Texas Instruments AM26C31INS

Overview

AM26C31INS from Texas Instruments is a quadruple differential line driver IC compliant with TIA/EIA-422-B and ITU V.11 standards, delivering 7 ns typical propagation delay, 0.5 ns typical pulse skew, and 100 μA typical quiescent supply current while operating from a single 5 V supply. It serves as a high-speed, low-power interface for industrial field transmitters and motor control systems requiring robust noise immunity over twisted-pair cabling.

For engineers reviewing the AM26C31INS datasheet, AM26C31INS pinout, AM26C31INS application, or AM26C31INS equivalent, key selection criteria include differential output voltage magnitude (2–3.1 V), common-mode output voltage (3 V), high-impedance off-state behavior, dual enable logic (G and G), and compatibility with RS-422 point-to-point communication topologies.

Technical Context

The AM26C31INS implements BiCMOS circuitry to achieve both low power consumption (100 μA ICC) and high-speed performance (7 ns tPLH/tPHL). Its four independent drivers each feature complementary outputs (Y/Z), active-high (G) and active-low (G) enable inputs, and high-current capability (±150 mA short-circuit) for driving balanced transmission lines.

It supports operation across –40°C to +85°C (I-grade), meets ESD ratings of ±2000 V HBM and ±1000 V CDM, and provides high-impedance outputs during power-off conditions-critical for hot-swap and system-level fault containment in multi-node industrial networks.

Key Specifications

Pinout & Package

AM26C31INS is supplied in a 16-pin SOIC (D) package measuring 9.9 mm × 3.91 mm, with gull-wing leads and surface-mount compatibility. The device uses a standard dual-in-line footprint optimized for automated assembly and thermal dissipation in industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential line driver applications.

Compared with SN65LBC179D and AM26LS31CDR, AM26C31INS delivers superior speed-power trade-off (7 ns / 100 μA), dual-enable flexibility, and guaranteed RS-422 compliance-making it optimal for new industrial and defense designs demanding precision timing and low standby consumption.

Availability

AM26C31INS is available at Aetrix Electronics and suitable for industrial field transmitters, brushless DC motor control systems, and military radar interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AM26C31INS 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 global semiconductor leader specializing in analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The AM26C31INS belongs to TI's RS-422/RS-485 interface product line, engineered specifically for high-reliability, noise-immune digital communication in harsh electromagnetic environments such as factory automation and defense electronics.

FAQ

What is the operating temperature range for AM26C31INS?

The AM26C31INS is rated for operation from –40°C to +85°C (industrial grade), validated per manufacturer specifications. This range supports deployment in uncontrolled industrial enclosures, outdoor sensor housings, and vehicle-mounted control units without thermal derating. The device maintains full electrical performance-including 7 ns propagation delay and 2 V minimum differential output swing-across this entire span.

Does AM26C31INS support true RS-422 compliance?

Yes, AM26C31INS explicitly meets or exceeds TIA/EIA-422-B and ITU V.11 standards, as confirmed in its official datasheet features and electrical characteristics. It delivers ≥2 V differential output voltage into 100 Ω loads, supports ≥±7 V differential input voltage, and guarantees timing parameters (e.g., 0.5 ns pulse skew) required for interoperability with certified RS-422 receivers like AM26C32INS.

How does the dual-enable logic (G and G) function in AM26C31INS?

In AM26C31INS, the G pin is active-high and the G pin is active-low; asserting either enables all four drivers simultaneously. This dual-input arrangement eliminates the need for external inverters when interfacing with controllers offering only one enable polarity. When both are deasserted, all outputs enter high-impedance state-critical for bus sharing and hot-swap safety in modular systems.

What is the maximum data rate supported by AM26C31INS?

While AM26C31INS does not specify a formal "data rate" limit, its 7 ns typical propagation delay and 5 ns typical differential rise/fall times support reliable operation up to approximately 70 Mbps on properly terminated 100 Ω twisted-pair lines. Actual achievable rate depends on cable length, termination quality, and noise environment-designs exceeding 10 Mbps require careful layout per TI's application note SLLA035.

Can AM26C31INS be used in hot-swap applications?

Yes, AM26C31INS is designed for hot-swap use: its outputs enter high-impedance state when VCC = 0 V, preventing back-driving of live buses. Measured IO(off) is ±100 μA at VO = ±0.25 V, confirming safe isolation. For full system-level hot-swap robustness, combine with TVS diodes and current-limiting resistors per TI's layout guidelines in section 8.4.