LM7805MPX/NOPB - 1.5A, 30V Fixed 5V Linear Regulator | Texas Instruments
部品番号: LM7805MPX/NOPB ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0.95 | $0.95 |
| 10 | $0.85 | $8.50 |
| 100 | $0.72 | $72.00 |
| 500 | $0.62 | $310.00 |
| 1,000 | $0.55 | $550.00 |
| 2,000 | $0.5 | $1,000.00 |
LM7805MPX/NOPB 概要
A linear regulator is a type of voltage regulator that maintains a constant DC output voltage by dissipating excess input-to-output voltage as heat. Within the power management IC hierarchy, the LM7805 belongs to the linear regulator family, sitting above switching regulators in simplicity (no inductor needed) but below LDO regulators in dropout performance. This trade-off is why 7805-series regulators remain popular as simple, rugged 5 V rails.
Key features include a fixed 5 V output (no external feedback resistors required), 1.5 A continuous output current, internal thermal shutdown and output short-circuit protection, and a wide 7 V to 30 V input operating range. The SOT-223 package offers a tab that doubles as a thermal pad, allowing direct soldering to PCB copper for heatsinking.
Architecturally, the LM7805 uses a classic bipolar pass-transistor topology with a bandgap-derived reference. Unlike an LDO, it requires at least 2 V of input-to-output headroom to maintain regulation, which means it dissipates significant power at high VIN. The output impedance is low and line/load regulation are tight, giving clean DC for digital and analog loads.
Typical applications include microcontroller 5 V rails, sensor signal protection, hobby electronics, and any 5 V supply where simplicity, robustness, and low cost outweigh efficiency.
A practical design consideration is thermal dissipation. At VIN = 12 V and 1 A load, the part dissipates 7 W, so the SOT-223 tab MUST be soldered to a sufficient copper area (typically >=1 square inch) to keep Tj within safe limits.
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: LM7805MPX/NOPB — 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。
クイック比較ツール — 並列比較する代替部品を選択:
LM7805MP/NOPB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM340MPX-5.0/NOPB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM7805MPX/NOPB 最大定格＆電気的特性
| Manufacturer | Texas Instruments |
| Part Number | LM7805MPX/NOPB |
| 出力タイプ | Fixed (5.0 V) |
| 最大出力電流 | 1.5 A |
| 入力電圧範囲 | 7 V to 30 V |
| ドロップアウト電圧 | 2 V typical |
| 静止電流 | 5 mA typical |
| 動作温度 | 0 C to +125 C |
| パッケージ | SOT-223-4 (DCY) |
| 実装タイプ | Surface Mount |
| ピン数 | 4 |
| Protection Features | Thermal Shutdown, Short-Circuit, Safe Area |
| RoHS ステータス | Compliant |
| Lead-Free | Yes (NOPB suffix) |
LM7805MPX/NOPB ピン構成
| ピン 1 | IN — Input voltage (7V to 30V) |
| ピン 2 | GND — Ground |
| ピン 3 | OUT — Regulated 5V output |
| ピン 4 | OUT (Tab) — Output (electrically tied to pin 3) and thermal pad for heatsinking |
主な用途
LM7805MPX/NOPB の用途: 7 件s: Microcontroller 5V Rail, Sensor Signal Conditioning Supply, Hobby Electronics and Prototyping, Industrial 24V to 5V Conversion, Battery-Powered 12V to 5V Supply, LED Strip and Indicator Lighting, Automotive Accessory Power.
Microcontroller 5V Rail
Provides a robust 5V supply for Arduino, PIC, STM32, and AVR microcontrollers. The LM7805MPX's fixed 5V output eliminates the need for feedback resistors, and its 1.5A capacity comfortably supports an MCU plus peripherals like sensors, LEDs, and a small display. Built-in thermal shutdown and short-circuit protection guard against wiring faults common in breadboard prototypes. Designers typically place two 0.1uF and one 10uF capacitor on the input and a 0.1uF plus 10uF on the output for stability.
おすすめ
Sensor Signal Conditioning Supply
Powers 5V analog sensors (e.g., HC-SR04 ultrasonic, PIR, MQ gas sensors) from a higher-voltage battery or wall adapter. The LM7805's low noise linear regulation provides a cleaner rail than most switching converters, improving analog sensor accuracy and reducing digital noise coupling into sensitive measurement channels. Its wide 7-30V input tolerates lead-acid battery droop and unregulated 9V/12V wall-wart supplies without damage, and its 1.5A rating supports arrays of multiple sensors simultaneously.
おすすめ
Hobby Electronics and Prototyping
Powers breadboard projects, robotics kits, and educational lab supplies from common 9V or 12V DC adapters. The LM7805MPX's simple three-pin operation (plus thermal pad) requires no feedback design or compensation, making it ideal for students and rapid prototyping. The SOT-223-4 footprint is small enough for tight boards while the LCC tab accepts substantial copper pour for sustained 1A operation. Its robustness against reverse engineering mistakes (shorted outputs, missing caps) makes it forgiving for beginners.
おすすめ
Industrial 24V to 5V Conversion
Steps 24V industrial bus voltage down to 5V for PLC logic, sensor networks, or HMI displays. The LM7805's 30V absolute maximum input rating accepts 24V nominal bus with up to +/-25% tolerance, eliminating the need for pre-regulation. The use of SOT-223 package with tab heatsinking allows direct PCB mounting in industrial control cabinets where heat must be conducted to a chassis. Internal thermal shutdown prevents fire hazards during sustained short-circuit conditions common in field wiring.
おすすめ
Battery-Powered 12V to 5V Supply
Derives 5V from 12V lead-acid or lithium battery packs for portable instrumentation. The LM7805's simple drop-in operation eliminates inductor design complexity for low-current applications (<500 mA). Above 500 mA, thermal dissipation rises sharply and efficiency drops to ~35% (vs >90% for switching), but the trade-off is acceptable for noise-sensitive analog front-ends. Built-in reverse-bias protection (with input diode) prevents back-feed from battery during external power connection.
おすすめ
LED Strip and Indicator Lighting
Powers 5V addressable LED strips (WS2812B, APA102) and indicator panels from 12V or 24V sources. The LM7805's 1.5A continuous rating supports up to ~60-90 WS2812B LEDs at full white (60 mA per LED theoretical max) with adequate heatsinking. The fixed 5V output eliminates calibration steps required for adjustable regulators, and the clean linear output prevents the PWM noise artifacts occasionally produced by LED drivers. Thermal pad on SOT-223 dissipates heat to a small aluminum PCB or copper pour.
おすすめ
Automotive Accessory Power
Powers 5V USB chargers, dash-cams, and OBD-II dongles from 12V automotive buses via non-critical LM340MPX alternative. Note: LM7805MPX/NOPB's 30V input limit is borderline for automotive 40V load-dump transients; for production automotive designs use LM340MPX-5.0/NOPB instead. The /NOPB lead-free code is RoHS-compliant for automotive OEM requirements. The robust SOT-223 footprint tolerates under-hood thermal cycling from -40 C to +85 C when properly heatsunk.
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: LM7805MPX/NOPB — 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 | LM7805MP/NOPB | LM340MPX-5.0/NOPB | LM7805CT/NOPB | L7805CV-DG | L7805CDT-TR |
|---|---|---|---|---|---|---|
| Package | SOT-223-4 (DCY) | SOT-223-4 (DCY) | SOT-223-4 (DCY) | TO-220-3 (Site MPN) | TO-220-3 | TO-252 (DPAK) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics | STMicroelectronics |
| Output Voltage | 5.0 V | 5.0 V | 5.0 V | 5.0 V | 5.0 V | 5.0 V |
| Maximum Input Voltage | 30 V | 30 V | 35 V | 30 V | 35 V | 35 V |
| Output Current | 1.5 A | 1.5 A | 1.5 A | 1.5 A | 1.5 A | 1.5 A |
| Operating Temperature | 0 C to +125 C | 0 C to +125 C | 0 C to +125 C | 0 C to +125 C | 0 C to +125 C | 0 C to +125 C |
| Topology | Linear (LDO subclass) | Linear | Linear | Linear | Linear | Linear |
| Approx. Unit Price @ 1k (USD) | 0.55 | 0.55 | 0.45 | 0.65 | 0.40 | 0.45 |
主な差別化要因
- Highest input voltage rating among 5V 1.5A SOT-223 TI parts （vs LM340MPX-5.0/NOPB)
- Compact SOT-223 footprint with thermal tab （vs LM7805CT/NOPB (TO-220))
- Cross-brand ecosystem with same datasheet family （vs L7805CDT-TR (STMicroelectronics))
設計ノート
Estimated: at VIN=12V, VOUT=5V, IOUT=1A, power dissipation is 7W. With SOT-223 theta_JA around 60 C/W on a 1-square-inch 1-oz copper pour, junction temperature rises ~100 C above ambient, requiring more copper or forced airflow. For sustained 1.5A output, expand copper area to >=2 square inches or add forced airflow. Without thermal pad heatsinking, the part will thermal-shutdown at ~0.5A at VIN=12V.
Place input capacitor (0.1uF ceramic plus optional 10uF electrolytic) within 1 cm of the IN pin, and output capacitor (0.1uF ceramic plus 10uF electrolytic or tantalum) within 1 cm of OUT pin. Solder the SOT-223 tab to PCB copper using multiple thermal vias to inner ground/power planes. Add reverse-polarity protection diode on input for hobby applications.
Do not exceed 30V input (transient peaks beyond 35V can damage the internal pass transistor). Do not operate below 7V input - dropout at VIN=7V, VOUT=5V is borderline; output will droop below 5V at high load. The part does NOT have reverse-polarity protection - add external Schottky diode or P-MOSFET on input for safe hobby use.
Route input current path (high-current) directly from source to IN pin, avoiding shared ground impedance with analog signal ground. Keep analog sensor signal traces physically separated from LM7805 input traces to avoid coupling from switching loads on the source. Place output cap close to OUT pin with low-impedance ground return.
コンプライアンス情報
RoHS compliant per /NOPB suffix. Lead-free (Pb-free) reflow-compatible per NOPB code. AEC-Q100 not qualified - choose automotive-grade parts like LM340MPX-5.0/NOPB for automotive.
