MC7812CD2TR4G - 1A 12V Fixed Linear Regulator | onsemi
MPN： MC7812CD2TR4G ✓ 啟用中MC7812CD2TR4G 概覽
A fixed linear regulator is a type of voltage regulator that passes current from input to output while maintaining a predetermined voltage with very low switching noise. Unlike a DC-DC converter, it does not intentionally switch energy between storage components, so it is useful when ripple and simplicity matter more than conversion efficiency. The MC7800 family belongs to the linear-regulator and power-management IC hierarchy, providing local regulation close to the load.
The MC7812CD2TR4G provides a fixed 12 V output and 1 A current capability. Its three-terminal D2PAK package supports surface-mount assembly and includes a tab connected to the output-related thermal path. Internal protection functions help limit fault current and prevent excessive heating, although the final thermal design must still account for the input-to-output voltage difference and load current.
Because linear regulation dissipates power as heat, the most important design tradeoff is efficiency versus noise and circuit simplicity. At a 15 V input and 1 A load, the regulator must pass approximately 3 V across the device, producing about 3 W of dissipation before accounting for other losses. This makes the package tab and PCB copper area important for maintaining safe operating temperature.
Typical applications include 12 V local rails in industrial control equipment, consumer electronics, instrumentation, communications equipment, and power-supply modules. The fixed 12 V output also makes the device suitable for legacy boards requiring a direct replacement for a conventional three-terminal regulator. When selecting a substitute, verify voltage, current, pin arrangement, thermal package, and operating-temperature requirements rather than relying only on the nominal output voltage.
This page combines verified distributor information, manufacturer-linked documentation references, application guidance, and drop-in replacement considerations. The listed alternatives are limited to same-footprint candidates identified from the supplied comparison data; engineers should still verify electrical tolerances, thermal limits, and production qualifications before substitution.
直接替換替代品，適用於 MC7812CD2TR4G — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
MC7812CD2T
✅ 直接替換📋 參考替代品（不在目錄中）
MC7812CD2TR4
✅ 直接替換📋 參考替代品（不在目錄中）
MC7812CTG
✅ 直接替換📋 參考替代品（不在目錄中）
MC7812CDT
✅ 直接替換📋 參考替代品（不在目錄中）
MC7812CD2TG
✅ 直接替換📋 參考替代品（不在目錄中）
MC7812BDT
✅ 直接替換📋 參考替代品（不在目錄中）
MC7812CD2TR4G 最大額定值與電氣特性
| Product Type | Fixed positive linear voltage regulator |
| 輸出電壓 | 12 V |
| Output Current | 1 A |
| 輸入電壓範圍 | 5 V to 24 V |
| 輸出配置 | Single fixed output |
| Protection Functions | Internal current limiting, thermal shutdown, safe-area protection |
| 封裝 | D2PAK-3 / TO-263-3 |
| 安裝類型 | Surface mount |
| Regulator Topology | Linear regulator |
| Polarity | Positive |
| 輸出類型 | Fixed |
| 腳位數 | 3 |
| Lead-Free Status | PbAHP according to supplied comparison data |
| Moisture Sensitivity Level | 1 according to supplied comparison data |
| Reflow Temperature | 260 C according to supplied comparison data |
| Supplier Qualification Context | Active status reported by supplied comparison data |
MC7812CD2TR4G 腳位配置
| 腳位 1 | [DATA_NEEDED: official pin name] — [DATA_NEEDED: official pin description from manufacturer datasheet] |
| 腳位 2 | [DATA_NEEDED: official pin name] — [DATA_NEEDED: official pin description from manufacturer datasheet] |
| 腳位 3 | [DATA_NEEDED: official pin name] — [DATA_NEEDED: official pin description from manufacturer datasheet] |
典型應用
MC7812CD2TR4G 適用於 6 應用s: Industrial Control Power Rails, Consumer Electronics 12 V Inputs, Instrumentation and Measurement Equipment, Communications Equipment, Audio and Analog Equipment, Power-Supply Modules.
Industrial Control Power Rails
The MC7812CD2TR4G is suitable for supplying a fixed 12 V rail near controllers, relays, sensors, and analog circuits when a simple linear path is preferred. Its 1 A rating and three-terminal D2PAK-3 package simplify integration, while internal current limiting and thermal shutdown provide basic fault protection. Designers should size the tab-connected copper area for the expected VIN−12 V drop and load current.
推薦
Consumer Electronics 12 V Inputs
For adapters and equipment that enter through a higher DC bus, the MC7812CD2TR4G can create a local 12 V rail without introducing a switching-converter design. Its fixed positive output and 1 A capability match common legacy boards. The primary engineering concern is heat: the regulator drops the difference between input and 12 V, so package tab area and ambient temperature must be checked at maximum load.
推薦
Instrumentation and Measurement Equipment
The MC7812CD2TR4G can provide a local, regulated 12 V supply for instrumentation modules where low switching ripple and simple point-of-load regulation are useful. A linear regulator avoids the intentional switching frequency of a buck converter, which can simplify sensitive analog or measurement layouts. Input and output capacitors should be selected from the manufacturer reference circuit and placed close to the device pins.
推薦
Communications Equipment
The fixed 12 V output can support communications modules and interface cards that require a predictable rail from a higher-voltage distribution input. The MC7812CD2TR4G is appropriate when the current demand remains within 1 A and the acceptable dissipation can be managed. In multi-board systems, local regulation reduces distribution losses and helps isolate downstream circuitry from upstream ripple.
推薦
Audio and Analog Equipment
A fixed linear regulator can be useful in audio or analog equipment when low converter switching noise is more important than maximum efficiency. The MC7812CD2TR4G provides a stable 12 V rail with a straightforward three-terminal topology, but the designer must account for heat generated by the voltage difference. Star-point grounding and careful decoupling help keep supply disturbances away from sensitive analog sections.
推薦
Power-Supply Modules
The MC7812CD2TR4G is appropriate for a post-regulator or local supply stage where a fixed 12 V output is needed after a higher-voltage converter. Its internal current limiting, thermal shutdown, and safe-area protection support robust module operation, while the surface-mount D2PAK-3 package supports automated assembly. Thermal verification remains essential at maximum input voltage and continuous load.
推薦
推薦產品摘要
工程參考資料，適用於 MC7812CD2TR4G — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MC7812CD2T | MC7812CD2TR4 | MC7812CTG | MC7812CDT |
|---|---|---|---|---|---|
| Output Voltage | 12 V fixed | 12 V fixed | 12 V fixed | 12 V fixed | 12 V fixed |
| Regulator Type | Positive fixed linear regulator | Positive fixed linear regulator | Positive fixed linear regulator | Positive fixed linear regulator | Positive fixed linear regulator |
| Package | D2PAK-3 / TO-263-3 | D2PAK-3 | D2PAK-3 | D2PAK-3 | D2PAK-3 |
| Brand | onsemi | onsemi | onsemi | onsemi | onsemi |
| Application Suitability | Fixed 12 V local regulation | Fixed 12 V local regulation | Fixed 12 V local regulation | Fixed 12 V local regulation | Fixed 12 V local regulation |
主要差異化特點
- Directly identified fixed 12 V, 1 A regulator role (對比MC7812CD2T)
- D2PAK-3 surface-mount integration (對比MC7812CTG)
- Documented protection functions (對比MC7812CDT)
設計說明
Estimated: use P = (VIN − 12 V) × IOUT to calculate worst-case dissipation. At 15 V input and 1 A load, the estimated dissipation is 3 W before auxiliary losses. Connect the D2PAK tab to an appropriately sized copper pour and verify the resulting junction temperature against the manufacturer limit.
Place input and output capacitors close to the regulator pins with short, low-inductance traces. Follow the manufacturer reference circuit for capacitor type, voltage rating, ESR requirements, and placement. Keep the high-current return path compact so the regulator and load share a low-impedance ground reference.
Do not assume that matching the 12 V output and D2PAK outline guarantees drop-in compatibility. Confirm pin numbering, tab connection, dropout voltage, input range, output-current rating, thermal resistance, and ordering suffix in the current manufacturer datasheet before releasing a replacement to production.
合規資訊
The supplied comparison data reports PbAHP lead-free status, but explicit RoHS, REACH, AEC-Q100, halogen-free, and conflict-minerals declarations were not provided. Do not infer formal compliance from PbAHP alone.
