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Texas Instruments 74CBTLV3257PWRG4
- Part No.:
- 74CBTLV3257PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74CBTLV3257PWRG4.pdf
- Description:
- IC MUX/DEMUX 4 X 1:2 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,383
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Product details
Overview
74CBTLV3257PWRG4 from Texas Instruments is a low-voltage 4-bit 1-of-2 FET multiplexer/demultiplexer with 5 Ω on-state resistance, rail-to-rail signal switching, and Ioff partial-power-down support. It operates from 2.3 V to 3.6 V and delivers sub-6 ns propagation delay (tpd) in TSSOP-16 packaging, enabling high-speed bus routing in enterprise computing and wired networking systems.
For engineers reviewing the 74CBTLV3257PWRG4 datasheet, 74CBTLV3257PWRG4 pinout, 74CBTLV3257PWRG4 application, or 74CBTLV3257PWRG4 equivalent, this device serves as a high-bandwidth, low-distortion analog/digital signal switch for 4-channel bidirectional data path selection under ±128 mA per channel load conditions.
Technical Context
The 74CBTLV3257PWRG4 implements four independent single-pole double-throw (SPDT) FET switches controlled by one shared select (S) input and one active-low output-enable (OE) input. Each switch features symmetrical I/O ports (A, B1, B2) supporting true bidirectional signal flow without directionality constraints.
Its Ioff protection ensures <15 µA leakage when VCC = 0 V and any I/O is biased between 0–3.6 V, enabling safe hot-insertion and power sequencing in multi-rail systems. The device maintains isolation during power-off and requires OE tied to VCC via a pullup resistor to guarantee high-impedance state at power-up/down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 3 V, 64 mA - enables minimal voltage drop and signal attenuation across switched paths |
| Propagation delay (tpd) | 0.15–0.25 ns at VCC = 2.5 V - supports >200 MHz signal integrity in high-speed digital buses |
| Supply voltage range | 2.3 V to 3.6 V - compatible with 2.5 V and 3.3 V logic domains without level translation |
| Ioff current | 15 µA max at VCC = 0 V - prevents backflow current and latch-up during partial power-down |
| ESD rating (HBM) | 2000 V - meets industrial-grade robustness requirements for handling and board assembly |
| Operating temperature | –40 °C to +85 °C - qualified for enterprise infrastructure and industrial control environments |
| Channel current limit | ±128 mA per switch - supports driving moderate capacitive loads and terminated transmission lines |
Pinout & Package
TSSOP-16 package (PW), 5.00 mm × 4.40 mm body, 0.65 mm pitch, exposed thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (S) | Select input | Controls routing: S = L connects A to B1; S = H connects A to B2 |
| 2 (1B1), 3 (1B2), 4 (1A) | Channel 1 I/O terminals | 1A = common port; 1B1/1B2 = selectable paths - fully bidirectional |
| 5 (2B1), 6 (2B2), 7 (2A) | Channel 2 I/O terminals | Independent of Channel 1; identical SPDT routing behavior |
| 8 (GND) | Ground reference | Primary return path for all internal circuitry and switch conduction |
| 9 (3A), 10 (3B2), 11 (3B1) | Channel 3 I/O terminals | Third independent 1-of-2 switch; pin order matches functional grouping |
| 12 (4A), 13 (4B2), 14 (4B1) | Channel 4 I/O terminals | Fourth independent switch; supports full 4-bit bus multiplexing |
| 15 (OE) | Output enable (active low) | OE = H disables all switches to high-Z; OE = L enables S-controlled routing |
| 16 (VCC) | Power supply | Single 2.3–3.6 V supply powers logic control and FET channels; decoupling required |
Key Features
| Feature | Design Value |
|---|---|
| 5 Ω ron | Minimizes insertion loss and timing skew across 4 bidirectional data paths |
| Rail-to-rail I/O | Supports full 0–VCC signal swing without clipping or distortion on any port |
| Ioff partial-power-down | Enables safe operation when VCC is unpowered while I/Os remain live (e.g., hot-swap backplanes) |
| Latch-up immunity | Exceeds 100 mA per JESD 78 Class II - eliminates risk of destructive latch-up in noisy environments |
| Low input capacitance | 3 pF typical - reduces loading on driving sources and preserves signal edge rates |
Applications
| Enterprise Server Backplane Switching | Industrial Ethernet PHY Multiplexing |
|---|---|
|
Use Scenario: Selecting between two redundant 4-bit control buses connected to BMC or management controllers in 1U/2U servers. IC Role / Device Role / Timing Role: Bidirectional 1-of-2 switch per bit, enabling failover without software intervention or clock domain crossing. Use Value: Sub-6 ns tpd and 5 Ω ron preserve signal integrity across PCIe-sideband or SMBus links operating up to 100 MHz. |
Use Scenario: Sharing a single MAC interface between two Ethernet PHYs (e.g., 10/100BASE-TX and 1000BASE-T) in programmable logic controllers. IC Role / Device Role / Timing Role: Hardware-selectable signal path for MDIO/MDC and RMII signals, synchronized with S/OE control pins. Use Value: Ioff protection allows PHY hot-swap while MAC remains powered, avoiding system reset or bus lockup. |
| Data Center Optical Module Interface | Building Automation Controller Bus Expansion |
|
Use Scenario: Routing I²C or GPIO configuration lines between host processor and pluggable QSFP+/OSFP modules in top-of-rack switches. IC Role / Device Role / Timing Role: Low-capacitance (3 pF) switch isolating module-specific control lines from mainboard logic during insertion/removal. Use Value: 2000 V HBM ESD rating withstands handling in automated optical module assembly lines without additional protection. |
Use Scenario: Expanding RS-485 or CAN FD node count by dynamically assigning transceivers to shared controller UARTs in HVAC or lighting gateways. IC Role / Device Role / Timing Role: 4-channel analog/digital switch enabling time-multiplexed access to multiple physical layer interfaces. Use Value: ±128 mA channel rating supports driving termination resistors and stubs on long building wiring runs without external buffers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3257PWRE4 | Same silicon, identical electrical specs, NIPDAU finish, Level-1 MSL rating vs Level-1 for PWRG4 | No functional difference; both rated –40°C to +85°C in TSSOP-16 | Select based on tape-and-reel packaging preference (E4 vs G4 suffix) - electrically interchangeable |
| 74LVC1G3157GW,125 | Single-channel 2:1 switch, 6 Ω ron, 1.65–5.5 V supply, SC-70-6 package | Requires four units to match 4-bit functionality; wider VCC range but higher ron and lower current rating (±50 mA) | Use only when space-constrained layouts demand discrete channel implementation or 5 V compatibility is mandatory |
Compared with SN74CBTLV3257PWRE4, the 74CBTLV3257PWRG4 offers identical performance and qualification; compared with 74LVC1G3157GW,125, it provides integrated 4-channel operation, lower on-resistance, higher current drive, and tighter thermal specification - making it optimal for consolidated bus-switching architectures.
Availability
74CBTLV3257PWRG4 is available at Aetrix Electronics and suitable for enterprise server backplanes, industrial Ethernet PHY routing, and building automation controller bus expansion requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for 74CBTLV3257PWRG4 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 leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in high-performance logic and interface solutions.
The SN74CBTLV family was designed specifically for low-voltage, high-speed signal routing in data-intensive infrastructure - emphasizing minimal propagation delay, rail-to-rail switching, and robust partial-power-down behavior for mission-critical systems.
FAQ
What is the maximum operating frequency supported by the 74CBTLV3257PWRG4?
The 74CBTLV3257PWRG4 is characterized for operation up to 200 MHz, validated by its sub-6 ns propagation delay (tpd) and low 3 pF input capacitance. Signal integrity at this frequency depends on PCB layout - controlled impedance traces and minimized stub lengths are recommended to maintain bandwidth. The device does not include internal termination or equalization, so external design practices govern ultimate frequency capability.
Does the 74CBTLV3257PWRG4 support 5 V-tolerant I/O?
Yes, the 74CBTLV3257PWRG4 supports overvoltage tolerance up to 4.6 V on all I/O pins regardless of VCC setting (2.3–3.6 V), as specified in Absolute Maximum Ratings. This allows safe interfacing with 5 V systems when used as a level-shifting switch, provided VCC remains within its rated range and no sustained 5 V bias is applied to VCC itself.
How should the OE pin be connected for reliable power-up behavior in the 74CBTLV3257PWRG4?
To ensure high-impedance state during power-up and power-down, OE must be tied to VCC through an external pullup resistor. The minimum resistor value depends on the current-sinking capability of the driving source - TI recommends verifying that the driver can sink sufficient current to hold OE below VIL (0.7–0.8 V) when actively asserting the pin. Floating OE is not permitted.
Can the 74CBTLV3257PWRG4 be used in hot-swap applications?
Yes, the 74CBTLV3257PWRG4 is explicitly designed for hot-swap use via its Ioff feature: when VCC = 0 V, leakage current remains ≤15 µA even if I/O pins are biased from external powered circuits. This prevents damaging back-current flow and ensures isolation - a key requirement for backplane and modular system designs where cards may be inserted or removed under power.
What is the thermal performance of the 74CBTLV3257PWRG4 in TSSOP-16 package?
In the PW (TSSOP-16) package, the 74CBTLV3257PWRG4 has a junction-to-ambient thermal resistance (RθJA) of 129.1 °C/W. With typical power dissipation below 1 mW under static conditions and <10 mW under full switching, self-heating remains negligible in standard FR-4 layouts with 2 oz copper and minimal copper pour. No heatsink or thermal vias are required for operation within –40°C to +85°C ambient.
74CBTLV3257PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-TSSOP
74CBTLV3257PWRG4 FAQ
1.How can I place an order for 74CBTLV3257PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CBTLV3257PWRG4 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 74CBTLV3257PWRG4 reliable?
The price and inventory of 74CBTLV3257PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CBTLV3257PWRG4 is usually 5 days.
3.What payment methods are accepted for 74CBTLV3257PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74CBTLV3257PWRG4 transactions.
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4.How is shipping managed for 74CBTLV3257PWRG4?
74CBTLV3257PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CBTLV3257PWRG4 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 74CBTLV3257PWRG4?
For technical support, including 74CBTLV3257PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CBTLV3257PWRG4 requirements.
6.How does Aetrix verify that 74CBTLV3257PWRG4 is sourced from the original manufacturer or authorized distributors?
All 74CBTLV3257PWRG4 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 74CBTLV3257PWRG4 meets industry standards.
7.What is the process for return or replacement of 74CBTLV3257PWRG4?
All 74CBTLV3257PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74CBTLV3257PWRG4, 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 74CBTLV3257PWRG4 part is unused and in its original packaging.
Return procedure for 74CBTLV3257PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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