This specification covers the performance requirements for NPN, silicon, medium power, 2N497, 2N498, 2N656 and 2N657 transistors. One level of product assurance (JAN) is provided for encapsulated devices as specified in MIL-PRF-19500/74. The device package outlines are as follows: TO–205AA (formerly modified TO–5) (without suffix S) or a TO–205AD (formerly modified TO–39) (with suffix S) in accordance with all encapsulated device types.