ChipApex | Global Electronic Components Supplier
SEARCH
Search Product
Search Post
— IC芯片 | 连接器 | 传感器 | 被动器件 —
Consult the customer manager about the wholesale price.
consultation hotline：86-132-6715-2157
email：[email protected]
Contact the product manager for consultation. One-stop consultation is available.
Do you want a lower wholesale price? Please send us your inquiry and we will reply immediately.
Product Detailed Parameters
- Description：MMDT521LW
- Series：*
- Mfr：Diotec Semiconductor
- Package：Bulk
- Resistors Included：-
- Transistor Type：-
- Current - Collector (Ic) (Max)：-
- Voltage - Collector Emitter Breakdown (Max)：-
- Resistor - Base (R1)：-
- Resistor - Emitter Base (R2)：-
- DC Current Gain (hFE) (Min) @ Ic, Vce：-
- Vce Saturation (Max) @ Ib, Ic：-
- Current - Collector Cutoff (Max)：-
- Frequency - Transition：-
- Power - Max：-
- Grade：-
- Qualification：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
Download product information
Overview
The MMDT521LW is an SMD digital NPN transistor manufactured by Diotec Semiconductor, housed in a SOT-323 package. It integrates bias resistors to reduce component count and board space. Key electrical parameters include a collector-emitter voltage (VO) of 50 V, a continuous collector current (IO) of 100 mA, and power dissipation (Ptot) of 200 mW. The device features a typical base resistor (R1) of 4.7 kΩ and an emitter resistor (R2) of 4.7 kΩ. It operates within a junction temperature range of -55°C to +150°C and has a transition frequency (fT) of 250 MHz.
Feature Summary
- Integrates bias resistor combinations for cost and space savings
- Compliant with RoHS, REACH, and Conflict Minerals regulations
Applications
- Digital controls
- Switching
- Signal processing
Procurement Notes
Verify the specific ordering suffix when purchasing. Standard versions are commercial grade. Suffixes such as -Q indicate AEC-Q101 compliance, while -AQ denotes parts currently undergoing automotive qualification. Confirm the exact marking code Y8 corresponds to the required variant before finalizing procurement orders.
Selection Notes
Select this component for applications requiring a compact NPN digital transistor with integrated biasing. Ensure the 4.7 kΩ input resistance matches the drive requirements. Verify that the 50 V voltage rating and 100 mA current capacity exceed the circuit's maximum operating conditions. Check if automotive qualification is necessary for the target application environment.
Part Context
The MMDT521LW belongs to the MMDT521DW through MMDT521ZW series from Diotec Semiconductor. This family offers various resistor combinations within the same SOT-323 footprint. The L variant specifically provides 4.7 kΩ base and emitter resistors, distinguishing it from other series members like the DW or EW variants which have different resistance values.
Replacement Considerations
Other MMDT521 series devices share the SOT-323 package but differ in internal resistor values. Direct pin-compatible replacements must match the 4.7 kΩ R1 and R2 configuration. Verify thermal characteristics and switching speeds against the original design requirements when substituting.
