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Texas Instruments SN74CBTD1G125DCKT
- Part No.:
- SN74CBTD1G125DCKT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
SN74CBTD1G125DCKT.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,223
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Product details
Overview
SN74CBTD1G125DCKT from Texas Instruments is a single-channel FET bus switch with level-shifting capability, designed for bidirectional signal routing between 5-V and 3.3-V logic domains. It features 5-Ω on-state resistance, <5 ns enable/disable timing, TTL-compatible control input (VIH = 2 V, VIL = 0.8 V), and operates from 4.5 V to 5.5 V supply. It is used in voltage-level translation for data buses in industrial microcontroller interfaces.
For engineers reviewing the SN74CBTD1G125DCKT datasheet, SN74CBTD1G125DCKT pinout, SN74CBTD1G125DCKT application, or SN74CBTD1G125DCKT equivalent, key selection criteria include on-resistance matching, level-shift directionality (5 V → 3.3 V), OE-controlled isolation, and SC-70 package thermal performance (θJA = 252°C/W).
Technical Context
The SN74CBTD1G125DCKT implements a single NMOS transmission gate with integrated VCC-referenced diode for passive level shifting - enabling 5-V inputs to drive 3.3-V outputs without external biasing. Its OE pin controls conduction state with active-low logic (OE = L enables A↔B path; OE = H disconnects).
It supports bidirectional signal flow with no internal direction control, relies on external voltage domain management, and exhibits sub-nanosecond propagation delay (tpd = 0.25 ns) due to low Ron–CL time constant. The device complies with JESD 22 ESD standards (2000-V HBM, 200-V MM) and exceeds 100 mA latch-up immunity per JESD 78 Class II.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, 30 mA - ensures minimal voltage drop and signal integrity in high-speed digital paths |
| Propagation delay (tpd) | 0.25 ns max at CL = 50 pF - supports >1 GHz signal switching in short-trace applications |
| Enable time (ten) | 2–5.9 ns - defines minimum pulse width for reliable OE-controlled bus activation |
| Supply voltage (VCC) | 4.5 V to 5.5 V - matches standard 5-V logic rails while enabling 3.3-V output compatibility |
| Input voltage range (VI) | –0.5 V to 7 V - accommodates overvoltage transients and mixed-voltage interface margins |
| ESD rating (HBM) | 2000 V - meets industrial I/O robustness requirements without external protection |
| Operating temperature | –40°C to +85°C - qualified for extended industrial ambient conditions |
Pinout & Package
SN74CBTD1G125DCKT uses the SC-70 (DCK) 5-pin surface-mount package (2.47 mm × 2.3 mm × 1.25 mm, 1.1 mm max height), optimized for space-constrained PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Output-enable control input | Active-low logic: OE = low enables A↔B conduction; OE = high isolates ports with high-impedance state |
| 2 - A | Port A terminal | Bidirectional signal node - connects to 5-V domain source or sink; integrates clamp diode to VCC |
| 3 - GND | Ground reference | Power return path for internal circuitry and ESD protection network |
| 4 - B | Port B terminal | Bidirectional signal node - connects to 3.3-V domain load; level-shifted output when A driven at 5 V |
| 5 - VCC | Positive supply | 5-V rail input that biases internal diode and defines output high-level threshold (VOH ≈ VCC – 0.3 V) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated level-shifting diode | Enables passive 5-V-to-3.3-V translation without external components or bias networks |
| TTL-compatible OE input | Accepts standard 5-V TTL logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), eliminating need for level translators on control line |
| Low on-state resistance | 5 Ω typical minimizes RC delay and signal attenuation in high-frequency data paths up to 100 MHz |
| Fast switching performance | Sub-6 ns enable/disable times support burst-mode or strobed bus architectures with tight timing budgets |
| Robust ESD protection | 2000-V HBM rating reduces risk of field failure during handling and system integration |
Applications
| Industrial PLC I/O Expansion | Embedded MCU Peripheral Interface |
|---|---|
Use Scenario: Connecting legacy 5-V sensor modules to modern 3.3-V microcontrollers in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level translator and bus switch enabling safe, low-latency communication across voltage domains. Use Value: Eliminates discrete resistor-divider or active translator circuits, reducing BOM count and board area while maintaining signal fidelity at 25 MHz update rates. | Use Scenario: Isolating debug UART lines during firmware updates to prevent unintended peripheral activation. IC Role / Device Role / Timing Role: OE-controlled signal gate that decouples host UART TX/RX from target peripheral until boot sequence completes. Use Value: Prevents spurious commands during power-up by enforcing controlled enable timing (<6 ns), improving system reliability. |
| Test Equipment Signal Routing | Automated Test Fixture Interfacing |
Use Scenario: Multiplexing multiple DUT signals onto shared 3.3-V acquisition channels in benchtop test instruments. IC Role / Device Role / Timing Role: Low-Ron analog switch providing repeatable impedance-matched paths for digital test vectors. Use Value: Maintains <1% signal distortion at 50 MHz due to 5-Ω Ron and <4 pF off-capacitance, ensuring measurement accuracy. | Use Scenario: Adapting production test fixtures between 5-V legacy devices and newer 3.3-V SoC platforms. IC Role / Device Role / Timing Role: Voltage-domain bridge allowing reuse of existing fixture wiring and firmware without hardware redesign. Use Value: Reduces test-system requalification effort by preserving timing-critical signal paths and eliminating layout changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G125DCKR | CMOS-based, no integrated level-shifting diode; requires external bias for 5-V→3.3-V translation | Limited to same-voltage-domain buffering; unsuitable for mixed-rail translation without added components | Select when only 3.3-V-only signal gating is needed and board space allows external bias network |
| TS3A27518EYFFR | 3-channel, 0.7-Ω Ron, supports 1.65–5.5 V dual-supply operation; no built-in VCC-referenced diode | Requires dual supplies for true level shifting; higher channel count but larger 16-pin QFN footprint | Select when multi-channel routing and lower Ron are prioritized over single-channel compactness and passive translation |
Compared with SN74CBTD1G125DCKT, SN74LVC1G125DCKR lacks native level shifting and demands external circuitry for cross-voltage use, while TS3A27518EYFFR offers superior Ron and flexibility at the cost of complexity, size, and supply configuration overhead.
Availability
SN74CBTD1G125DCKT is available at Aetrix Electronics and suitable for industrial automation, embedded test instrumentation, and mixed-voltage MCU interface designs requiring stable component supply and long-term manufacturability.
Supply support for SN74CBTD1G125DCKT 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 SN74CBTD1G125DCKT belongs to TI's 74CBT family of advanced bus switches, engineered specifically for low-distortion, high-speed voltage-level translation in industrial and communications infrastructure applications.
FAQ
What is the maximum continuous current rating for SN74CBTD1G125DCKT?
The SN74CBTD1G125DCKT supports a continuous channel current of 128 mA, verified under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = –40°C to +85°C). This rating applies to steady-state conduction through the A–B path and is limited by thermal dissipation in the SC-70 package (θJA = 252°C/W). Exceeding this current may cause junction overheating and parametric shift.
Does SN74CBTD1G125DCKT support bidirectional level shifting?
Yes, SN74CBTD1G125DCKT supports bidirectional signal flow, but its level-shifting function is unidirectional: it translates 5-V signals applied to port A into ~3.3-V compatible levels at port B via the internal VCC-referenced diode. When driven from port B, no level shifting occurs - the device acts as a passive switch with VOH ≈ VCC – 0.3 V regardless of drive direction.
Can SN74CBTD1G125DCKT operate with a 3.3-V supply?
No, SN74CBTD1G125DCKT requires a 4.5-V to 5.5-V supply (VCC) to meet its specified performance - including 5-Ω Ron, 2-V VIH, and integrated diode functionality. Operating below 4.5 V violates recommended conditions and degrades switching speed, increases Ron, and compromises level-shifting behavior. For 3.3-V-only systems, consider SN74LVC1G125DCKR instead.
What is the meaning of "NRND" status for SN74CBTD1G125DCKT?
"NRND" (Not Recommended for New Designs) indicates that SN74CBTD1G125DCKT remains in production and available for purchase, but TI advises against using it in new product development due to roadmap considerations. Existing designs may continue sourcing; Aetrix Electronics maintains inventory and supports lifecycle management for legacy programs requiring this part.
How does the OE pin behave electrically on SN74CBTD1G125DCKT?
The OE pin on SN74CBTD1G125DCKT is an active-low control input with TTL-compatible thresholds: VIH ≥ 2 V disables the switch (A–B high-Z), and VIL ≤ 0.8 V enables conduction. Input leakage is ±1 µA max, and input capacitance is 2 pF. All unused OE pins must be tied to VCC or GND - floating states may cause partial turn-on and increased ICC.
SN74CBTD1G125DCKT 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
SN74CBTD1G125DCKT FAQ
1.How can I place an order for SN74CBTD1G125DCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTD1G125DCKT 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 SN74CBTD1G125DCKT reliable?
The price and inventory of SN74CBTD1G125DCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD1G125DCKT is usually 5 days.
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Once your SN74CBTD1G125DCKT 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 SN74CBTD1G125DCKT?
For technical support, including SN74CBTD1G125DCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD1G125DCKT requirements.
6.How does Aetrix verify that SN74CBTD1G125DCKT is sourced from the original manufacturer or authorized distributors?
All SN74CBTD1G125DCKT 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 SN74CBTD1G125DCKT meets industry standards.
7.What is the process for return or replacement of SN74CBTD1G125DCKT?
All SN74CBTD1G125DCKT units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD1G125DCKT, 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 SN74CBTD1G125DCKT part is unused and in its original packaging.
Return procedure for SN74CBTD1G125DCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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