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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments SN74CBTD3861DBR

Name: SN74CBTD3861DBR
Brand: Texas Instruments
SKU: SN74CBTD3861DBR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CBTD3861DBR

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 24-SSOP (0.209", 5.30mm Width)

Datasheet:: SN74CBTD3861DBR.pdf

Description:: IC BUS SWITCH 10 X 1:1 24SSOP

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Product details

Overview

SN74CBTD3861DBR from Texas Instruments is a 10-bit FET bus switch with integrated level-shifting capability, designed for bidirectional signal routing between 5-V and 3.3-V logic domains. It features 5-Ω on-state resistance, TTL-compatible inputs, single OE control, and operates across –40°C to 85°C. Used in mixed-voltage memory/data bus interfaces where low propagation delay and voltage translation are critical.

For engineers reviewing the SN74CBTD3861DBR datasheet, SN74CBTD3861DBR pinout, SN74CBTD3861DBR application, or SN74CBTD3861DBR equivalent, key selection criteria include on-resistance (5–7 Ω), level-shifting diode integration, 0.35 ns typical propagation delay, 2.6–10 ns enable time, and SSOP-24 package compatibility with high-density PCB layouts.

Technical Context

This device implements a single 10-bit bidirectional analog switch using NMOS FETs, with internal V_CC-referenced clamping diodes enabling 5-V-to-3.3-V level shifting at the outputs. The OE input controls conduction state with active-low logic: low enables A↔B connectivity; high places both ports in high-impedance isolation.

It operates within 4.5–5.5 V supply range and supports ±128 mA continuous channel current. Input clamp current is rated at –50 mA, and thermal resistance (θ_JA) is 63°C/W for the DB package - critical for thermal management in compact industrial or telecom backplane designs.

Key Specifications

Parameter	Value and Actual Design Meaning
On-state resistance (r_on)	5–7 Ω at V_CC = 4.5 V - ensures minimal voltage drop and signal integrity during high-speed data transfer.
Propagation delay (t_pd)	0.35 ns typical - enables sub-nanosecond timing in high-throughput bus switching applications.
Enable time (t_en)	2.6–10 ns - defines minimum latency when activating the switch path from OE assertion.
Supply voltage (V_CC)	4.5–5.5 V - compatible with standard 5-V systems while supporting tight regulation margins.
Operating temperature	–40°C to +85°C - qualified for industrial-grade embedded and communications equipment.
Input compatibility	TTL-level (V_IL ≤ 0.8 V, V_IH ≥ 2 V) - interoperable with legacy 5-V logic without external level translators.
Level-shifting capability	5-V input → 3.3-V output via integrated V_CC-clamping diode - eliminates need for discrete translation circuitry.

Pinout & Package

SN74CBTD3861DBR uses a 24-pin SSOP (Shrink Small-Outline Package) with 0.65 mm pitch, 7.9 mm × 4.5 mm body size, and 1.2 mm max height per JEDEC MO-153. Pin 1 index is located at top-left corner with quadrants assigned Q1 per tape-and-reel orientation.

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	Port A input/output terminals - connect to upstream 5-V logic domain or controller side of bus.
12	GND	Power ground reference - requires low-inductance connection to system ground plane for noise immunity.
13	V_CC	5-V supply input - powers internal switch FETs and clamping diodes; bypass with 0.1 µF ceramic capacitor.
14	OE	Active-low output-enable - drives low to connect A↔B; high to isolate both ports into high-Z state.
15–23	B1–B10	Port B input/output terminals - interface to downstream 3.3-V logic, memory, or peripheral side of bus.

Key Features

Feature	Design Value
Integrated level-shifting diode	Enables direct 5-V-to-3.3-V translation without external components - reduces BOM count and board area.
Low on-resistance (5–7 Ω)	Minimizes insertion loss and maintains signal edge fidelity in high-speed parallel buses up to 100 MHz.
TTL-compatible control inputs	Eliminates need for additional logic buffers when driven by standard 5-V microcontrollers or FPGAs.
Single OE control for all 10 bits	Simplifies timing-critical enable sequencing - avoids skew between channels in synchronous data transfers.
High-impedance isolation when disabled	Prevents signal contention and leakage current between disconnected bus segments - essential for hot-swap and power-gating use cases.

Applications

Memory Interface Translation	Industrial Backplane Interconnect
Use Scenario: Connecting a 5-V FPGA memory controller to a 3.3-V SDRAM module in an industrial PLC. IC Role / Device Role / Timing Role: Bidirectional level-shifting bus switch managing address/data/control lines with sub-ns timing alignment. Use Value: Eliminates discrete level translators per line, reduces interconnect capacitance, and preserves setup/hold timing margins under varying load conditions.	Use Scenario: Isolating legacy 5-V I/O modules from modern 3.3-V processing units on a modular automation backplane. IC Role / Device Role / Timing Role: Hot-swap-capable bus gate that enables/disables communication paths without disrupting adjacent slots. Use Value: Prevents bus contention during module insertion/removal and supports deterministic reset sequencing via OE control.
Telecom Line Card Voltage Bridging	Test Equipment Signal Routing
Use Scenario: Bridging 5-V ASIC configuration signals to 3.3-V PHY transceivers on a multi-rate optical line card. IC Role / Device Role / Timing Role: Low-latency, low-distortion signal conduit with integrated voltage translation for control-plane signaling. Use Value: Maintains signal integrity across mixed-supply domains while meeting <1 ns jitter budget for clock-sensitive register writes.	Use Scenario: Reconfigurable signal path selection in automated test equipment handling both 5-V and 3.3-V DUTs. IC Role / Device Role / Timing Role: Programmable bus switch controlled by test sequencer to route stimulus/response signals between voltage domains. Use Value: Enables single-instrument support for dual-voltage DUT families without hardware rework or adapter boards.

Memory Interface Translation

Industrial Backplane Interconnect

Use Scenario: Connecting a 5-V FPGA memory controller to a 3.3-V SDRAM module in an industrial PLC.

IC Role / Device Role / Timing Role: Bidirectional level-shifting bus switch managing address/data/control lines with sub-ns timing alignment.

Use Value: Eliminates discrete level translators per line, reduces interconnect capacitance, and preserves setup/hold timing margins under varying load conditions.

Use Scenario: Isolating legacy 5-V I/O modules from modern 3.3-V processing units on a modular automation backplane.

IC Role / Device Role / Timing Role: Hot-swap-capable bus gate that enables/disables communication paths without disrupting adjacent slots.

Use Value: Prevents bus contention during module insertion/removal and supports deterministic reset sequencing via OE control.

Telecom Line Card Voltage Bridging

Test Equipment Signal Routing

Use Scenario: Bridging 5-V ASIC configuration signals to 3.3-V PHY transceivers on a multi-rate optical line card.

IC Role / Device Role / Timing Role: Low-latency, low-distortion signal conduit with integrated voltage translation for control-plane signaling.

Use Value: Maintains signal integrity across mixed-supply domains while meeting <1 ns jitter budget for clock-sensitive register writes.

Use Scenario: Reconfigurable signal path selection in automated test equipment handling both 5-V and 3.3-V DUTs.

IC Role / Device Role / Timing Role: Programmable bus switch controlled by test sequencer to route stimulus/response signals between voltage domains.

Use Value: Enables single-instrument support for dual-voltage DUT families without hardware rework or adapter boards.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3861DBR	Lacks integrated level-shifting diode; requires external biasing for 5-V-to-3.3-V operation.	Used only in same-voltage-domain switching; unsuitable for mixed-voltage translation without added components.	Select when cost sensitivity outweighs level-shifting requirement and external diodes are acceptable.
SN74LVC1G3157DCKR	Single-channel SPDT analog switch; 5-V tolerant inputs but no built-in 5→3.3 V translation path.	Applicable only for point-to-point signal routing, not 10-bit parallel bus applications.	Choose for low-pin-count, low-current analog signal switching where bus-wide coordination is unnecessary.

Compared with SN74CBTD3861DBR, SN74CBT3861DBR removes level-shifting capability - increasing design complexity in mixed-voltage systems - while SN74LVC1G3157DCKR offers no parallel bus functionality, limiting scalability in data-path applications requiring simultaneous multi-bit control.

Availability

SN74CBTD3861DBR is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74CBTD3861DBR 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 digital signal technologies with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74CBTD3861 belongs to TI's 74CBT family of high-speed CMOS bus switches, engineered specifically for low-latency, low-distortion signal routing in mixed-voltage digital systems.

FAQ

What is the maximum continuous current rating per channel for SN74CBTD3861DBR?

The SN74CBTD3861DBR supports up to 128 mA continuous channel current per switched path. This rating applies under recommended operating conditions (V_CC = 4.5–5.5 V, T_A = –40°C to +85°C) and ensures reliable conduction without thermal derating in typical industrial layouts with adequate copper pour.

Does SN74CBTD3861DBR require external pull-up resistors on its control inputs?

No - SN74CBTD3861DBR has TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2 V) and does not require external pull-ups on OE. However, TI recommends holding all unused control inputs at V_CC or GND to prevent floating states that may cause increased ICC or erratic switching behavior.

Can SN74CBTD3861DBR be used for 3.3-V-to-5-V level shifting?

No - SN74CBTD3861DBR integrates a diode from each A-terminal to V_CC, enabling only 5-V-to-3.3-V translation. Driving B-side inputs with 3.3-V signals while powering V_CC at 5 V does not produce valid 5-V outputs; reverse translation requires separate circuitry or a different device such as the SN74AVC4T245.

What is the thermal resistance (θ_JA) of SN74CBTD3861DBR in its SSOP-24 package?

The SN74CBTD3861DBR in the DB package has a specified junction-to-ambient thermal resistance (θ_JA) of 63°C/W under standard JEDEC test conditions. This value assumes a two-layer PCB with 1 in² copper pad per side and is critical for calculating junction temperature rise under worst-case 128 mA channel loading.

Is SN74CBTD3861DBR pin-compatible with other packages in the same family?

Yes - SN74CBTD3861DBR shares identical pinout and signal mapping with SN74CBTD3861DWR (SOIC-24), SN74CBTD3861PWR (TSSOP-24), and SN74CBTD3861DGVR (TVSOP-24). All variants maintain consistent A1–A10, B1–B10, OE, V_CC, GND, and NC assignments, enabling drop-in replacement across package types without PCB redesign.

SN74CBTD3861DBR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBTD

Package/Case:: 24-SSOP (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

SN74CBTD3861DBR FAQ

1.How can I place an order for SN74CBTD3861DBR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CBTD3861DBR 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 SN74CBTD3861DBR reliable?

The price and inventory of SN74CBTD3861DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD3861DBR is usually 5 days.

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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTD3861DBR transactions.

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4.How is shipping managed for SN74CBTD3861DBR?

SN74CBTD3861DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CBTD3861DBR 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 SN74CBTD3861DBR?

For technical support, including SN74CBTD3861DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD3861DBR requirements.

6.How does Aetrix verify that SN74CBTD3861DBR is sourced from the original manufacturer or authorized distributors?

All SN74CBTD3861DBR 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 SN74CBTD3861DBR meets industry standards.

7.What is the process for return or replacement of SN74CBTD3861DBR?

All SN74CBTD3861DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD3861DBR, 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 SN74CBTD3861DBR part is unused and in its original packaging.

Return procedure for SN74CBTD3861DBR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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