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Texas Instruments 74CBTD3861DBQRG4
- Part No.:
- 74CBTD3861DBQRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74CBTD3861DBQRG4.pdf
- Description:
- IC BUS SW 10 X 1:1 24SSOP/QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,217
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Product details
Overview
74CBTD3861DBQRG4 from Texas Instruments is a 10-bit FET bus switch with integrated level-shifting capability, designed for bidirectional 5-V-to-3.3-V signal translation between logic domains. It features 5-Ω on-state resistance, TTL-compatible control inputs, and single OE-enabled switching. Used in mixed-voltage memory/data bus interfacing where low propagation delay (<0.35 ns) and high isolation (>4 pF off-capacitance) are critical.
For engineers reviewing the 74CBTD3861DBQRG4 datasheet, 74CBTD3861DBQRG4 pinout, 74CBTD3861DBQRG4 application, or 74CBTD3861DBQRG4 equivalent, key selection criteria include verified 5-Ω ron, guaranteed 4.5–5.5 V VCC operation, SSOP-24 package thermal performance (θJA = 61°C/W), and diode-based level-shifting architecture confirmed for 5-V input → 3.3-V output translation.
Technical Context
This device implements a single 10-bit bidirectional analog switch array using NMOS FETs with integrated input clamp diodes to VCC, enabling passive level shifting without external components. The OE-controlled switch operates in two states: low-OE connects A1–A10 to B1–B10 with sub-nanosecond propagation delay; high-OE places both ports in high-impedance isolation.
It is not a logic gate or translator IC - no voltage regulation, buffering, or signal conditioning occurs. Its behavior is defined solely by on-resistance, off-capacitance, and diode conduction thresholds. All 10 channels share one OE terminal and operate synchronously under identical supply and temperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL systems while maintaining stable ron and level-shift margin. |
| ron (Typ) | 5 Ω at VCC = 4.5 V, II = 30 mA - enables minimal voltage drop (<150 mV) and preserves signal integrity across 10-bit parallel buses. |
| tpd (Max) | 0.35 ns - supports >1 GHz data rates in short-trace applications without timing skew between bits. |
| Cio(OFF) | 4 pF - ensures high off-isolation for noise-sensitive mixed-signal environments like ADC/DAC interface paths. |
| Level Shift | 5-V input → 3.3-V output via internal VCC-clamp diode - eliminates need for external resistors or translators in legacy-to-modern logic interconnects. |
| OE Threshold | VIL ≤ 0.8 V, VIH ≥ 2 V - guarantees reliable TTL-level control from standard microcontroller GPIOs without level shifters. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded systems including motor control and instrumentation interfaces. |
Pinout & Package
74CBTD3861DBQRG4 is housed in a 24-pin SSOP (DBQ) package with 0.65 mm pitch, 7.9 mm × 4.9 mm body, and 1.2 mm max height. Pin 1 is located at top-left corner with index area marking; leads are gull-wing, NIPDAU-finished, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | No Connect (NC) | Internally unconnected - must remain floating or grounded per layout best practice; no electrical function. |
| 2–11 | A1–A10 | Input/output port A - bidirectional signal path; connects to 5-V domain in level-shifting configuration. |
| 12 | GND | Power ground reference - must be low-impedance plane; shared return for all switch channels and control logic. |
| 13 | VCC | 5-V supply - powers internal clamp diodes and defines output voltage ceiling for level-shifted signals. |
| 14 | OE | Active-low output enable - synchronous control for all 10 channels; drives low to enable A↔B connection. |
| 15–23 | B1–B10 | Input/output port B - bidirectional signal path; outputs 3.3-V logic when A-side driven with 5-V signals. |
Key Features
| Feature | Design Value |
|---|---|
| 10-bit bidirectional switching | Single OE controls all 10 channels simultaneously - simplifies timing-critical bus arbitration and reduces control pin count. |
| Integrated level-shifting diode | VCC-referenced clamp enables 5-V→3.3-V translation without external components - cuts BOM cost and board space in mixed-voltage designs. |
| Low on-state resistance | 5 Ω typical ensures <150 mV drop at 30 mA per channel - maintains logic high/low margins across full 10-bit bus under load. |
| TTL-compatible control inputs | VIH = 2 V min / VIL = 0.8 V max - interoperates directly with legacy 5-V microcontrollers and CPLDs without interface logic. |
| High off-isolation | 4 pF off-capacitance minimizes crosstalk between active and disabled buses - critical for multi-drop memory or peripheral expansion. |
Applications
| Memory Bus Interface | Microcontroller Peripheral Expansion |
|---|---|
|
Use Scenario: Interfacing a 5-V SRAM or Flash memory to a 3.3-V microcontroller bus. IC Role / Device Role / Timing Role: Bidirectional level-shifting bus switch enabling data/address transfer between mismatched voltage domains without timing penalty. Use Value: Eliminates need for discrete resistor-divider or dedicated level translator ICs while preserving sub-nanosecond propagation delay across all 10 data lines. |
Use Scenario: Adding 10-bit GPIO expansion to a 3.3-V ARM Cortex-M MCU using legacy 5-V peripheral ICs. IC Role / Device Role / Timing Role: Synchronous bus switch controlled by MCU GPIO, translating control/status signals between voltage domains. Use Value: Enables direct connection of 5-V sensors, displays, or encoders to 3.3-V processors with no added latency or signal distortion. |
| FPGA I/O Voltage Translation | Industrial PLC Backplane Interconnect |
|
Use Scenario: Connecting 5-V legacy I/O modules to a 3.3-V FPGA-based controller in reconfigurable logic systems. IC Role / Device Role / Timing Role: High-speed bidirectional switch providing deterministic timing for parallel status/control word transfers. Use Value: Delivers consistent 0.35 ns tpd across all 10 lanes - avoids skew-induced setup/hold violations in FPGA register capture paths. |
Use Scenario: Isolating and translating 10-bit diagnostic or configuration data between 5-V fieldbus controllers and 3.3-V monitoring subsystems. IC Role / Device Role / Timing Role: Electrically isolated bus switch with high off-capacitance (4 pF) preventing noise coupling in noisy industrial environments. Use Value: Maintains signal integrity over long backplane traces while supporting –40°C to +85°C operation without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3861DBQR | Same die, identical pinout and specs; G4 suffix denotes RoHS-compliant NiPdAu finish - functionally identical to 74CBTD3861DBQRG4. | No functional difference; used interchangeably in new designs requiring same reliability and solderability profile. | Select when sourcing from TI's current production line with updated material finish compliance. |
| 74LVC4245APW | Octal dual-supply translator (not bus switch); requires separate VCCA/VCCB; higher propagation delay (5.5 ns), no ron specification. | Best for point-to-point level translation with direction control; unsuitable for high-speed bidirectional bus sharing. | Choose only if direction-controlled 8-bit translation is needed and sub-ns timing is not required. |
Compared with SN74CBT3861DBQR, 74CBTD3861DBQRG4 offers identical functionality but reflects TI's updated packaging and finish standards; compared with 74LVC4245APW, it delivers 15× faster propagation, true bidirectionality without direction pins, and deterministic analog switch behavior instead of logic-level translation.
Availability
74CBTD3861DBQRG4 is available at Aetrix Electronics and suitable for industrial control systems, FPGA-based prototyping platforms, and mixed-voltage memory subsystems requiring stable component supply and long-term lifecycle support.
Supply support for 74CBTD3861DBQRG4 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 interface solutions.
The SN74CBTD3861 belongs to TI's CBTD-series bus switches, engineered specifically for high-speed, low-distortion voltage-domain bridging in industrial and computing infrastructure where timing predictability and signal fidelity are non-negotiable.
FAQ
What is the maximum continuous current per channel for the 74CBTD3861DBQRG4?
The 74CBTD3861DBQRG4 supports up to 128 mA continuous channel current, as specified in its absolute maximum ratings. This rating applies to each individual A/B channel pair under steady-state DC conditions. Operation above this limit risks permanent damage, and design margins should maintain peak current below 100 mA for long-term reliability in industrial applications.
Does the 74CBTD3861DBQRG4 support 3.3-V input to 5-V output level shifting?
No, the 74CBTD3861DBQRG4 is designed specifically for 5-V-to-3.3-V level shifting via its internal VCC-clamp diode architecture. Driving port B with 3.3-V signals does not produce 5-V outputs on port A - the device lacks active pull-up or charge-pump circuitry. It functions only as a passive, diode-limited switch optimized for downward translation.
Can unused A or B pins be left floating on the 74CBTD3861DBQRG4?
No - all unused A and B pins must be terminated to GND or VCC to prevent floating nodes that could induce leakage, oscillation, or ESD susceptibility. TI explicitly recommends tying unused control and data pins to valid logic levels; floating terminals may cause unpredictable ron behavior and violate recommended operating conditions.
What is the thermal resistance (θJA) of the 74CBTD3861DBQRG4 in its SSOP-24 package?
The 74CBTD3861DBQRG4 in the DBQ (SSOP-24) package has a published junction-to-ambient thermal resistance (θJA) of 61°C/W under standard JEDEC test conditions. This value assumes a 2-layer PCB with 1-in² copper pour; actual thermal performance improves with enhanced copper area, thermal vias, or airflow in production layouts.
Is the 74CBTD3861DBQRG4 pin-compatible with other packages in the SN74CBTD3861 family?
Yes - all SN74CBTD3861 variants (DW, DB, DBQ, PW, DGV) share identical 24-pin pinout and signal mapping, including NC, A1–A10, GND, VCC, OE, and B1–B10. Mechanical dimensions differ, but PCB footprint compatibility is maintained across SOIC, SSOP, TSSOP, and TVSOP packages, enabling drop-in replacement during prototyping or sourcing transitions.
74CBTD3861DBQRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTD
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Bus Switch
- Circuit:
- 10 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:
- 24-SSOP
74CBTD3861DBQRG4 FAQ
1.How can I place an order for 74CBTD3861DBQRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CBTD3861DBQRG4 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 74CBTD3861DBQRG4 reliable?
The price and inventory of 74CBTD3861DBQRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CBTD3861DBQRG4 is usually 5 days.
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74CBTD3861DBQRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CBTD3861DBQRG4 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 74CBTD3861DBQRG4?
For technical support, including 74CBTD3861DBQRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CBTD3861DBQRG4 requirements.
6.How does Aetrix verify that 74CBTD3861DBQRG4 is sourced from the original manufacturer or authorized distributors?
All 74CBTD3861DBQRG4 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 74CBTD3861DBQRG4 meets industry standards.
7.What is the process for return or replacement of 74CBTD3861DBQRG4?
All 74CBTD3861DBQRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74CBTD3861DBQRG4, 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 74CBTD3861DBQRG4 part is unused and in its original packaging.
Return procedure for 74CBTD3861DBQRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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