Orderable parts
| Type number | Orderable part number | Ordering code (12NC) | Package | Buy from distributors |
|---|---|---|---|---|
| PSSI2021SAY | PSSI2021SAY,115 | 934056564115 | SOT353 | Order product |
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Constant current source in SOT353 package
Resistor-equipped PNP transistor with two diodes on one chip in a SOT353 (SC-88A) plastic package. Stabilized output current of between 15 uA and 50 mA by connection of an external resistor between pins 4 and 5.
Features and benefits
One chip integrated constant current source
Output current setting by use of an external resistor
Very small package
Reduces component count and board space
AEC-Q101 qualified
Applications
Automotive applications
Generic constant current source
Constant current LED driver
Active bias control for audio amplifiers
Parametrics
| Type number | Package version | Package name | Size (mm) | VSUP [max] (V) | Limiting IO with external resistor [max] (mA) | IO [max] (mA) | Ptot [max] (mW) | channel type (e) | Automotive qualified |
|---|---|---|---|---|---|---|---|---|---|
| PSSI2021SAY | SOT353 | TSSOP5 | 2.1 x 1.25 x 0.95 | 75.0 | 50.0 | 0.02 | 335.0 | PNP | Y |
Package
| Type number | Orderable part number, (Ordering code (12NC)) | Status | Marking | Package | Package information | Reflow-/Wave soldering | Packing |
|---|---|---|---|---|---|---|---|
| PSSI2021SAY | PSSI2021SAY,115 (934056564115) |
Active | S1% |
TSSOP5 (SOT353) |
SOT353 |
REFLOW_BG-BD-1
WAVE_BG-BD-1 |
SOT353_115 |
Environmental information
| Type number | Orderable part number | Chemical content | RoHS | RHF-indicator |
|---|---|---|---|---|
| PSSI2021SAY | PSSI2021SAY,115 | PSSI2021SAY |
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Documentation (12)
| File name | Title | Type | Date |
|---|---|---|---|
| PSSI2021SAY | Constant current source in SOT353 package | Data sheet | 2025-04-08 |
| AN90063 | Questions about package outline drawings | Application note | 2025-06-13 |
| SOT353 | 3D model for products with SOT353 package | Design support | 2019-01-18 |
| Nexperia_package_poster | Nexperia package poster | Leaflet | 2020-05-15 |
| TSSOP5_SOT353_mk | plastic, surface-mounted package; 5 leads; 1.3 mm pitch; 2 mm x 1.25 mm x 0.95 mm body | Marcom graphics | 2017-01-28 |
| SOT353 | plastic, surface-mounted package; 5 leads; 0.65 mm pitch; 2.1 mm x 1.25 mm x 0.95 mm body | Package information | 2022-05-31 |
| SOT353_115 | Tape reel SMD; standard product orientation 12NC ending 115 | Packing information | 2020-04-27 |
| PSSI2021SAY_Nexperia_Product_Reliability | PSSI2021SAY Nexperia Product Reliability | Quality document | 2025-05-28 |
| REFLOW_BG-BD-1 | Reflow soldering profile | Reflow soldering | 2021-04-06 |
| PSSI2021SAY | PSSI2021SAY SPICE model | SPICE model | 2025-07-10 |
| MAR_SOT353 | MAR_SOT353 Topmark | Top marking | 2013-06-03 |
| WAVE_BG-BD-1 | Wave soldering profile | Wave soldering | 2021-09-08 |
Support
If you are in need of design/technical support, let us know and fill in the answer form we'll get back to you shortly.
Longevity
The Nexperia Longevity Program is aimed to provide our customers information from time to time about the expected time that our products can be ordered. The NLP is reviewed and updated regularly by our Executive Management Team. View our longevity program here.
Models
| File name | Title | Type | Date |
|---|---|---|---|
| PSSI2021SAY | PSSI2021SAY SPICE model | SPICE model | 2025-07-10 |
| SOT353 | 3D model for products with SOT353 package | Design support | 2019-01-18 |
Ordering, pricing & availability
| Type number | Orderable part number | Ordering code (12NC) | Status | Packing | Packing Quantity | Buy online |
|---|---|---|---|---|---|---|
| PSSI2021SAY | PSSI2021SAY,115 | 934056564115 | Active | SOT353_115 | 3,000 |
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Sample
As a Nexperia customer you can order samples via our sales organization.
If you do not have a direct account with Nexperia our network of global and regional distributors is available and equipped to support you with Nexperia samples. Check out the list of official distributors.
How does it work?
The interactive datasheets are based on the Nexperia MOSFET precision electrothermal models. With our interactive datasheets you can simply specify your own conditions interactively. Start by changing the values of the conditions. You can do this by using the sliders in the condition fields. By dragging the sliders you will see how the MOSFET will perform at the new conditions set.