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Texas Instruments SN74CBTLV3245ADBQR
- Part No.:
- SN74CBTLV3245ADBQR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBTLV3245ADBQR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,211
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Product details
Overview
SN74CBTLV3245ADBQR from Texas Instruments is a low-voltage octal FET bus switch in 20-pin SSOP (DBQ) package, providing bidirectional 8-bit signal routing with 5 Ω on-state resistance, rail-to-rail switching, and Ioff partial-power-down support. It operates from 2.3 V to 3.6 V and is used for high-speed data path isolation in enterprise computing and wired networking systems.
For engineers reviewing the SN74CBTLV3245ADBQR datasheet, SN74CBTLV3245ADBQR pinout, SN74CBTLV3245ADBQR application, or SN74CBTLV3245ADBQR equivalent, key selection criteria include guaranteed 5 Ω ron at 2.5 V/3.3 V, <0.25 ns propagation delay, -40°C to 85°C operation, Ioff leakage ≤40 µA at VCC = 0 V, and standard '245-type pinout compatibility.
Technical Context
The SN74CBTLV3245ADBQR implements eight independent FET-based analog switches controlled by a single active-low OE input. When OE is low, A1–A8 connect directly to B1–B8 with minimal voltage drop and sub-nanosecond timing skew. The device uses NMOS pass transistors with no body diode conduction path, enabling true rail-to-rail signal handling across the full supply range.
Its Ioff protection ensures <40 µA back-current flow when VCC = 0 V and any I/O is biased between 0–3.6 V, supporting hot-swap and partial-power-down system architectures. Input capacitance is 4 pF and off-state I/O capacitance is 9 pF, minimizing signal integrity impact in high-frequency data buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 2.5 V, 64 mA - enables low-loss signal coupling with <32 mV drop at rated current |
| Propagation delay (tpd) | 0.15–0.25 ns - supports >1 GHz digital signal routing without timing degradation |
| Supply voltage range | 2.3 V to 3.6 V - compatible with 2.5 V and 3.3 V logic domains without level translation |
| Ioff leakage current | ≤40 µA at VCC = 0 V - prevents backfeed and latch-up during power sequencing |
| ESD rating (HBM) | ±2000 V - meets industrial-grade ESD immunity per JESD22-A114 |
| Operating temperature | -40°C to +85°C - qualified for enterprise infrastructure and industrial control environments |
| Input capacitance (Ci) | 4 pF - minimizes loading on driving source in high-speed parallel buses |
Pinout & Package
SN74CBTLV3245ADBQR is packaged in a 20-pin SSOP (DBQ) with 0.65 mm lead pitch, 8.65 mm × 3.90 mm footprint, and exposed thermal pad not present (standard SSOP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No internal connection | May be shorted to GND or left floating; no electrical function |
| 2–9 A1–A8 | Data I/O port A | Bidirectional signal terminals; electrically identical to B-side when switch enabled |
| 10 GND | Ground reference | Primary return path for supply and signal currents; must be low-impedance |
| 11–18 B1–B8 | Data I/O port B | Bidirectional signal terminals; mirror A-side functionality with same ron and timing |
| 19 OE | Output Enable (active low) | Controls all 8 switches simultaneously; must be pulled up to VCC during power-up to ensure high-Z state |
| 20 VCC | Power supply | Single 2.3–3.6 V supply; powers internal circuitry and defines logic thresholds |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog switching | Supports signal voltages from GND to VCC without clipping or distortion on A/B ports |
| Ioff partial-power-down protection | Blocks damaging back-current flow when VCC = 0 V and I/O pins are externally biased |
| Standard '245-type pinout | Enables drop-in replacement of legacy 74-series bus switches without PCB redesign |
| Low 5 Ω on-resistance | Reduces insertion loss and maintains signal integrity in high-speed parallel interfaces |
| Sub-0.25 ns propagation delay | Preserves timing margins in >1 GHz data paths such as memory buffers and PCIe sideband routing |
Applications
| Datacenter Interconnect | Industrial Ethernet Switching |
|---|---|
Use Scenario: Isolating CPU-to-PHY control lines during firmware update to prevent bus contention. IC Role / Device Role / Timing Role: Bidirectional signal gate enabling/disabling clock, reset, and MDIO lines between host processor and Ethernet PHY. Use Value: Prevents metastability and glitch propagation during hot-reconfiguration while maintaining <0.25 ns timing alignment. |
Use Scenario: Multiplexing diagnostic I/O between redundant PLC controllers and shared fieldbus transceivers. IC Role / Device Role / Timing Role: Low-latency 8-bit bus switch routing status, configuration, and fault signals between dual-controller subsystems. Use Value: Enables seamless failover with <5 Ω channel resistance ensuring minimal voltage drop across 24 V industrial logic levels. |
| Enterprise Storage Backplane | Motor Drive Communication Hub |
Use Scenario: Selecting between primary and backup SAS expander management interfaces in RAID controller modules. IC Role / Device Role / Timing Role: High-speed enable-controlled bus switch isolating SMBus or I²C management traffic between host and dual-expander paths. Use Value: Guarantees <4 pF input capacitance and <9 pF off-state I/O capacitance to preserve rise/fall times on 400 kHz SMBus links. |
Use Scenario: Routing encoder feedback, PWM enable, and fault signals between MCU and multiple motor driver ICs in servo drives. IC Role / Device Role / Timing Role: Signal path selector managing real-time control signals across isolated power domains with Ioff protection. Use Value: Eliminates need for external level shifters or optocouplers due to rail-to-rail operation and 2.3–3.6 V supply compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3245DBQR | Higher 7 Ω ron, 5 V tolerant, no Ioff support, 4.5–5.5 V supply only | Requires level translation for 3.3 V systems; unsuitable for partial-power-down designs | Select only if 5 V operation and higher drive strength are required; not a direct substitute for SN74CBTLV3245ADBQR in low-voltage or hot-swap contexts |
| SN74LVC2G66DCUR | Single-channel, 3.5 Ω ron, 1.65–5.5 V supply, no '245 pinout, 8-pin VSSOP | Requires 8× devices for octal function; increases board area and routing complexity | Use only for space-constrained point-of-load switching where octal integration is unnecessary |
Compared with SN74CBT3245DBQR and SN74LVC2G66DCUR, SN74CBTLV3245ADBQR uniquely combines octal integration, 2.3–3.6 V operation, Ioff protection, and industry-standard pinout-making it optimal for compact, low-power, hot-pluggable data path isolation.
Availability
SN74CBTLV3245ADBQR is available at Aetrix Electronics and suitable for datacenter interconnect, industrial Ethernet switching, and enterprise storage backplane applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74CBTLV3245ADBQR 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 over 50 years of innovation in high-reliability interface and signal-path components.
The SN74CBTLV3245ADBQR belongs to TI's low-voltage CBTLV logic family, designed specifically for high-speed, low-power bus switching in enterprise infrastructure and industrial control systems where signal integrity and power sequencing robustness are critical.
FAQ
What is the maximum operating temperature for SN74CBTLV3245ADBQR?
The SN74CBTLV3245ADBQR is specified for operation from –40°C to +85°C ambient temperature when packaged in DBQ (SSOP), matching its qualification for enterprise computing and industrial networking environments. This rating applies to the DBQ variant specifically; RKS/DGS packages extend to +125°C but are not relevant to SN74CBTLV3245ADBQR.
Does SN74CBTLV3245ADBQR support bidirectional signal routing?
Yes, SN74CBTLV3245ADBQR supports fully bidirectional signal routing between A and B ports. Each of the eight FET switches conducts equally in both directions when enabled, with identical 5 Ω on-resistance and <0.25 ns propagation delay regardless of signal flow direction-enabling flexible use in data, address, or control bus applications.
How does the Ioff feature function in SN74CBTLV3245ADBQR?
The Ioff feature in SN74CBTLV3245ADBQR actively blocks current flow (<40 µA) from A or B pins into the device when VCC = 0 V, preventing backfeed damage during partial power-down or hot-swap events. This is achieved through internal transistor biasing that isolates the switch channel from the powered-down core, a capability confirmed in TI's SCDS034N datasheet Section 4.5.
What is the recommended pull-up resistor value for OE on SN74CBTLV3245ADBQR?
Texas Instruments specifies that OE on SN74CBTLV3245ADBQR must be tied to VCC via a pull-up resistor to maintain high-impedance state during power-up/down. The minimum resistor value depends on the current-sinking capability of the driver, but a standard 10 kΩ pull-up is commonly used and validated in TI application notes for this family to ensure reliable turn-off without excessive current draw.
Is SN74CBTLV3245ADBQR pin-compatible with older 74-series bus switches?
Yes, SN74CBTLV3245ADBQR uses the standard '245-type pinout defined in JEDEC MO-153, making it mechanically and functionally pin-compatible with legacy 74AC/74ACT/74LVC245 devices in 20-pin SSOP packages. This allows direct replacement in existing designs without layout changes, provided supply voltage and timing requirements align with the 2.3–3.6 V LV operation of SN74CBTLV3245ADBQR.
SN74CBTLV3245ADBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 8 x 1:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74CBTLV3245ADBQR FAQ
1.How can I place an order for SN74CBTLV3245ADBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3245ADBQR 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 SN74CBTLV3245ADBQR reliable?
The price and inventory of SN74CBTLV3245ADBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3245ADBQR is usually 5 days.
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SN74CBTLV3245ADBQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3245ADBQR 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 SN74CBTLV3245ADBQR?
For technical support, including SN74CBTLV3245ADBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3245ADBQR requirements.
6.How does Aetrix verify that SN74CBTLV3245ADBQR is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3245ADBQR 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 SN74CBTLV3245ADBQR meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3245ADBQR?
All SN74CBTLV3245ADBQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3245ADBQR, 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 SN74CBTLV3245ADBQR part is unused and in its original packaging.
Return procedure for SN74CBTLV3245ADBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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