SN74CBT3244DBRG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74CBT3244DBRG4 is an octal FET bus switch providing bidirectional signal routing across 8 channels with TTL-compatible control inputs and active-low enable in a 20-pin SSOP package. It operates at near-zero propagation delay with 50 pF load capacitance rating and supports 3.3 V to 5 V bus switching applications. A cost-effective solution for bus isolation, multiplexing, and signal steering in digital logic systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74CBT3244DBRG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74CBT3244DBRG4?
- 8-channel bidirectional FET bus switch with near-zero propagation delay for transparent signal routing without timing budget impact
- TTL-compatible active-low enable control supports direct interface to 3.3 V and 5 V logic families with 50 pF load capacitance
- 20-pin SSOP package in RoHS-compliant (e4) lead-free finish enables high-density PCB layouts in space-constrained digital systems
What is SN74CBT3244DBRG4 used for?
The SN74CBT3244DBRG4 is used for bus isolation and multiplexing in memory interface circuits, microprocessor address/data bus expansion, and backplane switching where 8 bidirectional signal paths must be transparently connected or disconnected. Its near-zero propagation delay and TTL-compatible control also make it effective for hot-swap bus switching in industrial computing boards and communication equipment requiring 3.3 V or 5 V bus compatibility.
What are the specifications of SN74CBT3244DBRG4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | TTL COMPATIBLE BUS SWITCH |
| Control Type | ENABLE LOW |
| Count Direction | BIDIRECTIONAL |
| Family | CBT/FST/QS/5C/B |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SSOP20,.3 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, SHRINK PITCH |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.003mA |
| Prop. Delay@Nom-Sup | 0.25ns |
| Propagation Delay (tpd) | 0.25ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| 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 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
Where can I find the SN74CBT3244DBRG4 datasheet?
SN74CBT3244DBRG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74CBT3244DBRG4?
Compatible alternatives and drop-in replacements for SN74CBT3244DBRG4:
Bus Driver, CBT/FST/QS/5C/B Series, 2-Func, 12-Bit, True Output, CMOS, PDSO56
Frequently Asked Questions
How many bidirectional channels does SN74CBT3244DBRG4 provide and what propagation delay can be expected?
The SN74CBT3244DBRG4 provides 8 bidirectional FET bus switch channels with near-zero propagation delay, typically under 0.25 ns, making it effectively transparent to the connected logic signals. This compares favorably to standard buffer ICs with 2 ns to 5 ns delays, allowing it to be inserted into critical timing paths without impacting 50 pF loaded signal integrity in 3.3 V and 5 V digital buses.
In a memory bus design, how does SN74CBT3244DBRG4 enable isolation between multiple memory banks?
By asserting the active-low enable pin, the SN74CBT3244DBRG4 disconnects all 8 bidirectional signal paths simultaneously, isolating one memory bank from the shared address or data bus. This prevents bus contention when switching between 2 or more memory devices sharing a common 8-bit bus. The 50 pF load capacitance rating and TTL-compatible control signal ensure reliable switching with standard CMOS and TTL-level microcontroller outputs at 3.3 V or 5 V.
What package does SN74CBT3244DBRG4 use and how does the G4 suffix affect sourcing?
The SN74CBT3244DBRG4 uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, occupying approximately 7.8 mm x 3.9 mm of PCB area. The G4 suffix indicates the part is from a general-purpose production flow, available on tape-and-reel for SMT assembly. The RoHS-compliant lead-free finish (JESD-609 e4) ensures compliance with EU RoHS and automotive supply chain requirements for halogen-free electronic assemblies.
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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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