SN74LS07N - 6-Channel Open-Collector Buffer | Texas Instruments
MPN: SN74LS07N ✓ NakahandaSN74LS07N Ulas
An open-collector buffer or driver is a digital interface IC whose output transistor can sink current but cannot actively source current. It belongs to the logic IC hierarchy: digital buffer/line driver, interface device, semiconductor, and through-hole DIP package. This distinction is important because the output node floats high when the transistor is off, allowing the external pull-up voltage to determine the high level. The SN74LS07 therefore differs from ordinary totem-pole TTL outputs, which source current actively.
The main engineering benefits are six independent channels, high-voltage open-collector outputs, high sink-current capability, and operation from a single 5 V supply. The rated 30 V output voltage supports interfaces involving higher-voltage control signals, while the 40 mA maximum sink current is relevant for indicator lamps and relay coils. The device can also convert TTL-level inputs into suitable sink-current drive signals for MOS-level, lamp, or relay-control circuits. Because outputs are open-collector, multiple channels can be tied together with one pull-up when the intended use is wired-AND behavior.
SN74LS07N uses Low-Power Schottky TTL-compatible logic characteristics. Its inputs are designed to be driven from TTL signals, and its output behavior is intentionally asymmetric: the output transistor pulls the node down but leaves it high-impedance when inactive. Propagation delay, rise time, fall time, input thresholds, output leakage, and temperature limits must be taken from the manufacturer datasheet when timing or system-level compatibility is critical. The supplied search results confirm the 4.75 V to 5.25 V supply range, 30 V rated output voltage, and 40 mA maximum sink current.
Typical applications include relay and solenoid drivers, indicator-lamp interfaces, open-collector alarm and fault signaling, bidirectional-looking bus interfaces where wired-AND operation is desired, and level translation from TTL logic to higher-voltage open-collector nets. In a relay circuit, the SN74LS07N output transistor sinks coil current while the flyback diode returns inductive current to the supply or clamp network. In a lamp circuit, the pull-up resistor supplies current when the channel turns on, allowing the same logic family to control a load that is not driven directly by a standard TTL output.
When laying out a design, place the pull-up resistor close to the shared output node and choose its value from the required sink current, pull-up voltage, input leakage, and load capacitance. Do not assume a push-pull signal can be attached directly without checking contention. Verify the external load's voltage and current against the 30 V and 40 mA ratings, and account for transistor power dissipation when driving a continuously energized load. This page combines verified manufacturer and distributor information with practical application and replacement guidance.
Mga alternatibo na pwedeng ilagay na SN74LS07N — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
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SN74LS07N Mga Pinakamataas na Rating at Electrical Characteristics
| Product Type | Hex buffer/driver with open-collector high-voltage outputs |
| Number of Channels | 6 channels |
| Logic Family | 74LS bipolar TTL |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Rated Output Voltage | 30 V |
| Maximum Sink Current | 40 mA per channel |
| Output Kumpigurasyon | Open collector |
| Input Compatibility | TTL inputs |
| Packhaging | 14-PDIP |
| Uri ng Pagpapasok | Through-hole |
Gabay sa Pin Configuration ng SN74LS07N 14-pdip
Pin configuration para sa SN74LS07N (14-pdip package). Kasama sa digital IC na ito ang GPIO, mga communication interface (UART, SPI, I2C), at mga power pin. Sumangguni sa datasheet ng manufacturer para sa mga alternatibong function ng pin at mga opsyon sa configuration. Mahalaga para sa disenyo ng embedded system at PCB layout.
Wala ng detalyadong pinout data na magagamit para sa SN74LS07N.
Sumangguni sa datasheet para sa buong pin configuration.
Tipikal na mga Gamit
SN74LS07N ay nararapat para sa 6 aplikasyons: Relay and Solenoid Drive, Indicator Lamp Control, TTL to Higher-Voltage Interface, Wired-AND Fault Signaling, Legacy TTL Peripheral Interfacing, Open-Collector Level Translation.
Relay and Solenoid Drive
SN74LS07N is suitable for driving low-voltage relay or solenoid coils when their current stays below the device's 40 mA maximum sink-current rating and their voltage remains within the 30 V output rating. Connect the coil between the open-collector output node and the appropriate supply, then add a flyback diode across the coil to suppress inductive voltage spikes. The output transistor pulls the node low when the TTL input is asserted, while the pull-up resistor establishes the inactive state. This arrangement separates 5 V logic control from the load current and is useful in automation, alarm, and interlock systems.
Inirekomenda
Indicator Lamp Control
Use SN74LS07N to sink current through an indicator lamp while the logic supply provides control for the system. The lamp and pull-up network operate as a switched high-side load from the output's perspective, while the IC provides the low-side sink path. The external pull-up resistor should be selected so that the worst-case current remains below the 40 mA rating and the lamp brightness meets the design requirement. Compared with a push-pull TTL output, the open-collector arrangement leaves the node high impedance when off, simplifying shared fault and status signaling.
Inirekomenda
TTL to Higher-Voltage Interface
SN74LS07N provides a controlled interface from TTL-compatible logic to an open-collector net whose pull-up voltage can be higher than the 5 V logic supply, subject to the 30 V rated output voltage. The six channels allow several unrelated control or status signals to be converted using the same package family. A pull-up resistor defines the high level, while the output transistor provides the active-low sink path. This is useful when a system must retain TTL logic compatibility while driving a higher-level discrete or interface circuit.
Inirekomenda
Wired-AND Fault Signaling
The open-collector outputs of SN74LS07N are suited to wired-AND fault or alarm buses because each channel can pull a shared node low and otherwise remains high impedance. A single pull-up resistor establishes the bus-high state, and any active driver can assert the low state. This property is useful in industrial equipment, test systems, and legacy digital control panels where multiple fault sources must share one signal line. Designers must guarantee that all drivers use compatible voltage levels and that normal logic states cannot create contention.
Inirekomenda
Legacy TTL Peripheral Interfacing
SN74LS07N can buffer TTL inputs and present an open-collector output to legacy peripherals, including systems that expect a pulled-low control input rather than a push-pull signal. The input side preserves compatibility with TTL logic while the output side provides a defined sink-current path and a flexible pull-up voltage. This makes the device useful when modern controller boards must connect to older industrial, printer, instrument, or control equipment. Confirm signal polarity and timing at the receiving device before deployment.
Inirekomenda
Open-Collector Level Translation
Use SN74LS07N to translate a TTL-driven control signal into an open-collector signal referenced to a pull-up voltage selected for the next circuit stage. The pull-up can be selected independently of the 5 V device supply, allowing the interface to work with suitable higher-voltage control nets within the 30 V output limit. The translation is unidirectional in its actively driven state: the IC reliably controls the low level, while the pull-up determines the high level. Check receiver thresholds, leakage current, noise margin, and timing before using it as a general-purpose level translator.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for SN74LS07N — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Pangunahing mga Pagkakaiba
- Six independent open-collector channels (kumpara saSN7407N)
- 30 V rated output voltage (kumpara saSN7407N)
- 40 mA maximum sink current (kumpara saSN7407N)
- TTL-compatible input buffering (kumpara saSN7407N)
Talaan ng Disenyo
Calculate the load and pull-up current before layout. The output transistor can sink up to 40 mA per channel according to the TI datasheet, so the resistor and external load must remain below that limit under worst-case conditions. For a pull-up voltage VPU and load current IL, the resistor must limit the off-state pull-up current while still meeting the receiver's rise-time requirement. Estimated: with a 5 V pull-up and a 40 mA maximum sink target, the minimum resistor value is 125 ohm; this is a design estimate, not a manufacturer specification, and actual timing and load requirements may require a larger value.
Do not connect a push-pull driver directly to an SN74LS07N output node unless all possible drive states have been reviewed. When the SN74LS07N is off, the node is high impedance, but a push-pull output can still contend with the pull-up or another driver. Use open-collector or open-drain signaling on the shared node, add a suitable pull-up, and confirm that receiver thresholds and polarity match the intended interface.
Place the pull-up resistor close to the output node and keep the driven load connection short enough to control capacitance and ringing. For relay or solenoid loads, route the flyback diode close to the coil and keep high-current switching paths away from sensitive logic traces. The open-collector architecture reduces active-drive contention, but long cables and slow pull-up edges can still increase susceptibility to noise and timing errors.
Check the output transistor's dissipation continuously, especially when a channel drives a lamp or relay coil for long periods. Estimated: power in the sinking transistor is approximately (Vload − VOL) multiplied by IL; use the datasheet's VOL at the actual current and temperature rather than assuming zero volts. The verified data provides a 40 mA sink-current rating but does not provide thermal resistance or a complete power table, so final thermal validation requires the manufacturer datasheet and PCB thermal information.
Impormasyon ng Pagsunod sa Kautusan
The verified web data does not provide compliance declarations for SN74LS07N. Compliance status must be confirmed from the current manufacturer product documentation or distributor records.
