COSINE PART
COS2991S is a Low-Dropout Linear Regulator from COSINE (科山芯创) in a TO-263-5 package.
The manufacturer's 2025 cross-reference table does not publish a direct imported equivalent for this part number. If you are looking for a replacement, send us the part number and we will confirm the matching COSINE option and the differences to check.
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COS2991S — Low-Dropout Linear Regulator
COS2991S is supplied by Shenzhen Jingteng Electronics (JTDZ Tech) as a domestically sourced option for this device class. Imported parts in this class are frequently subject to allocation, long lead times and steep price swings. A Chinese-manufactured equivalent removes that exposure: the parts are production-validated in industrial, consumer and automotive designs and ship from stock on a short lead time.
Device information
| Part number | COS2991S |
| Manufacturer | COSINE (科山芯创) |
| Device class | LDO — Low-Dropout Linear Regulator |
| Package | TO-263-5 |
| Pin Count | 5 |
| Verified and new, traceable date code | |
| Stock | In stock, ships within 24 hours |
| Description | Low-Dropout Linear Regulator, TO-263-5 package. |
What to verify before substituting COS2991S
These are the parameters that decide whether a cross-reference works in practice. Run through the list against the datasheet before releasing a change:
- Dropout voltage at your maximum load current, at the temperature you care about
- Maximum output current and the thermal path — TO-263 and SOT-23 dissipate very differently
- Quiescent and ground current, which decides standby life in battery designs
- Output capacitor requirement and stability: many older LDOs need ESR in a specific window and go unstable with modern ceramic capacitors
- Transient response and the resulting voltage droop on load steps
- Fixed vs adjustable output and the reference voltage if adjustable
- Protection features: current limit, thermal shutdown, reverse-battery protection
- Package and pinout
Typical applications
- Post-regulation after a switching supply
- Analogue and RF rail clean-up
- MCU and sensor power rails
- Battery-powered and portable systems
- Industrial control and instrumentation rails
- Automotive body electronics
Other COSINE Low-Dropout Linear Regulator alternatives
The manufacturer's 2025 table does not publish a direct imported equivalent for COS2991S. These are the cross-references published for other parts in the same device class — send us your part number and we will confirm which one matches.
| COSINE part | Cross-references to |
|---|---|
| COS29302 | MIC29302WU, LM29302 |
| COS29152WU | MIC29152WU |
| COS29302WU | MIC29302WU, LM29302 |
| COS29502WU | MIC29502WU |
| COS29752WU | MIC29752WU |
Related COSINE parts and alternatives
Other {BRAND} parts in the same device family or the same device class — useful when you are cross-referencing a whole BOM rather than a single line item.
| COSINE part | Package | Cross-references to | Relation |
|---|---|---|---|
| COS29302 | TO-263-5 | MIC29302WU, LM29302 | Low-Dropout Linear Regulator |
| COS29152WU | TO-263-5 | MIC29152WU | Low-Dropout Linear Regulator |
| COS29302WU | TO-263-5 | MIC29302WU, LM29302 | Low-Dropout Linear Regulator |
| COS29502WU | TO-263-5 | MIC29502WU | Low-Dropout Linear Regulator |
| COS29752WU | TO-263-5 | MIC29752WU | Low-Dropout Linear Regulator |
Frequently asked questions
What is COS2991S?
COS2991S is a Low-Dropout Linear Regulator from COSINE (科山芯创) in a TO-263-5 package.
Do you have a cross-reference for COS2991S?
The manufacturer's 2025 selection table does not publish a direct imported equivalent for this part number. Send us the part number from your BOM and we will confirm the matching COSINE option and the differences to check.
What is the MOQ and lead time for COS2991S?
MOQ 1 pc. COS2991S ships within 24 hours from stock and quotes are returned within 2 business hours.
Request a quote for COS2991S
Send us the part number and target quantity — we reply within 2 business hours with price, stock and a cross-reference confirmation.
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