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Texas Instruments SN74CBT1G125DBVT
- Part No.:
- SN74CBT1G125DBVT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SN74CBT1G125DBVT.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,347
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Product details
Overview
SN74CBT1G125DBVT from Texas Instruments is a single-channel FET bus switch used for high-speed digital signal routing in 3.3-V and 5-V logic systems. It features 5-Ω on-state resistance, TTL-compatible control input levels, and operates across –40°C to 85°C. The device isolates or connects two ports under OE control and supports hot-swap applications with latch-up immunity exceeding 250 mA per JESD 17.
For engineers reviewing the SN74CBT1G125DBVT datasheet, SN74CBT1G125DBVT pinout, SN74CBT1G125DBVT application, or SN74CBT1G125DBVT equivalent, key selection criteria include on-resistance matching, propagation delay under 0.35 ns at 4 V, ESD robustness (2000-V HBM), thermal impedance (206°C/W), and SOT-23 (DBV) package compatibility with space-constrained PCB layouts.
Technical Context
This device implements a single-pole single-throw (SPST) NMOS transmission gate architecture with no internal level-shifting circuitry. Its control logic is active-low: OE = low enables A↔B conduction; OE = high disconnects both ports. The switch exhibits bidirectional signal flow and supports rail-to-rail analog/digital signals up to VCC = 5.5 V.
Electrical behavior is defined by voltage-dependent on-resistance (5–7 Ω at 30 mA, 10–15 Ω at 15 mA), low input capacitance (3 pF), and minimal off-state leakage (<±1 µA). Switching performance is load-capacitance dependent, with typical propagation delay of 0.25 ns at 5 V and CL = 50 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω at VCC = 4.5 V, II = 30 mA - ensures minimal voltage drop and signal integrity for 128-mA max channel current |
| Propagation delay (tpd) | 0.25 ns at VCC = 5 V, CL = 50 pF - enables sub-nanosecond timing in high-speed data paths |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 3.3-V and 5-V logic rails without external regulation |
| Input capacitance (Ci) | 3 pF - reduces capacitive loading on driving logic and preserves edge rate |
| ESD protection | 2000-V HBM, 200-V MM - meets industrial-grade robustness requirements without external protection |
| Latch-up immunity | >250 mA per JESD 17 - prevents destructive latch-up during transient overcurrent events |
| Operating temperature | –40°C to 85°C - qualified for extended industrial ambient conditions |
Pinout & Package
SOT-23 (DBV) 5-pin surface-mount package, 1.45 mm maximum height, 2.9 mm × 1.6 mm footprint, JEDEC MO-178 compliant. Thermal impedance θJA = 206°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output-enable control input | Active-low logic signal; drives internal gate bias to enable/disable A–B conduction path |
| 2 (A) | Input/Output port A | Bidirectional signal terminal; connects to source or sink side of bus segment |
| 3 (GND) | Ground reference | Return path for internal FET substrate and control logic; must be low-impedance |
| 4 (VCC) | Power supply | Provides bias for internal FET channel and control circuitry; decoupling required |
| 5 (B) | Input/Output port B | Bidirectional signal terminal; electrically identical to Pin 2, forms switched path with A |
Key Features
| Feature | Design Value |
|---|---|
| Low on-resistance | 5–7 Ω ensures <350 mV drop at 50 mA, preserving logic high/low margins in 3.3-V systems |
| TTL-compatible OE input | VIH = 2 V / VIL = 0.8 V allows direct interface with legacy 5-V TTL drivers without level shifters |
| Bidirectional signal routing | No direction pin required - A and B terminals are functionally symmetric for flexible PCB layout |
| Hot-swap capable | Zero power-up/down glitches and no Ioff specification - safe for live insertion into powered backplanes |
| Small-footprint packaging | SOT-23 (DBV) saves >60% board area vs. SOIC-8 while maintaining full electrical performance |
Applications
| PCI Express Signal Isolation | Memory Bus Multiplexing |
|---|---|
Use Scenario: Isolating PCIe reference clock or sideband signals during hot-plug events in server backplanes. IC Role / Device Role / Timing Role: Single-pole switch controlling clock/data path continuity between controller and add-in card. Use Value: Prevents signal reflections and ground bounce during insertion/removal while maintaining sub-ns timing integrity. | Use Scenario: Sharing a single DDR memory data bus between two controllers in embedded test equipment. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-division multiplexing of DQ lines without bus contention. Use Value: Eliminates need for dual-port RAM or complex arbitration logic; supports 500+ MHz data rates with <0.35 ns tpd. |
| USB 2.0 Data Line Switching | FPGA I/O Expansion Hub |
Use Scenario: Routing USB D+/D− signals between host microcontroller and multiple peripheral connectors. IC Role / Device Role / Timing Role: Low-capacitance analog switch preserving differential signal integrity and eye diagram compliance. Use Value: 3 pF Ci and 5–7 Ω ron maintain USB 2.0 full-speed (12 Mbps) eye opening without equalization. | Use Scenario: Expanding FPGA GPIO count by switching shared control lines (e.g., SPI CS, I²C ADDR) to multiple slave devices. IC Role / Device Role / Timing Role: Logic-level translator and isolation element for multi-drop control buses operating at ≤10 MHz. Use Value: Enables one FPGA pin to drive up to four peripherals via OE-controlled time-slicing, reducing pin count pressure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G3157DBVR | Lower VCC range (1.65–5.5 V); higher ron (6–10 Ω); includes break-before-make logic | Preferred for mixed-voltage systems (1.8 V/3.3 V) but adds 1.5 ns disable delay | Select when level translation or guaranteed isolation during transition is required |
| NC7SZ125P5X | 3-pin SC-70 package; no OE pin - always-enabled buffer; higher ICC (10 µA) | Used only for unidirectional buffering, not switching; lacks hot-swap safety | Choose only for fixed-path signal conditioning where dynamic control is unnecessary |
Compared with SN74CBT1G125DBVT, SN74LVC1G3157DBVR offers broader voltage support but sacrifices speed and adds transition latency, while NC7SZ125P5X eliminates switching capability entirely - making SN74CBT1G125DBVT the sole choice for compact, high-speed, actively controlled bidirectional bus isolation.
Availability
SN74CBT1G125DBVT is available at Aetrix Electronics and suitable for industrial automation interfaces, embedded test instrumentation, and high-density PCB interconnects requiring stable component supply and long-term lifecycle support.
Supply support for SN74CBT1G125DBVT 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 SN74CBT1G125 series belongs to TI's CBT (CrossBar Technology) bus switch family, designed specifically for low-latency, low-distortion signal routing in high-speed digital systems where pin count, power, and timing precision are critical.
FAQ
What is the maximum continuous current rating for the SN74CBT1G125DBVT?
The SN74CBT1G125DBVT supports a continuous channel current of 128 mA, as specified in its absolute maximum ratings. This value reflects the peak DC current the internal FET can sustain without thermal runaway under recommended operating conditions (VCC = 4–5.5 V, TA = –40°C to 85°C). Exceeding this limit risks permanent degradation of on-resistance and switching reliability. Derating is advised above 70°C ambient.
Does the SN74CBT1G125DBVT support 1.8-V logic inputs?
No, the SN74CBT1G125DBVT does not support 1.8-V logic inputs. Its control input thresholds are TTL-compatible: VIL = 0.8 V max and VIH = 2 V min. Applying 1.8-V logic directly to OE may result in indeterminate switching behavior. For 1.8-V systems, use SN74LVC1G3157DBVR or add a discrete level shifter to ensure reliable OE activation.
Can the SN74CBT1G125DBVT be used for analog signal switching?
Yes, the SN74CBT1G125DBVT supports analog signal switching within its voltage limits: signals from GND to VCC (up to 5.5 V) pass bidirectionally with minimal distortion. Its 5–7 Ω on-resistance and 3 pF input capacitance preserve bandwidth for signals up to ~100 MHz. However, it lacks guaranteed analog specifications (e.g., THD, crosstalk), so system-level validation is required for precision analog paths.
What is the thermal resistance (θJA) of the SN74CBT1G125DBVT in its SOT-23 package?
The SN74CBT1G125DBVT in the SOT-23 (DBV) package has a junction-to-ambient thermal resistance (θJA) of 206°C/W, measured per JESD 51-7 on a standard 1-inch² copper pad. This value assumes no additional heatsinking. For sustained 100-mA operation at 85°C ambient, junction temperature rises to ~106°C - within the 150°C storage limit but approaching the practical reliability limit; PCB copper area should be maximized for thermal relief.
Is the SN74CBT1G125DBVT pin-compatible with other members of the SN74CBT1Gxxx family?
Yes, the SN74CBT1G125DBVT shares identical pinout (OE, A, GND, VCC, B) and SOT-23 (DBV) package with SN74CBT1G32, SN74CBT1G126, and SN74CBT1G3157 in the same package variant. However, functional differences exist: SN74CBT1G126 is inverting, SN74CBT1G32 is a dual-input OR gate, and SN74CBT1G3157 includes break-before-make. Electrical parameters (ron, tpd, ICC) also vary - verify per-datasheet before substitution.
SN74CBT1G125DBVT 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
SN74CBT1G125DBVT FAQ
1.How can I place an order for SN74CBT1G125DBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT1G125DBVT 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 SN74CBT1G125DBVT reliable?
The price and inventory of SN74CBT1G125DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT1G125DBVT is usually 5 days.
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Once your SN74CBT1G125DBVT order is processed, you will receive an email with the shipment details and tracking number.
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5.How can I obtain technical support or documentation for SN74CBT1G125DBVT?
For technical support, including SN74CBT1G125DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT1G125DBVT requirements.
6.How does Aetrix verify that SN74CBT1G125DBVT is sourced from the original manufacturer or authorized distributors?
All SN74CBT1G125DBVT 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 SN74CBT1G125DBVT meets industry standards.
7.What is the process for return or replacement of SN74CBT1G125DBVT?
All SN74CBT1G125DBVT units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT1G125DBVT, 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 SN74CBT1G125DBVT part is unused and in its original packaging.
Return procedure for SN74CBT1G125DBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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