Texas Instruments 7603901FA

Overview

7603901FA from Texas Instruments is a retriggerable monostable multivibrator IC in ceramic flatpack (CFP) package with 16 terminals, operating across -55°C to +125°C, featuring dual independent monostable circuits with external timing control via RC networks and TTL-compatible inputs/outputs. It is used in precision pulse generation, debouncing, and delay timing within military-grade digital systems.

For engineers reviewing the 7603901FA datasheet, 7603901FA pinout, 7603901FA application, or 7603901FA equivalent, this device supports retriggerable one-shot operation with guaranteed propagation delay (t_PLH/t_PHL ≤ 45 ns at V_CC = 5 V), stable temperature performance, and QML-qualified reliability for aerospace and defense designs.

Technical Context

The 7603901FA implements two identical retriggerable monostable multivibrators, each with separate A and B trigger inputs, Q and Q̅ outputs, and R_EXT/C_EXT timing terminals. Its TTL-compatible input thresholds and output drive capability (I_OH/I_OL = ±0.4 mA / ±8 mA) ensure interoperability with legacy 74LS and 54-series logic families.

Timing duration is externally set by resistor-capacitor networks connected to pins 6–7 and 13–14, with nominal output pulse width t_W ≈ 0.33 × R × C. The device maintains functional stability over full military temperature range (-55°C to +125°C) and meets MIL-PRF-38535 Class V requirements.

Key Specifications

Pinout & Package

7603901FA uses a 16-pin ceramic flatpack (CFP) package per TI drawing W, with gull-wing leads and hermetic ceramic body. Pin numbering follows standard dual-inline orientation with Pin 1 at top-left corner when viewed from top with marking side up.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar retriggerable monostable multivibrator applications.

Compared with SNJ54LS123W and JM38510/31401BFA, the 7603901FA offers identical timing performance and military qualification at optimized cost for terrestrial defense platforms, with no PCB changes needed when substituting among these three CFP-packaged variants.

Availability

7603901FA is available at Aetrix Electronics and suitable for avionics timing control, radar pulse gating, and missile guidance logic requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7603901FA 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 manufacturer founded in 1930, specializing in analog, embedded processing, and high-reliability logic products for industrial, automotive, and defense markets.

The 7603901FA belongs to TI's military logic family derived from the classic 74LS123 architecture, designed specifically for retriggerable timing in mission-critical systems where environmental robustness and long-term obsolescence mitigation are essential.

FAQ

What is the maximum operating temperature range for the 7603901FA?

The 7603901FA operates reliably from -55°C to +125°C, as confirmed by its QML-38535 Class V qualification and packaging in hermetic ceramic flatpack (CFP). This range is validated per MIL-STD-883 test methods and applies across all electrical parameters specified in the SDLS043 datasheet. The 7603901FA maintains timing accuracy and output drive integrity throughout this full military temperature span without derating.

Is the 7603901FA pin-compatible with commercial SN74LS123 variants?

No - the 7603901FA uses a 16-pin CFP (drawing W) package, whereas commercial SN74LS123 variants use PDIP (N), SOIC (D), or SSOP (DB) packages with different pinouts and thermal/mechanical characteristics. While logic function and electrical behavior match the SN74LS123 specification, physical compatibility requires redesign for CFP footprint and solder profile. The 7603901FA is pin-compatible only with other CFP-packaged variants like SNJ54LS123W and JM38510/31401BFA.

Does the 7603901FA support non-retriggerable mode?

No - the 7603901FA is exclusively a retriggerable monostable multivibrator. Its internal architecture lacks provision for non-retriggerable (edge-triggered only) operation. If non-retriggerable behavior is required, external gating logic or a different device such as the SN74LS122 must be used. The 7603901FA's retriggerable design is fixed and cannot be disabled or configured otherwise.

What are the recommended external timing components for a 1 µs output pulse with the 7603901FA?

To achieve a nominal 1 µs output pulse width (t_W ≈ 0.33 × R × C), use R_EXT = 1 kΩ and C_EXT = 330 pF. These values account for typical parasitic capacitance and ensure stable oscillation-free timing. TI's SDLS043 datasheet specifies minimum R_EXT ≥ 1 kΩ and C_EXT ≥ 100 pF; the 7603901FA has been validated with this combination across -55°C to +125°C with <±5% pulse width variation.

How does the 7603901FA differ from the SN54LS123J variant?

The 7603901FA and SN54LS123J share identical logic function, electrical specifications, and military temperature range (-55°C to +125°C), but differ in package and qualification: 7603901FA uses CFP (W) packaging and is QML-38535 Class V qualified, while SN54LS123J uses CDIP (J) packaging and carries a different DLA-assigned part number. Both are manufactured by Texas Instruments and meet the same SDLS043 specification, but 7603901FA reflects updated process and screening documentation under the 5962-7603901 series.