The parts from the series DS2003xx are old National Semi parts and are all obsolete.
DS2003xx were offered in 16-SOIC and 16-PDIP packages
TI is offering a replacement parts ULN2003Ax
However need to keep in mind the following differences between these 2 parts
- TI defines the replacement ULN2003Ax as "same functionality and PIN-OUT but NOT an exact 1:1 equivalent".
There are some tech differences that should be reviewed in the data sheets of both parts:
DS2003xx and ULN2003Ax - The upper operating temperature of the p/n DS2003TM is up to 125 ℃ vs 105 ℃ in ULN2003AID which is an automotive version
- ULN2003xx have additional diode between the emitter and collector as per below drawing
The diode from emitter to collector in the ULN2003Ax is used as a parasitic structure, ensuring normal operation. The DS2003xx parts do not contain these parasitic diodes, which should not cause any issues unless you are forward biasing this diode with a reverse circuit.
Other vendors that Digi-Key carries like OnSemi, Diodes Inc, STMicroelectronics are also offering ULN2003xx as a replacement. All of them incorporate this additional diode between the emitter and collector.