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Texas Instruments SN74CBT16245DLR
- Part No.:
- SN74CBT16245DLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16245DLR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,952
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Product details
Overview
SN74CBT16245DLR from Texas Instruments is a 16-bit FET bus switch organized as two independent 8-bit bidirectional switches, featuring 5-Ω typical on-state resistance, TTL-compatible control inputs (VIH = 2 V, VIL = 0.8 V), and operation over –40°C to 85°C - used in high-speed data path isolation for memory expansion and peripheral multiplexing in industrial control backplanes.
For engineers reviewing the SN74CBT16245DLR datasheet, SN74CBT16245DLR pinout, SN74CBT16245DLR application, or SN74CBT16245DLR equivalent, key selection criteria include bidirectional low-impedance switching, OE-controlled port isolation, ±100 mA latch-up immunity, and SSOP-48 package compatibility with legacy '16245 layouts.
Technical Context
This device implements dual 8-bit CMOS FET transmission gates with separate OE controls per bank, enabling independent enable/disable of A↔B signal paths without directionality constraints. Its architecture eliminates propagation delay accumulation by avoiding internal logic gates - signal passes directly through low-RON channels.
Each switch operates with rail-to-rail voltage handling (–0.5 V to 7 V), supports hot-swap-capable high-impedance states when disabled, and maintains <4 ns enable/disable timing (ten/tdis) at 5 V, making it suitable for dynamic bus resource sharing in multi-master systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (rON) | 5 Ω typical at VCC = 4.5 V, enabling minimal voltage drop (<320 mV at 64 mA) and negligible power loss in signal routing. |
| Propagation delay (tpd) | 0.25 ns typical at VCC = 5 V, supporting >1 GHz data rates in short-trace interconnects without timing budget impact. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5-V TTL and mixed-voltage I/O domains without level-shifting. |
| Control input thresholds | VIH = 2 V, VIL = 0.8 V - ensures reliable interfacing with 3.3-V and 5-V microcontrollers and FPGAs. |
| Latch-up immunity | >100 mA per JESD 78 Class II - guarantees robust operation in noisy industrial environments with transient coupling. |
| ESD protection | 2000-V HBM, 200-V MM, 1000-V CDM - reduces need for external TVS diodes in board-level ESD hardening. |
| Operating temperature | –40°C to +85°C - validated for extended use in uncontrolled ambient industrial enclosures and telecom line cards. |
Pinout & Package
SN74CBT16245DLR uses a 48-pin SSOP (Shrink Small-Outline Package) with 0.5-mm pitch, 12.4 mm × 6.1 mm body size, and 1.2-mm max height - compliant with JEDEC MO-153 and optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables respective 8-bit switch banks; high state forces full port isolation with >10⁹ Ω off-resistance. |
| 1A1–1A8, 2A1–2A8 | Port A terminals (Bank 1 & 2) | Bidirectional signal inputs/outputs; electrically identical to B-side pins - no direction assignment required. |
| 1B1–1B8, 2B1–2B8 | Port B terminals (Bank 1 & 2) | Match A-side pin count and function; allows symmetric A↔B data flow without protocol dependency. |
| VCC (Pins 7, 24, 33, 42) | Power supply | Four distributed VCC pins reduce IR drop and improve noise rejection across the 16-bit bus. |
| GND (Pins 4, 11, 20, 29, 38, 45) | Ground reference | Six GND pins provide low-inductance return paths, critical for maintaining signal integrity at sub-nanosecond edge rates. |
| NC (Pins 1, 48) | No internal connection | Unbonded pads - must remain unconnected; no routing or thermal relief required. |
Key Features
| Feature | Design Value |
|---|---|
| Standard '16245-type pinout | Enables drop-in replacement for legacy 74-series bus transceivers without PCB redesign or layout changes. |
| 5-Ω typical on-state resistance | Minimizes insertion loss and reflection in 50-Ω trace environments, preserving signal rise/fall times below 100 ps. |
| TTL-compatible input levels | Eliminates need for external level shifters when interfacing with 3.3-V or 5-V controllers driving OE signals. |
| High-speed enable/disable timing | ten = 5.6 ns, tdis = 7.7 ns at 5 V - supports dynamic bus arbitration cycles under 20 ns total overhead. |
| Robust ESD and latch-up immunity | JESD 22-compliant HBM/MM/CDM ratings and JESD 78 Class II latch-up tolerance ensure field reliability in handling and operation. |
Applications
| Memory Expansion Interface | Peripheral Multiplexing |
|---|---|
|
Use Scenario: Isolating multiple SRAM or Flash devices on a shared data bus in a programmable logic controller (PLC) CPU module. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-multiplexed access to up to four memory banks using OE strobes synchronized to address decode. Use Value: Eliminates contention during bank switching while maintaining sub-ns signal fidelity - avoids bus turnaround delays inherent in tri-state transceivers. |
Use Scenario: Sharing a single UART or SPI interface among multiple sensors (e.g., temperature, pressure, current) in an industrial gateway. IC Role / Device Role / Timing Role: Low-latency analog/digital signal path selector that routes sensor data to host MCU only when requested, reducing cross-talk and standby current. Use Value: 5-Ω RON preserves signal integrity across 10-cm traces; OE-controlled isolation prevents phantom reads during sensor polling intervals. |
| Backplane Signal Routing | Hot-Swappable Module Interface |
|
Use Scenario: Interconnecting processor and FPGA modules across a 10-layer backplane in test equipment with modular I/O slots. IC Role / Device Role / Timing Role: High-bandwidth, low-skew data bridge between mismatched voltage domains (3.3-V FPGA ↔ 5-V legacy ASIC). Use Value: Rail-to-rail voltage support (–0.5 V to 7 V) tolerates overshoot from long traces; 0.25-ns tpd avoids timing closure issues at 100-MHz bus clocks. |
Use Scenario: Enabling safe insertion/removal of daughter cards in a telecom line card chassis without powering down the main system. IC Role / Device Role / Timing Role: Hot-swap buffer that isolates live backplane signals until mechanical insertion completes and firmware asserts OE. Use Value: High-impedance off-state prevents backfeeding; latch-up immunity (>100 mA) withstands contact bounce transients during mating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16245DLR | Includes series resistors (~25 Ω) integrated into each signal path to dampen ringing - higher rON (30 Ω typ) and reduced bandwidth. | Better suited for longer traces (>15 cm) or unterminated buses where signal integrity dominates over speed. | Select SN74CBTD16245DLR only if measured eye diagrams show overshoot/undershoot exceeding 15% without external termination. |
| 74LVC16245ADGG | CMOS-based 16-bit transceiver with direction control (DIR), not bidirectional FET switch; 3.3-V only, 32 mA drive, higher propagation delay (5.5 ns). | Requires explicit direction management and level-shifting for 5-V systems; unsuitable for true bidirectional passive routing. | Choose 74LVC16245ADGG only when direction logic is already implemented in system firmware and 5-V compatibility is not required. |
Compared with SN74CBT16245DLR, SN74CBTD16245DLR trades speed for signal integrity on marginal interconnects, while 74LVC16245ADGG introduces direction control complexity and voltage limitations - SN74CBT16245DLR remains optimal for low-latency, voltage-flexible, bidirectional isolation in 5-V industrial backplanes.
Availability
SN74CBT16245DLR is available at Aetrix Electronics and suitable for memory expansion interfaces, peripheral multiplexing, backplane signal routing, and hot-swappable module interfaces requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CBT16245DLR 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 experience in high-reliability industrial and automotive IC design.
The SN74CBT16245DLR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, bidirectional signal routing in industrial control, test equipment, and communications infrastructure where timing predictability and voltage flexibility are critical.
FAQ
What is the maximum continuous current rating per channel for the SN74CBT16245DLR?
The SN74CBT16245DLR supports a continuous channel current of 128 mA per switch path, verified under recommended operating conditions (VCC = 4 V to 5.5 V, TA = –40°C to 85°C). This rating ensures reliable operation in high-drive applications such as driving terminated transmission lines or multiple CMOS inputs without thermal derating in standard SSOP airflow conditions.
Does the SN74CBT16245DLR require external pull-up or pull-down resistors on its OE inputs?
No, the SN74CBT16245DLR does not require external biasing on OE inputs. Its TTL-compatible thresholds (VIH = 2 V min, VIL = 0.8 V max) allow direct connection to 3.3-V or 5-V GPIO outputs. However, TI recommends tying unused OE inputs to VCC or GND - not left floating - to prevent metastability and excessive ICC current, per Application Report SCBA004.
Can the SN74CBT16245DLR be used in hot-swap applications?
Yes, the SN74CBT16245DLR is suitable for hot-swap applications due to its high-impedance off-state (>10⁹ Ω), rail-to-rail input/output voltage tolerance (–0.5 V to 7 V), and Class II latch-up immunity (>100 mA). When OE is held high during connector mating, the device blocks backfeeding and withstands contact bounce transients without latch-up or damage.
What is the thermal resistance (θJA) of the SN74CBT16245DLR in its SSOP-48 package?
The SN74CBT16245DLR in the DL (SSOP-48) package has a specified junction-to-ambient thermal resistance (θJA) of 63°C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad with two internal layers and is used to calculate junction temperature rise (TJ = TA + (θJA × PD)) for reliability validation in sustained 128-mA per-channel operation.
Is the SN74CBT16245DLR pin-compatible with the original 74LS16245?
Yes, the SN74CBT16245DLR uses the standard '16245-type pinout defined in TI's Widebus™ documentation and matches the pin-for-pin assignment of 74LS16245, including identical A/B port mapping, OE placement, and VCC/GND distribution - enabling direct replacement without PCB modification, though voltage and timing behavior differ significantly.
SN74CBT16245DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
SN74CBT16245DLR FAQ
1.How can I place an order for SN74CBT16245DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16245DLR 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 SN74CBT16245DLR reliable?
The price and inventory of SN74CBT16245DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16245DLR is usually 5 days.
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SN74CBT16245DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16245DLR 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 SN74CBT16245DLR?
For technical support, including SN74CBT16245DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16245DLR requirements.
6.How does Aetrix verify that SN74CBT16245DLR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16245DLR 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 SN74CBT16245DLR meets industry standards.
7.What is the process for return or replacement of SN74CBT16245DLR?
All SN74CBT16245DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16245DLR, 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 SN74CBT16245DLR part is unused and in its original packaging.
Return procedure for SN74CBT16245DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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