SN74CB3T3257PWRE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74CB3T3257PWRE4 is a 3.3 V quad 2-to-1 bidirectional bus exchanger from Texas Instruments in a 16-pin TSSOP package. It features near-zero propagation delay switching with active-low enable control, suitable for voltage-level bus multiplexing in mixed 3.3 V systems. RoHS compliant with tape and reel packaging for automated assembly.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74CB3T3257PWRE4 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
Key Features
- Quad 2-to-1 bidirectional bus exchange switch with near-zero propagation delay
- CB3T family for 3.3 V operation with TTL-compatible input logic thresholds
- Active-low enable input for straightforward bus selection control
- Low ON-resistance minimizes signal distortion in high-speed data path switching
- 16-pin TSSOP package for compact PCB layouts in high-density digital designs
- RoHS compliant with JESD-609 e4 lead-free finish
Applications
The SN74CB3T3257PWRE4 is used in data bus multiplexing, signal routing, and test point switching applications in servers, networking equipment, and FPGA development platforms. Its bidirectional transparent switching with low propagation delay makes it ideal for bank switching in memory interleave designs and multi-master bus arbitration circuits.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | BIDIRECTIONAL |
| Family | CB3T/3VT |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS EXCHANGER |
| Number of Bits | 2 |
| Number of Functions | 4 |
| Number of Ports | 3 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.02mA |
| Prop. Delay@Nom-Sup | 0.15ns |
| Propagation Delay (tpd) | 0.25ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 3.6V |
| Supply Voltage-Min (Vsup) | 2.3V |
| Supply Voltage-Nom (Vsup) | 2.5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| 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 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74CB3T3257PWRE4:
Bus Exchanger, CB3T/3VT Series, 4-Func, 2-Bit, True Output, CMOS, PDSO16
Frequently Asked Questions
What is the SN74CB3T3257PWRE4 and what does it do?
The SN74CB3T3257PWRE4 is a 3.3 V quad 2-to-1 bidirectional bus exchanger (multiplexer) from Texas Instruments. It routes signals between two buses using an active-low enable and select input, supporting bidirectional data flow with near-zero propagation delay. It is commonly used to multiplex address or data lines in mixed 3.3 V digital systems.
What package does the SN74CB3T3257PWRE4 use and what are its key electrical characteristics?
The SN74CB3T3257PWRE4 is housed in a 16-pin TSSOP (PDSO-G16) package with tape-and-reel (PWRE4) packaging for automated PCB assembly. It operates from a 3.3 V supply, supports a load capacitance of up to 50 pF, and uses CMOS-level logic. The device is part of the CB3T/3VT family designed for low-voltage bus switching applications.
Is the SN74CB3T3257PWRE4 RoHS compliant and lead-free?
Yes, the SN74CB3T3257PWRE4 is fully RoHS compliant and lead-free, as indicated by the JESD-609 code e4 and the Pb-free code confirmation. The 'E4' suffix in the part number denotes that it meets environmental compliance requirements, making it suitable for use in consumer electronics, industrial, and automotive applications that require green manufacturing standards.
How does the active-low enable control work on the SN74CB3T3257PWRE4?
The SN74CB3T3257PWRE4 uses an active-low enable (OE#) signal to control whether the bus exchanger passes signals or enters a high-impedance state. When OE# is driven low, the selected channel is enabled and data flows bidirectionally between the A and B ports. When OE# is high, all outputs are disabled (high-Z), effectively isolating the connected buses and preventing signal contention.
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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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