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Texas Instruments SN74CBTLV3257DBQR
- Part No.:
- SN74CBTLV3257DBQR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBTLV3257DBQR.pdf
- Description:
- IC MUX/DEMUX 4 X 1:2 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,271
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Product details
Overview
SN74CBTLV3257 from Texas Instruments is a low-voltage 4-bit 1-of-2 FET multiplexer/demultiplexer with 5Ω on-state resistance, rail-to-rail switching capability, and Ioff partial-power-down support. It operates from 2.3V to 3.6V, delivers sub-6ns enable/disable times, and is used in high-speed bus switching for enterprise computing and wired networking systems.
For engineers reviewing the SN74CBTLV3257 datasheet, SN74CBTLV3257 pinout, SN74CBTLV3257 application, or SN74CBTLV3257 equivalent, key selection criteria include guaranteed 5Ω ron at 3.3V/64mA, −40°C to 85°C operating range (DBQ package), OE-active-low control logic, and JESD 78 Class II latch-up immunity.
Technical Context
The SN74CBTLV3257 implements four independent bidirectional analog switches controlled by a single select (S) input and global output-enable (OE) input. Each switch connects one common A port (1A–4A) to either B1 or B2 port based on S state, enabling 4-channel 2:1 multiplexing or demultiplexing.
Its FET-based architecture provides rail-to-rail signal handling, 3pF input capacitance, and 10.5pF off-state A-port capacitance. The Ioff feature limits leakage to 15µA when VCC = 0V and any I/O is biased 0–3.6V, ensuring isolation during power-down sequences without external blocking circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5Ω typical at VCC = 3.3V, 64mA - enables minimal voltage drop and signal attenuation in high-current digital or analog paths |
| Supply voltage range | 2.3V to 3.6V - compatible with 2.5V and 3.3V logic domains without level translation |
| Propagation delay (tpd) | 0.15–0.25ns at VCC = 2.5V - supports >200MHz bus operation with negligible timing skew |
| Ioff leakage current | 15µA max at VCC = 0V - prevents backdrive damage when upstream/downstream devices remain powered |
| ESD rating (HBM) | 2000V - meets industrial-grade robustness requirements without external protection diodes |
| Operating temperature | −40°C to +85°C - qualified for enterprise server, networking, and industrial control environments |
| Input capacitance (Ci) | 3pF - minimizes loading on driving sources and preserves signal edge integrity |
Pinout & Package
SN74CBTLV3257DBQR uses a 16-pin SSOP (DBQ) package measuring 4.90mm × 3.90mm with standard gull-wing leads and 0.65mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S | Select input | Controls routing: S = L connects A ports to B1; S = H connects A ports to B2 |
| OE | Output-enable (active low) | High disables all switches into high-Z state; requires pullup to VCC for power-up safety |
| 1A–4A | Common I/O ports | Bidirectional channels carrying multiplexed data; tolerate 0–4.6V overvoltage |
| 1B1–4B1, 1B2–4B2 | Switched I/O ports | Each pair (e.g., 1B1/1B2) connects to corresponding A port under S/OE control |
| VCC | Power supply | Single 2.3–3.6V supply powers internal FETs and logic; bypass with 0.1µF capacitor |
| GND | Ground reference | Return path for all signals and supply current; must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| 5Ω low on-resistance | Ensures <50mV drop at 10mA, preserving logic margins and analog signal fidelity across full rail |
| Rail-to-rail I/O switching | Supports 0V to VCC signal swing without clipping - critical for mixed-signal and legacy interface bridging |
| Ioff partial-power-down | Blocks destructive back-current flow when VCC = 0, enabling hot-swap and dynamic power gating |
| JESD 78 Class II latch-up immunity | Withstands >100mA fault current - eliminates need for external current-limiting resistors in harsh environments |
| 2000V HBM ESD protection | Reduces board-level ESD design overhead and improves manufacturing yield in automated assembly |
Applications
| Enterprise Server Backplane Switching | Industrial PLC I/O Multiplexing |
|---|---|
Use Scenario: Routing 4-bit control buses between redundant management controllers and baseboard management units (BMCs) in 1U rack servers. IC Role / Device Role / Timing Role: Bidirectional 2:1 bus selector enabling failover without interrupting PCIe or SMBus traffic. Use Value: 5Ω ron and sub-0.25ns tpd prevent timing violations during hot-swap events; Ioff protects BMCs during partial reboots. | Use Scenario: Sharing a single 4-bit diagnostic interface among multiple sensor modules in modular PLC chassis. IC Role / Device Role / Timing Role: Low-latency analog/digital multiplexer allowing host MCU to sequentially poll sensors without dedicated lines. Use Value: Rail-to-rail operation handles 0–3.3V sensor outputs; 2000V HBM withstands factory ESD exposure during field maintenance. |
| Wired Networking PHY Selection | Building Automation Controller Bus Expansion |
Use Scenario: Selecting between two Ethernet PHYs (e.g., 10/100 vs. 1000BASE-T) connected to a single MAC interface on network switches. IC Role / Device Role / Timing Role: High-speed data path switch isolating unused PHY to reduce power and crosstalk. Use Value: 3pF Ci and 10.5pF Cio(OFF) minimize signal degradation at 125MHz; OE pin enables software-controlled PHY disable. | Use Scenario: Expanding RS-485 or CAN bus access across HVAC, lighting, and security subsystems in smart building gateways. IC Role / Device Role / Timing Role: Level-shifting and direction-agnostic bus multiplexer supporting multi-drop topology. Use Value: Overvoltage tolerance (4.6V) accommodates transient surges on long building wiring; −40°C to 85°C rating ensures outdoor enclosure reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3257PWR | TSSOP-16 package (5.00mm × 4.40mm); identical electrical specs and pinout | Higher thermal resistance (RθJA = 129.1°C/W vs. 116.6°C/W) - less suitable for high-density, thermally constrained layouts | Choose PWR only if board layout already uses TSSOP footprints or requires larger solder joint area for reliability |
| SN74CBTLV3257DGV | TVSOP-16 package (3.60mm × 4.40mm); same ron, timing, and Ioff, but RθJA = 123.1°C/W | Smaller footprint than DBQ but higher thermal impedance - better for space-constrained designs with moderate power dissipation | Select DGV when PCB real estate is critical and ambient temperature stays below 70°C |
Compared with SN74CBTLV3257PWR and SN74CBTLV3257DGV, the SN74CBTLV3257DBQR offers the best thermal performance (RθJA = 116.6°C/W) in a compact SSOP form factor, making it optimal for high-reliability, thermally demanding applications like datacenter interconnects.
Availability
SN74CBTLV3257DBQR is available at Aetrix Electronics and suitable for enterprise server backplanes, industrial PLC I/O expansion, and wired networking PHY selection requiring stable component supply across multi-year production cycles.
Supply support for SN74CBTLV3257DBQR 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 U.S.-based semiconductor company specializing in analog and embedded processing technologies, with leadership in signal integrity, power management, and high-speed interface solutions.
The SN74CBTLV3257 belongs to TI's CBTLV (CrossBar Transistor Logic Very-low voltage) family, designed specifically for low-latency, low-power bus switching in enterprise computing and communications infrastructure.
FAQ
What is the maximum continuous current per channel for the SN74CBTLV3257DBQR?
The SN74CBTLV3257DBQR supports up to 128mA continuous channel current per switch, as specified in Absolute Maximum Ratings. This rating applies across the full operating temperature range and ensures reliable conduction without thermal runaway or parametric shift under sustained load conditions.
Does the SN74CBTLV3257DBQR require external pull-up resistors on the OE pin?
Yes, the SN74CBTLV3257DBQR requires a pull-up resistor on the OE pin to VCC to ensure high-impedance state during power-up and power-down transitions. The minimum resistor value depends on the driver's current-sinking capability, but typical values range from 4.7kΩ to 10kΩ for standard CMOS drivers.
Can the SN74CBTLV3257DBQR operate with input signals exceeding VCC?
Yes, the SN74CBTLV3257DBQR supports overvoltage-tolerant I/O: inputs and outputs can safely swing up to 4.6V regardless of VCC setting (2.3V–3.6V), enabling interoperability with higher-voltage peripherals without level shifters.
What is the function of the S pin on the SN74CBTLV3257DBQR?
The S (Select) pin on the SN74CBTLV3257DBQR determines which B-side port connects to each A-side port: when S is low, 1A–4A connect to 1B1–4B1; when S is high, they connect to 1B2–4B2. This enables synchronous 4-bit 2:1 multiplexing or demultiplexing under single-control logic.
Is the SN74CBTLV3257DBQR pin-compatible with other packages in the same family?
Yes, the SN74CBTLV3257DBQR shares identical pin functions and numbering with SN74CBTLV3257PWR (TSSOP), SN74CBTLV3257DGV (TVSOP), and SN74CBTLV3257RGYR (VQFN), though mechanical dimensions and thermal characteristics differ - PCB layout must match the selected package footprint.
SN74CBTLV3257DBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 4 x 1:2
- Independent Circuits:
- 4
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
SN74CBTLV3257DBQR FAQ
1.How can I place an order for SN74CBTLV3257DBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3257DBQR 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 SN74CBTLV3257DBQR reliable?
The price and inventory of SN74CBTLV3257DBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3257DBQR is usually 5 days.
3.What payment methods are accepted for SN74CBTLV3257DBQR?
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4.How is shipping managed for SN74CBTLV3257DBQR?
SN74CBTLV3257DBQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3257DBQR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74CBTLV3257DBQR?
For technical support, including SN74CBTLV3257DBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3257DBQR requirements.
6.How does Aetrix verify that SN74CBTLV3257DBQR is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3257DBQR 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 SN74CBTLV3257DBQR meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3257DBQR?
All SN74CBTLV3257DBQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3257DBQR, 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 SN74CBTLV3257DBQR part is unused and in its original packaging.
Return procedure for SN74CBTLV3257DBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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