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Texas Instruments SN74CBT3125PWRG4
- Part No.:
- SN74CBT3125PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3125PWRG4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,333
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Product details
Overview
SN74CBT3125PWRG4 from Texas Instruments is a quadruple FET bus switch IC with independent 5-Ω analog switches, TTL-compatible control inputs, and 4.0–5.5 V supply operation. It enables bidirectional signal routing in data buses, memory expansion interfaces, and level-shifting applications where low on-resistance and fast switching are critical.
For engineers reviewing the SN74CBT3125PWRG4 datasheet, SN74CBT3125PWRG4 pinout, SN74CBT3125PWRG4 application, or SN74CBT3125PWRG4 equivalent, key selection criteria include on-state resistance (5–7 Ω), propagation delay (0.25–0.35 ns), enable/disable timing (1.6–6 ns), thermal performance (θJA = 113°C/W), and TSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
This device implements four independent NMOS transmission gate switches, each controlled by a dedicated output-enable (OE) input operating at TTL logic thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V). Switch conduction occurs only when OE is low, placing the A–B path in low-impedance mode; high OE forces high-impedance isolation.
The architecture supports bidirectional analog/digital signal pass-through with minimal distortion: typical on-resistance is 5 Ω at VCC = 4.5 V and II = 30 mA, while off-capacitance remains low at 4 pF, preserving signal integrity for high-speed buses up to 100 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.0–5.5 V - Ensures compatibility with 5-V TTL and mixed-voltage systems without level shifters. |
| On-State Resistance (ron) | 5–7 Ω - Enables low-loss signal coupling in data paths; supports ≥128 mA continuous channel current. |
| Propagation Delay (tpd) | 0.25–0.35 ns - Delivers sub-nanosecond switching for high-speed bus gating in memory and peripheral interfaces. |
| Enable/Disable Time (ten/tdis) | 1.6–6 ns - Provides precise timing control for dynamic bus arbitration and hot-swap isolation. |
| Input Capacitance (Ci) | 3 pF - Minimizes loading on upstream drivers, preserving rise/fall times in fan-out-critical designs. |
| Off-State Capacitance (Cio(OFF)) | 4 pF - Reduces crosstalk and signal leakage between isolated channels in multi-bus systems. |
| Thermal Resistance (θJA) | 113°C/W - Matches TSSOP-14 thermal profile for reliable operation in industrial ambient (−40°C to 85°C). |
Pinout & Package
TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 10 (1OE, 2OE, 3OE, 4OE) | Output Enable Control | Active-low TTL-compatible inputs; tie high via pullup to ensure power-up high-Z state. |
| 2, 5, 12, 14 (1A, 2A, 3A, 4A) | Port A Terminal | Bidirectional signal input/output node for first side of each switch pair. |
| 3, 6, 11, 13 (1B, 2B, 3B, 4B) | Port B Terminal | Bidirectional signal input/output node for second side of each switch pair. |
| 8 (GND) | Ground Reference | Primary return path for switch current and logic reference; decouple locally with 0.1 µF ceramic. |
| 14 (VCC) | Power Supply | Single 4–5.5 V rail powering all four switches and control circuitry; bypass with 0.1 µF near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Independent Quad Switches | Four isolated 5-Ω FET paths allow selective routing of separate data lines without mutual interference. |
| TTL-Compatible Control | VIL ≤ 0.8 V / VIH ≥ 2 V thresholds eliminate need for external level translation when driven by legacy 5-V logic. |
| Low Off-Capacitance | 4 pF Cio(OFF) minimizes capacitive loading on adjacent traces, reducing crosstalk in dense PCB routing. |
| Fast Enable/Disable Timing | 1.6 ns ten and 4.7 ns tdis support real-time bus reconfiguration in FPGA I/O expansion and test equipment. |
| High Current Capability | 128 mA continuous channel rating enables robust signal switching in memory address/data buffers and peripheral multiplexing. |
Applications
| Memory Expansion Interface | FPGA I/O Multiplexing |
|---|---|
Use Scenario: Expanding address/data bus width between microcontroller and external SRAM/Flash using shared pins. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating memory segments during access arbitration; enables time-multiplexed sharing of limited MCU pins. Use Value: Eliminates need for discrete logic gates or complex CPLD-based bus controllers while maintaining <0.35 ns signal delay. | Use Scenario: Routing configuration signals or debug interfaces between FPGA banks and external test headers or PMODs. IC Role / Device Role / Timing Role: Selectively enabling/disabling JTAG, SPI, or UART paths based on FPGA configuration state or runtime mode. Use Value: Prevents signal contention during partial reconfiguration; 5 Ω ron ensures minimal voltage drop across switched lines. |
| Hot-Swappable Peripheral Hub | Legacy System Bus Isolation |
Use Scenario: Adding/removing USB-to-serial bridges or sensor modules without powering down main controller. IC Role / Device Role / Timing Role: High-impedance isolation of peripheral data lines during insertion/removal; OE controlled by microcontroller GPIO. Use Value: Prevents back-driving of powered logic; 4 pF Cio(OFF) avoids signal corruption on live bus segments. | Use Scenario: Interfacing modern 3.3-V peripherals with legacy 5-V ISA or PCI bus controllers. IC Role / Device Role / Timing Role: Level-tolerant bidirectional signal bridge with no direction pin required; operates across full 4–5.5 V range. Use Value: Supports mixed-voltage interoperability without active translators; 128 mA rating handles peak bus currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384PWR | 10-channel, 3.3-V only, higher ron (7–10 Ω), includes 5-V tolerant inputs. | Designed for 3.3-V systems requiring wider bus width and voltage translation. | Select when interfacing 5-V logic to 3.3-V ASICs/FPGAs; not drop-in due to different pin count and supply range. |
| 74LVC1G3157DP,125 | Single-pole double-throw (SPDT), 1.65–5.5 V, ron = 6 Ω, smaller XSON-6 package. | Optimized for space-constrained single-line switching, not quad-channel bus routing. | Choose for point-to-point signal routing where density matters more than channel count; requires four units to match SN74CBT3125PWRG4 functionality. |
Compared with SN74CBT3125PWRG4, SN74CBTD3384PWR offers greater channel count but narrower voltage range and higher on-resistance, while 74LVC1G3157DP,125 provides superior package density at the cost of per-device channel count and added component count for quad functionality.
Availability
SN74CBT3125PWRG4 is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA I/O multiplexing, and hot-swappable peripheral hubs requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74CBT3125PWRG4 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74CBT3125PWRG4 belongs to TI's CBT (CrossBar Technology) family of high-speed CMOS bus switches, engineered for low-latency, bidirectional signal routing in legacy and mixed-voltage digital systems.
FAQ
What is the maximum continuous current rating per channel for SN74CBT3125PWRG4?
The SN74CBT3125PWRG4 supports a continuous channel current of 128 mA per switch. This rating applies under recommended operating conditions (VCC = 4–5.5 V, TA = −40°C to 85°C) and is validated by TI's absolute maximum ratings. Exceeding this current may cause thermal stress or parametric shift; design margin should be maintained for reliability in sustained operation.
Does SN74CBT3125PWRG4 require external pull-up resistors on its OE pins?
Yes - to ensure high-impedance state during power-up or power-down, each OE pin of SN74CBT3125PWRG4 must be tied to VCC through an external pull-up resistor. The minimum value depends on the current-sinking capability of the driving source; TI recommends verifying against the specific control driver's IOL specification to avoid unintended switch activation.
Can SN74CBT3125PWRG4 operate reliably at 3.3 V supply?
No - SN74CBT3125PWRG4 is specified only for 4.0–5.5 V operation per its recommended operating conditions. At 3.3 V, the device may fail to meet guaranteed ron, timing, or logic threshold specifications. For 3.3-V systems, consider TI's SN74CBTD3384 or NXP's 74LVC1G3157 as functionally aligned alternatives.
What is the thermal resistance (θJA) of SN74CBT3125PWRG4 in its TSSOP-14 package?
The junction-to-ambient thermal resistance (θJA) of SN74CBT3125PWRG4 in the PW (TSSOP-14) package is 113°C/W, measured per JEDEC JESD51-7 standards. This value assumes standard 2-layer PCB layout with 1 in² copper pour; actual thermal performance improves with enhanced copper area, thermal vias, or heatsinking.
Is SN74CBT3125PWRG4 pin-compatible with other '125-type bus switches in SOIC or SSOP packages?
Yes - SN74CBT3125PWRG4 follows the industry-standard '125-type pinout used across D (SOIC), DB (SSOP), DGV (TVSOP), and PW (TSSOP) packages. Pin functions (1OE–4OE, 1A–4A, 1B–4B, GND, VCC) are identical; mechanical differences (package size, pitch, height) require PCB footprint validation, but no logic or routing changes are needed for migration.
SN74CBT3125PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 1 x 1:1
- Independent Circuits:
- 4
- 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:
- 14-TSSOP
SN74CBT3125PWRG4 FAQ
1.How can I place an order for SN74CBT3125PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3125PWRG4 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 SN74CBT3125PWRG4 reliable?
The price and inventory of SN74CBT3125PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3125PWRG4 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3125PWRG4 transactions.
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SN74CBT3125PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3125PWRG4 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 SN74CBT3125PWRG4?
For technical support, including SN74CBT3125PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3125PWRG4 requirements.
6.How does Aetrix verify that SN74CBT3125PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3125PWRG4 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 SN74CBT3125PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3125PWRG4?
All SN74CBT3125PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3125PWRG4, 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 SN74CBT3125PWRG4 part is unused and in its original packaging.
Return procedure for SN74CBT3125PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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