Texas Instruments TL322CDR

Overview

TL322CDR from Texas Instruments is a dual general-purpose operational amplifier with true differential input stage, Class AB output stage, and internal frequency compensation. It operates from single supply (5 V to 30 V) or dual supplies (±2.5 V to ±15 V), delivers ±10 V peak output swing into 2 kΩ at ±15 V, and features low input bias current (−0.2 µA typ) and 1 MHz unity-gain bandwidth - used in industrial sensor signal conditioning and analog front-end circuits.

For engineers reviewing the TL322CDR datasheet, TL322CDR pinout, TL322CDR application, or TL322CDR equivalent, key selection criteria include input offset voltage (2–10 mV), common-mode input range extending to VCC−, output swing to within 1.5 V of VCC+, supply current (1.4–4 mA per amplifier), and −40°C to 85°C operation for the TL322I variant - all critical for precision DC-coupled amplification in legacy and cost-sensitive designs.

Technical Context

The TL322CDR implements a classic bipolar-input op-amp architecture with a dedicated common-bias circuitry shared between both amplifiers, enabling stable quiescent current control across temperature and supply variations. Its differential input stage supports rail-to-rail common-mode input down to VCC−, while the Class AB output stage ensures low crossover distortion (1% typical) and ±45 mA short-circuit output current capability.

Internal 5 pF compensation provides unity-gain stability without external components, and the device maintains ≥60° phase margin with 2 kΩ load and 200 pF capacitive load. The design excludes rail-to-rail output - maximum swing is VCC+ −1.5 V and VCC− - and does not support true single-supply rail-to-rail input/output operation.

Key Specifications

Pinout & Package

TL322CDR is supplied in an 8-pin SOIC (Small Outline Integrated Circuit) package, designated "D" package per TI documentation, with tape-and-reel packaging indicated by the "R" suffix. Dimensions conform to JEDEC MS-012 standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual operational amplifier applications.

Compared with LM358DR and TL072CDR, TL322CDR uniquely balances wide supply flexibility (5 V to 30 V single / ±2.5 V to ±15 V dual), VCC−-inclusive input range, and proven reliability in legacy industrial systems - making it the preferred choice where compatibility, robustness, and DC accuracy outweigh ultra-low noise or high-speed requirements.

Availability

TL322CDR is available at Aetrix Electronics and suitable for industrial sensor interfaces, legacy equipment repair, DC motor control feedback loops, and audio pre-amplification requiring stable component supply across extended temperature and voltage ranges.

Supply support for TL322CDR 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

Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog ICs, embedded processors, and high-reliability components for industrial, automotive, and communications markets.

The TL322 series belongs to TI's legacy general-purpose op-amp product line, designed specifically for robust, cost-effective replacement of uA741 in industrial control, instrumentation, and analog signal conditioning applications requiring wide supply range and stable DC performance.

FAQ

What is the operating temperature range for TL322CDR?

The TL322CDR is the commercial-grade version of the TL322 dual op-amp, characterized for operation from 0°C to 70°C. This range is explicitly defined in the SLOS086 datasheet for the TL322C variant, and the "R" suffix denotes tape-and-reel packaging - not an extended temperature grade. For industrial temperature range (−40°C to 85°C), the TL322ID or TL322IP would be required, but TL322CDR itself is rated only for 0°C to 70°C.

Does TL322CDR support true rail-to-rail input or output?

No, TL322CDR does not support rail-to-rail input or output. Its common-mode input range extends to VCC− but stops 2 V below VCC+, and its output swing reaches only to VCC+ −1.5 V and VCC− under load. These limitations are specified in the "Recommended Operating Conditions" and "Electrical Characteristics" tables of the SLOS086 datasheet - confirming TL322CDR is a conventional bipolar op-amp, not a rail-to-rail device.

Is TL322CDR pin-compatible with the uA741 or LM358?

TL322CDR is not pin-compatible with the uA741 (8-pin DIP, different pinout) or LM358 (8-pin SOIC/DIP, but pin 1 is output, not 1OUT as in TL322). The TL322CDR uses a standard dual-op-amp SOIC-8 pinout: pins 1/7 = outputs, 2/3/5/6 = inputs, 4 = VCC−/GND, 8 = VCC+. While functionally similar to both, physical pin mapping differs - direct replacement requires PCB modification unless using adapter footprints or socketed carriers.

What is the maximum capacitive load TL322CDR can drive stably?

TL322CDR maintains ≥60° phase margin with a 200 pF capacitive load when driving a 2 kΩ resistive load, as verified in the "Electrical Characteristics" table under Phase Margin (φm) test condition CL = 200 pF. Driving larger capacitive loads (e.g., >500 pF) risks instability and peaking; for heavier loads, external isolation resistance (e.g., 100 Ω in series with output) is recommended per TI application guidance in SLOS086.

Can TL322CDR operate from a single 3.3 V supply?

No, TL322CDR cannot operate reliably from a single 3.3 V supply. The datasheet specifies a minimum single-supply voltage of 5 V, and absolute maximum ratings define VCC+ as 18 V (with VCC− = 0 V). At 3.3 V, internal transistor biasing fails - resulting in severely degraded gain, output swing, and input common-mode range. For 3.3 V systems, modern rail-to-rail op-amps like TLV2462 or MCP6022 are appropriate alternatives.