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Texas Instruments SN74CBT3125PWRE4
- Part No.:
- SN74CBT3125PWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3125PWRE4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,869
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Product details
Overview
SN74CBT3125PWRE4 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 address lines, and peripheral interconnects where low on-resistance and fast switching are critical.
For engineers reviewing the SN74CBT3125PWRE4 datasheet, SN74CBT3125PWRE4 pinout, SN74CBT3125PWRE4 application, or SN74CBT3125PWRE4 equivalent, key selection criteria include on-state resistance (5–7 Ω), propagation delay (≤0.35 ns at VCC = 4 V), enable/disable timing (ten ≤ 6 ns, tdis ≤ 5.1 ns), thermal performance in TSSOP-14 (θJA = 113°C/W), and compatibility with 3.3 V/5 V mixed-signal systems.
Technical Context
This device implements four independent single-pole single-throw (SPST) analog switches using NMOS FETs, each controlled by a dedicated output-enable (OE) input. Switch conduction occurs only when OE is logic low (≤0.8 V), establishing a low-impedance path between A and B ports.
Each switch supports bidirectional signal flow with no polarity restriction, operates over −40°C to +85°C, and maintains high-impedance isolation when disabled-critical for hot-swap and power sequencing in backplane and modular system designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.0–5.5 V - Ensures reliable operation across 5 V legacy and 4.5 V minimum industrial rails. |
| On-State Resistance (ron) | 5–7 Ω (typ. at VCC = 4.5 V, II = 30 mA) - Minimizes voltage drop and signal distortion in high-speed digital and analog signal paths. |
| Propagation Delay (tpd) | ≤0.35 ns (VCC = 4 V, CL = 50 pF) - Enables sub-nanosecond signal routing for DDR address/control buses and test equipment interfaces. |
| Enable Time (ten) | ≤6 ns (VCC = 4 V) - Supports rapid bus arbitration and dynamic reconfiguration in FPGA I/O expansion and multiplexed sensor hubs. |
| Disable Time (tdis) | ≤5.1 ns (VCC = 4 V) - Guarantees fast isolation to prevent bus contention during state transitions in multi-master systems. |
| Input Clamp Current (IK) | −50 mA - Protects against transient overvoltage events without external TVS diodes in industrial I/O modules. |
| Thermal Impedance (θJA) | 113°C/W (TSSOP-14 package) - Defines maximum power dissipation margin (≈44 mW at ΔT = 5°C) for continuous operation in compact PCB layouts. |
Pinout & Package
TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, lead-free NiPdAu finish, MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 (1OE, 2OE, 3OE, 4OE) | Output Enable Input | Active-low control per switch; tie to VCC via pull-up resistor for power-up high-impedance safety. |
| 2, 5, 11, 14 (1A, 2A, 3A, 4A) | Port A Terminal | Bidirectional signal node connected to source side of FET; compatible with 3.3 V/5 V logic levels. |
| 3, 6, 12, 9 (1B, 2B, 3B, 4B) | Port B Terminal | Bidirectional signal node connected to drain side of FET; electrically identical to Port A. |
| 7 | GND | Power return reference for all switches and control circuitry; requires low-inductance connection to minimize ground bounce. |
| 14 | VCC | Positive supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω Analog Switch Path | Enables minimal insertion loss (<0.5% voltage drop at 10 mA) for clean signal integrity in clock distribution and data strobe routing. |
| TTL-Compatible Control Inputs | Accepts standard 0.8 V/2.0 V thresholds without level shifters-reduces BOM count in mixed-voltage microcontroller interfaces. |
| Independent Per-Switch Enable | Allows selective bus segmentation (e.g., isolate one memory bank while others remain active) without global reset or software overhead. |
| High-Impedance Isolation When Disabled | Leakage <±1 μA ensures no DC loading on downstream circuits during standby-critical for battery-powered sensor nodes. |
| −0.5 V to 7 V Input/Output Range | Supports fault-tolerant operation beyond supply rails, enabling safe interfacing with ±5 V analog front-ends or legacy 5 V peripherals. |
Applications
| PCI Express Lane Multiplexing | Memory Address Bus Switching |
|---|---|
Use Scenario: Dynamically rerouting PCIe Gen2 lanes between two host processors and a shared NVMe SSD in embedded server modules. IC Role / Device Role / Timing Role: Bidirectional lane selector providing sub-ns signal path continuity and zero-latency enable/disable control. Use Value: Eliminates need for discrete mux ICs with higher Ron and longer propagation delays, preserving PCIe eye diagram margins. | Use Scenario: Sharing a single SRAM chip between dual-CPU subsystems in real-time industrial controllers. IC Role / Device Role / Timing Role: Isolating address/data lines during CPU context switches to prevent bus contention and data corruption. Use Value: Enables deterministic <6 ns enable timing and <5.1 ns disable timing-meeting tight 10 ns setup/hold windows of 100 MHz SRAM interfaces. |
| FPGA I/O Expansion Hub | Industrial Sensor Data Aggregation |
Use Scenario: Expanding limited FPGA GPIOs to drive eight analog sensors via time-multiplexed ADC sampling. IC Role / Device Role / Timing Role: Low-Ron analog switch matrix routing sensor outputs to a single ADC input channel. Use Value: 5–7 Ω Ron introduces <0.1% gain error at 10 kΩ source impedance-within 12-bit ADC accuracy requirements. | Use Scenario: Consolidating 4× 4–20 mA current-loop sensor signals into a single isolated RS-485 transceiver interface. IC Role / Device Role / Timing Role: High-impedance isolation switch preventing cross-talk between active and inactive sensor channels. Use Value: ±1 μA leakage ensures <1 µA total channel crosstalk-well below 4 mA minimum loop current, maintaining SIL-2 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384DBR | 10-channel, 3.3 V–5 V operation, lower Ron (3.5 Ω typ.), but requires VCC ≥ 4.5 V for full spec compliance. | Higher channel count suits dense I/O expansion; not suitable for 4 V min-rail systems. | Select when higher density and lower Ron outweigh supply voltage flexibility. |
| 74LVC1G3157GW | Single-channel, 1.65–5.5 V operation, Ron = 8 Ω (typ. at 3.3 V), smaller SC-70-6 package. | Used for point-to-point signal gating rather than quad-bus routing; lacks independent OE per channel. | Select for space-constrained single-line isolation where quad integration is unnecessary. |
Compared with SN74CBT3125PWRE4, SN74CBTD3384DBR offers higher integration and lower Ron but sacrifices 4 V minimum supply support, while 74LVC1G3157GW provides ultra-small footprint and wider voltage range at the cost of channel count and per-switch control granularity.
Availability
SN74CBT3125PWRE4 is available at Aetrix Electronics and suitable for industrial automation controllers, test and measurement instrumentation, and embedded computing platforms requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for SN74CBT3125PWRE4 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-reliability interface solutions.
The SN74CBT3125PWRE4 belongs to TI's CBT (Crossbar Bus Technology) family, designed specifically for low-latency, low-distortion signal routing in high-speed digital systems where traditional logic-based muxes introduce unacceptable timing skew or loading.
FAQ
What is the maximum continuous current rating per channel of the SN74CBT3125PWRE4?
The SN74CBT3125PWRE4 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 assumes proper PCB thermal design-particularly for the TSSOP-14 package with θJA = 113°C/W. Exceeding this current may cause thermal runaway or parametric shift in on-resistance.
Does the SN74CBT3125PWRE4 require external pull-up resistors on its OE pins?
Yes-the SN74CBT3125PWRE4 OE inputs must be tied to VCC through an external pull-up resistor during power-up/down to ensure high-impedance state. The minimum resistor value depends on the driver's current-sinking capability; TI recommends verifying against the specific controller's IOL spec. Leaving OE floating risks undefined switch states and potential bus contention.
Can the SN74CBT3125PWRE4 operate with a 3.3 V supply?
No-the SN74CBT3125PWRE4 has a minimum recommended VCC of 4.0 V per the datasheet's "Recommended Operating Conditions." At 3.3 V, on-resistance increases significantly (>15 Ω), propagation delay degrades, and VIH/VIL thresholds fall outside specification-making it unsuitable for reliable 3.3 V-only systems. Use 74LVC-series alternatives for true 3.3 V operation.
Is the SN74CBT3125PWRE4 pin-compatible with other packages in the same family?
Yes-the SN74CBT3125PWRE4 (TSSOP-14) shares the standard '125-type pinout with SOIC (D), SSOP (DB), TVSOP (DGV), and QFN (RGY) variants. Pin functions (1OE–4OE, 1A–4A, 1B–4B, GND, VCC) and numbering are identical across these packages, enabling direct PCB footprint substitution where thermal and layout constraints permit.
What is the typical on-state capacitance (Cio(OFF)) of the SN74CBT3125PWRE4 when disabled?
The typical off-state capacitance (Cio(OFF)) of the SN74CBT3125PWRE4 is 4 pF per switch, measured with VO = 3 V or 0 V and OE = VCC. This low value minimizes capacitive loading on adjacent signal lines during isolation-critical for maintaining signal integrity in high-frequency bus architectures like PCI-X and parallel flash interfaces.
SN74CBT3125PWRE4 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
SN74CBT3125PWRE4 FAQ
1.How can I place an order for SN74CBT3125PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3125PWRE4 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 SN74CBT3125PWRE4 reliable?
The price and inventory of SN74CBT3125PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3125PWRE4 is usually 5 days.
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SN74CBT3125PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3125PWRE4 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 SN74CBT3125PWRE4?
For technical support, including SN74CBT3125PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3125PWRE4 requirements.
6.How does Aetrix verify that SN74CBT3125PWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3125PWRE4 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 SN74CBT3125PWRE4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3125PWRE4?
All SN74CBT3125PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3125PWRE4, 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 SN74CBT3125PWRE4 part is unused and in its original packaging.
Return procedure for SN74CBT3125PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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