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Texas Instruments SN74CB3T3253PW
- Part No.:
- SN74CB3T3253PW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CB3T3253PW.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,395
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Product details
Overview
SN74CB3T3253PW from Texas Instruments is a dual 1-of-4 FET multiplexer/demultiplexer bus switch with 5V-tolerant I/Os, 2.3V–3.6V VCC operation, 5Ω typical ON-state resistance, bidirectional signal flow, and Ioff partial-power-down support. It enables level translation between 5V, 3.3V, and 2.5V domains in USB interfaces and memory interleaving systems.
For engineers reviewing the SN74CB3T3253PW datasheet, SN74CB3T3253PW pinout, SN74CB3T3253PW application, or SN74CB3T3253PW equivalent, key selection criteria include mixed-mode voltage translation tracking VCC, 5V-tolerant I/Os during power-up/down, near-zero propagation delay (≤0.25 ns at 3.3V), low input/output capacitance (5pF typ OFF), and TSSOP-16 package compatibility with high-density PCB layouts.
Technical Context
The SN74CB3T3253PW integrates two independent 1-of-4 analog switches controlled by active-low OE and 2-bit S1/S0 select inputs. Each channel supports bidirectional data flow with rail-to-rail switching and output voltage translation that tracks VCC - enabling 5V input to 3.3V/2.5V output level shift without external components.
Its Ioff feature guarantees isolation during partial power-down by limiting backflow current to ±10 µA when VCC = 0V, while undershoot clamp diodes on all I/Os and control pins protect against transient overvoltage. The device operates across –40°C to +85°C with guaranteed 5Ω rON at 2.5V and 3.3V VCC, and supports 0V–5.5V signaling on data I/Os regardless of VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - enables operation in 2.5V and 3.3V systems with margin for supply variation |
| rON (Typ) | 5Ω at 2.5V and 3.3V - minimizes insertion loss and signal distortion in high-speed digital paths |
| I/O Voltage Range | 0V to 5.5V - supports 5V-tolerant interfacing with legacy TTL while powered from 2.5V/3.3V rails |
| Propagation Delay | 0.25 ns at 3.3V (CL = 50pF) - preserves signal integrity in >1 GHz data paths with negligible timing skew |
| Ioff Leakage | ±10 µA at VCC = 0V - ensures safe isolation during system sleep modes without external power gating |
| Cio(OFF) | 5pF (B-port), 15pF (A-port) - reduces capacitive loading on source and destination buses during OFF state |
| ESD Rating | ±2000V HBM, ±1000V CDM - meets industrial-grade robustness requirements without external protection |
Pinout & Package
PW package: 16-pin Thin Shrink Small Outline Package (TSSOP), 5.0 mm × 6.4 mm body size, 0.65 mm lead pitch, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of each 1-of-4 mux; drives associated A/B path into high-Z when high |
| S1, S0 | Binary select inputs | 2-bit address selects one of four B-port channels (B1–B4) to connect bidirectionally with A port |
| 1A, 2A | Common channel terminals | Central bidirectional I/O nodes - each connects to selected Bx channel when corresponding OE is low |
| 1B1–1B4, 2B1–2B4 | Channel I/O terminals | Four per-mux data paths; support 0V–5.5V signaling regardless of VCC value |
| VCC | Power supply | Supplies internal FET gate drive and logic; sets output voltage translation reference |
| GND | Ground reference | Return path for all internal currents and I/O clamp diodes |
Key Features
| Feature | Design Value |
|---|---|
| Voltage translation tracking VCC | Output levels follow VCC - enables seamless 5V→3.3V or 5V/3.3V→2.5V level shift without external resistors or translators |
| 5V-tolerant I/Os with VCC off | Supports hot-plug and partial-power-down - I/Os remain protected and non-loading even when VCC = 0V |
| Bidirectional zero-delay switching | Signal passes in either direction with <0.25 ns propagation delay - preserves timing margins in full-duplex links |
| Low OFF-state capacitance | 5pF (B-port) isolation capacitance - minimizes crosstalk and loading on adjacent high-speed traces |
| Integrated undershoot clamp diodes | Clamps negative transients to –1.2V - eliminates need for external TVS diodes in noisy industrial environments |
Applications
| USB Interface Isolation | Memory Interleaving |
|---|---|
|
Use Scenario: Isolating USB 2.0 D+/D− lines between host controller (3.3V) and peripheral (5V) during enumeration and suspend/resume cycles. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling protocol-transparent level translation and bus segmentation. Use Value: Eliminates external level shifters and enables compliant hot-plug operation with <0.25 ns added delay and 5V-tolerant I/Os during VCC power-down. |
Use Scenario: Dynamically routing address/data lines between two DDR2 memory banks operating at different voltage domains (2.5V vs 3.3V). IC Role / Device Role / Timing Role: Dual-channel 1-of-4 multiplexer providing low-latency, low-capacitance path selection under memory controller arbitration. Use Value: Achieves sub-nanosecond timing alignment across banks with 5Ω rON and 5pF OFF capacitance - preserving setup/hold margins at 400 MT/s. |
| Legacy Bus Level Translation | Low-Power Portable Equipment |
|
Use Scenario: Interfacing 5V microcontroller GPIOs with 2.5V sensor interface ICs in industrial data loggers where mixed-voltage design is unavoidable. IC Role / Device Role / Timing Role: Voltage-translating bus switch supporting 0.8V–5V signaling standards without direction control pins. Use Value: Reduces BOM count by replacing discrete MOSFET translators; maintains 5V tolerance during brown-out conditions with Ioff isolation. |
Use Scenario: Enabling dynamic power domain partitioning in battery-powered handheld test equipment with multiple voltage rails (1.8V core, 3.3V I/O, 5V display). IC Role / Device Role / Timing Role: Low-quiescent-current (20 µA max ICC) switch isolating unused peripherals during sleep mode. Use Value: Extends battery life via Ioff-enabled partial power-down - leakage held to ±10 µA with VCC = 0V and I/Os at 5.5V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3253PW | Lower VCC range (2.3V–3.6V same), but 3Ω rON typ and higher ICC (50 µA max); no Ioff spec confirmed | Higher performance in low-resistance paths, but lacks guaranteed Ioff isolation for partial-power-down use cases | Prefer SN74CB3T3253PW when system-level power sequencing requires fail-safe isolation during VCC ramp-down |
| TS3DS10224RGTR | Single-supply 2.7V–4.3V operation; 4Ω rON; 12-bit resolution not applicable - this is an analog switch, not a digital bus switch | Designed for audio/video signal routing, not digital bus translation; lacks 5V-tolerant I/Os and mixed-mode translation | SN74CB3T3253PW remains optimal for digital-level translation with 5V tolerance and VCC-tracking outputs |
Compared with SN74CBTLV3253PW and TS3DS10224RGTR, the SN74CB3T3253PW uniquely combines guaranteed Ioff isolation, 5V-tolerant I/Os during power-off, and VCC-tracked output translation - making it the only option qualified for mixed-voltage digital bus isolation in safety-critical power sequencing.
Availability
SN74CB3T3253PW is available at Aetrix Electronics and suitable for USB interface isolation, memory interleaving, and legacy bus level translation requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CB3T3253PW 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 company delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The SN74CB3T3253PW belongs to TI's CB3T bus switch family, engineered for low-voltage, high-speed digital signal routing with integrated level translation and robust power-down behavior in space-constrained portable and industrial systems.
FAQ
What voltage levels can SN74CB3T3253PW translate between?
The SN74CB3T3253PW supports bidirectional level translation between 0V–5.5V I/O signals and a 2.3V–3.6V VCC supply. It enables 5V input to 3.3V or 2.5V output translation, with output voltage tracking VCC - verified across –40°C to +85°C with no external components required. This capability is intrinsic to the FET switch architecture and confirmed in the Typical DC Voltage-Translation Characteristics plot.
Does SN74CB3T3253PW support partial power-down operation?
Yes, SN74CB3T3253PW fully supports partial power-down via its Ioff feature. When VCC = 0V, Ioff limits backflow current to ±10 µA (max) across all I/Os, ensuring safe isolation and preventing damage to upstream or downstream circuitry. This behavior is tested per JESD 17 and specified in the Electrical Characteristics table under "Power down switch leakage current".
What is the maximum signal frequency supported by SN74CB3T3253PW?
SN74CB3T3253PW does not specify a hard maximum frequency limit, but its 0.25 ns propagation delay (at 3.3V, CL = 50pF) and 5Ω rON support clean signal transmission up to ≥1 GHz in well-designed PCB layouts. System-level bandwidth is governed by trace impedance, load capacitance, and termination - not the device itself - as confirmed by the RC-based tpd calculation method in Section 6.
Is SN74CB3T3253PW pin-compatible with other TI bus switches?
SN74CB3T3253PW shares the same TSSOP-16 pinout and functional mapping as SN74CBTLV3253PW and SN74CBT3253PW, including identical OE, S1/S0, A/B port, VCC, and GND placements. However, differences in rON, ICC, and Ioff specs mean direct substitution requires validation of timing, power, and isolation requirements in the target application.
What package options are available for SN74CB3T3253PW?
SN74CB3T3253PW is exclusively offered in the PW (TSSOP-16) package: 5.0 mm × 6.4 mm body, 0.65 mm lead pitch, RoHS-compliant NIPDAU finish, and MSL Level-1 rating. Alternate packages like SOIC (D), SSOP (DBQ), and TVSOP (DGV) exist for the SN74CB3T3253 family but correspond to distinct orderable part numbers - SN74CB3T3253PW refers only to the TSSOP variant.
SN74CB3T3253PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 2 x 4:1
- 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:
- 16-TSSOP
SN74CB3T3253PW FAQ
1.How can I place an order for SN74CB3T3253PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3T3253PW 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 SN74CB3T3253PW reliable?
The price and inventory of SN74CB3T3253PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3T3253PW is usually 5 days.
3.What payment methods are accepted for SN74CB3T3253PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CB3T3253PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CB3T3253PW?
SN74CB3T3253PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3T3253PW 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 SN74CB3T3253PW?
For technical support, including SN74CB3T3253PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3T3253PW requirements.
6.How does Aetrix verify that SN74CB3T3253PW is sourced from the original manufacturer or authorized distributors?
All SN74CB3T3253PW 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 SN74CB3T3253PW meets industry standards.
7.What is the process for return or replacement of SN74CB3T3253PW?
All SN74CB3T3253PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3T3253PW, 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 SN74CB3T3253PW part is unused and in its original packaging.
Return procedure for SN74CB3T3253PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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