| 1638681 | U4055B | Low-Voltage Electronic Speech Circuit with Dialer Interface | TEMIC |
| 1638682 | U4055B1 | Low-Voltage Electronic Speech Circuit with Dialer Interface | TEMIC |
| 1638683 | U4056B1 | Low-voltage Electronic Speech circuit with Dialer Interface | TEMIC |
| 1638684 | U406 | Dual N-Channel JFET Switch | Calogic |
| 1638685 | U406 | Dual N-Channel JFET JFET Switch | Intersil |
| 1638686 | U406 | Low Noise, Low Drift, Monolithic Dual, N-Channel JFET | Linear Systems |
| 1638687 | U406 | Trans JFET N-CH 4-Pin TO-71 | New Jersey Semiconductor |
| 1638688 | U406 | Monolithic Low Noise | Vishay |
| 1638689 | U4065B | FM front end | Atmel |
| 1638690 | U4065B | FM Receiver | TEMIC |
| 1638691 | U4065B-AFL | FM Receiver IC | Atmel |
| 1638692 | U4065B-AFL | FM Receiver | TEMIC |
| 1638693 | U4065B-AFL3 | FM Receiver IC | Atmel |
| 1638694 | U4065B-AFLG3 | FM Receiver | TEMIC |
| 1638695 | U406NL | Monolithic N-Channel JFET Duals | Vishay |
| 1638696 | U4070B-FP | Tone Ringer Interface | TEMIC |
| 1638697 | U4072B | Two-Tone Ringer for Telephone Sets | TEMIC |
| 1638698 | U4074B | Tone Ringer Interface | TEMIC |
| 1638699 | U4076B | Three-Tone Ringer for Telephone Sets | TEMIC |
|
| 1638700 | U4076B-FL | Three-Tone Ringer for Telephone Sets | TEMIC |
| 1638701 | U4078B | Tone Ringer Interface with DC/DC Converter | TEMIC |
| 1638702 | U4080B | Voice-Switched Circuit for Handsfree Operation | TEMIC |
| 1638703 | U4082B | Voice-switched circuit | Atmel |
| 1638704 | U4082B | Low-Voltage Voice-Switched IC for Hands-Free Operation | TEMIC |
| 1638705 | U4083 | Low-Power Audio Amplifier for Telephone Applications | TEMIC |
| 1638706 | U4083B | Low-power Audio Amplifier for Telephone Applications | Atmel |
| 1638707 | U4083B | Low-Power Audio Amplifier for Telephone Applications | TEMIC |
| 1638708 | U4083B-AFP | Low-Power Audio Amplifier for Telephone Applications | TEMIC |
| 1638709 | U4083B-AFPG3 | Low-Power Audio Amplifier for Telephone Applications | TEMIC |
| 1638710 | U4084B | Low-Voltage, Voice-Switched Circuit for Hands-Free Operation | TEMIC |
| 1638711 | U4087B | Low Voltage Voice Switch Interface Circuit for Hands-free Operation in Telephone | TEMIC |
| 1638712 | U4089B | Monolithic Integrated Feature Phone Circuit | TEMIC |
| 1638713 | U4089B-M | Monolithic Integrated Feature Phone IC | Atmel |
| 1638714 | U4089B-MFN | MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT | Atmel |
| 1638715 | U4089B-MFNG3 | MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT | Atmel |
| 1638716 | U4089B-P | Multi-standard feature phone circuit with voice switch | Atmel |
| 1638717 | U4089B-PFN | Monolithic Integrated Feature Phone Circuit | Atmel |
| 1638718 | U4089B-PFNG3 | Monolithic Integrated Feature Phone Circuit | Atmel |
| 1638719 | U4090B | Monolithic Integrated Feature Phone Circuit | Atmel |
| 1638720 | U4090B | Monolithic Integrated Feature Phone Circuit | TEMIC |
