Texas Instruments SN74AS153NSR

Overview

SN74AS153NSR from Texas Instruments is a dual 1-of-4 data selector/multiplexer IC used for binary-decoded signal routing in digital logic systems. It features two independent 4-input multiplexers with shared select lines (A, B), individual strobe inputs (1G, 2G), and complementary outputs (1Y, 2Y). Operates at 4.5–5.5 V, delivers ±48 mA output drive, and supports 0°C to 70°C industrial temperature range - ideal for address/data bus switching in legacy TTL-compatible control logic.

For engineers reviewing the SN74AS153NSR datasheet, SN74AS153NSR pinout, SN74AS153NSR application, or SN74AS153NSR equivalent, this page provides verified functional specifications, SOP-16 package layout, real-world timing performance (tPLH/tPHL ≤ 12.5 ns), and validated drop-in alternatives for logic design continuity and obsolescence mitigation.

Technical Context

The SN74AS153NSR implements two independent AND-OR-gate-based multiplexers with full binary decoding via internal inverters and drivers. Select inputs A and B are common to both sections, enabling synchronized channel selection across dual paths without external logic.

Each section has dedicated active-low strobe (G) inputs that gate output enablement independently; when G is high, the corresponding Y output is forced low regardless of data or select states. This supports cascading n-line-to-n-line configurations and parallel-to-serial conversion through controlled gating.

Key Specifications

Pinout & Package

SOP-16 (NS) package: 16-pin small-outline plastic package with gull-wing leads, 1.27 mm pitch, 10.4 mm × 5.3 mm body size, maximum height 2.00 mm. Pin 1 marked by beveled corner or notch; tape-and-reel delivery (2000 pcs/reel), Q1 quadrant orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4:1 multiplexer applications.

Compared with SN74AS153NSR, SN74ALS153NSR trades speed and drive strength for lower power, while SN74F153N offers superior speed but lacks surface-mount availability - making SN74AS153NSR the optimal balance of performance, package modernity, and production readiness.

Availability

SN74AS153NSR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy system bus multiplexing, and test equipment signal routing requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for SN74AS153NSR 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.

The SN74AS153NSR belongs to TI's 74AS advanced Schottky TTL logic family, designed for high-speed, low-noise digital control in commercial and industrial systems where reliability and timing precision are critical.

FAQ

What is the maximum clock frequency supported by SN74AS153NSR in multiplexing applications?

The SN74AS153NSR does not operate on a clock signal - it is combinational logic. Its usable data rate depends on propagation delay and system timing margins. With tPHL/tPLH ≤ 12.5 ns and setup/hold times < 5 ns, it reliably supports synchronous multiplexing up to approximately 40 MHz in well-terminated 50 pF load conditions, assuming clean edge rates and proper power integrity.

Can SN74AS153NSR drive 74LS-series inputs directly without pull-up resistors?

Yes. The SN74AS153NSR provides 48 mA sink current and −15 mA source current, exceeding the 74LS input requirements (IIL = −0.4 mA, IIH = 20 µA). Its VOL ≤ 0.5 V at 48 mA ensures valid LOW recognition, and VOH ≥ 2.4 V at −15 mA guarantees solid HIGH levels - eliminating need for external pull-ups in standard 74LS interfacing.

Is SN74AS153NSR pin-compatible with SN74ALS153NSR?

Yes. Both SN74AS153NSR and SN74ALS153NSR use identical SOP-16 (NS) packages with identical pinouts, including shared A/B select lines, independent 1G/2G strobes, dual C0–C3 data inputs, and 1Y/2Y outputs. They are functionally interchangeable at the board level, though timing and drive differences require verification in timing-critical designs.

Does SN74AS153NSR support hot insertion or live insertion into powered systems?

No. SN74AS153NSR is not designed for hot-plug operation. Its absolute maximum ratings specify no input voltage beyond VCC + 0.5 V, and it lacks bus-hold or Ioff protection. Applying signals before VCC stabilization risks latch-up or permanent damage. Power sequencing - VCC first, then inputs - is mandatory per TI's recommended operating conditions.

What is the thermal resistance (θJA) of SN74AS153NSR in SOP-16 package?

Texas Instruments does not publish θJA for SN74AS153NSR in the SDAS206A datasheet. However, based on TI's standard SOP-16 (NS) thermal characterization for similar AS-family devices, typical θJA is 110°C/W on 1-inch² 2-layer JEDEC test board. For precise thermal design, users should refer to TI's "Thermal Metrics" application report SPRA953 and validate with actual board layout and copper pour.