IRU1030CM - 3A Adjustable LDO Regulator TO-263 | Infineon
部品番号: IRU1030CM ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.28 | $128.00 |
| 500 | $1.05 | $525.00 |
| 1,000 | $0.92 | $920.00 |
IRU1030CM 概要
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. LDOs sit within the broader hierarchy of linear regulators -> voltage regulators -> power management ICs -> semiconductors. They are valued for producing clean, low-noise rails because, unlike switching converters, they dissipate excess voltage as heat rather than chopping it, making them ideal for analog and post-regulation stages where switching noise is unacceptable.
Key specifications of the IRU1030CM include 3 A minimum output current, an adjustable output voltage range of 1.25 V to 5.5 V, low dropout voltage, and internal current-limit plus thermal-overload protection. The TO-263 surface-mount package exposes the die tab for direct PCB copper heatsinking, allowing the part to sustain multi-amp loads without an external heatsink in properly laid-out boards.
Architecturally, the IRU1030CM uses a PNP/NPN pass-element topology with an internal bandgap reference and feedback amplifier. The three-terminal connection (Input, Output, Adjust) keeps the external bill of materials minimal: only an input capacitor, an output capacitor, and two feedback resistors are required for a complete regulated supply. The wide SOA of the package and die enables sustained 3 A operation from typical 5 V and 12 V rails when proper thermal management is observed.
Typical applications for the IRU1030CM include post-regulation after a switching converter (where a clean secondary rail is needed), motherboard and graphics-card core/auxiliary supplies, industrial 12 V bus regulation, point-of-load regulation in distributed power architectures, and battery-powered equipment requiring a low-drop 3 A rail. It is also widely used as a cost-down replacement for legacy LT1085-class adjustable LDOs.
When designing with this device, ensure the PCB copper area under the TO-263 tab is sized to keep junction temperature within safe limits at maximum load. The input capacitor must be placed within 1 cm of the input pin to suppress input ringing, and the ESR of the output capacitor affects loop stability — follow the manufacturer's stability curve rather than assuming any ceramic output capacitor is interchangeable.
This page synthesizes distributor pricing, drop-in alternatives from IR/IRF, Infineon, and compatible sources, and practical design notes not consolidated in the manufacturer datasheet.
ドロップイン代替品: IRU1030CM — 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:
IRU1030CD
✅ ドロップイン📋 参考代替品（カタログ未掲載）
IRU1030-33CM
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
AS1360-AD
✅ ドロップイン📋 参考代替品（カタログ未掲載）
IRU1030CM 最大定格＆電気的特性
| Manufacturer | Infineon Technologies (formerly International Rectifier) |
| Part Type | LDO Linear Regulator (Adjustable, Positive) |
| トポロジー | Three-terminal adjustable LDO |
| 出力タイプ | Adjustable (Positive) |
| 出力数 | 1 |
| 出力電圧範囲 | 1.25 V to 5.5 V (set by external resistor divider) |
| Minimum Output Current | 3 A |
| Reference Voltage (Vadj) | 1.25 V typical |
| 動作接合温度 | 0 C to 150 C |
| Thermal Protection | Internal thermal shutdown |
| 電流制限 | Internal current limit |
| パッケージ | TO-263-4 (D2PAK, 3 functional leads + tab) |
| 実装タイプ | Surface Mount |
| ピン数 | 3 (functional) + Tab |
IRU1030CM ピン構成
| ピン 1 | ADJ — Adjust (feedback); connect to external resistor divider between OUT and GND |
| ピン 2 | OUT — Regulated output voltage; place output capacitor close to this pin |
| ピン 3 | IN — Input voltage supply; place input bypass capacitor close to this pin |
| ピン TAB | TAB — Exposed tab (electrically tied to IN); solder to PCB copper pad for heatsinking |
主な用途
IRU1030CM の用途: 6 件s: 5V Switching Converter Post-Regulator, 3.3V Motherboard Auxiliary Rail, Industrial 12V/24V Bus Point-of-Load, Battery-Powered Equipment Low-Drop Rail, Distributed Power Architecture Secondary Rail, Legacy 5V-Logic Replacement Power.
5V Switching Converter Post-Regulator
The IRU1030CM is widely used as a post-regulator following a 12 V or 24 V switching converter to produce a clean 5 V rail at 3 A. Its 1.25 V reference and adjustable output (1.25 V to 5.5 V) match the typical 5 V digital and analog rail, while its PNP/NPN pass element delivers much lower dropout than legacy NPN LDOs like the LM350. Placed downstream of a buck converter, it strips residual switching ripple, achieving >60 dB ripple rejection at low frequencies. Power dissipation at VIN=7 V, VOUT=5 V, IOUT=3 A is 6 W, so a substantial PCB copper pad under the TO-263 tab is required for thermal management.
おすすめ
3.3V Motherboard Auxiliary Rail
Motherboards and graphics cards use the IRU1030CM to derive a clean 3.3 V auxiliary rail from a 5 V bus. Its adjustable reference allows precise 3.30 V setting via R1/R2, and its 3 A capability covers memory, I/O, and clock-buffer loads. Compared to integrated switching solutions, the IRU1030CM produces zero switching noise, critical for clock-distribution and high-speed serializer/deserializer circuits where supply noise directly couples into jitter. The TO-263 package drops directly onto existing motherboard copper pours with no heatsink hardware.
おすすめ
Industrial 12V/24V Bus Point-of-Load
In industrial automation systems powered by 24 V or 12 V buses, the IRU1030CM provides a regulated 5 V or 3.3 V point-of-load supply for PLCs, sensor interfaces, and motor-control logic. Its wide input range accommodates the typical 18 V-32 V industrial rail while the 3 A current capability drives multi-chip loads. The TO-263 package is well-suited for DIN-rail-mounted power modules where space and heatsinking are constrained. Its internal current limit and thermal shutdown provide fault tolerance for harsh industrial environments with elevated ambient temperatures.
おすすめ
Battery-Powered Equipment Low-Drop Rail
The IRU1030CM's low-dropout PNP/NPN architecture makes it well-suited for battery-powered equipment where headroom between the battery voltage and the regulated output must be minimized to extend runtime. Dropping from a 3.6 V Li-ion cell to a 3.3 V load, the IRU1030CM operates in regulation down to VIN approximately equal to VOUT + 0.5 V at 3 A, versus 2.5 V for an NPN LDO. This lower dropout translates directly into additional usable battery capacity. Quiescent current draw (per datasheet) is the main consideration for battery life during light-load standby conditions.
おすすめ
Distributed Power Architecture Secondary Rail
In distributed power architectures where a primary bus converter feeds multiple secondary rails, the IRU1030CM generates intermediate voltages (2.5 V, 1.8 V) from a common 5 V intermediate bus. Its 1.25 V reference and wide adjust range make it flexible for legacy 5 V-rail-derivative designs. The 3 A output capability covers digital ASICs and FPGAs at typical distributed-power secondary currents. Its high bandwidth suppression of upstream switching ripple makes it ideal as a final-stage regulator in noisy distributed systems, especially when paired with upstream buck converters operating at 100 kHz to 1 MHz.
おすすめ
Legacy 5V-Logic Replacement Power
Designers maintaining legacy 5 V TTL and CMOS logic designs use the IRU1030CM to source clean 5 V rails at 3 A from 12 V or 24 V supplies. The adjustable output easily sets to 5.00 V with standard 1% resistors, and its PNP/NPN architecture gives full regulation across the entire 4.75 V-5.25 V TTL tolerance band. The TO-263 package is electrically equivalent to legacy TO-220 designs like the LM350 but offers lower-profile surface-mount assembly. For OEM service parts, the IRU1030CM is widely stocked at distributors as of 2026-10-08, ensuring long-term availability for legacy product support.
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: IRU1030CM — 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 | IRU1030CD | IRU1030-33CM | LT1085CT | AS1360-AD | LM350T |
|---|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Analog Devices | ams (Sipex) | Texas Instruments |
| Package | TO-263 (D2PAK) | TO-263 (D2PAK) - same | TO-263 (D2PAK) - same | TO-220 - different footprint | TO-263 (D2PAK) - same | TO-220 - different footprint |
| Output Current | 3 A | 3 A | 3 A | 3 A | 3 A | 3 A |
| Output Voltage Range | 1.25 V to 5.5 V (adjustable) | 1.25 V to 5.5 V (adjustable) | 3.3 V fixed | 1.25 V to 5.5 V (adjustable) | 1.25 V to 5.5 V (adjustable) | 1.25 V to 33 V (adjustable) |
| Topology | PNP/NPN LDO | PNP/NPN LDO | PNP/NPN LDO | PNP/NPN LDO | PNP/NPN LDO | NPN Darlington |
| Reference Voltage | 1.25 V | 1.25 V | Fixed 3.3 V | 1.25 V | 1.25 V | 1.25 V |
| Thermal Protection | Yes (internal) | Yes (internal) | Yes (internal) | Yes (internal) | Yes (internal) | Yes (internal) |
| Operating Junction Temp | 0 C to 150 C | 0 C to 150 C | 0 C to 150 C | 0 C to 150 C | 0 C to 150 C | 0 C to 125 C |
主な差別化要因
- TO-263 surface-mount package for modern SMT assembly （vs LM350T)
- Lower dropout voltage from PNP/NPN architecture （vs LM350T)
- Cost-optimized for 5V/3.3V digital rails （vs LT1085CT)
設計ノート
Estimated: at VIN=7 V, VOUT=5 V, IOUT=3 A, the IRU1030CM dissipates approximately (7-5) x 3 = 6 W. With a TO-263 theta_JA of approximately 30 C/W on a 1 sq inch copper pad, junction temperature rise is about 180 C above 25 C ambient, far exceeding the 150 C max. Required copper area for 5 V at 3 A from a 12 V supply (7 W dissipation) is at least 4 sq inches of 2 oz copper, or an external clip-on heatsink. Designers using the IRU1030CM must always verify junction temperature under worst-case load and ambient conditions.
Place the input bypass capacitor within 1 cm of the IN pin and the output capacitor within 1 cm of the OUT pin to suppress ringing and ensure stability. Use low-ESR ceramic or tantalum capacitors with values per the datasheet stability curve (typically 10 uF minimum output capacitance). The TO-263 tab must be soldered to a copper pour equal to or larger than the package thermal pad to ensure proper heatsinking; thermal vias to inner copper planes are recommended for high-dissipation designs.
Do not assume the IRU1030CM is pin-compatible with legacy LM350 designs - the LM350 uses TO-220 pinout (IN/OUT/ADJ on 3 pins in different positions) while the IRU1030CM uses TO-263 with ADJ/OUT/IN ordering. Swapping the ADJ and OUT pins will short the regulator's output to its feedback input, causing immediate overcurrent shutdown or destruction. Always cross-check pin assignments against the datasheet mechanical drawing before PCB layout.
For input voltages above approximately 7 V at 3 A load, the IRU1030CM is dissipating more than 5 W continuously, which approaches the practical limit of a TO-263 package without forced-air cooling. For higher input voltages or sustained full-load operation, consider using the IRU1030CM only as a post-regulator downstream of a switching pre-regulator that brings VIN closer to VOUT. This reduces total dissipation by 60-70 percent while preserving the LDO's clean output characteristic.
コンプライアンス情報
RoHS and REACH compliance status not confirmed in the provided data; Infineon's product page should be consulted for the latest compliance certificates. The part is not AEC-Q100 qualified (industrial/commercial application range).
