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Texas Instruments SN74CBTD1G125DBVR
- Part No.:
- SN74CBTD1G125DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SN74CBTD1G125DBVR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:9,105
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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, TTL-compatible control inputs, and operates from 4.5 V to 5.5 V supply. It is used in voltage-level translation for I²C, SMBus, and low-voltage microcontroller interface applications.
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 = 5 V, fast enable/disable timing (2–5.9 ns), and SOT-23 package compatibility with space-constrained PCB layouts.
Technical Context
The SN74CBTD1G125 implements a single NMOS pass-gate switch controlled by an active-low OE input, enabling bidirectional signal flow between A and B ports when enabled. Its internal VCC-referenced diode enables 5-V-to-3.3-V level shifting without external components.
It supports hot-swap operation with no DC path between ports when disabled, exhibits latch-up immunity exceeding 100 mA per JESD 78 Class II, and maintains ESD robustness per JESD 22 (2000-V HBM, 200-V MM). The device operates over –40°C to 85°C and requires no pull-up resistors on control inputs when tied to VCC or GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, ensuring minimal voltage drop and signal integrity for ≤128 mA channel current |
| Propagation delay (tpd) | 0.25 ns typical at CL = 50 pF, enabling high-speed data routing in timing-critical interfaces |
| Enable time (ten) | 2–5.9 ns max, supporting fast bus arbitration and dynamic signal gating |
| Supply voltage (VCC) | 4.5 V to 5.5 V, compatible with standard 5-V logic rails while delivering 3.3-V output levels |
| Input voltage range (VI) | –0.5 V to 7 V, allowing safe interfacing with overvoltage-tolerant systems and mixed-voltage buses |
| ESD rating | 2000-V HBM, protecting against handling damage during assembly and field operation |
| Operating temperature | –40°C to +85°C, suitable for industrial and automotive under-hood peripheral modules |
Pinout & Package
SOT-23 (DBV) 5-pin package: 1.45 mm max height, 2.9 mm × 1.6 mm footprint, lead pitch 0.95 mm, RoHS-compliant NiPdAu/Sn 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 (≤0.8 V), OFF when high (≥2 V) |
| 2 - A | Port A terminal | Bidirectional signal path; accepts 5-V inputs and outputs 3.3-V levels via internal level-shifting diode |
| 3 - GND | Ground reference | Return path for control logic and switch current; must be low-impedance for stable switching |
| 4 - B | Port B terminal | Bidirectional signal path; connects to 3.3-V domain; voltage follows A when enabled |
| 5 - VCC | Power supply | 5-V rail powering internal circuitry and defining level-shift reference; decoupling capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| Integrated level shifting | Enables direct 5-V-to-3.3-V bidirectional translation without external resistors or translators |
| Low on-resistance (5 Ω) | Minimizes insertion loss and preserves rise/fall times for signals up to 100 MHz |
| TTL-compatible OE input | Accepts standard 5-V logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), simplifying interface with legacy controllers |
| Hot-swap capable | No power-on sequencing required; OE can be toggled while A/B ports are live, preventing bus contention |
| Latch-up immunity | Exceeds 100 mA per JESD 78 Class II, ensuring reliability in noisy industrial environments |
Applications
| I²C Bus Level Translation | SMBus Peripheral Interface |
|---|---|
Use Scenario: Interfacing a 5-V microcontroller master with 3.3-V I²C sensors or EEPROMs on the same bus. IC Role / Device Role / Timing Role: Bidirectional level translator placed inline on SDA/SCL lines to maintain signal integrity and protocol compliance. Use Value: Eliminates need for discrete resistor-based translators or dual-supply buffers, reducing BOM count and layout area. |
Use Scenario: Connecting a 5-V host processor to 3.3-V thermal monitors or power management ICs using SMBus. IC Role / Device Role / Timing Role: Signal switch enabling voltage-domain isolation while preserving SMBus timing requirements (≤300 ns rise time). Use Value: Maintains sub-100 ns propagation delay and <5 Ω Ron to avoid violating SMBus timing margins under load. |
| Microcontroller GPIO Expansion | Legacy System Voltage Bridging |
Use Scenario: Extending GPIO count of a 5-V MCU to drive 3.3-V logic peripherals (e.g., ADCs, DACs) without level-shifter ICs. IC Role / Device Role / Timing Role: Configurable signal gate enabling/disabling individual I/O paths under firmware control via OE. Use Value: Provides per-pin enable control with <6 ns disable time, supporting dynamic reconfiguration of I/O mapping. |
Use Scenario: Upgrading a legacy 5-V system board to integrate modern 3.3-V communication ICs (e.g., UART transceivers, CAN PHYs). IC Role / Device Role / Timing Role: Standalone voltage bridge replacing custom discrete solutions, maintaining signal fidelity across mixed-rail subsystems. Use Value: Delivers guaranteed 5-Ω Ron and 0.25-ns tpd-critical for preserving edge rates in high-speed serial links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G125DBVR | CMOS buffer (non-level-shifting), 3.3-V only I/O, no VCC-referenced diode | Requires external level shifters for 5-V interface; unsuitable for bidirectional 5-V↔3.3-V translation | Select only if operating exclusively in 3.3-V domain with no mixed-voltage requirement |
| TS3A24157RGTR | Dual SPDT analog switch, 0.7-Ω Ron, 1.65–3.6-V supply, no 5-V tolerance | Cannot accept 5-V inputs; lacks integrated level-shifting diode; requires external biasing for 5-V systems | Prefer for low-Ron analog signal routing below 3.6 V; not a functional substitute for SN74CBTD1G125's 5-V input capability |
Compared with SN74CBTD1G125, SN74LVC1G125DBVR lacks level shifting and 5-V input tolerance, while TS3A24157RGTR offers lower Ron but no 5-V compatibility-making SN74CBTD1G125 uniquely suited for robust 5-V-to-3.3-V bidirectional digital translation in compact SOT-23 form.
Availability
SN74CBTD1G125DBVR is available at Aetrix Electronics and suitable for I²C bus translation, SMBus peripheral interfacing, and microcontroller GPIO expansion requiring stable component supply and long-term industrial availability.
Supply support for SN74CBTD1G125DBVR 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 expertise in logic and interface solutions.
The SN74CBTD1G125 belongs to TI's CBTD-series single-channel FET bus switches, engineered specifically for low-latency, low-Ron voltage-level bridging in mixed-supply digital systems.
FAQ
What is the maximum continuous current rating for SN74CBTD1G125DBVR?
The SN74CBTD1G125DBVR supports a continuous channel current of 128 mA, as specified in its Absolute Maximum Ratings table. This rating applies under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = –40°C to 85°C) and assumes proper PCB thermal design. Exceeding this current may cause thermal stress or degradation of the on-state resistance performance in SN74CBTD1G125DBVR.
Does SN74CBTD1G125DBVR support bidirectional signal flow?
Yes, SN74CBTD1G125DBVR supports true bidirectional signal flow between its A and B ports when the OE pin is asserted low. The FET-based architecture provides symmetrical conduction-no directionality is imposed by the device itself. Signal direction is determined solely by the driving source on either side, making SN74CBTD1G125DBVR ideal for I²C, SMBus, and other bidirectional protocols.
Can SN74CBTD1G125DBVR translate 3.3-V signals to 5-V levels?
No, SN74CBTD1G125DBVR performs only 5-V-to-3.3-V level shifting via its integrated VCC-referenced diode. When a 5-V signal is applied to the A port, the B port outputs ~3.3 V. Applying 3.3 V to B does not raise A to 5 V-the device is unidirectional in level-shifting capability. For reverse translation, a separate solution such as SN74AVC2T244 is required alongside SN74CBTD1G125DBVR.
What is the recommended decoupling for SN74CBTD1G125DBVR?
A 0.1-µF ceramic capacitor placed as close as possible to the VCC (Pin 5) and GND (Pin 3) pins is recommended for SN74CBTD1G125DBVR. This minimizes supply noise and ensures stable switching performance, especially during fast enable/disable transitions. For systems with multiple SN74CBTD1G125DBVR devices or high-frequency switching, a bulk 4.7-µF tantalum or aluminum electrolytic capacitor near the power entry point further improves stability.
Is SN74CBTD1G125DBVR pin-compatible with other 5-pin SOT-23 bus switches?
SN74CBTD1G125DBVR uses the standard DBV (SOT-23) 5-pin pinout: Pin 1 = OE, Pin 2 = A, Pin 3 = GND, Pin 4 = B, Pin 5 = VCC. This matches TI's industry-standard logic switch pinout and is mechanically compatible with PCB footprints for SN74LVC1G125DBVR and SN74AUP1G125DBVR-but those parts lack level-shifting capability. Electrical compatibility requires verifying control logic thresholds and voltage domain alignment before substitution.
SN74CBTD1G125DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTD
- 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
SN74CBTD1G125DBVR FAQ
1.How can I place an order for SN74CBTD1G125DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTD1G125DBVR 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 SN74CBTD1G125DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD1G125DBVR is usually 5 days.
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Once your SN74CBTD1G125DBVR 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 SN74CBTD1G125DBVR?
For technical support, including SN74CBTD1G125DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD1G125DBVR requirements.
6.How does Aetrix verify that SN74CBTD1G125DBVR is sourced from the original manufacturer or authorized distributors?
All SN74CBTD1G125DBVR 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 SN74CBTD1G125DBVR meets industry standards.
7.What is the process for return or replacement of SN74CBTD1G125DBVR?
All SN74CBTD1G125DBVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD1G125DBVR, 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 SN74CBTD1G125DBVR part is unused and in its original packaging.
Return procedure for SN74CBTD1G125DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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