SN74LS07DR - Hex Buffer/Driver OC 30V 40mA | Texas Instruments
MPN: SN74LS07DR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.42 | $0.42 |
| 10 | $0.36 | $3.60 |
| 100 | $0.29 | $29.00 |
| 500 | $0.24 | $120.00 |
| 1,000 | $0.19 | $190.00 |
SN74LS07DR Overview
A buffer/driver is a logic element that isolates and amplifies digital signals so a low-power logic output can drive heavier loads, longer buses, or circuits operating at different voltage levels. Buffers and drivers sit within the broader hierarchy of logic ICs, which spans gates, flip-flops, registers, and bus interface devices in standard 7400 TTL and CMOS families.
Key features include open-collector outputs that interface directly with high-level circuits such as MOS gates, indicator lamps, and relays; a strong 40 mA sink-current capability well beyond standard TTL outputs; input clamping diodes that simplify system design by suppressing negative-going line transients; and operation as a straight-through non-inverting buffer for driving TTL inputs. These characteristics make it a classic choice for logic-to-power interfacing.
Architecturally, the SN74LS07 is a bipolar LS-TTL device. Each of the six channels is a single transistor with its collector open at the package pin, so no output-high voltage is driven internally; instead, an external pull-up resistor to any voltage up to 30 V defines the logic-high level. This permits conversion of 5 V TTL logic levels to MOS levels, wire-AND logic combining, and driving of lamps or relays with the external pull-up sized for the load current.
Typical applications include driving LED indicators and relays from microcontroller or TTL outputs, level shifting between 5 V logic and higher-voltage MOS circuits, implementing wire-AND/wire-OR bus lines on shared nodes, and general TTL buffering in industrial control panels and test fixtures.
In design, always provide an external pull-up resistor on every output, sized so the sink current stays below 40 mA and the pull-up dissipation is acceptable; do not use this part where an active drive-high output is required.
This page synthesizes verified distributor data, drop-in alternatives, pinout, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for SN74LS07DR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with SN74LS07DR (same form factor and footprint) β differing in Operating Temperature, Package, Packaging.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN74LS06DR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
SN74HC07DR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
SN74LVC07ADR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
SN74LS07DR Maximum Ratings & Electrical Characteristics
| Logic Function | Hex non-inverting buffer/driver |
| Number of Channels | 6 |
| Output Type | Open-collector |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Rated Output Voltage | 30 V |
| Maximum Sink Current | 40 mA |
| Input Clamping Diodes | Yes |
| Polarity | Non-inverting |
| Logic Family | LS TTL (74LS) |
| Operating Temperature | 0 C to 70 C |
| Package | SOIC (D), 14 pins |
| Mounting Type | Surface Mount |
| Packaging | Tape and Reel (R suffix) |
SN74LS07DR Pin Configuration
| Pin 1 | 1A β Channel 1 input |
| Pin 2 | 1Y β Channel 1 open-collector output |
| Pin 3 | 2A β Channel 2 input |
| Pin 4 | 2Y β Channel 2 open-collector output |
| Pin 5 | 3A β Channel 3 input |
| Pin 6 | 3Y β Channel 3 open-collector output |
| Pin 7 | GND β Ground |
| Pin 8 | 4Y β Channel 4 open-collector output |
| Pin 9 | 4A β Channel 4 input |
| Pin 10 | 5Y β Channel 5 open-collector output |
| Pin 11 | 5A β Channel 5 input |
| Pin 12 | 6Y β Channel 6 open-collector output |
| Pin 13 | 6A β Channel 6 input |
| Pin 14 | VCC β Supply voltage, 4.75 V to 5.25 V |
Typical Applications
SN74LS07DR is suitable for 6 applications: Relay and Lamp Driving in Industrial Control, TTL to MOS Level Translation, Wire-AND Shared Bus Lines, LED Indicator and Display Segments, TTL Buffering for Test Fixtures, Microcontroller GPIO Fan-Out and Isolation.
Relay and Lamp Driving in Industrial Control
Industrial control panels frequently need to switch relays, solenoid indicator lamps, and annunciators from 5 V TTL or microcontroller logic, and the SN74LS07DR is purpose-built for this role. Its open-collector outputs sink up to 40 mA each at a 30 V rating, so small relays and LED or filament indicators can be driven directly: the load ties to the external supply, and the LS07 output pulls the return to ground when active. Input clamping diodes protect against negative transients from long panel wiring. Designers must add flyback diodes across inductive coils and size pull-up/load resistors so per-channel sink current stays below 40 mA, but the six channels per SOIC-14 package keep panel driver circuitry compact and low-cost.
Recommended
TTL to MOS Level Translation
Converting 5 V TTL logic levels to MOS levels is one of the classic documented uses of the SN74LS07. Many power MOSFET gate drivers, high-voltage display drivers, and legacy NMOS circuits expect logic swings higher than 5 V or referenced to different rails. The open-collector output of the SN74LS07DR lets each node be pulled up to any voltage up to 30 V, so a 5 V logic signal can be re-referenced to a 12 V, 15 V, or 24 V domain with a single resistor per channel. With six independent buffers in one 14-pin SOIC, multi-signal interfaces translate in one device, and the LS-TTL input thresholds accept standard 5 V logic outputs directly.
Recommended
Wire-AND Shared Bus Lines
Because open-collector outputs never actively drive high, multiple SN74LS07DR outputs can be tied to a single pull-up resistor to create wire-AND logic: the node is high only if all outputs are off. This is widely used for shared interrupt lines, ready/enable buses, alarm combining, and legacy backplane handshake signals where several boards must share one line without bus contention. The 30 V off-state rating and 40 mA sink capability give generous margin on noisy industrial buses, and one shared resistor defines the high level regardless of how many devices participate. Engineers should size the pull-up for total sink current and bus capacitance, noting the single resistor limits the rising edge speed of the shared node.
Recommended
LED Indicator and Display Segments
Driving LED indicators, bar-graph segments, and digitized display segments is a natural fit for the SN74LS07DR. Each output sinks LED return current directly; with a series resistor from a 5 V to 30 V rail, the LED lights when the buffer output is low. The 40 mA per-channel capability comfortably covers high-brightness LEDs that standard TTL outputs cannot drive, and mixed rail voltages let some indicators run at 5 V while others run at 12 V or 24 V on the same chip. Input clamping diodes add robustness on front-panel wiring. The non-inverting behavior keeps firmware logic intuitive, and six channels per SOIC-14 package minimize board area in status-panel applications.
Recommended
TTL Buffering for Test Fixtures
Automatic test equipment and bed-of-nails fixtures use the SN74LS07DR as a robust buffer between sensitive measurement electronics and the device under test. The LS input thresholds reject small noise on fixture cabling, while the output can drive TTL inputs, indicator LEDs, or gate relay muxes without loading the driving circuitry. Its 0 C to 70 C commercial rating and decades-long availability make it a stable BOM item for long-lived test systems. Because outputs are open-collector, fixture outputs can be safely wire-ANDed or tri-stated to a high-Z-like state simply by turning the drive transistor off, letting the fixture share lines between different test resources without contention damage.
Recommended
Microcontroller GPIO Fan-Out and Isolation
Legacy and industrial 5 V microcontrollers often lack the output current to drive peripherals directly, and the SN74LS07DR provides six buffered channels that each sink 40 mA. Placing the buffer between the GPIO and loads such as optocoupler LEDs, small relays, or cable drivers protects the microcontroller from pin stress and inrush, while the open-collector stage isolates the MCU from external supply transients up to the 30 V output rating. Designers place 10 kOhm pull-ups for logic-only nodes and lower-value resistors for load driving, and keep total ground return paths short. Input clamping diodes guard against negative undershoot on cable entries common in noisy factory environments.
Recommended
Recommended Products Summary
Engineering reference data for SN74LS07DR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74LS06DR | SN74HC07DR | SN74LVC07ADR |
|---|---|---|---|---|
| Package | SOIC (D), 14 pins | SOIC (D), 14 pins - same | SOIC (D), 14 pins - same | SOIC (D), 14 pins - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Logic Function | Non-inverting hex buffer/driver | Inverting hex buffer/driver | Non-inverting hex buffer/driver | Non-inverting hex buffer/driver |
| Output Type | Open-collector | Open-collector | Open-drain | Open-drain |
| Rated Output Voltage | 30 V | 30 V | ~5.5 V | ~5.5 V |
| Supply Voltage | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 2 V to 6 V | 1.65 V to 3.6 V |
| Operating Temperature | 0 C to 70 C | 0 C to 70 C | -40 C to 85 C | -40 C to 125 C |
Key Differentiators
- 30 V open-collector output rating (vs SN74HC07DR)
- 40 mA per-channel sink current (vs SN74HC07DR)
- True high-voltage drop-in family pairing (vs SN74LS06DR)
Design Notes
Every SN74LS07DR output must have an external pull-up resistor or load to a defined voltage; an unloaded open-collector output floats and reads unpredictably. Size each pull-up so that sink current at logic low never exceeds the 40 mA maximum - e.g., a 330 ohm pull-up to 12 V sinks about 36 mA, which is at the limit. For relays and solenoids, always fit a flyback diode across the coil, because the open-collector transistor has no avalanche protection specified for repetitive inductive kick.
Estimated: total dissipation equals ICC plus sum of output sink losses. For example, six outputs each sinking 20 mA at VOL around 0.4 V contribute roughly 6 x 0.02 A x 0.4 V = 48 mW, well within the SOIC package's capability. Most heat instead appears in the external pull-up resistors: a 12 V rail through 470 ohm dissipates about 0.3 W when the output is low, so choose resistor wattage accordingly. Verify VOL from the datasheet electrical characteristics for your exact sink current.
Decouple VCC (pin 14) with a 0.1 uF ceramic capacitor placed within a few millimeters of pin 7/14, standard practice for all LS-TTL devices due to fast output transition currents. Keep output traces carrying load current away from input traces to prevent ground-bounce coupling; LS inputs switch around 1.3 V-1.5 V thresholds and can false-trigger on coupled edges. When wire-ANDing channels across boards, place the shared pull-up close to the receiving logic input to minimize the exposed high-impedance node.
Compliance Information
Compliance details were not present in the verified web data; consult the TI product page quality section for current RoHS/REACH certificates for the D (SOIC) package.
