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

Texas Instruments SN74CBTK16245DLR

Name: SN74CBTK16245DLR
Brand: Texas Instruments
SKU: SN74CBTK16245DLR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CBTK16245DLR

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 48-BSSOP (0.295", 7.50mm Width)

Datasheet:: SN74CBTK16245DLR.pdf

Description:: IC BUS SWITCH 8 X 1:1 48SSOP

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Product details

Overview

SN74CBTK16245DLR from Texas Instruments is a 16-bit FET bus switch with active-clamp undershoot protection, designed for high-speed TTL-compatible bidirectional data routing in memory and peripheral interfaces. It features 5-Ω on-state resistance, I_off partial-power-down support, and clamps I/O undershoots to –2 V. Used in hot-swap-capable backplane and modular computing systems where signal integrity under transient stress is critical.

For engineers reviewing the SN74CBTK16245DLR datasheet, SN74CBTK16245DLR pinout, SN74CBTK16245DLR application, or SN74CBTK16245DLR equivalent, key selection criteria include its 48-pin SSOP package, dual 8-bit independent enable control, active undershoot clamp architecture, and guaranteed operation from –40°C to 85°C with 4–5.5 V supply.

Technical Context

This device implements two independent 8-bit low-impedance FET switches, each controlled by dedicated OE inputs (1OE and 2OE), enabling selective isolation of A↔B data paths without affecting adjacent channels. Its active-clamp circuit supplies current from V_CC to limit I/O undershoot to –2 V, preventing pass-transistor turn-on during negative transients.

The switch supports partial-power-down via I_off circuitry that disables outputs when V_CC = 0 V, blocking reverse current flow up to ±20 µA per I/O. Propagation delay is 0.25 ns (typ) at V_CC = 5 V, and on-resistance remains ≤7 Ω across full operating voltage and temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
On-state resistance (r_on)	5 Ω (min) to 7 Ω (max) at V_CC = 4.5 V - ensures minimal voltage drop and signal distortion during data transfer.
Propagation delay (t_pd)	0.25 ns (typ) at V_CC = 5 V - enables sub-nanosecond timing-critical bus switching in high-speed digital systems.
Undershoot clamp threshold	–2 V (max) - actively limits I/O negative excursions to prevent latch-up and false triggering in noisy environments.
I_off leakage current	20 µA (max) at V_CC = 0 V - guarantees safe hot-insertion and system-level power sequencing compliance.
Supply voltage range	4 V to 5.5 V - compatible with standard 5-V TTL and mixed-voltage logic domains without level-shifting.
Operating temperature	–40°C to +85°C - qualified for industrial-grade embedded and communications equipment deployment.
ESD protection	2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for robust board-level handling and field reliability.

Pinout & Package

SN74CBTK16245DLR uses a 48-pin SSOP (Shrink Small-Outline Package) with 0.635-mm lead pitch, 11.35 mm × 16.2 mm body dimensions, and RoHS-compliant green finish (CU NIPDAU). The package meets JEDEC MO-153 and is rated MSL Level-1 (260°C peak reflow).

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Independent output-enable inputs	Active-low control per 8-bit bank - enables granular bus segmentation and power-gating of A↔B paths.
1A1–1A8, 2A1–2A8	Port A input/output terminals	First and second 8-bit data lanes - bidirectionally connected to B ports when corresponding OE is low.
1B1–1B8, 2B1–2B8	Port B input/output terminals	Complementary 8-bit lanes - electrically identical to A ports; no directionality enforced by internal FET structure.
V_CC (Pins 7, 18, 25, 36)	Power supply	Four distributed V_CC pins reduce IR drop and improve noise immunity across the 16-bit switch array.
GND (Pins 4, 11, 22, 29, 42)	Ground reference	Five GND pins provide low-inductance return paths and stabilize undershoot clamp operation.
NC (Pins 1, 48)	No internal connection	Reserved for mechanical symmetry - must remain unconnected to avoid parasitic coupling or thermal stress.

Key Features

Feature	Design Value
Active-clamp undershoot protection	Clamps I/O to –2 V using V_CC-sourced current - eliminates need for external Schottky diodes in transient-prone interconnects.
Dual independent 8-bit banks	Separate 1OE/2OE controls allow asymmetric enable timing and independent power management per data segment.
TTL-compatible input thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2 V - ensures direct interfacing with legacy 5-V microcontrollers and ASICs without level shifters.
Low on-state capacitance	C_io(OFF) = 5.5 pF - minimizes capacitive loading on driven buses, preserving signal edge rates above 1 GHz.
Latch-up immunity	Exceeds 100 mA per JESD 78 Class II - guarantees robustness against accidental ground-bounce or supply collapse events.

Applications

Hot-Swap Backplane Interface	Memory Expansion Module
Use Scenario: Inserting/removing PCIe or CompactPCI modules while system remains powered. IC Role / Device Role / Timing Role: Bidirectional signal isolator between motherboard and add-in card, enabling safe live insertion with undershoot suppression. Use Value: Prevents –2 V undershoot-induced false reads or bus contention during connector mating, maintaining data coherency without firmware intervention.	Use Scenario: Adding DDR2 SODIMM modules to industrial PC mainboards with shared address/data buses. IC Role / Device Role / Timing Role: Low-latency bus switch enabling dynamic memory mapping and isolation of inactive DIMM slots. Use Value: 0.25 ns propagation delay preserves timing margins for 400 MT/s DDR2 transfers; 5-Ω r_on avoids signal degradation across 16-bit parallel paths.
Modular Test Equipment Bus	Legacy Peripheral Bridge
Use Scenario: Reconfigurable signal routing in automated test equipment (ATE) racks with interchangeable instrument cards. IC Role / Device Role / Timing Role: High-speed multiplexer for GPIB, VXI, or PXI bus segments requiring nanosecond-level path selection. Use Value: Dual OE control allows synchronized switching of two 8-bit lanes, supporting parallel test vector injection with <1 ns skew between lanes.	Use Scenario: Interfacing ISA-bus peripherals (e.g., data acquisition cards) to modern x86-based controllers via FPGA glue logic. IC Role / Device Role / Timing Role: Level-tolerant bus buffer translating between 5-V ISA signals and 3.3-V FPGA I/O banks. Use Value: I_off protection prevents backfeed from powered ISA slots into unpowered FPGA sections during partial system resets.

Hot-Swap Backplane Interface

Memory Expansion Module

Use Scenario: Inserting/removing PCIe or CompactPCI modules while system remains powered.

IC Role / Device Role / Timing Role: Bidirectional signal isolator between motherboard and add-in card, enabling safe live insertion with undershoot suppression.

Use Value: Prevents –2 V undershoot-induced false reads or bus contention during connector mating, maintaining data coherency without firmware intervention.

Use Scenario: Adding DDR2 SODIMM modules to industrial PC mainboards with shared address/data buses.

IC Role / Device Role / Timing Role: Low-latency bus switch enabling dynamic memory mapping and isolation of inactive DIMM slots.

Use Value: 0.25 ns propagation delay preserves timing margins for 400 MT/s DDR2 transfers; 5-Ω r_on avoids signal degradation across 16-bit parallel paths.

Modular Test Equipment Bus

Legacy Peripheral Bridge

Use Scenario: Reconfigurable signal routing in automated test equipment (ATE) racks with interchangeable instrument cards.

IC Role / Device Role / Timing Role: High-speed multiplexer for GPIB, VXI, or PXI bus segments requiring nanosecond-level path selection.

Use Value: Dual OE control allows synchronized switching of two 8-bit lanes, supporting parallel test vector injection with <1 ns skew between lanes.

Use Scenario: Interfacing ISA-bus peripherals (e.g., data acquisition cards) to modern x86-based controllers via FPGA glue logic.

IC Role / Device Role / Timing Role: Level-tolerant bus buffer translating between 5-V ISA signals and 3.3-V FPGA I/O banks.

Use Value: I_off protection prevents backfeed from powered ISA slots into unpowered FPGA sections during partial system resets.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT16245DLR	Lacks active-clamp undershoot protection; max undershoot tolerance –0.5 V only; otherwise identical pinout, r_on, and timing.	Suitable only in benign ESD/EMI environments without hot-swap or cable-disconnect transients.	Select SN74CBT16245DLR only if undershoot events are absent and cost reduction is prioritized over robustness.
SN74LVC16245ADLR	CMOS-based, 3.3-V only (1.65–3.6 V); higher r_on (18 Ω typ); no undershoot clamp; supports I_off but not active clamping.	Restricted to 3.3-V systems; requires level-shifting for 5-V legacy interfaces; unsuitable for hot-swap or noisy industrial settings.	Choose SN74LVC16245ADLR only for new 3.3-V designs where ultra-low static power (<1 µA ICC) outweighs transient resilience needs.

Compared with SN74CBT16245DLR and SN74LVC16245ADLR, the SN74CBTK16245DLR uniquely delivers –2 V active undershoot clamping within a 5-V TTL-compatible footprint-making it the sole option for industrial hot-swap and legacy bus bridging where transient immunity is non-negotiable.

Availability

SN74CBTK16245DLR is available at Aetrix Electronics and suitable for hot-swap backplane interfaces, memory expansion modules, modular test equipment buses, and legacy peripheral bridges requiring stable component supply across extended lifecycle deployments.

Supply support for SN74CBTK16245DLR 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 logic solutions, with decades of innovation in high-reliability interface ICs.

The SN74CBTK16245DLR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for robust signal routing in industrial, telecom, and computing infrastructure where undershoot resilience and nanosecond timing are essential.

FAQ

What is the maximum undershoot voltage the SN74CBTK16245DLR can safely clamp?

The SN74CBTK16245DLR actively clamps I/O undershoot to –2 V maximum under specified test conditions (V_CC = 5.5 V, I_I = –50 mA). This is achieved via an internal V_CC-sourced clamp circuit that prevents pass-transistor turn-on and maintains signal integrity during connector mating or ESD events. The –2 V limit is guaranteed across the full –40°C to +85°C operating range and is documented in the undershoot characteristics table of the SCDS105D datasheet.

Does the SN74CBTK16245DLR support partial-power-down operation?

Yes, the SN74CBTK16245DLR fully supports partial-power-down via its I_off circuitry. When V_CC = 0 V, the device limits I/O leakage to 20 µA maximum, preventing damaging reverse current flow from live buses into the unpowered IC. This feature is validated per JESD78 Class II latch-up testing and enables safe hot-plug operation in modular systems where subsystems power up/down asynchronously.

What is the on-state resistance specification for SN74CBTK16245DLR at 5 V supply?

At V_CC = 5 V, the SN74CBTK16245DLR has a typical on-state resistance (r_on) of 5 Ω, with a maximum of 7 Ω across all 16 channels. This value is measured at VI = 2.4 V and II = 15 mA, and remains stable over temperature and process variation. The low r_on ensures minimal voltage drop and preserves signal rise/fall times in high-speed parallel bus applications.

Is the SN74CBTK16245DLR pin-compatible with standard '16245 devices?

Yes, the SN74CBTK16245DLR uses the standard '16245-type pinout as confirmed in the device description and top-side marking (CBTK16245). It maintains identical pin assignments for A/B ports, OE controls, V_CC, and GND versus legacy 74-series bus switches, enabling drop-in replacement in existing PCB layouts-provided undershoot protection requirements align with the design intent.

What package type and environmental rating does SN74CBTK16245DLR use?

The SN74CBTK16245DLR is packaged in a 48-pin SSOP (DL package) with green RoHS-compliant finish (CU NIPDAU), rated MSL Level-1 (260°C peak reflow). Its dimensions are 11.35 mm × 16.2 mm × 2.4 mm, and it complies with JEDEC MO-153 mechanical standards. The "R" suffix denotes tape-and-reel packaging with 1000 units per reel, optimized for automated SMT assembly.

SN74CBTK16245DLR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBTK

Package/Case:: 48-BSSOP (0.295", 7.50mm Width)

Packaging:: Bulk

Product Status:: Obsolete

Type:: Bus Switch

Circuit:: 8 x 1:1

Independent Circuits:: 2

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:: 48-SSOP

SN74CBTK16245DLR FAQ

1.How can I place an order for SN74CBTK16245DLR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CBTK16245DLR 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 SN74CBTK16245DLR reliable?

The price and inventory of SN74CBTK16245DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTK16245DLR is usually 5 days.

3.What payment methods are accepted for SN74CBTK16245DLR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTK16245DLR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74CBTK16245DLR?

SN74CBTK16245DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CBTK16245DLR 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 SN74CBTK16245DLR?

For technical support, including SN74CBTK16245DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTK16245DLR requirements.

6.How does Aetrix verify that SN74CBTK16245DLR is sourced from the original manufacturer or authorized distributors?

All SN74CBTK16245DLR 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 SN74CBTK16245DLR meets industry standards.

7.What is the process for return or replacement of SN74CBTK16245DLR?

All SN74CBTK16245DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTK16245DLR, 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 SN74CBTK16245DLR part is unused and in its original packaging.

Return procedure for SN74CBTK16245DLR:

1.Submit a request within 90 days.

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

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