SN74LS07DRE4 - Hex Buffer Open-Collector 30V | TI
部品番号: SN74LS07DRE4 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 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 概要
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.
ドロップイン代替品: SN74LS07DRE4 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: SN74LS07DRE4 （同一形状・フットプリント） — 相違点: Operating Temperature, Package, Packaging.
クイック比較ツール — 並列比較する代替部品を選択:
SN74LS07DR
✅ ドロップイン✓ 在庫あり
$0.19 / 個
データシートを見る →SN74LS07DRG4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SN74LS07DE4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SN74LS07DG4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SN74LS07D
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
SN74LS07DRE4 最大定格＆電気的特性
| Logic Function | Hex non-inverting buffer/driver |
| Number of Elements | 6 |
| Bits per Element | 1 |
| 出力タイプ | 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 |
| パッケージ | 14-SOIC (D) |
| 実装タイプ | Surface Mount |
| 動作温度 | 0C to 70C |
| Packaging | Tape & Reel (DRE4) |
| RoHS ステータス | Compliant |
| Application | Buffer for driving TTL inputs; high-level interface circuits; high-current load drive |
SN74LS07DRE4 ピン構成
| ピン 1 | 1A — Buffer 1 input |
| ピン 2 | 1Y — Buffer 1 open-collector output (30 V) |
| ピン 3 | 2A — Buffer 2 input |
| ピン 4 | 2Y — Buffer 2 open-collector output (30 V) |
| ピン 5 | 3A — Buffer 3 input |
| ピン 6 | 3Y — Buffer 3 open-collector output (30 V) |
| ピン 7 | GND — Ground |
| ピン 8 | 4Y — Buffer 4 open-collector output (30 V) |
| ピン 9 | 4A — Buffer 4 input |
| ピン 10 | 5Y — Buffer 5 open-collector output (30 V) |
| ピン 11 | 5A — Buffer 5 input |
| ピン 12 | 6Y — Buffer 6 open-collector output (30 V) |
| ピン 13 | 6A — Buffer 6 input |
| ピン 14 | VCC — Supply voltage, 4.75 V to 5.25 V |
主な用途
SN74LS07DRE4 の用途: 6 件s: 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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: SN74LS07DRE4 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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 |
主な差別化要因
- 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)
設計ノート
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.
コンプライアンス情報
The E4 suffix in TI ordering codes denotes lead-free, RoHS-compliant assembly. REACH and conflict-minerals status not stated in provided data.
