Texas Instruments SN7407DRE4

Overview

SN7407DRE4 from Texas Instruments is a hex buffer/driver IC with open-collector high-voltage outputs, designed for TTL-to-MOS level translation and high-current sinking (40 mA per channel) in industrial control interfaces and indicator lamp drivers. It features 30 V output breakdown voltage, 14 ns typical propagation delay, and operates from 4.75–5.25 V supply at 0–70°C.

For engineers reviewing the SN7407DRE4 datasheet, SN7407DRE4 pinout, SN7407DRE4 application, or SN7407DRE4 equivalent, this device is selected for high-voltage interfacing where sink current capability, TTL compatibility, and open-collector flexibility are required - especially in legacy industrial I/O, relay drivers, and LED matrix controllers.

Technical Context

The SN7407DRE4 implements six independent non-inverting open-collector buffers (Y = A), each capable of sinking up to 40 mA while tolerating up to 30 V on the output node. Its inputs are diode-clamped for robustness against transmission-line effects and fully compatible with standard TTL logic families.

It operates strictly as a current-sink driver: outputs present high-impedance when high and actively pull low when enabled. No internal pull-up is provided - external pull-up resistors must be used to define logic-high voltage levels, enabling flexible voltage translation across domains (e.g., 5 V logic driving 12 V or 24 V loads).

Key Specifications

Pinout & Package

SN7407DRE4 uses a 14-pin SOIC (D) package measuring 8.65 mm × 3.91 mm, with gull-wing leads and RoHS-compliant NiPdAu finish. It is moisture sensitivity level 1 (MSL-1), rated for peak reflow at 260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN7407DR and SN7406DRE4, the SN7407DRE4 uniquely combines active production status, non-inverting logic, 30 V open-collector tolerance, and 40 mA sink capability - making it the only viable choice for new commercial designs requiring TTL-compatible hex buffering with high-voltage sinking.

Availability

SN7407DRE4 is available at Aetrix Electronics and suitable for industrial control systems, LED signage controllers, and legacy interface adapters requiring stable component supply and long-term obsolescence management.

Supply support for SN7407DRE4 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.

The SN7407DRE4 belongs to TI's classic 74xx TTL-compatible logic family, engineered for robust interfacing in industrial automation, test equipment, and legacy system upgrades where reliability and long-term availability are critical.

FAQ

What is the maximum output voltage rating for SN7407DRE4?

The SN7407DRE4 has a guaranteed minimum output breakdown voltage of 30 V, meaning its open-collector outputs can safely sink current while biased up to 30 V relative to GND. This allows direct interfacing with 12 V and 24 V systems without additional level-shifting components. Exceeding 30 V risks permanent damage, and operation above this rating is not supported.

Does SN7407DRE4 include internal pull-up resistors on its outputs?

No, SN7407DRE4 does not include internal pull-up resistors. Its outputs are strictly open-collector - they can only sink current and present high impedance when inactive. An external pull-up resistor must be connected between each output (pins 2, 4, 6, 8, 12, 14) and the desired logic-high voltage rail (e.g., 5 V, 12 V, or 24 V) to establish valid HIGH states.

Can SN7407DRE4 drive multiple TTL inputs simultaneously?

Yes, SN7407DRE4 can drive multiple TTL inputs due to its 40 mA per-channel sink capability. Standard TTL loads draw ~1.6 mA per input (IIL = –1.6 mA), so a single SN7407DRE4 output can reliably drive up to 25 TTL inputs. This high fan-out makes it ideal for bus buffering and centralized control signal distribution in industrial logic systems.

Is SN7407DRE4 compatible with 3.3 V microcontrollers?

SN7407DRE4 inputs are TTL-compatible (VIH = 2.0 V min, VIL = 0.8 V max), so they accept 3.3 V logic HIGH signals directly. However, its VCC must be supplied with 4.75–5.25 V - it cannot operate from 3.3 V. For true 3.3 V–compatible open-collector buffers, consider alternatives like SN74LVC07A; SN7407DRE4 remains usable with 3.3 V GPIO as long as VCC = 5 V.

What is the thermal resistance (RθJA) of SN7407DRE4 in its SOIC package?

The SN7407DRE4 in the SOIC (D) package has a junction-to-ambient thermal resistance (RθJA) of 86.8°C/W, measured under standard JEDEC conditions (1-layer board, no copper pour). This value assumes proper PCB layout with adequate copper area and thermal vias. At 40 mA per channel and 5 V supply, total power dissipation remains low (~145 mW typical), keeping junction temperature well within safe limits at room ambient.