L7805ABV-DG - 5V 1.5A Positive LDO Regulator | STMicroelectronics
料号： L7805ABV-DG ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.42 | $0.42 |
| 10 | $0.35 | $3.50 |
| 100 | $0.3 | $30.00 |
| 500 | $0.26 | $130.00 |
| 1,000 | $0.2314 | $231.40 |
L7805ABV-DG 概述
A linear voltage regulator is a power-management IC that maintains a constant DC output voltage by dissipating the difference between input and output voltage as heat. In the regulator hierarchy - voltage regulator, then linear regulator, then low-dropout (LDO) regulator - the L7800 series is a standard (non-LDO) linear regulator requiring approximately 2V of dropout headroom. Three-terminal regulators like the 7805 remain among the most widely used power ICs in electronics history.
Key features of the L7805ABV-DG include the 5V fixed output with 2% tolerance (the A-version advantage over the standard L7805CV 4% grade), 1.5A maximum output current with adequate heatsinking, output transition SOA protection, short-circuit protection, and thermal overload protection. Thermal shutdown typically activates near 150C junction temperature, protecting the device during fault conditions.
Internally, the device uses a bipolar linear architecture with a bandgap reference and series pass transistor. Quiescent current is in the millivolt-per-milliamp range typical of the L78 family, and ripple rejection is approximately 70 to 80 dB at low frequencies when the input is well-filtered, allowing it to clean up noisy upstream supplies for analog loads.
Typical applications include 5V logic supplies for microcontrollers, powering sensors and relay coils in industrial controls, post-regulation after DC-DC converters, bench and educational power supplies, and automotive accessory circuits (with suitable input protection). Its through-hole TO-220 package also makes it a favorite for prototyping and repair work.
Design consideration: keep the input at least 2V above the output (7V minimum at the regulator input for a 5V output) across all load and ripple conditions, and size the heatsink for worst-case dissipation of (VIN - 5V) x IOUT.
This page synthesizes distributor pricing from 11 sources, verified drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet, as of 2026-10-20.
直接替换替代料： L7805ABV-DG ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： L7805ABV-DG （相同外形与封装尺寸） ——差异在于 Mounting Type, Output Voltage, Package, Maximum Output Current, Output Voltage Tolerance.
快速对比工具——选择替代料号进行并排对比：
L7805CV-DG
✅ 直接替换📋 参考替代料（不在目录中）
L7805ACV-DG
✅ 直接替换📋 参考替代料（不在目录中）
L7805ABV
✅ 直接替换✓ 有现货
$0.1416 / 个
查看数据手册 →LM7805CT/NOPB
✅ 直接替换✓ 有现货
$0.74 / 个
查看数据手册 →MC7805CT
✅ 直接替换📋 参考替代料（不在目录中）
KA7805
✅ 直接替换📋 参考替代料（不在目录中）
L7805ABV-DG 最大额定值与电气特性
| Regulator Type | Standard linear positive regulator |
| Output Polarity | Positive |
| 输出电压 | 5 V fixed |
| Output Voltage Tolerance | 2% (A version) |
| 最大输出电流 | 1.5 A |
| 输出数量 | 1 |
| 封装 | TO-220 (3 pins + tab) |
| 安装类型 | Through Hole |
| Protections | Thermal shutdown, short circuit, output transition SOA |
| 压差电压 | Approximately 2 V (L78 family standard) |
| RoHS 状态 | RoHS compliant |
| 生命周期状态 | Active |
| Packaging | Tube |
L7805ABV-DG 引脚配置
| 引脚 1 | IN — Unregulated input voltage (typically 7V to 35V for 5V output) |
| 引脚 2 | GND — Ground; connected to the metal tab |
| 引脚 3 | OUT — Regulated 5V output |
典型应用
L7805ABV-DG 适用于 6 应用s: 5V Microcontroller Logic Supply, Industrial Control and Relay Drivers, Post-Regulation After DC-DC Converters, Bench Power Supplies and Prototyping, Embedded Systems and Sensor Nodes, Audio and Analog Front-End Rails.
5V Microcontroller Logic Supply
The L7805ABV-DG is a textbook choice for 5V logic rails feeding microcontrollers, shift registers, and TTL/CMOS logic. Its fixed 5V output with 2% A-version tolerance keeps the rail inside the 5V +/-5% logic specification with margin to spare, while the 1.5A capability covers MCU plus peripheral loads. Placed after a 9V or 12V wall adapter or transformer-rectifier stage with a 0.33uF input and 0.1uF output capacitor per the STMicroelectronics datasheet, it provides a clean, regulation-proof supply. Because it is a linear regulator it adds no switching ripple, which matters for analog-on-chip peripherals like ADCs.
推荐
Industrial Control and Relay Drivers
In PLC I/O modules, motor contactor logic boards, and sensor junction boxes, the L7805ABV-DG regulates a 24V-derived rail down to a robust 5V for logic and indicator circuits. Its internal short-circuit protection, current limiting, and SOA protection tolerate wiring faults and inrush from decoupling banks without external fusing at moderate loads, a feature STMicroelectronics describes as making the device essentially indestructible. The TO-220 tab bolts directly to the enclosure or a small heatsink, dissipating (VIN-5V) x IOUT. Designers should account for the large 24V differential at higher currents, sizing the heatsink accordingly or pre-dropping with a series resistor.
推荐
Post-Regulation After DC-DC Converters
A common hybrid power architecture runs a buck converter from 12V or 24V down to about 6V, then feeds the L7805ABV-DG for final regulation. The switching stage provides high efficiency while the linear stage strips switching ripple and load-transient artifacts, delivering the low-noise 5V rail that sensitive analog front ends require. With only a 1V to 1.5V dropout across the regulator, dissipation stays manageable even near full load. The L7805ABV-DG's roughly 70 dB-class low-frequency ripple rejection suppresses converter residue, and the A-version 2% tolerance preserves rail accuracy after the upstream switching tolerance stack.
推荐
Bench Power Supplies and Prototyping
The through-hole TO-220 package and forgiving protection set make the L7805ABV-DG the default regulator for breadboards, lab supplies, and educational kits. It survives accidental output shorts, reversed probe touches are handled by limiting circuitry, and thermal shutdown prevents permanent damage during student overload experiments. A classic 9V-to-5V bench rail uses a transformer, bridge rectifier, 2200uF filter capacitor, and the L7805ABV-DG with its datasheet-recommended 0.33uF/0.1uF capacitors. Input must remain above approximately 7V including ripple to hold regulation across the full load range.
推荐
Embedded Systems and Sensor Nodes
For mains- or vehicle-powered embedded controllers that also host 5V sensors, an L7805ABV-DG fed from a 9V-12V pre-regulated or rectified supply provides a dependable logic rail. Where loads include ultrasonic, gas, or humidity sensors drawing tens of milliamps, the linear regulator's noise-free output improves sensor analog accuracy compared to a standalone buck. Estimated dissipation at VIN=12V and 200mA total load is 1.4W, within the capability of a modest TO-220 heatsink. The A-version 2% tolerance keeps ADC reference-derived sensor scaling accurate across production units without per-board calibration.
推荐
Audio and Analog Front-End Rails
Preamp, mixer, and small-amplifier designs benefit from the L7805ABV-DG's linear topology, which introduces no switching spurs into the audio band and pairs well with 70 dB-class ripple rejection to reject supply hum. Powering digital audio sections (DACs, microcontroller control logic) from this regulator keeps digital noise off the analog chain when the analog rails use separate regulation. Designers should decouple locally at each IC with 100nF ceramics and reserve the L7805ABV-DG for current loads under about 1A, since audio amplifiers drawing amps are better served by dedicated power stages with larger heatsinking.
推荐
推荐产品汇总
工程参考数据： L7805ABV-DG ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | L7805CV-DG | L7805ACV-DG | LM7805CT | MC7805CT |
|---|---|---|---|---|---|
| Package | TO-220 | TO-220 - same | TO-220 - same | TO-220 - same | TO-220 - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments | onsemi |
| Output Voltage | 5 V fixed | 5 V fixed | 5 V fixed | 5 V fixed | 5 V fixed |
| Output Voltage Tolerance | 2% (A version) | Standard grade (wider) | 2% (A version) | Standard grade | Standard grade |
| Maximum Output Current | 1.5 A | 1.5 A | 1.5 A | 1.5 A | 1.5 A |
| Protections | Current limit, thermal shutdown, SOA | Current limit, thermal shutdown, SOA | Current limit, thermal shutdown, SOA | Current limit, thermal shutdown, SOA | Current limit, thermal shutdown, SOA |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole |
关键差异点
- Tighter 2% output voltage tolerance (A-version grade) （对比 L7805CV-DG)
- Integrated triple protection set （对比 LM7805CT)
- Trade-off: higher dropout than modern LDOs （对比 MIC29151T-3.3G)
设计说明
Estimated: power dissipation is (VIN - 5V) x IOUT. At VIN = 12V and 1A load the L7805ABV-DG dissipates 7W, far beyond what a bare TO-220 can handle at typical ambient temperatures, so a heatsink with low thermal resistance and thermal paste is mandatory. At 200mA the same design dissipates only 1.4W, usually fine with a small clip-on heatsink. Always compute worst-case load and minimum ambient airflow, and confirm the junction stays well below thermal shutdown to avoid regulation dropouts.
Keep the input lead path short and place a 0.33uF ceramic at the input pin and a 0.1uF ceramic at the output pin, per the ST L78 datasheet recommendation, especially when the regulator sits more than a few centimeters from the main filter capacitor. Add 10uF-100uF bulk output capacitance for pulsed loads. Because the tab is grounded, verify the mounting hole is isolated from other net copper, or use a mica washer and shoulder washer when bolting to a shared heatsink.
Two classic L78 failure modes to avoid: (1) insufficient headroom - if the input, including ripple valleys, falls below about 7V, the output drops out of regulation; verify at full load and hot conditions. (2) Reverse output-to-input voltage in dual-supply or large-output-capacitance systems when the input is shorted can damage the device - add a protection diode from output to input as shown in the ST datasheet application section. Also avoid omitting the output capacitor entirely with long inductive wiring, which can degrade transient behavior.
合规信息
Distributor listing explicitly marks this part ROHS COMPLIANT. REACH, halogen-free, and conflict-minerals declarations not found in provided data - consult official ST product compliance documentation.
