SN74CBT16245DLG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74CBT16245DLG4 is an 8-channel 1:1 TTL-compatible CBT bus switch with common control, rated for 5 V operation, and housed in a 48-pin SSOP package. It supports 50 pF load capacitance with Pb-free JESD-609 e4 compliance. Available in stock with competitive pricing and worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 48
- Lifecycle
- OBSOLETE
- Datasheet
- SN74CBT16245DLG4 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 SN74CBT16245DLG4?
- 8-channel 1:1 TTL-compatible CMOS bus switch with common output enable, providing transparent 5 V bus switching with near-zero propagation delay for high-speed data paths
- 50 pF rated load capacitance per channel enabling reliable switching on standard PCB traces and memory bus designs at 5 V logic levels
- 48-pin SSOP package (JESD-30 R-PDSO-G48) offering compact high-density integration of 8 bidirectional bus switch channels in a narrow-pitch SMD outline
What is SN74CBT16245DLG4 used for?
The SN74CBT16245DLG4 is used in memory bus switching, ISA/PCI data path isolation, and processor-to-peripheral bus routing where 8-bit 5 V TTL-compatible transparent switching with common control is needed. It suits hot-swap backplane designs where the common enable can isolate all 8 channels simultaneously during card insertion to prevent bus contention. The 48-pin SSOP package enables compact integration in server, industrial PC, and telecom line card designs that require dense 5 V bus switch functionality.
What are the specifications of SN74CBT16245DLG4?
| YTEOL | 0 |
| Additional Feature | TTL COMPATIBLE BUS SWITCH |
| Control Type | COMMON CONTROL |
| Count Direction | UNIDIRECTIONAL |
| Family | CBT/FST/QS/5C/B |
| JESD-30 Code | R-PDSO-G48 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Number of Bits | 8 |
| Number of Functions | 2 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SSOP48,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, SHRINK PITCH |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.003mA |
| Prop. Delay@Nom-Sup | 0.25ns |
| Propagation Delay (tpd) | 0.35ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4V |
| Supply Voltage-Nom (Vsup) | 4.5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.635mm |
| 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 SN74CBT16245DLG4 datasheet?
SN74CBT16245DLG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74CBT16245DLG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the SN74CBT16245DLG4's common control enable simplify 8-bit bus isolation in backplane designs?
The common control input simultaneously enables or disables all 8 switch channels with a single logic signal, eliminating the need for 8 individual enable drivers. In a hot-swap backplane where a card must be electrically isolated before insertion, asserting the single enable line disconnects all 8 data bits at once within nanoseconds. This common-control architecture is particularly efficient in 8-bit memory buses and PCI/ISA peripheral interfaces where whole-byte isolation is required on power-up sequencing events.
What propagation delay does the SN74CBT16245DLG4 add to a 5 V data bus, and how does it compare to active buffers?
As a passive FET bus switch, the SN74CBT16245DLG4 adds near-zero propagation delay — typically less than 0.5 ns — compared to 3 ns to 7 ns for active bidirectional buffers such as 74LVCH16245. With a 50 pF rated load capacitance and low on-resistance of a few ohms per channel, signal integrity is maintained on 5 V CMOS and TTL buses operating below 100 MHz. For latency-sensitive processor-to-SRAM or processor-to-FPGA interconnects this delay advantage is critical.
Can SN74CBT16245DLG4 operate bidirectionally, and what current handling does it provide per channel?
Yes. CBT bus switches are inherently bidirectional — current flows from A to B or B to A depending on which side has the higher voltage, since the FET switch operates symmetrically. The device supports standard TTL drive currents consistent with JEDEC 5 V logic families. Each channel tolerates the full 5 V bus swing. The 50 pF specified load capacitance per channel is compatible with typical memory and logic bus loads, ensuring the switch does not degrade signal transition times on standard two-layer or four-layer PCBs.
How does the 48-pin SSOP package of SN74CBT16245DLG4 compare to TSSOP alternatives for board space optimization?
The SSOP-48 (JESD-30 R-PDSO-G48) has a 0.635 mm pin pitch and a body approximately 12.5 mm wide, providing 48 pins in a narrow outline suitable for dense PCBs. Compared to TSSOP-48 with 0.5 mm pitch, the SSOP allows slightly wider pin spacing for improved hand-soldering and optical inspection yield. For an 8-channel bus switch, integrating all 8 bidirectional paths plus control and power pins into a single SSOP-48 saves at least 3 to 4 separate SOT-23 or SO-8 discrete switch devices that would otherwise be required.
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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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