SN74LS641-1DWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74LS641-1DWG4 is an 8-channel bidirectional bus transceiver with open-collector outputs and common direction control. Features 24 mA output sink current in a 20-pin SOIC package. Available from stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74LS641-1DWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74LS641-1DWG4?
- 8-channel bidirectional bus transceiver with open-collector outputs capable of sinking 24 mA, enabling wired-OR bus configurations
- Common direction control pin selects A-to-B or B-to-A data flow across all 8 channels simultaneously for simplified bus management
- 20-pin SOIC package from Texas Instruments LS logic family, compatible with 5 V TTL systems and legacy backplane designs
What is SN74LS641-1DWG4 used for?
The SN74LS641-1DWG4 is used in 8-bit backplane data bus interfaces, industrial process-control boards, and multi-board VME or ISA systems requiring bidirectional data transfer with wired-OR capability. Its open-collector outputs allow multiple transceivers to share a common bus without bus contention, which is essential in memory expansion and peripheral interface designs. The device fits well in retrofitting legacy TTL logic systems that need reliable 5 V bus buffering with directional control.
What are the specifications of SN74LS641-1DWG4?
| YTEOL | 0 |
| Additional Feature | WITH DIRECTION CONTROL |
| Control Type | COMMON CONTROL |
| Count Direction | BIDIRECTIONAL |
| Family | LS |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Logic IC Type | BUS TRANSCEIVER |
| Max I(ol) | 0.024A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Number of Ports | 2 |
| Output Characteristics | OPEN-COLLECTOR |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 95mA |
| Prop. Delay@Nom-Sup | 25ns |
| Propagation Delay (tpd) | 25ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Where can I find the SN74LS641-1DWG4 datasheet?
SN74LS641-1DWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74LS641-1DWG4?
Compatible alternatives and drop-in replacements for SN74LS641-1DWG4:
Bus Transceiver, LS Series, 1-Func, 8-Bit, Inverted Output, TTL, PDIP20
Frequently Asked Questions
What output sink current does the SN74LS641-1DWG4 support and how does the open-collector output enable wired-OR bus sharing?
The SN74LS641-1DWG4 open-collector outputs sink up to 24 mA (I_OL maximum), allowing multiple devices to share a single bus line with a common pull-up resistor. When any output asserts logic low, the bus line is pulled low; when all outputs are high-impedance, the pull-up holds the line high. This wired-OR topology supports 8 channels of bidirectional data across devices without bus contention.
How does the direction control signal on SN74LS641-1DWG4 work for a CPU-to-memory bus interface?
The SN74LS641-1DWG4 uses a single common DIR control pin that simultaneously sets all 8 channels to either A-to-B or B-to-A transmission. For a CPU write cycle DIR is asserted one way and for a read cycle it is inverted, typically driven by the CPU's R/W control line. This single-pin direction switching reduces glue logic in 8-bit memory bus designs operating at 5 V TTL levels.
What package and pin pitch does the SN74LS641-1DWG4 use, and how does the 20-pin SOIC compare to the DIP alternative for board density?
The SN74LS641-1DWG4 comes in a 20-pin SOIC (JEDEC R-PDSO-G20) with a 1.27 mm pin pitch, occupying roughly 49 mm² of board area. Compared to a 20-pin DIP at 2.54 mm pitch which occupies about 185 mm², the SOIC saves over 70% of board space, making it the preferred choice for compact industrial controller PCBs while maintaining the same 8-channel bus transceiver functionality.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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