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Texas Instruments SN74CBT1G125DBVR
- Part No.:
- SN74CBT1G125DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SN74CBT1G125DBVR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,042
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Product details
Overview
SN74CBT1G125DBVR from Texas Instruments is a single-channel FET bus switch used for high-speed digital signal routing in 3.3-V and 5-V systems. It features 5-Ω on-state resistance, TTL-compatible control input levels, and operates from –40°C to 85°C with supply voltage up to 5.5 V. It serves as an enable-controlled bidirectional signal path in data bus isolation applications.
For engineers reviewing the SN74CBT1G125DBVR datasheet, SN74CBT1G125DBVR pinout, SN74CBT1G125DBVR application, or SN74CBT1G125DBVR equivalent, key selection criteria include on-resistance matching, propagation delay under 0.35 ns at 4 V, latch-up immunity >250 mA, ESD robustness (2000-V HBM), and SOT-23 (DBV) package compatibility with space-constrained PCB layouts.
Technical Context
This device implements a single NMOS pass-gate switch controlled by an active-low OE input. When OE is low, the A–B path conducts bidirectionally with minimal RC delay; when OE is high, the switch isolates ports with <4 pF off-capacitance. The design uses no internal level-shifting circuitry - VIH/VIL thresholds are fixed at 2 V/0.8 V, ensuring direct TTL logic interfacing without external biasing.
It complies with JESD 17 latch-up testing and JESD 22 ESD standards, supports continuous channel current up to 128 mA, and maintains stable on-resistance across VCC = 4 V to 5.5 V. Thermal performance is characterized by θJA = 206°C/W in the DBV package, enabling operation in industrial ambient conditions without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω at VCC = 4.5 V, defining low insertion loss and minimal voltage drop for 30-mA signals |
| Propagation delay (tpd) | 0.25 ns at VCC = 5 V, CL = 50 pF - enables sub-nanosecond signal routing in high-speed buses |
| Off-capacitance (Cio(OFF)) | 4 pF at VO = 3 V, minimizing crosstalk and capacitive loading when disabled |
| Supply voltage range | 4 V to 5.5 V - compatible with both 3.3-V and 5-V logic domains without level translation |
| Operating temperature | –40°C to 85°C - qualified for industrial-grade embedded and communications equipment |
| ESD rating (HBM) | 2000 V - exceeds JEDEC JESD22-A114A, reducing field failure risk in handling and assembly |
| Latch-up immunity | >250 mA per JESD17 - prevents destructive latch-up during transient overvoltage events |
Pinout & Package
SOT-23 (DBV) package: 5-pin, 1.45-mm maximum height, 2.9-mm × 1.6-mm footprint, gull-wing leads, RoHS-compliant NiPdAu/Sn lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output-enable control input | Active-low logic signal; drives switch ON when low, OFF when high - TTL-compatible threshold (VIH = 2 V, VIL = 0.8 V) |
| 2 (A) | Input/output port A | Bidirectional signal terminal; connects directly to source or sink logic without direction control |
| 3 (GND) | Ground reference | Return path for internal FET substrate and control logic - must be low-impedance for noise immunity |
| 4 (VCC) | Power supply | Supplies gate drive and internal logic; decoupling capacitor required within 1 cm of pin for stable switching |
| 5 (B) | Input/output port B | Bidirectional signal terminal; electrically identical to A - forms symmetrical pass-through path with A |
Key Features
| Feature | Design Value |
|---|---|
| Low on-resistance | 5–7 Ω ensures <0.2 V drop at 30 mA, preserving logic high/low margins in 3.3-V and 5-V buses |
| TTL-compatible control | OE input accepts standard TTL voltage thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), eliminating need for external level shifters |
| Ultra-fast switching | 0.25 ns tpd at 5 V enables use in >1-GHz data paths where timing skew must be minimized |
| Low off-capacitance | 4 pF Cio(OFF) reduces capacitive coupling between isolated bus segments, critical for signal integrity in dense layouts |
| Robust ESD/latch-up | 2000-V HBM and >250 mA latch-up immunity allow safe deployment in unshielded industrial environments |
Applications
| PCI Express Gen1 Signal Isolation | USB 2.0 Data Line Switching |
|---|---|
Use Scenario: Isolating PCIe reference clock or sideband signals during hot-plug detection to prevent backdrive into powered-down slots. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling/disabling clock or SMBus lines without signal inversion or delay accumulation. Use Value: 0.25 ns propagation delay and 4 pF off-capacitance maintain PCIe Gen1 timing budgets and reduce jitter-induced bit errors. | Use Scenario: Dynamically routing USB D+ and D− lines between host controller and multiple peripheral ports in multi-function docking stations. IC Role / Device Role / Timing Role: Single-pole single-throw (SPST) analog switch providing low-distortion, bidirectional 480-Mbps data path control. Use Value: 5–7 Ω on-resistance preserves USB 2.0 eye diagram integrity; TTL-compatible OE simplifies FPGA GPIO interface. |
| Memory Address Bus Multiplexing | FPGA I/O Expansion Interface |
Use Scenario: Sharing address lines between two memory banks (e.g., SRAM and Flash) using time-division multiplexing in microcontroller-based systems. IC Role / Device Role / Timing Role: High-speed bus switch enabling clean break-before-make switching to avoid bus contention during bank transitions. Use Value: Sub-1 ns enable/disable times (ten = 1.6 ns, tdis = 1.0 ns at 5 V) minimize address glitch windows and ensure deterministic access timing. | Use Scenario: Expanding limited FPGA I/O pins to drive multiple sensor interfaces (I²C, SPI, UART) via shared bus segments. IC Role / Device Role / Timing Role: Logic-level-transparent signal router allowing FPGA to selectively connect to one sensor subsystem at a time. Use Value: 206°C/W thermal resistance and industrial temp range support continuous operation in fanless edge-node enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G3157DBVR | CMOS analog switch; higher on-resistance (6–10 Ω), lower VCC range (1.65–5.5 V), 5.5 ns max tpd | Supports 1.8-V logic; less suitable for sub-ns timing-critical paths but better for mixed-voltage I/O expansion | Select when 1.8-V compatibility or lower static current (<0.1 µA) is prioritized over speed |
| NC7SZ125P5X | Single buffer with 3-state output; not bidirectional; 3.5 ns tpd; 32 mA drive strength; no analog pass-gate behavior | Used for unidirectional signal buffering with output enable - cannot replace bidirectional bus isolation | Select only for non-bidirectional, logic-level-repeating functions where isolation is not required |
Compared with SN74CBT1G125DBVR, SN74LVC1G3157DBVR trades speed for broader voltage flexibility, while NC7SZ125P5X provides digital buffering instead of analog switching - neither offers pin-compatible bidirectional low-Ron performance.
Availability
SN74CBT1G125DBVR is available at Aetrix Electronics and suitable for industrial automation controllers, USB peripheral hubs, PCIe add-in card designs, and FPGA-based test equipment requiring stable component supply and long-term manufacturability.
Supply support for SN74CBT1G125DBVR 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 decades of experience in high-reliability logic and interface solutions.
The SN74CBT family delivers high-speed, low-distortion bus switches optimized for signal integrity in 3.3-V and 5-V digital systems - designed specifically for applications demanding nanosecond timing, low on-resistance, and robust ESD tolerance.
FAQ
What is the maximum continuous current rating for SN74CBT1G125DBVR?
The SN74CBT1G125DBVR supports a continuous channel current of 128 mA, verified per absolute maximum ratings. This value defines the upper limit for sustained DC conduction through the A–B path without thermal degradation. Exceeding this current may trigger thermal shutdown or permanent damage. For pulsed operation, peak current must still respect the 128-mA average limit over thermal time constants.
Does SN74CBT1G125DBVR support bidirectional signal flow?
Yes, SN74CBT1G125DBVR is inherently bidirectional: signals pass equally well from A to B or B to A when OE is low. Its NMOS pass-gate architecture has no intrinsic directionality, and electrical characteristics (ron, Cio, tpd) are symmetric across terminals. No external biasing or direction control is needed - making it ideal for shared bus architectures like I²C or memory address lines.
Can SN74CBT1G125DBVR operate at 3.3 V supply?
Yes, SN74CBT1G125DBVR operates within a recommended VCC range of 4 V to 5.5 V, so 3.3 V is below specification. While some units may function at 3.3 V, parameters like on-resistance (increasing to ~10 Ω) and propagation delay (degrading beyond 0.5 ns) are not guaranteed. For true 3.3-V operation, TI recommends SN74LVC1G3157DBVR instead.
What is the thermal resistance (θJA) of SN74CBT1G125DBVR in its SOT-23 package?
The SN74CBT1G125DBVR in the DBV package has a specified junction-to-ambient thermal resistance (θJA) of 206°C/W under standard JEDEC test conditions. This value assumes a 2-layer PCB with 1-in² copper pour under the package. Actual board-level θJA will vary based on layout - adding thermal vias and ground planes can reduce effective θJA by 30–50%.
Is SN74CBT1G125DBVR pin-compatible with other members of the SN74CBT1Gxx series?
No - SN74CBT1G125DBVR is not pin-compatible with other SN74CBT1Gxx variants such as SN74CBT1G32 or SN74CBT1G08. Although all share the same SOT-23 (DBV) 5-pin footprint, their pin functions differ: SN74CBT1G125DBVR assigns Pin 1 to OE, Pins 2/5 to A/B, Pin 3 to GND, and Pin 4 to VCC, whereas logic gates assign Pin 1 to input and Pin 5 to output. Always verify pin mapping per datasheet before substitution.
SN74CBT1G125DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 1 x 1:1
- 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:
- SOT-23-5
SN74CBT1G125DBVR FAQ
1.How can I place an order for SN74CBT1G125DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT1G125DBVR 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 SN74CBT1G125DBVR reliable?
The price and inventory of SN74CBT1G125DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT1G125DBVR is usually 5 days.
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Once your SN74CBT1G125DBVR 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 SN74CBT1G125DBVR?
For technical support, including SN74CBT1G125DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT1G125DBVR requirements.
6.How does Aetrix verify that SN74CBT1G125DBVR is sourced from the original manufacturer or authorized distributors?
All SN74CBT1G125DBVR 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 SN74CBT1G125DBVR meets industry standards.
7.What is the process for return or replacement of SN74CBT1G125DBVR?
All SN74CBT1G125DBVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT1G125DBVR, 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 SN74CBT1G125DBVR part is unused and in its original packaging.
Return procedure for SN74CBT1G125DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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