1. General Description:

️· The MPSA92 and MPSA93 are NPN transistors, part of the MPSA series. They are designed for general-purpose amplification and switching applications. They are small signal transistors.

2. Electrical Characteristics (Absolute Maximum Ratings):

️· Collector-Emitter Voltage (VCE): 40V (typical for both)
️· Collector-Base Voltage (VCB): 40V (typical for both)
️· Emitter-Base Voltage (VEB): 5V (typical for both)
️· Collector Current (Continuous, Ic): -200mA (typical for both)
️· Emitter Current (Continuous, Ie): -300mA (typical for both)
️· Power Dissipation (Pc): 625mW (typical for both)
️· Operating Temperature Range: -55°C to +150°C (typical for both)

3. Electrical Characteristics (DC Characteristics):

️· Collector Cutoff Current (ICBO): ≤ 10 nA (typical for both). A low ICBO is desirable.
️· Forward Current Gain (hFE): This is where the main difference lies.
- MPSA92: hFE ranges from 100 to 1000 at IC = 10mA, VCE = 5V.
- MPSA93: hFE ranges from 40 to 280 at IC = 10mA, VCE = 5V. The MPSA93 has a lower hFE range compared to the MPSA92.
️· Reverse Collector Current (ICER): ≤10mA at VCB = 40V (typical for both).
️· Forward Voltage (VE): ≤ 0.8V at IC = 100mA (typical for both).

4. Electrical Characteristics (AC Characteristics):

️· Transition Frequency (fT): This value indicates how high the operating frequency can be before the transistor's gain starts to roll off.
- MPSA92: fT ≥ 50 MHz at VCE = -20V, IC = -10mA.
- MPSA93: No specified fT value in the provided datasheet.
️· Collector Output Capacitance (Cob):
- MPSA92: Cob = 6.0 pF at VCB = -20V, VE = 0, f = 1 MHz.
- MPSA93: Cob = 8.0 pF at VCB = -20V, VE = 0, f = 1 MHz.

5. Key Differences Between MPSA92 and MPSA93:

️· Current Gain (hFE): The MPSA92 has a significantly higher current gain range (100-1000) compared to the MPSA93 (40-280). This means the MPSA92 will amplify the input signal more than the MPSA93 for a given input.
️· Collector Output Capacitance: The MPSA93 has a slightly higher collector output capacitance than the MPSA92.
️· Transition Frequency: The MPSA92 has a specified transition frequency of 50 MHz whereas the MPSA93 does not.

6. Other Notes from the Datasheet:

️· Pulse Testing: The absolute maximum ratings are for pulsed operation.
️· Bonding Wire Limitation: There are bonding wire limitations that need to be considered in circuit design.



In Summary:

️· If you need a higher gain transistor, choose the MPSA92.
️· If you need a transistor with lower gain, choose the MPSA93.
️· Always check the entire datasheet for specific application requirements and limitations.