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Texas Instruments 74CBTD1G125DCKRG4
- Part No.:
- 74CBTD1G125DCKRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
74CBTD1G125DCKRG4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,323
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Product details
Overview
74CBTD1G125DCKRG4 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, TTL-compatible OE control input, and supports 128-mA continuous channel current. Used in voltage-domain interfacing within mixed-supply digital systems such as FPGA I/O expansion and microcontroller peripheral bridging.
For engineers reviewing the 74CBTD1G125DCKRG4 datasheet, 74CBTD1G125DCKRG4 pinout, 74CBTD1G125DCKRG4 application, or 74CBTD1G125DCKRG4 equivalent, key selection criteria include on-resistance stability across VCC (4.5–5.5 V), sub-6 ns enable/disable timing, ESD robustness (2000-V HBM), latch-up immunity (>100 mA), and SC-70 package thermal impedance (252°C/W).
Technical Context
The 74CBTD1G125DCKRG4 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-controlled switching operates with zero propagation delay (0.25 ns typical) and rail-to-rail analog signal pass-through capability.
It functions as a directionless, low-capacitance (3.5 pF OFF-state) signal bridge with no internal logic state retention. The device requires no power sequencing and supports hot-swap operation due to its overvoltage-tolerant I/O structure (VI = –0.5 to 7 V) and clamp-current-limited inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V supply rails while maintaining stable on-resistance and timing. |
| ron (Typ) | 5 Ω at VCC = 4.5 V - enables minimal signal attenuation and voltage drop (<150 mV at 30 mA) in high-speed data paths. |
| tpd (Max) | 0.25 ns - supports >1 GHz signal integrity in short-trace interconnects without timing skew penalties. |
| ten / tdis (Max) | 5.9 ns / 4.7 ns - guarantees fast bus arbitration and dynamic enable control in burst-mode protocols. |
| Cio(OFF) | 3.5 pF - limits capacitive loading on driven nets, preserving edge rate and reducing crosstalk in dense PCB layouts. |
| ESD Rating | 2000-V HBM - provides robust handling margin during board assembly and field-level electrostatic events. |
| Latch-Up Immunity | >100 mA per JESD 78 Class II - prevents destructive latch-up under transient overvoltage or ground-bounce conditions. |
Pinout & Package
74CBTD1G125DCKRG4 uses the SC-70 (DCK) 5-pin surface-mount package (2.15 × 1.35 × 1.1 mm), optimized for space-constrained applications requiring low thermal resistance (252°C/W) and high-density placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Output Enable control input | Active-low TTL-compatible signal; drives switch ON when low (≤0.8 V), OFF when high (≥2 V). |
| 2 - GND | Power reference ground | Return path for all internal circuitry and substrate bias; must be low-impedance for noise immunity. |
| 3 - A | Input/Output port A | Bidirectional terminal; connects to 5-V domain signals and interfaces with integrated VCC diode for level shifting. |
| 4 - B | Input/Output port B | Bidirectional terminal; delivers level-shifted output to 3.3-V domain with rail-to-rail voltage swing. |
| 5 - VCC | Positive supply | Provides operating bias and defines high-level threshold for OE; also supplies clamping diode anode for level shifting. |
Key Features
| Feature | Design Value |
|---|---|
| Single FET bus switch architecture | Eliminates CMOS logic overhead and propagation delay, enabling true analog signal pass-through with <0.25 ns tpd. |
| Integrated VCC-referenced diode | Enables automatic 5-V-to-3.3-V level shifting without external components or bias networks. |
| TTL-compatible OE input | Accepts standard 5-V logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), simplifying interface with legacy controllers. |
| Low off-state capacitance | 3.5 pF isolation minimizes capacitive coupling between adjacent traces and preserves signal integrity in high-speed buses. |
| Overvoltage-tolerant I/O | Supports VI up to 7 V and –0.5 V, allowing safe operation during power sequencing mismatches or hot-plug events. |
Applications
| FPGA I/O Expansion | Microcontroller Peripheral Bridging |
|---|---|
Use Scenario: Connecting 5-V legacy peripherals (e.g., UART transceivers, SPI EEPROMs) to 3.3-V FPGA I/O banks with mixed-voltage constraints. IC Role / Device Role / Timing Role: Bidirectional level-shifting bus switch enabling seamless voltage-domain translation without added logic latency. Use Value: Eliminates need for discrete resistor-divider or active translator ICs, reducing BOM count and layout area while maintaining sub-nanosecond signal fidelity. | Use Scenario: Interfacing 5-V sensors or displays with 3.3-V ARM Cortex-M microcontrollers in industrial control modules. IC Role / Device Role / Timing Role: OE-gated signal conduit supporting dynamic enable/disable for power-aware peripheral management. Use Value: Enables software-controlled isolation of unused peripherals, reducing system leakage current and improving power efficiency during sleep modes. |
| PCI Express Sideband Signal Routing | USB 2.0 Data Line Level Translation |
Use Scenario: Routing SMBus, CLKREQ#, or PERST# sideband signals between 5-V chipset logic and 3.3-V add-in cards in embedded PCIe systems. IC Role / Device Role / Timing Role: Low-capacitance, low-resistance switch ensuring signal integrity and timing compliance for critical reset and clock request lines. Use Value: Maintains <5 ns enable/disable timing and <3.5 pF off-capacitance to meet PCIe specification requirements for sideband signal rise/fall times and skew. | Use Scenario: Adapting 5-V USB 2.0 upstream data lines (D+/D−) to 3.3-V USB PHYs in portable docking stations or hub controllers. IC Role / Device Role / Timing Role: Passive bidirectional switch supporting full-speed (12 Mbps) USB signaling with no added jitter or duty-cycle distortion. Use Value: Delivers 5-Ω on-resistance and <0.25 ns propagation delay to preserve USB eye diagram margins and ensure interoperability with legacy host controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT1G125DBVR | Same function but SOT-23 (DBV) package; higher thermal impedance (206°C/W) and slightly larger footprint (3.0 × 1.75 mm). | Preferred where board real estate allows larger package and higher thermal mass is acceptable. | Select SN74CBT1G125DBVR only if SC-70 placement constraints prevent use of 74CBTD1G125DCKRG4. |
| 74LVC1G125GW,125 | 3.3-V-only supply; no integrated level shifting; requires external bias for 5-V interface; lower on-resistance (3.5 Ω typical). | Suitable only in pure 3.3-V systems or when level shifting is handled externally via resistive dividers or dedicated translators. | Choose 74LVC1G125GW,125 only when VCC is strictly 3.3 V and level shifting is implemented elsewhere in the signal chain. |
Compared with SN74CBT1G125DBVR and 74LVC1G125GW,125, the 74CBTD1G125DCKRG4 uniquely combines SC-70 miniaturization, native 5-V-to-3.3-V level shifting, and 5-Ω on-resistance - making it the sole option for space-constrained, mixed-voltage bus isolation without added components or layout complexity.
Availability
74CBTD1G125DCKRG4 is available at Aetrix Electronics and suitable for FPGA I/O expansion, microcontroller peripheral bridging, and PCIe sideband signal routing requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 74CBTD1G125DCKRG4 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 with emphasis on reliability, precision, and energy efficiency.
The 74CBTD1G125DCKRG4 belongs to TI's CBTD-series bus switches - engineered specifically for low-latency, low-distortion voltage-domain bridging in mixed-supply digital systems.
FAQ
What is the maximum continuous current rating for the 74CBTD1G125DCKRG4?
The 74CBTD1G125DCKRG4 supports a continuous channel current of 128 mA, verified per Absolute Maximum Ratings in the official datasheet. This rating applies across the full operating temperature range (–40°C to 85°C) and ensures reliable conduction without thermal runaway when used within recommended VCC (4.5–5.5 V) and ambient conditions. Exceeding this current may degrade on-resistance stability or trigger thermal shutdown in sustained operation.
Does the 74CBTD1G125DCKRG4 require external pull-up or pull-down resistors on the OE pin?
No, the 74CBTD1G125DCKRG4 does not require external pull-up or pull-down resistors on the OE pin. Its TTL-compatible input accepts direct connection to 5-V logic outputs, with guaranteed low-level recognition at ≤0.8 V and high-level recognition at ≥2 V. However, TI recommends tying unused control inputs to VCC or GND to prevent floating states that could cause unintended switching or increased ICC.
Can the 74CBTD1G125DCKRG4 be used for bidirectional analog signal switching?
Yes, the 74CBTD1G125DCKRG4 supports bidirectional analog signal switching due to its symmetrical NMOS FET structure and rail-to-rail voltage handling (–0.5 V to 7 V). It maintains consistent on-resistance (5–7 Ω) regardless of signal direction, making it suitable for low-frequency analog paths such as audio line-level signals or sensor outputs - provided signal amplitude remains within the device's absolute maximum voltage ratings and bandwidth limitations (~1.5 GHz small-signal cutoff).
What is the thermal resistance (θJA) of the 74CBTD1G125DCKRG4 in its SC-70 package?
The 74CBTD1G125DCKRG4 has a junction-to-ambient thermal resistance (θJA) of 252°C/W in the SC-70 (DCK) package, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC test board conditions (single-layer 1-in² copper pad). Actual thermal performance improves with enhanced PCB copper area, thermal vias, or airflow - critical for applications operating near maximum ICC (1.5 mA) and continuous channel current limits.
Is the 74CBTD1G125DCKRG4 pin-compatible with other members of the SN74CBTD1Gxxx family?
Yes, the 74CBTD1G125DCKRG4 shares identical pinout and SC-70 (DCK) package dimensions with other SN74CBTD1Gxxx variants such as SN74CBTD1G384 and SN74CBTD1G32 - all featuring OE, GND, A, B, and VCC on pins 1–5 respectively. However, functional differences (e.g., inverting vs. non-inverting, bus-hold vs. switch-only) mean electrical behavior and application suitability are not interchangeable without verifying logic function and timing specifications per datasheet.
74CBTD1G125DCKRG4 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:
- Obsolete
- 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
74CBTD1G125DCKRG4 FAQ
1.How can I place an order for 74CBTD1G125DCKRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CBTD1G125DCKRG4 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 74CBTD1G125DCKRG4 reliable?
The price and inventory of 74CBTD1G125DCKRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CBTD1G125DCKRG4 is usually 5 days.
3.What payment methods are accepted for 74CBTD1G125DCKRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74CBTD1G125DCKRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74CBTD1G125DCKRG4?
74CBTD1G125DCKRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CBTD1G125DCKRG4 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 74CBTD1G125DCKRG4?
For technical support, including 74CBTD1G125DCKRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CBTD1G125DCKRG4 requirements.
6.How does Aetrix verify that 74CBTD1G125DCKRG4 is sourced from the original manufacturer or authorized distributors?
All 74CBTD1G125DCKRG4 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 74CBTD1G125DCKRG4 meets industry standards.
7.What is the process for return or replacement of 74CBTD1G125DCKRG4?
All 74CBTD1G125DCKRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74CBTD1G125DCKRG4, 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 74CBTD1G125DCKRG4 part is unused and in its original packaging.
Return procedure for 74CBTD1G125DCKRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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