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Texas Instruments SN74CB3T3245PWR
- Part No.:
- SN74CB3T3245PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CB3T3245PWR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,151
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Product details
Overview
SN74CB3T3245PWR from Texas Instruments is an 8-bit FET bus switch with bidirectional data flow, 5Ω typical ON-state resistance, 5V-tolerant I/Os, and VCC-operated voltage translation (2.3V–3.6V). It enables level shifting between 5V TTL and 2.5V/3.3V logic domains in PCI and USB interfaces.
For engineers reviewing the SN74CB3T3245PWR datasheet, SN74CB3T3245PWR pinout, SN74CB3T3245PWR application, or SN74CB3T3245PWR equivalent, this page delivers verified electrical specs, TSSOP-20 package details, mixed-mode signal operation support, and real-world level-shifting use cases - all confirmed against TI's SCDS136E production datasheet (May 2026 revision).
Technical Context
The SN74CB3T3245PWR implements eight independent FET-based transmission gates controlled by a single active-low OE input, supporting true bidirectional signal flow with near-zero propagation delay (0.15 ns at 2.5V, 0.25 ns at 3.3V). Its output voltage tracks VCC, enabling down-translation from 5V inputs to 2.5V or 3.3V outputs depending on supply voltage.
It features Ioff protection for partial-power-down operation, undershoot clamp diodes on all I/O and control pins, and 5V tolerance regardless of VCC state (powered up or down). The device operates across –40°C to +85°C and meets JESD 17 latch-up (>250 mA) and JESD 22 ESD standards (2000V HBM, 1000V CDM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - defines compatible host logic families (2.5V/3.3V systems) and enables mixed-voltage domain interfacing. |
| ron (Typical) | 5Ω at VCC = 2.5V - ensures minimal signal attenuation and preserves edge integrity for high-speed digital buses. |
| Propagation Delay | 0.15 ns (2.5V), 0.25 ns (3.3V) - enables sub-nanosecond timing-critical applications like memory interleaving and PCIe sideband signaling. |
| I/O Voltage Range | 0V to 5.5V - supports 5V-tolerant operation with legacy peripherals while powered at 2.5V or 3.3V, eliminating external level shifters. |
| ICC (Max) | 40 µA - enables ultra-low static power consumption suitable for battery-powered portable equipment and always-on subsystems. |
| Cio(OFF) (Typical) | 5 pF - minimizes capacitive loading on upstream drivers and preserves signal rise/fall times in high-frequency bus isolation. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems including automotive infotainment and industrial PLC backplanes. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 6.4 mm body, 0.65 mm pitch, surface-mount, RoHS-compliant, moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No internal connection | Unused pad - must be left floating or grounded per layout best practices; no electrical function. |
| 2–9 A1–A8 | Data I/O port A | Bidirectional switch input terminals; accept 0–5.5V signals regardless of VCC state. |
| 10 GND | Ground reference | Primary return path for switch current and control logic; requires low-inductance PCB connection. |
| 11–18 B1–B8 | Data I/O port B | Bidirectional switch output terminals; voltage level tracks VCC during translation mode. |
| 19 OE | Active-low enable | Controls all eight switches simultaneously; high = high-impedance isolation, low = ON-state conduction. |
| 20 VCC | Power supply | Supplies gate drive for internal FETs; sets output voltage translation level and defines logic compatibility. |
Key Features
| Feature | Design Value |
|---|---|
| Standard '245-type pinout | Enables drop-in replacement for legacy 74-series bus switches without PCB redesign or footprint change. |
| Output voltage translation tracking VCC | Eliminates need for external resistive dividers or dedicated level translators when interfacing 5V controllers to 2.5V/3.3V peripherals. |
| 5V-tolerant I/Os (powered up/down) | Permits hot-plug capability and safe operation during power sequencing mismatches in multi-rail systems. |
| Ioff partial-power-down support | Prevents damaging back-current flow when VCC is off, enabling safe integration into systems with staggered power domains. |
| Mixed-mode signal operation | Allows simultaneous 5V, 3.3V, and 2.5V signaling on same bus - critical for USB 2.0 transceivers and PCI Express sideband lines. |
Applications
| PCI Interface | USB 2.0 Transceiver Isolation |
|---|---|
|
Use Scenario: Isolating legacy PCI bus segments during hot-swap or power-gating events in industrial motherboards. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling dynamic segmentation of 32-bit address/data lines while maintaining signal integrity. Use Value: Prevents bus contention and reduces ground bounce via 5Ω ron and 5pF OFF-capacitance, meeting PCI SIG timing skew requirements. |
Use Scenario: Level-shifting D+ and D− lines between 5V USB host controller and 3.3V PHY in embedded USB hubs. IC Role / Device Role / Timing Role: Voltage-translating bus switch providing 5V-to-3.3V down-shift with sub-0.25 ns propagation delay. Use Value: Maintains USB 2.0 full-speed (12 Mbps) eye diagram compliance without added jitter or duty-cycle distortion. |
| Memory Interleaving Control | Low-Power Portable Equipment Bus Isolation |
|
Use Scenario: Enabling/disabling parallel flash or SRAM banks in handheld medical devices based on processor access patterns. IC Role / Device Role / Timing Role: Low-latency ON/OFF gate for address/data bus routing between CPU and memory modules. Use Value: Reduces active power by 40 µA standby ICC and eliminates leakage paths during idle cycles via Ioff protection. |
Use Scenario: Isolating display interface (LVDS or RGB) from baseband processor during sleep mode in smartphones and tablets. IC Role / Device Role / Timing Role: Power-aware bus switch decoupling high-speed video data lanes during system suspend. Use Value: Achieves zero current draw from isolated peripherals and prevents wake-up glitches via OE-controlled high-Z state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384PWR | 10-bit, dual-supply (VCCA/VCCB), 3.3V/5V translation; higher ron (7Ω typ), larger TSSOP-24 package. | Supports asymmetric voltage translation (e.g., 3.3V ↔ 5V) but lacks Ioff and 2.5V operation. | Select when bidirectional 3.3V↔5V level shifting is required and 2.5V compatibility is unnecessary. |
| SN74AVC4T245RGYR | 4-bit, dual-supply, auto-direction sensing; lower ron (3.5Ω), supports 1.2V–3.6V VCCA/VCCB; no 5V tolerance. | Requires direction control or auto-sensing; not 5V-tolerant - unsuitable for legacy 5V peripheral interfacing. | Select for compact 4-bit translation in modern low-voltage SoC interconnects where 5V tolerance is irrelevant. |
Compared with SN74CB3T3245PWR, SN74CBTD3384PWR offers dual-supply flexibility but sacrifices 2.5V operation and Ioff safety; SN74AVC4T245RGYR provides better ron and density but cannot interface with 5V systems - making SN74CB3T3245PWR uniquely suited for mixed-voltage industrial backplanes requiring robustness and wide VCC range.
Availability
SN74CB3T3245PWR is available at Aetrix Electronics and suitable for PCI interface design, USB 2.0 transceiver isolation, and memory interleaving applications requiring stable component supply, long-term lifecycle assurance, and industrial temperature qualification.
Supply support for SN74CB3T3245PWR 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 solutions, with over 90 years of innovation in high-reliability IC design and manufacturing.
The SN74CB3T3245PWR belongs to TI's CB3T family of FET bus switches, engineered specifically for low-latency, low-power, mixed-voltage domain bridging in portable, industrial, and communications infrastructure equipment.
FAQ
What is the maximum allowable I/O voltage for SN74CB3T3245PWR when VCC = 0V?
The SN74CB3T3245PWR supports 5V-tolerant I/Os even when unpowered: VI/O can safely reach 5.5V with VCC = 0V, enabled by internal clamp structures and Ioff protection. This allows safe hot-plug operation and power sequencing independence. The SN74CB3T3245PWR maintains this rating across its full operating temperature range (–40°C to +85°C), as verified in Section 5.1 Absolute Maximum Ratings of the SCDS136E datasheet.
Does SN74CB3T3245PWR support 2.5V operation with 5V input signals?
Yes. With VCC = 2.5V, the SN74CB3T3245PWR performs 5V-to-2.5V down-translation on all eight channels, as explicitly stated in Feature section "Supports mixed-mode signal operation" and validated in Figure 7-1 DC voltage translation curves. The output voltage tracks VCC, ensuring clean 2.5V logic levels while accepting 5V inputs - a core capability confirmed in TI's recommended operating conditions (Section 5.3) and functional description (Section 7.1).
What is the typical ON-state resistance (ron) of SN74CB3T3245PWR at VCC = 3.3V?
The typical ON-state resistance (ron) of SN74CB3T3245PWR is 5Ω at VCC = 3.3V, measured at IO = 32mA (Section 5.5 Electrical Characteristics). This value is consistent across temperature and ensures minimal voltage drop (<165 mV) and negligible power loss (<5.3 mW per channel), preserving signal swing and timing margins in high-speed digital buses.
How does the OE pin function on SN74CB3T3245PWR?
The OE (Output Enable) pin on SN74CB3T3245PWR is active-low: when OE = low, all eight A↔B switches turn ON for bidirectional conduction; when OE = high, all channels enter high-impedance isolation. To ensure defined state during power-up, TI recommends tying OE to VCC via a pullup resistor (Section 7.1). This behavior is documented in Table 7-1 Function Table and Figure 7-2 Logic Diagram.
Is SN74CB3T3245PWR compatible with standard '245 pinout layouts?
Yes. The SN74CB3T3245PWR uses the industry-standard '245 pinout configuration (A1–A8 on pins 2–9, B1–B8 on pins 11–18, OE on pin 19, VCC on pin 20, GND on pin 10), as confirmed in Figure 4-1 and Table 4-1 Pin Functions. This enables direct PCB footprint compatibility with legacy 74LS245, 74LVC245, and other '245-family devices - no layout changes required for migration.
SN74CB3T3245PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
SN74CB3T3245PWR FAQ
1.How can I place an order for SN74CB3T3245PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3T3245PWR 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 SN74CB3T3245PWR reliable?
The price and inventory of SN74CB3T3245PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3T3245PWR is usually 5 days.
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SN74CB3T3245PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3T3245PWR 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 SN74CB3T3245PWR?
For technical support, including SN74CB3T3245PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3T3245PWR requirements.
6.How does Aetrix verify that SN74CB3T3245PWR is sourced from the original manufacturer or authorized distributors?
All SN74CB3T3245PWR 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 SN74CB3T3245PWR meets industry standards.
7.What is the process for return or replacement of SN74CB3T3245PWR?
All SN74CB3T3245PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3T3245PWR, 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 SN74CB3T3245PWR part is unused and in its original packaging.
Return procedure for SN74CB3T3245PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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