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Texas Instruments SN74CBTD1G125DCKR
- Part No.:
- SN74CBTD1G125DCKR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
SN74CBTD1G125DCKR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,227
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Product details
Overview
SN74CBTD1G125 from Texas Instruments is a single-channel FET bus switch with integrated level shifting, designed for bidirectional signal routing between 5-V and 3.3-V logic domains. It features 5-Ω on-state resistance, 0.25-ns propagation delay, and TTL-compatible control input levels (VIH = 2 V, VIL = 0.8 V) operating at 4.5–5.5 V supply. It is used in voltage-level translation within digital interface paths such as I²C, SMBus, or GPIO expansion.
For engineers reviewing the SN74CBTD1G125 datasheet, SN74CBTD1G125 pinout, SN74CBTD1G125 application, or SN74CBTD1G125 equivalent, key selection criteria include on-resistance matching, level-shifting capability across VCC = 4.5–5.5 V, low capacitive loading (Cio(OFF) = 3.5 pF), and SC-70 (DCK) package compatibility with high-density PCB layouts.
Technical Context
The SN74CBTD1G125 implements a single NMOS pass-gate switch with an integrated diode to VCC for unidirectional level shifting - enabling 5-V inputs to drive 3.3-V outputs without external components. Its OE-controlled enable/disable logic follows positive-logic behavior: OE low enables A↔B conduction; OE high disconnects both ports.
Switch operation is optimized for low RC delay: typical on-resistance of 5 Ω combined with 3.5-pF off-state capacitance yields sub-nanosecond propagation (tpd = 0.25 ns) under CL = 50 pF. The device meets JESD 22 ESD standards (2000-V HBM, 200-V MM) and JESD 78 latch-up Class II compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across standard 5-V rail tolerances |
| ron (On-State Resistance) | 5 Ω typical at VCC = 4.5 V, II = 30 mA - minimizes voltage drop and signal distortion in high-speed data paths |
| tpd (Propagation Delay) | 0.25 ns typical - supports >1-GHz signal integrity in short-reach interconnects |
| Cio(OFF) | 3.5 pF - reduces crosstalk and dynamic power in high-frequency switching applications |
| VIH / VIL | 2 V / 0.8 V - guarantees reliable TTL-level control interface without level-shifter circuitry |
| ESD Rating | 2000-V HBM - protects against handling-induced discharge during assembly and field operation |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems and peripheral interfaces |
Pinout & Package
SN74CBTD1G125 is housed in a 5-pin SC-70 (DCK) package - 2.0 mm × 1.25 mm footprint, 1.1 mm max height, lead pitch of 0.65 mm - optimized for space-constrained board designs. Pin 1 is located in quadrant Q3 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low TTL-compatible control input; drives internal gate to enable/disable pass transistor |
| 2 (A) | Port A Terminal | Bidirectional signal terminal connected to 5-V domain; includes integrated clamp diode to VCC |
| 3 (GND) | Ground Reference | Power return path for internal circuitry and substrate biasing of NMOS switch |
| 4 (B) | Port B Terminal | Bidirectional signal terminal connected to 3.3-V domain; level-shifted output of A port |
| 5 (VCC) | Supply Voltage | 5-V supply input powering internal logic and diode clamp; defines high-level reference for level shifting |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Level Shifting | Enables direct 5-V-to-3.3-V signal translation without external resistors or translators |
| Low On-Resistance | 5 Ω typical ensures minimal insertion loss and preserves signal edge rate in high-speed buses |
| TTL-Compatible Control | OE input accepts standard 5-V TTL thresholds, eliminating need for additional logic-level adaptation |
| Ultra-Fast Switching | 0.25-ns tpd and 4.7-ns tdis support timing-critical applications like clock distribution and data strobing |
| Low Off-Capacitance | 3.5 pF isolation capacitance prevents signal coupling between disconnected ports during standby |
Applications
| PCI Express Lane Multiplexing | I²C Bus Voltage Translation |
|---|---|
Use Scenario: Dynamically routing PCIe Gen1/Gen2 lanes between two controllers sharing a common physical connector. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling lane reconfiguration without protocol-aware logic. Use Value: 5-Ω ron and 0.25-ns tpd preserve PCIe eye diagram integrity; SC-70 footprint saves board area in M.2 or mini-PCIe modules. | Use Scenario: Interfacing 5-V microcontroller GPIOs to 3.3-V sensor nodes on shared I²C bus. IC Role / Device Role / Timing Role: Level-shifting bus switch isolating voltage domains while maintaining bidirectional SDA/SCL signaling. Use Value: Integrated VCC-clamp diode eliminates external pull-up resistor mismatch issues; 3.5-pF Cio(OFF) prevents bus loading during idle states. |
| USB 2.0 Data Line Isolation | FPGA Configuration Interface Switching |
Use Scenario: Enabling/disabling USB D+/D− lines during hot-plug detection or dual-host arbitration. IC Role / Device Role / Timing Role: High-speed analog switch providing galvanic isolation between host and peripheral PHY layers. Use Value: Sub-1-ns enable/disable times (ten = 2 ns, tdis = 1 ns) meet USB 2.0 suspend/resume timing budgets. | Use Scenario: Selecting between primary and backup configuration bitstreams loaded into FPGA via SPI or parallel interface. IC Role / Device Role / Timing Role: Single-pole single-throw (SPST) switch controlling data path between configuration PROM and FPGA pins. Use Value: 5-V tolerant A port accepts industrial PROM outputs; 3.3-V compatible B port matches FPGA I/O voltage; OE allows synchronous switching with reset assertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G3157DCKR | Lower VCC range (1.65–5.5 V); 6-Ω ron; no integrated level-shifting diode | Requires external level-shifting for 5-V-to-3.3-V use; better suited for mixed-voltage systems with variable supply rails | Select when flexible supply operation or lower quiescent current (ICC = 10 µA) is prioritized over built-in level shifting |
| 74AUP1G3157GW,125 | Wider VCC range (0.8–3.6 V); 8-Ω ron; no 5-V tolerance on inputs | Not suitable for 5-V input domains; intended for ultra-low-power 1.8-V/2.5-V/3.3-V only applications | Choose only for battery-powered 3.3-V systems where 5-V compatibility is unnecessary and power efficiency is critical |
Compared with SN74CBTD1G125, SN74LVC1G3157DCKR offers broader supply flexibility but lacks native 5-V-to-3.3-V translation, while 74AUP1G3157GW,125 provides lower ICC yet excludes 5-V input support - making SN74CBTD1G125 uniquely suited for legacy 5-V MCU interfacing with modern 3.3-V peripherals.
Availability
SN74CBTD1G125 is available at Aetrix Electronics and suitable for industrial automation interfaces, embedded sensor hubs, and legacy system upgrades requiring stable component supply with long-term lifecycle visibility.
Supply support for SN74CBTD1G125 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The SN74CBTD1G125 belongs to TI's 74CBT logic family - engineered specifically for high-speed, low-distortion signal switching and voltage-domain bridging in digital interface subsystems.
FAQ
What is the maximum continuous current rating for SN74CBTD1G125?
The SN74CBTD1G125 supports a continuous channel current of 128 mA per channel, as specified in its Absolute Maximum Ratings table. This rating applies under recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to +85°C) and assumes proper PCB thermal design. Exceeding this current may degrade on-resistance stability or accelerate electromigration in the internal FET channel.
Does SN74CBTD1G125 support bidirectional signal flow?
Yes, SN74CBTD1G125 supports fully bidirectional signal transmission between Port A and Port B when enabled. Its NMOS pass-gate architecture has no intrinsic directionality; signal direction depends solely on external voltage gradients. However, the integrated clamp diode to VCC is only present on the A-side, meaning level-shifting functionality is unidirectional (A→B), not B→A.
Can SN74CBTD1G125 operate with a 3.3-V supply voltage?
No, SN74CBTD1G125 requires a minimum VCC of 4.5 V and is rated only for 4.5–5.5 V operation. Applying 3.3 V will result in improper gate biasing of the internal FET, leading to elevated on-resistance (>20 Ω), unreliable switching, and potential failure to meet VIH/VIL thresholds. For 3.3-V systems, consider SN74LVC1G3157 instead.
What is the thermal resistance (θJA) of SN74CBTD1G125 in the DCK package?
The junction-to-ambient thermal resistance (θJA) for SN74CBTD1G125 in the SC-70 (DCK) package is 252°C/W, as documented in the Absolute Maximum Ratings section. This value assumes standard JEDEC test board conditions (single-layer copper, 1-in² pad). Actual thermal performance improves with enhanced PCB copper area and thermal vias beneath the exposed pad region.
Is SN74CBTD1G125 RoHS compliant and lead-free?
Yes, SN74CBTD1G125 is RoHS compliant and features a lead-free finish. Per TI's Packaging Information, the part uses NIPDAU or SN (tin) lead finish, carries a "Yes" RoHS designation, and meets Level-1 moisture sensitivity (MSL-1) with peak reflow temperature of 260°C - fully compatible with standard lead-free soldering processes.
SN74CBTD1G125DCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTD
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- SC-70-5
SN74CBTD1G125DCKR FAQ
1.How can I place an order for SN74CBTD1G125DCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTD1G125DCKR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74CBTD1G125DCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD1G125DCKR is usually 5 days.
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Once your SN74CBTD1G125DCKR 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 SN74CBTD1G125DCKR?
For technical support, including SN74CBTD1G125DCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD1G125DCKR requirements.
6.How does Aetrix verify that SN74CBTD1G125DCKR is sourced from the original manufacturer or authorized distributors?
All SN74CBTD1G125DCKR 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 SN74CBTD1G125DCKR meets industry standards.
7.What is the process for return or replacement of SN74CBTD1G125DCKR?
All SN74CBTD1G125DCKR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD1G125DCKR, 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 SN74CBTD1G125DCKR part is unused and in its original packaging.
Return procedure for SN74CBTD1G125DCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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