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Product Detailed Parameters
- Description：DIODE CUR REG 350MW SOT23-3
- Series：SST500
- Mfr：Linear Integrated Systems, Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Voltage - Anode - Cathode (Vak)(Max)：-
- Regulator Current (Max)：1mA
- Voltage - Limiting (Max)：900mV
- Power - Max：350mW
- Applications：-
- Operating Temperature：-55°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-236-3, SC-59, SOT-23-3
- Supplier Device Package：SOT-23-3
- Grade：-
- Qualification：-
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Overview
The SST505 is a current regulating diode from the SST500 series by Linear Integrated Systems, designed to maintain a constant forward current across a wide voltage range. It operates within a peak operating voltage of up to 50 V and dissipates a maximum continuous power of 350 mW. The device specifies a nominal forward current of 1.0 mA with a tolerance range of 0.800 mA to 1.200 mA. Key electrical parameters include a dynamic impedance of 1.0 MΩ and a knee impedance of 0.3 MΩ at 25 °C. It utilizes a SOT-23 3L package where pins 2 and 3 are internally shorted.
Feature Summary
- Maintains stable current regulation without requiring external biasing circuits or gate-source voltage.
- Replaces legacy Siliconix/Vishay SST502 series components while offering improved performance consistency.
- Operates reliably in extreme thermal environments with junction temperatures ranging from -55°C to +150°C.
Applications
- Test instrumentation circuits
- Medical equipment signal conditioning
- Sensor biasing networks
Procurement Notes
Verify the specific ordering suffix against official documentation to confirm packaging type and RoHS compliance status. Ensure the component matches the required forward current tolerance for your circuit design. Confirm that the manufacturer designation aligns with Linear Integrated Systems specifications before finalizing procurement orders.
Selection Notes
Select this model when a precise 1.0 mA regulation point is required within the SST500 family. Consider the dynamic impedance characteristics for high-impedance applications. Verify that the 50 V peak operating voltage accommodates the maximum potential difference across the load in your specific circuit topology.
Part Context
This component belongs to the SST500 series of current regulating diodes manufactured by Linear Integrated Systems. The series provides a broad spectrum of fixed current options ranging from 0.192 mA to 5.6 mA. All variants share identical physical packaging and general electrical characteristics, differing primarily in their specified forward current values.
Replacement Considerations
The datasheet explicitly states that this series replaces the Siliconix/Vishay SST502 series. Engineers transitioning from older designs should verify pin compatibility and thermal derating requirements to ensure seamless integration into existing PCB layouts.
FAQ
How are the pins configured in the SOT-23 3L package?
Pins 2 and 3 must be shorted together via a PCB trace to function correctly as a three-terminal current regulating diode.
What is the maximum reverse voltage rating?
The device can withstand a reverse voltage of 0.8 V when the reverse current is 1 mA.
Does the device require an external gate-source voltage to operate?
No, the device requires no biasing and operates with VGS = 0V.
