SN74LS07DRE4 - Hex Buffer Open-Collector 30V | TI
MPN: SN74LS07DRE4 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.31 | $0.31 |
| 10 | $0.25 | $2.50 |
| 100 | $0.19 | $19.00 |
| 500 | $0.16 | $80.00 |
| 1,000 | $0.12 | $120.00 |
SN74LS07DRE4 Overview
A buffer/driver is a logic element that isolates signal sources from loads and provides the current drive capability that standard logic outputs often lack. Within the power-management and interface hierarchy, buffers bridge low-power digital controllers and higher-current loads such as LEDs, relays, motors and high-level logic families. Open-collector buffers are a special class: the output transistor can only sink current, so the logic-high level is set by an external pull-up resistor, allowing level shifting between different voltage domains.
Key features of the SN74LS07 include a rated output voltage of 30 V on the open-collector stage, a maximum sink current of 40 mA per output, six independent non-inverting elements in one package, and classic Low-Power Schottky (LS) TTL bipolar technology. The DRE4 ordering suffix denotes the 14-SOIC package in tape-and-reel packaging for automated assembly.
Technically, the bipolar LS architecture provides fast switching with robust noise margins and rugged open-collector outputs suited for driving heavy loads. Because outputs are open-collector, they support wired-AND configurations where multiple outputs share a pull-up, a common technique for shared interrupt or status lines.
Typical applications include driving high-current LED indicators, interfacing 5 V logic to high-level circuits up to 30 V, relay and solenoid drive, and TTL input buffering in industrial control panels.
Design consideration: always provide a pull-up resistor to the desired high-level voltage; the open-collector output cannot source current, and the pull-up value trades speed against sink current.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for SN74LS07DRE4 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN74LS07DR
β Drop-Inβ In Stock
$0.19 / Unit
View Datasheet βSN74LS07DRG4
β Drop-Inπ Reference alternative (not in catalog)
SN74LS07DE4
β Drop-Inπ Reference alternative (not in catalog)
SN74LS07DG4
β Drop-Inπ Reference alternative (not in catalog)
SN74LS07D
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
SN74LS07DRE4 Maximum Ratings & Electrical Characteristics
| Logic Function | Hex non-inverting buffer/driver |
| Number of Elements | 6 |
| Bits per Element | 1 |
| Output Type | Open-collector |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Rated Output Voltage | 30 V |
| Maximum Sink Current | 40 mA |
| Technology Family | LS (Low-Power Schottky TTL) |
| Polarity | Non-inverting |
| Package | 14-SOIC (D) |
| Mounting Type | Surface Mount |
| Operating Temperature | 0C to 70C |
| Packaging | Tape & Reel (DRE4) |
| RoHS Status | Compliant |
| Application | Buffer for driving TTL inputs; high-level interface circuits; high-current load drive |
SN74LS07DRE4 Pin Configuration
| Pin 1 | 1A β Buffer 1 input |
| Pin 2 | 1Y β Buffer 1 open-collector output (30 V) |
| Pin 3 | 2A β Buffer 2 input |
| Pin 4 | 2Y β Buffer 2 open-collector output (30 V) |
| Pin 5 | 3A β Buffer 3 input |
| Pin 6 | 3Y β Buffer 3 open-collector output (30 V) |
| Pin 7 | GND β Ground |
| Pin 8 | 4Y β Buffer 4 open-collector output (30 V) |
| Pin 9 | 4A β Buffer 4 input |
| Pin 10 | 5Y β Buffer 5 open-collector output (30 V) |
| Pin 11 | 5A β Buffer 5 input |
| Pin 12 | 6Y β Buffer 6 open-collector output (30 V) |
| Pin 13 | 6A β Buffer 6 input |
| Pin 14 | VCC β Supply voltage, 4.75 V to 5.25 V |
Typical Applications
SN74LS07DRE4 is suitable for 6 applications: High-Level Circuit Interface, LED Display and Indicator Driving, Relay and Solenoid Drive, TTL Input Buffering, Wired-AND Shared Status Lines, Microcontroller Port Expansion to 24V Systems.
High-Level Circuit Interface
The SN74LS07DRE4 was designed specifically to interface 5 V TTL logic with high-level circuits, thanks to its 30 V rated open-collector outputs. A controller output at 5 V logic levels can safely drive loads referenced to rails as high as 30 V because the buffer output transistor only sinks current. Placing a pull-up resistor from the output to the high-level rail sets the logic-high voltage, allowing a 5 V microcontroller port to signal 24 V industrial I/O modules or legacy high-threshold circuits. The key performance consideration is pull-up sizing: smaller resistors switch faster but burn more power when the output is low, so designers typically choose 1-10 kilohms depending on speed and dissipation budgets.
Recommended
LED Display and Indicator Driving
With 40 mA sink capability per output and six independent channels, the SN74LS07DRE4 can directly drive high-current LEDs or LED segments that standard logic outputs cannot handle. The LED anode connects to a current-limited supply and the cathode to the buffer output; when the input goes high, the non-inverting buffer pulls the output low and the LED illuminates. This topology suits status indicators, numeric display segments, and panel lamps in test equipment. The open-collector structure permits LEDs on a different voltage rail than the IC supply, useful when mixing red/amber 5 V indicators with 12 V or 24 V panel lighting. A series resistor per LED is still required to limit current below the 40 mA rating.
Recommended
Relay and Solenoid Drive
The SN74LS07DRE4 serves as the interface stage between low-power logic and relay or solenoid coils when paired with a suitable external driver transistor. While its 40 mA sink current is too low for most coil currents directly, it robustly drives the base or gate of a power transistor, and its 30 V output rating tolerates inductive kickback transients that would destroy ordinary logic outputs. In industrial control panels, each of the six buffers can command one relay channel with a series base resistor, providing electrical isolation of the logic rail. A flyback diode across each coil remains mandatory; the 30 V open-collector rating absorbs residual spikes but does not replace proper inductive clamping.
Recommended
TTL Input Buffering
TI characterizes the SN74LS07 explicitly for use as a buffer driving TTL inputs, making it valuable where a weak signal source must fan out to multiple logic loads. One buffer output can sink the combined low-level input currents of several TTL gates while presenting a clean defined high level through its pull-up. This application suits clock or control-signal distribution on 5 V TTL backplanes, test fixtures, and legacy industrial boards. Because the device is non-inverting, the signal polarity is preserved, simplifying timing analysis versus inverting buffers. Designers should verify the pull-up value provides adequate rise time at the intended clock rate, as open-collector edges are RC-limited by the pull-up and line capacitance.
Recommended
Wired-AND Shared Status Lines
Open-collector outputs of the SN74LS07DRE4 can be tied together on a single pull-up resistor, creating a wired-AND bus where any buffer pulling low forces the shared line low. This is the classic implementation for shared interrupt, fault, or status lines in multi-board systems: each board drives one buffer input, and the common line signals whether any board is asserting a condition. The 30 V rating allows the shared bus to run at a higher rail than board logic, and the open-collector structure eliminates the bus contention that would occur with totem-pole outputs. Pull-up resistance must account for the total low-level sink current of all asserting outputs and bus capacitance for edge speed.
Recommended
Microcontroller Port Expansion to 24V Systems
In mixed-voltage embedded systems, the SN74LS07DRE4 converts 3.3 V or 5 V microcontroller GPIO signals to 12 V or 24 V domains. The LS TTL input thresholds accept standard logic drive, and each open-collector output can pull a 24 V pull-up rail, enabling direct signaling to PLC inputs, industrial sensors, and 24 V alarm loops. The DRE4 tape-and-reel format supports automated assembly for volume controller boards. Performance considerations include respecting the 40 mA sink limit per channel and allowing output rise time governed by the pull-up resistor and cable capacitance - for long cable runs, larger pull-up currents or external line drivers may be needed to maintain signal integrity.
Recommended
Recommended Products Summary
Engineering reference data for SN74LS07DRE4 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74LS07DR | SN74LS07DRG4 | SN74LS07DE4 | SN74LS07DG4 |
|---|---|---|---|---|---|
| Package | 14-SOIC (D) | 14-SOIC (D) - same | 14-SOIC (D) - same | 14-SOIC (D) - same | 14-SOIC (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Voltage Rating | 30 V | 30 V | 30 V | 30 V | 30 V |
| Maximum Sink Current | 40 mA | 40 mA | 40 mA | 40 mA | 40 mA |
| Supply Voltage | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V |
| Channels / Polarity | 6 ch, non-inverting | 6 ch, non-inverting | 6 ch, non-inverting | 6 ch, non-inverting | 6 ch, non-inverting |
| Packaging | Tape & Reel (DRE4) | Tape & Reel | Tape & Reel | Tube | Tube |
| Temperature Range | 0C to 70C | 0C to 70C | 0C to 70C | 0C to 70C | 0C to 70C |
Key Differentiators
- Identical die at current ordering code (vs SN74LS07DR)
- 30 V open-collector outputs exceed most CMOS logic buffers (vs SN74LS07DE4)
- Tube packaging option for prototyping (vs SN74LS07DG4)
Design Notes
The most common SN74LS07 design error is omitting the pull-up resistor. Open-collector outputs cannot source current, so an output left without a pull-up floats and never presents a valid logic high. Always connect a pull-up from each output to the desired high-level rail (which may be up to 30 V and need not equal VCC). A second pitfall: do not exceed 40 mA sink current per output. Estimated: with a 5 V pull-up and a 100-ohm pull-up resistor, sinking current reaches about 50 mA, exceeding the rating - use at least 150 ohms at 5 V, or a higher value for headroom.
Power dissipation is dominated by pull-up resistor current when outputs are low. Estimated: six outputs each sinking 16 mA from a 24 V rail through 1.5-kilohm pull-ups dissipate roughly 0.38 W total across the resistors (not the IC), while the IC itself dissipates the output saturation voltage times sink current, on the order of a few hundred milliwatts worst case. Keep the output saturation voltage (typically under 0.7 V at rated current per LS-family characteristics) in mind and verify total board thermal budget. Choose pull-up values trading bus rise time (RC with bus capacitance) against continuous low-state current draw.
Place a 0.1-uF ceramic decoupling capacitor close to the VCC pin (pin 14) with a solid connection to GND (pin 7), especially when the open-collector outputs sink fast load-current transitions; the sinking transients couple into the supply rail. Route high-current load paths (LED, relay driver returns) away from the LS input traces to protect TTL input noise margins. For wired-AND buses, keep the shared trace short and consider a small capacitor-free layout with consistent pull-up placement to preserve edge symmetry across the bus.
Open-collector output edges are RC-limited: rise time equals approximately pull-up resistance times total node capacitance. Estimated: a 4.7-kilohm pull-up with 100 pF of bus capacitance gives a 0.47-microsecond rise-time constant - too slow for fast clock distribution but fine for status lines. For clock buffering, use lower pull-up values (470 ohms to 1 kilohm, watching sink current against the 40 mA limit) or select a totem-pole output buffer instead. Verify VIL/VIH TTL input thresholds on receiving devices when level shifting between rails.
Compliance Information
The E4 suffix in TI ordering codes denotes lead-free, RoHS-compliant assembly. REACH and conflict-minerals status not stated in provided data.
