioritized.

Availability

AD8205YRZ-RL is available at Aetrix Electronics and suitable for diesel injection controls, transmission control units, H-bridge motor drives, and engine management systems requiring stable component supply across extended temperature ranges and automotive-grade traceability.

Supply support for AD8205YRZ-RL 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 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 AD8205YRZ-RL belongs to Analog Devices' precision current sensing amplifier product line, engineered specifically for robust, high-accuracy current measurement in harsh automotive environments with wide common-mode voltage swings.

FAQ

What is the maximum common-mode voltage the AD8205YRZ-RL can withstand continuously?

The AD8205YRZ-RL supports a continuous input common-mode voltage range of −2 V to +65 V. This allows direct interfacing with 42 V automotive battery systems and accommodates typical load-dump transients. Its survival rating extends to −25 V to +75 V, meeting ISO 7637-2 requirements for harsh vehicle electrical environments. The AD8205YRZ-RL maintains specified performance within the −2 V to +65 V band under all operating conditions.

How does the AD8205YRZ-RL achieve bidirectional current sensing?

The AD8205YRZ-RL achieves bidirectional current sensing by configuring its output offset to mid-scale (e.g., 2.5 V with 5 V supply) using VREF1 = V+ and VREF2 = GND. When differential input is zero, output rests at mid-rail; positive current raises output toward 4.8 V, negative current pulls it toward 0.05 V. This configuration leverages the AD8205YRZ-RL's rail-to-rail output capability and internal resistor trimming for symmetrical range allocation.

Is the AD8205YRZ-RL qualified for automotive applications?

The AD8205YRZ-RL is the commercial-grade Y version rated for −40°C to +125°C. While it shares the same die and SOIC package as the automotive-qualified AD8205WYRZ-RL (W suffix), the AD8205YRZ-RL itself is not AEC-Q100 certified. For production automotive use, specify AD8205WYRZ-RL or AD8205WHRZ-RL. The AD8205YRZ-RL remains suitable for industrial and prototyping applications requiring identical electrical performance.

What is the purpose of the NC pin on the AD8205YRZ-RL?

Pin 4 of the AD8205YRZ-RL is marked NC (No Connect) and is internally unused. It must remain unconnected-no external trace, pull-up, or pull-down is permitted. This pin has no electrical function and serves only as a mechanical placeholder in the 8-lead SOIC_N package. Connecting the NC pin risks undefined behavior or damage, as confirmed in the official AD8205 datasheet Rev. D, Page 5.

Can the AD8205YRZ-RL operate from a 3.3 V supply?

No, the AD8205YRZ-RL requires a minimum supply voltage of 4.5 V and operates up to 5.5 V. Its internal architecture-including input attenuators, biasing, and output stage-is designed for 5 V nominal operation. Attempting to run the AD8205YRZ-RL from 3.3 V will result in failure to meet specifications, including reduced output swing, degraded CMRR, and potential non-functional behavior. Use only within the 4.5 V–5.5 V range as defined in the AD8205YRZ-RL datasheet.