Texas Instruments SN7407DRG4

Overview

SN7407DRG4 from Texas Instruments is a hex buffer/driver IC with six independent open-collector outputs, designed for TTL-to-MOS level translation and high-current sinking (40 mA per channel) into high-voltage loads up to 30 V. It operates from 4.75–5.25 V at 0–70°C and delivers 14 ns typical propagation delay, making it suitable for driving indicator lamps, relays, and bus interface circuits in consumer audio docks and solid-state drives.

For engineers reviewing the SN7407DRG4 datasheet, SN7407DRG4 pinout, SN7407DRG4 application, or SN7407DRG4 equivalent, key selection criteria include its 30 V output breakdown rating, 40 mA sink capability per channel, SOIC-14 package compatibility, and TTL-input/CMOS-output interfacing function in level-shifting and load-driving roles.

Technical Context

The SN7407DRG4 implements six identical non-inverting open-collector buffers with diode-clamped TTL-compatible inputs and high-voltage tolerant outputs. Each channel sinks current only-no active pull-up-requiring external pull-up resistors for logic-high assertion.

Its functional behavior follows Y = A (positive logic), with input thresholds of VIH ≥ 2 V and VIL ≤ 0.8 V, and guaranteed VOL ≤ 0.7 V at IOL = 40 mA. The device exhibits typical power dissipation of 145 mW and junction-to-ambient thermal resistance of 86.8°C/W in SOIC-14 packaging.

Key Specifications

Pinout & Package

SN7407DRG4 is housed in a 14-pin SOIC (D) package measuring 8.65 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and RoHS-compliant NiPdAu lead finish. Pin 1 is located at the top-left corner (Q1 quadrant) when viewed from the top with the marking side up and notch or dot oriented left.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex open-collector buffer applications.

Compared with SN7407N and SN7417DR, SN7407DRG4 uniquely combines 30 V output tolerance, SOIC-14 surface-mount compatibility, and production-ready tape-and-reel packaging-making it optimal for volume-manufactured 24 V industrial interfaces requiring robust level translation.

Availability

SN7407DRG4 is available at Aetrix Electronics and suitable for industrial control I/O expansion, LED status panels, legacy bus interface translation, and SSD power sequencing control requiring stable component supply across multi-year production cycles.

Supply support for SN7407DRG4 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 logic solutions, with over 50 years of innovation in industrial, automotive, and communications markets.

SN7407DRG4 belongs to TI's classic 74xx logic family, engineered for robust level translation and high-current drive in legacy and mixed-voltage digital systems where reliability and interoperability with older standards are critical.

FAQ

What is the maximum output voltage rating of the SN7407DRG4?

The SN7407DRG4 has a guaranteed minimum output breakdown voltage of 30 V, meaning each open-collector output can safely withstand up to 30 V when in the high-impedance (off) state. This rating is confirmed in Section 6.1 Absolute Maximum Ratings and Section 8.3 Feature Description of the SDLS032H datasheet. Exceeding this voltage risks permanent damage to the output transistor. The SN7407DRG4 must always be used with appropriate external pull-up resistors sized to limit current within the 40 mA per-channel sink limit.

Can the SN7407DRG4 operate from a 3.3 V supply?

No, the SN7407DRG4 cannot operate reliably from a 3.3 V supply. Its Recommended Operating Conditions specify a VCC range of 4.75–5.25 V only. At 3.3 V, input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) may not be met consistently, and output saturation voltage (VOL) rises significantly above specification-exceeding 0.7 V at full 40 mA load. Using SN7407DRG4 outside its rated supply range violates TI's published specifications and compromises timing, noise immunity, and drive strength. For 3.3 V systems, consider logic-level translators like TXB0108 or dedicated 3.3 V–tolerant buffers.

How many unused inputs must be terminated on the SN7407DRG4, and how?

All six inputs (pins 1, 3, 5, 9, 11, 13) of the SN7407DRG4 must be actively terminated-either to VCC or GND-if not driven by a signal source. Floating TTL inputs cause undefined output states, increased power consumption, and potential oscillation due to internal diode clamping effects. TI explicitly states in Section 11.1 Layout Guidelines that "all unused inputs of digital logic devices must be connected to a high or low bias." For SN7407DRG4, tie unused inputs directly to VCC (for logic-high default) or GND (for logic-low default) using short traces; avoid pull-up/pull-down resistors unless signal integrity analysis indicates risk of noise coupling.

Is the SN7407DRG4 pin-compatible with the SN7417DR?

Yes, the SN7407DRG4 and SN7417DR are fully pin-compatible and share identical SOIC-14 (D) package dimensions, pin numbering, and pin functions-including VCC (pin 14), GND (pin 7), and all six input/output pairs. Both devices have the same 14 ns typical propagation delay and 4.75–5.25 V supply range. The sole functional difference is maximum output voltage: SN7407DRG4 supports 30 V, while SN7417DR is rated for 15 V. No PCB layout changes are needed when substituting between them, though system-level voltage margin verification is required after replacement.

What is the thermal performance of the SN7407DRG4 in SOIC-14 package?

In its SOIC-14 (D) package, the SN7407DRG4 has a junction-to-ambient thermal resistance (RθJA) of 86.8°C/W under standard JEDEC test conditions (1s pulse, 1-layer board). Its junction-to-board (RθJB) is 41°C/W, indicating effective heat conduction into the PCB copper. These values assume proper layout: 1 oz copper, 1 in² exposed pad area, and a 0.1 µF bypass capacitor placed within 3 mm of VCC pin. Under worst-case 40 mA sink per channel (6 channels × 40 mA = 240 mA total IOL), power dissipation reaches ~1.2 W, raising junction temperature ~104°C above ambient-necessitating derating or airflow in sustained high-load operation. The SN7407DRG4 is not rated for continuous 100% channel utilization at 70°C ambient without thermal mitigation.