My Inquiry
My Account
Texas Instruments SN74CBT16245DL
- Part No.:
- SN74CBT16245DL
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16245DL.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,469
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74CBT16245DL from Texas Instruments is a 16-bit FET bus switch in SSOP-48 package, providing bidirectional, low-impedance (5 Ω typical) signal routing between A and B ports with TTL-compatible control inputs. It features dual 8-bit switches, independent OE control per group, and supports hot-swap-capable isolation in data path applications such as memory expansion and backplane interconnects.
For engineers reviewing the SN74CBT16245DL datasheet, SN74CBT16245DL pinout, SN74CBT16245DL application, or SN74CBT16245DL equivalent, key selection criteria include on-resistance stability across VCC (4–5.5 V), sub-1 ns propagation delay, high-impedance isolation during disable, latch-up immunity (>100 mA), and ESD robustness (2000-V HBM).
Technical Context
The SN74CBT16245DL implements two independent 8-bit FET-based analog switches, each controlled by a dedicated OE input. Its CMOS-driven pass-gate architecture enables rail-to-rail signal transmission without level translation, supporting bidirectional data flow with no direction pin required.
Each switch exhibits 5–7 Ω on-state resistance at VCC = 4.5 V and II = 30 mA, with propagation delay under 0.35 ns (VCC = 4 V) and enable/disable times below 8 ns. The device operates over –40°C to 85°C and meets JESD 78 Class II latch-up and JESD 22 ESD specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, enabling minimal voltage drop and signal distortion in high-speed digital paths. |
| Propagation delay (tpd) | 0.35 ns max at VCC = 4 V, supporting >1 GHz effective switching in short trace interconnects. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5-V TTL and mixed-voltage system interfaces. |
| Input voltage range (VI) | –0.5 V to 7 V - allows safe operation with overshoot/undershoot transients common in bus environments. |
| Latch-up immunity | >100 mA per JESD 78 Class II - ensures robustness against accidental current injection during hot insertion. |
| ESD protection | 2000-V HBM, 200-V MM, 1000-V CDM - eliminates need for external transient suppression in board-level I/O protection. |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment deployment. |
Pinout & Package
SN74CBT16245DL uses a 48-pin SSOP (Shrink Small-Outline Package) with 0.5-mm pitch, JEDEC MO-153 compliant, body dimensions 12.6 mm × 6.2 mm × 1.95 mm max height, and moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables respective 8-bit switch groups; high state isolates A/B ports with >10⁹ Ω off-isolation. |
| 1A1–1A8, 2A1–2A8 | Port A terminals (Group 1 & 2) | Input/output nodes for first and second 8-bit data lanes; bidirectional with no internal direction logic. |
| 1B1–1B8, 2B1–2B8 | Port B terminals (Group 1 & 2) | Paired counterparts to A-port pins; identical electrical behavior and interchangeable signal routing endpoints. |
| VCC (Pins 7, 18, 29, 40) | Power supply | Four distributed VCC pins minimize IR drop and improve noise rejection across high-frequency switching paths. |
| GND (Pins 4, 11, 22, 33, 44) | Ground reference | Five 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 | Direct mechanical and functional replacement for legacy 74-series bus transceivers without PCB redesign. |
| 5-Ω switch on-resistance | Enables <10 mV voltage drop at 20 mA, preserving logic margins in 5-V TTL and LVTTL systems. |
| TTL-compatible input levels | Accepts VIH ≥ 2 V and VIL ≤ 0.8 V - interoperable with standard 5-V microcontrollers and FPGAs without level shifters. |
| High-impedance isolation | Off-state leakage <±1 µA ensures signal integrity when multiple devices share a common bus segment. |
| Hot-swap capable | No power sequencing required; device withstands live insertion due to undervoltage lockout-free architecture. |
Applications
| Memory Expansion Interface | Backplane Data Routing |
|---|---|
Use Scenario: Adding SRAM or Flash memory banks to an MCU-based controller where address/data bus width must be extended without increasing drive load. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating auxiliary memory from main bus during idle cycles to reduce capacitive loading and timing skew. Use Value: Maintains tACC and tCO specifications by limiting switched capacitance to only active memory segments. |
Use Scenario: Interconnecting modular line cards in telecom chassis where signals traverse midplane connectors with variable trace lengths. IC Role / Device Role / Timing Role: Signal path selector enabling dynamic reconfiguration of data lanes between slots while preserving signal integrity. Use Value: Sub-1 ns tpd prevents added jitter accumulation across multi-stage backplane topologies. |
| Hot-Swappable I/O Module | FPGA Configuration Bus Isolation |
Use Scenario: Industrial PLC I/O modules that support field replacement without powering down the main controller. IC Role / Device Role / Timing Role: Bus gate preventing backfeeding and ground bounce during module insertion/removal events. Use Value: Latch-up immunity >100 mA and 2000-V HBM ESD rating eliminate need for external protection diodes or TVS arrays. |
Use Scenario: Isolating FPGA configuration memory (e.g., SPI Flash) from user logic during partial reconfiguration sequences. IC Role / Device Role / Timing Role: Controlled disconnect of configuration bus to prevent corruption during bitstream reload. Use Value: Independent OE control per 8-bit group allows selective isolation of clock/data lines without disrupting active logic domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16245DL | Includes series resistors (26 Ω) on all I/O pins for improved EMI suppression and reduced ringing. | Better suited for longer traces (>10 cm) or noisy industrial environments where signal integrity dominates over raw speed. | Select SN74CBTD16245DL when trace length or EMC compliance drives design, not SN74CBT16245DL's pure low-Ron advantage. |
| SN74LVC16245ADGGR | CMOS transceiver (not FET switch); 3.3-V only, higher output drive (24 mA), but 3× higher propagation delay (~3 ns). | Applicable where voltage translation (3.3 V ↔ 5 V) or bus driving strength matters more than ultra-low latency. | Choose SN74LVC16245ADGGR for 3.3-V systems requiring level-shifting capability; avoid for sub-1 ns timing-critical paths. |
Compared with SN74CBT16245DL, SN74CBTD16245DL trades 5 Ω Ron for integrated termination, while SN74LVC16245ADGGR replaces passive switching with active buffering-making SN74CBT16245DL optimal for minimal-delay, 5-V-only, high-isolation bus gating.
Availability
SN74CBT16245DL is available at Aetrix Electronics and suitable for memory expansion interfaces, backplane data routing, hot-swappable I/O modules, FPGA configuration bus isolation, and industrial control bus segmentation requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CBT16245DL 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and industrial-grade qualification.
The SN74CBT16245DL belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for low-latency, bidirectional signal routing in 5-V digital systems where timing predictability and bus isolation are critical.
FAQ
What is the maximum operating frequency supported by the SN74CBT16245DL?
The SN74CBT16245DL does not specify a maximum clock frequency because it is an analog switch, not a synchronous device. Its usable bandwidth is determined by RC time constant: with 5 Ω Ron and typical 5 pF load, it supports clean signal transmission up to ~3 GHz. Real-world limits depend on PCB layout, trace impedance, and source/load capacitance - verified via tpd = 0.35 ns at VCC = 4 V in the SN74CBT16245DL datasheet.
Can the SN74CBT16245DL be used for level translation between 3.3 V and 5 V logic?
No, the SN74CBT16245DL is not a level translator. It is a passive FET switch that passes signals within its VCC-supplied voltage range (4–5.5 V). Applying 3.3 V signals to the A or B port while VCC = 5 V is allowed per absolute max ratings (VI = –0.5 to 7 V), but the output swing remains rail-limited to VCC/GND - no voltage conversion occurs. For true 3.3 V ↔ 5 V translation, use dedicated level-shifting ICs like SN74AVC16T245 instead of SN74CBT16245DL.
Is the SN74CBT16245DL pin-compatible with older 74LS16245 or 74ACT16245 devices?
Yes, the SN74CBT16245DL uses the standard '16245-type pinout defined in TI's Widebus™ family documentation. Pin functions (A/B ports, OE, VCC, GND) align exactly with 74LS16245 and 74ACT16245, enabling drop-in replacement in existing layouts. However, note differences in electrical behavior: SN74CBT16245DL has no direction pin, bidirectional operation, lower Ron, and faster timing - verify timing closure and loading effects before substitution.
Does the SN74CBT16245DL require pull-up or pull-down resistors on its OE inputs?
Yes - all unused control inputs, including OE pins, must be held at a valid logic level (VCC or GND) to ensure predictable operation. Floating OE inputs can cause partial turn-on of internal FETs, leading to increased ICC, bus contention, or undefined states. TI recommends tying unused OE inputs directly to VCC (for permanent enable) or GND (for permanent disable) - do not leave them open. This requirement is explicitly stated in the SN74CBT16245DL recommended operating conditions.
What is the thermal performance of the SN74CBT16245DL in its SSOP-48 package?
The SN74CBT16245DL in DL (SSOP-48) package has a junction-to-ambient thermal resistance (θJA) of 63°C/W, measured per JESD 51-7 on a standard 4-layer test board. With maximum continuous channel current of 128 mA and typical Ron of 5 Ω, worst-case power dissipation per switch is ~8.2 mW - resulting in negligible junction temperature rise (<1°C) under normal operation. No heatsinking is required for typical bus-switching duty cycles.
SN74CBT16245DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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
SN74CBT16245DL FAQ
1.How can I place an order for SN74CBT16245DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16245DL 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 SN74CBT16245DL reliable?
The price and inventory of SN74CBT16245DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16245DL is usually 5 days.
3.What payment methods are accepted for SN74CBT16245DL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT16245DL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT16245DL?
SN74CBT16245DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16245DL 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 SN74CBT16245DL?
For technical support, including SN74CBT16245DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16245DL requirements.
6.How does Aetrix verify that SN74CBT16245DL is sourced from the original manufacturer or authorized distributors?
All SN74CBT16245DL 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 SN74CBT16245DL meets industry standards.
7.What is the process for return or replacement of SN74CBT16245DL?
All SN74CBT16245DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16245DL, 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 SN74CBT16245DL part is unused and in its original packaging.
Return procedure for SN74CBT16245DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74CBT16245DL Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
