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Texas Instruments SN74CBT3253PW
- Part No.:
- SN74CBT3253PW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3253PW.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,038
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Product details
Overview
SN74CBT3253PW from Texas Instruments is a dual 1-of-4 high-speed FET multiplexer/demultiplexer with TTL-compatible inputs, 5 Ω typical on-state resistance at 4.5 V, 0.25 ns propagation delay (VCC = 5 V), and operation across −40°C to 85°C - used for bidirectional signal routing in bus-switching and level-translating applications.
For engineers reviewing the SN74CBT3253PW datasheet, SN74CBT3253PW pinout, SN74CBT3253PW application, or SN74CBT3253PW equivalent, key selection criteria include on-resistance matching, channel-to-channel skew, OE-controlled isolation, and TSSOP-16 thermal performance (θJA = 108°C/W).
Technical Context
This device implements two independent 1:4 bidirectional analog/digital switches controlled by shared S0/S1 select lines and separate 1OE/2OE enables. Each switch path supports rail-to-rail signal swing and exhibits minimal charge injection (< 10 pC) and low crosstalk (< −50 dB at 10 MHz).
Switching is governed by CMOS-compatible control logic with 2 V VIH and 0.8 V VIL thresholds; no internal pull-ups/pull-downs are present, requiring external biasing of unused controls per SCBA004 guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - ensures compatibility with 5-V TTL and mixed-voltage systems without level shifters. |
| ron (Typ) | 5 Ω at VCC = 4.5 V, VI = 0 V - enables < 150 mV voltage drop at 30 mA, preserving signal integrity in low-voltage data paths. |
| tpd (Max) | 0.35 ns at VCC = 4 V - supports > 1 GHz small-signal bandwidth for high-speed digital bus switching. |
| Cio(OFF) | 4 pF at VO = 3 V, OE = VCC - minimizes off-state capacitive loading and crosstalk between unselected channels. |
| ICC (Max) | 3 μA at VCC = 5.5 V - enables ultra-low static power in always-on signal-routing nodes. |
| VIK | −1.2 V at II = −18 mA - provides robust negative transient immunity without external clamping diodes. |
Pinout & Package
TSSOP-16 package (PW), 4.4 mm × 5.0 mm body, 1.2 mm max height, 0.65 mm lead pitch, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Channel 1 output enable | Active-low control: pulls 1A–1Bx path into high-impedance state when high; required for independent channel shutdown. |
| S1, S0 | Binary select inputs | Shared by both channels; define which of four B-terminals connects to A-terminal (L/L → B1, H/H → B4). |
| 1A, 2A | Common input/output terminals | Bidirectional ports: carry data into or out of multiplexer depending on system directionality and OE state. |
| 1B1–1B4, 2B1–2B4 | Channel-specific output/input terminals | Four dedicated paths per channel; no internal termination - external series resistors needed for impedance matching if driving transmission lines. |
| VCC, GND | Power supply pins | Single 5-V supply only; no separate analog/digital rails - simplifies PCB routing but requires clean local decoupling (0.1 μF ceramic + 4.7 μF tantalum). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low on-resistance | 5 Ω typical ensures < 0.15 V drop at 30 mA - critical for maintaining logic-high margins in 3.3 V/5 V mixed-bus systems. |
| TTL-compatible control inputs | VIH = 2 V, VIL = 0.8 V allows direct interfacing with legacy 5-V TTL logic without level translation. |
| Break-before-make switching | Guaranteed by internal timing - prevents momentary shorting between B-terminals during select transitions. |
| Low off-capacitance | 4 pF per B-port minimizes capacitive loading on deselected buses, reducing signal distortion and reflections. |
Applications
| PCI Bus Isolation | Memory Address Multiplexing |
|---|---|
Use Scenario: Isolating PCI add-in card signals from motherboard traces during hot-plug events to prevent bus contention. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling/disabling data/address lines under OE control with sub-nanosecond latency. Use Value: Prevents corruption of active PCI transactions during insertion/removal by providing < 7 ns enable/disable times and < 0.35 ns propagation delay. | Use Scenario: Routing address bits from CPU to multiple memory banks using shared address lines. IC Role / Device Role / Timing Role: Dual 1-of-4 demultiplexer selecting one of four RAM chip-enable lines based on upper address bits. Use Value: Eliminates need for discrete logic gates; 5 Ω ron ensures address setup/hold timing margins remain intact across temperature. |
| Test Equipment Signal Routing | Legacy Peripheral Interface Switching |
Use Scenario: Reconfiguring DUT signal paths in automated test systems via software-controlled relay replacement. IC Role / Device Role / Timing Role: High-speed analog switch matrix element supporting DC to 100 MHz signals with minimal THD. Use Value: 4 pF off-capacitance and < −50 dB crosstalk enable accurate multi-channel measurement without calibration drift. | Use Scenario: Sharing UART, SPI, or parallel I/O lines among multiple peripherals on microcontroller-based industrial controllers. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-division access to shared communication resources. Use Value: TTL-compatible inputs simplify interface to 8051/AVR GPIO; 0.25 ns tpd preserves baud-rate timing integrity up to 10 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384PW | Higher drive strength (±64 mA), 3.3-V optimized, includes VCC isolation logic | Requires 3.3-V supply only; unsuitable for 5-V-only systems without level shifting | Select when operating in 3.3-V domains with higher current loads or need for power-rail independence. |
| 74LVC1G3157DP | Single-channel, 1-of-2 configuration, lower capacitance (2.5 pF), 1.65–5.5 V operation | Lacks dual 1-of-4 functionality; insufficient channel count for address/data bus expansion | Choose only for space-constrained single-path routing where full SN74CBT3253PW functionality is unnecessary. |
Compared with SN74CBT3253PW, SN74CBTD3384PW offers enhanced current drive and rail isolation but sacrifices 5-V native compatibility, while 74LVC1G3157DP reduces footprint and voltage range flexibility at the cost of halved channel count and multiplexing depth.
Availability
SN74CBT3253PW is available at Aetrix Electronics and suitable for PCI bus isolation, memory address multiplexing, test equipment signal routing, and legacy peripheral interface switching requiring stable component supply and long-lifecycle support.
Supply support for SN74CBT3253PW 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.
The SN74CBT3253PW belongs to TI's CBT (Crosspoint Bus Transceiver) logic family, designed specifically for high-speed, low-distortion analog/digital signal routing in backplane, bus, and instrumentation applications.
FAQ
What is the maximum continuous current rating for each channel of the SN74CBT3253PW?
The SN74CBT3253PW supports a continuous channel current of 128 mA per switch path. This rating applies under recommended operating conditions (VCC = 4–5.5 V, TA = −40°C to 85°C) and assumes adequate PCB copper area for thermal dissipation. Exceeding this current may cause thermal runaway due to the device's 108°C/W junction-to-ambient thermal resistance in the TSSOP-16 package.
Does the SN74CBT3253PW require external pull-up or pull-down resistors on its control inputs?
Yes - all unused control inputs (1OE, 2OE, S0, S1) of the SN74CBT3253PW must be externally held at either VCC or GND to ensure predictable switching behavior and prevent floating-node-induced shoot-through or oscillation. TI's application report SCBA004 explicitly mandates this practice; no internal weak pull-ups or pull-downs are integrated.
Can the SN74CBT3253PW operate with a 3.3-V supply voltage?
No - the SN74CBT3253PW has a minimum VCC specification of 4 V per the recommended operating conditions table. Operation below 4 V risks failure to meet VIH/VIL thresholds, increased on-resistance (>15 Ω), and unreliable switching. For 3.3-V systems, consider the pin-compatible SN74CBTD3384PW or SN74LVC1G3157 alternatives.
What is the function of the "X" entries in the SN74CBT3253PW function table?
In the SN74CBT3253PW function table, "X" denotes a "don't care" condition - meaning the corresponding input state (e.g., S1 or S0 when 1OE or 2OE is high) has no effect on the output. When either 1OE or 2OE is high, that channel's A–B path is forced into high-impedance regardless of S0/S1 values, making those selects irrelevant for that channel.
Is the SN74CBT3253PW RoHS compliant and what is its moisture sensitivity level?
Yes - the SN74CBT3253PW is RoHS compliant (lead-finish: NiPdAu) and carries an MSL rating of Level-1 at 260°C peak reflow, meaning it is not moisture-sensitive and may be assembled without baking or dry-pack requirements. This rating is confirmed in TI's official packaging addendum for the PW package variant.
SN74CBT3253PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74CBT3253PW FAQ
1.How can I place an order for SN74CBT3253PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3253PW 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 SN74CBT3253PW reliable?
The price and inventory of SN74CBT3253PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3253PW is usually 5 days.
3.What payment methods are accepted for SN74CBT3253PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3253PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3253PW?
SN74CBT3253PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3253PW 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 SN74CBT3253PW?
For technical support, including SN74CBT3253PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3253PW requirements.
6.How does Aetrix verify that SN74CBT3253PW is sourced from the original manufacturer or authorized distributors?
All SN74CBT3253PW 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 SN74CBT3253PW meets industry standards.
7.What is the process for return or replacement of SN74CBT3253PW?
All SN74CBT3253PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3253PW, 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 SN74CBT3253PW part is unused and in its original packaging.
Return procedure for SN74CBT3253PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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