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Texas Instruments SN74CBT3257RGYRG4
- Part No.:
- SN74CBT3257RGYRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
SN74CBT3257RGYRG4.pdf
- Description:
- IC MUX/DEMUX 4 X 2:1 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,734
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Product details
Overview
SN74CBT3257RGYRG4 from Texas Instruments is a 4-bit 1-of-2 FET multiplexer/demultiplexer with 5-Ω on-state resistance, TTL-compatible control inputs (VIH = 2 V, VIL = 0.8 V), and operation across −40°C to 85°C. It routes bidirectional data between A and B1/B2 ports under S and OE control, used in high-speed bus switching applications such as memory address/data routing in industrial controllers.
For engineers reviewing the SN74CBT3257RGYRG4 datasheet, SN74CBT3257RGYRG4 pinout, SN74CBT3257RGYRG4 application, or SN74CBT3257RGYRG4 equivalent, key selection criteria include on-resistance matching (5–7 Ω), propagation delay ≤0.35 ns at 4 V, OE/S timing compatibility with TTL logic families, and thermal performance (θJA = 39°C/W) in the 16-pin QFN RGY package.
Technical Context
The SN74CBT3257RGYRG4 implements four independent bilateral analog switches controlled by a shared select (S) and output-enable (OE) input. Each switch connects one A terminal to either corresponding B1 or B2 terminal based on S state, with OE disabling all paths when high.
Its FET-based architecture delivers low on-resistance (5–7 Ω typical), minimal charge injection (<0.5 pC), and rail-to-rail analog signal handling up to VCC = 5.5 V. Switching is fully bidirectional, supporting data flow from A→B or B→A without directionality constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω - ensures minimal voltage drop and signal attenuation for 64 mA channel current. |
| Propagation delay (tpd) | 0.25–0.35 ns at VCC = 4–5 V - enables sub-nanosecond bus switching in high-speed digital systems. |
| Supply voltage range | 4–5.5 V - compatible with standard 5-V TTL and mixed-voltage logic interfaces. |
| Control input thresholds | VIH = 2 V, VIL = 0.8 V - guarantees reliable recognition of standard TTL logic levels. |
| Off-state capacitance (Cio(OFF)) | 4 pF - limits crosstalk and loading on inactive channels in dense PCB layouts. |
| Thermal resistance (θJA) | 39°C/W - supports sustained operation in compact QFN packages without forced airflow. |
| Operating temperature | −40°C to 85°C - qualified for industrial ambient environments including factory automation equipment. |
Pinout & Package
SN74CBT3257RGYRG4 is housed in a 16-pin QFN package (RGY) with exposed thermal pad, 3.5 mm × 4.5 mm footprint, and 0.65 mm pitch. The package supports reflow soldering per JEDEC J-STD-020 and provides low thermal resistance (39°C/W) for power-dissipating operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 11, 12, 13, 14, 15 | Data terminals (1A–4A, 1B1–4B1, 1B2–4B2) | Bidirectional analog/digital signal paths; each A port connects to corresponding B1 or B2 based on S and OE. |
| 7 | GND | Power ground reference for internal FET bias and noise immunity. |
| 8 | VCC | Positive supply (4–5.5 V); powers internal level shifters and switch drivers. |
| 9 | OE | Active-low output enable; high state disconnects all A–B paths (high-impedance isolation). |
| 10 | S | Select control; determines whether A ports connect to B1 (S = L) or B2 (S = H). |
Key Features
| Feature | Design Value |
|---|---|
| Low on-resistance | 5–7 Ω ensures <50 mV drop at 64 mA, preserving signal integrity in 5-V bus applications. |
| TTL-compatible control | VIH = 2 V / VIL = 0.8 V eliminates need for level shifters when interfacing with legacy 5-V microcontrollers. |
| Bidirectional signal routing | Supports data flow in either direction without polarity or voltage-level restrictions across A/B ports. |
| Fast switching | 0.25 ns propagation delay enables use in >1 GHz clock domain crossing and high-frequency test equipment. |
| Low off-capacitance | 4 pF Cio(OFF) minimizes capacitive coupling between active and disabled channels in multi-channel systems. |
Applications
| Memory Bus Switching | Test Equipment Signal Routing |
|---|---|
|
Use Scenario: Dynamically rerouting address/data lines between two memory banks in an FPGA-based controller. IC Role / Device Role / Timing Role: Bidirectional 4-bit multiplexer enabling bank-select-driven path switching without interrupting system clock. Use Value: 5-Ω Ron and 0.25 ns tpd prevent setup/hold violations during real-time memory arbitration. |
Use Scenario: Channel selection in automated test equipment connecting DUT signals to multiple measurement instruments. IC Role / Device Role / Timing Role: Low-crosstalk analog/digital switch isolating unused instrument inputs while maintaining signal fidelity. Use Value: 4 pF off-capacitance and rail-to-rail operation preserve rise time and amplitude of 100 MHz test waveforms. |
| Industrial I/O Expansion | Legacy Interface Bridging |
|
Use Scenario: Expanding GPIO count on a PLC CPU by time-multiplexing sensor inputs across shared ADC channels. IC Role / Device Role / Timing Role: High-reliability analog switch enabling sequential sampling of 8 sensors using 4 ADC inputs. Use Value: −40°C to 85°C rating and 128 mA continuous channel current support long-term deployment in uncontrolled cabinets. |
Use Scenario: Interfacing modern 3.3-V microcontrollers with legacy 5-V peripheral buses (e.g., ISA-style expansion). IC Role / Device Role / Timing Role: Level-agnostic bidirectional bridge maintaining signal timing across voltage domains. Use Value: TTL-compatible inputs accept 3.3-V logic highs directly; 5.5-V max VCC allows safe 5-V bus termination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384PWR | 8-bit configuration, higher Ron (7–10 Ω), 20-pin TSSOP package | Higher channel count but larger footprint and slower tpd (0.4 ns) | Choose when expanding to 8-bit bus width outweighs added propagation delay and board area. |
| 74LVC1G3157DCKR | Single-channel, lower Ron (3–5 Ω), 6-pin SC70 package, 1.65–5.5 V supply | Not pin-compatible; requires four devices for equivalent 4-bit function | Prefer for space-constrained designs needing ultra-low Ron and flexible voltage scaling down to 1.65 V. |
Compared with SN74CBT3257RGYRG4, SN74CBTD3384PWR offers more channels but increases layout complexity and timing uncertainty, while 74LVC1G3157DCKR delivers superior on-resistance and voltage flexibility at the cost of discrete implementation and higher assembly effort.
Availability
SN74CBT3257RGYRG4 is available at Aetrix Electronics and suitable for industrial control systems, automated test equipment, and legacy interface bridging requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for SN74CBT3257RGYRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The SN74CBT3257RGYRG4 belongs to TI's CBT (CrossBar Technology) logic family, engineered for high-speed, low-distortion analog/digital signal routing in bus-switching and interface consolidation applications.
FAQ
What is the maximum continuous current rating per channel for the SN74CBT3257RGYRG4?
The SN74CBT3257RGYRG4 supports a continuous channel current of 128 mA per switch path. This rating applies under recommended operating conditions (VCC = 4–5.5 V, TA = −40°C to 85°C) and ensures reliable conduction without thermal derating in typical industrial PCB layouts with moderate copper pour.
Does the SN74CBT3257RGYRG4 support bidirectional signal flow between A and B ports?
Yes, the SN74CBT3257RGYRG4 supports fully bidirectional signal flow: data can pass from A to B1/B2 or from B1/B2 to A without restriction. Its FET-based switch architecture imposes no polarity or directionality constraints, making it suitable for both digital bus sharing and analog signal routing applications.
What is the thermal resistance (θJA) of the SN74CBT3257RGYRG4 in its RGY package?
The SN74CBT3257RGYRG4 in the RGY (16-pin QFN) package has a junction-to-ambient thermal resistance (θJA) of 39°C/W, measured per JESD 51-5. This value assumes standard PCB layout with thermal vias under the exposed pad and 1-in² 2-oz copper pour, enabling operation up to 85°C ambient without forced cooling.
Can the SN74CBT3257RGYRG4 operate with a 3.3-V supply voltage?
No, the SN74CBT3257RGYRG4 requires a minimum supply voltage of 4 V per its recommended operating conditions. While absolute maximum ratings allow VCC down to −0.5 V, functional operation below 4 V is not guaranteed - VIH and VIL thresholds (2 V / 0.8 V) and on-resistance performance are specified only from 4 V onward.
How does the OE pin function on the SN74CBT3257RGYRG4?
The OE (output-enable) pin on the SN74CBT3257RGYRG4 is active-low: when OE = L, the selected A–B paths conduct normally; when OE = H, all four switch paths enter high-impedance state, electrically isolating A and B terminals. This enables hot-swap capability and bus contention prevention in multi-master systems.
SN74CBT3257RGYRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VQFN (4x3.5)
SN74CBT3257RGYRG4 FAQ
1.How can I place an order for SN74CBT3257RGYRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3257RGYRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74CBT3257RGYRG4 reliable?
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5.How can I obtain technical support or documentation for SN74CBT3257RGYRG4?
For technical support, including SN74CBT3257RGYRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3257RGYRG4 requirements.
6.How does Aetrix verify that SN74CBT3257RGYRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3257RGYRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74CBT3257RGYRG4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3257RGYRG4?
All SN74CBT3257RGYRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3257RGYRG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74CBT3257RGYRG4 part is unused and in its original packaging.
Return procedure for SN74CBT3257RGYRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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