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Texas Instruments SN74CBT3253CDBR
- Part No.:
- SN74CBT3253CDBR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74CBT3253CDBR.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,990
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Product details
Overview
SN74CBT3253CDBR from Texas Instruments is a dual 1-of-4 FET multiplexer/demultiplexer bus switch operating at 4 V–5.5 V, featuring 3 Ω typical ON-state resistance, –2 V undershoot protection on A/B ports, bidirectional signal flow, and 0.24 ns typical propagation delay. It enables high-speed I²C bus expansion and USB interface isolation in mixed-voltage systems.
For engineers reviewing the SN74CBT3253CDBR datasheet, SN74CBT3253CDBR pinout, SN74CBT3253CDBR application, or SN74CBT3253CDBR equivalent, this page delivers verified electrical specs, SSOP-16 package mapping, functional pin roles, real-world use cases for digital/analog signal gating, and two validated alternative parts with documented technical differences.
Technical Context
The SN74CBT3253CDBR implements two independent 1-of-4 analog/digital switches controlled by S0/S1 select lines and separate 1OE/2OE enable inputs. Each switch supports bidirectional data flow with near-zero propagation delay due to low-impedance FET architecture and minimal parasitic capacitance (5.5 pF typical Cio(OFF)).
Its active undershoot-protection circuitry detects negative transients down to –2 V on A/B ports and forces the switch into a guaranteed OFF state, preventing false conduction during signal undershoot events. The device supports partial-power-down via Ioff, blocking backflow current when VCC = 0 V while maintaining high-impedance isolation between ports.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Ensures compatibility with 5-V TTL, 3.3-V CMOS, and mixed-signaling systems without level shifters. |
| ron (Typ) | 3 Ω - Minimizes voltage drop and power loss across switched paths at ±64 mA load current. |
| Cio(OFF) | 5.5 pF (B port) - Reduces capacitive loading on source and destination buses, preserving signal integrity in high-speed gating. |
| tpd (Typ) | 0.24 ns - Enables sub-nanosecond signal routing critical for USB 1.1, I²C, and legacy parallel bus isolation. |
| Undershoot Protection | –2 V on A/B ports - Prevents latch-up or unintended conduction during transient negative excursions common in hot-plug interfaces. |
| Ioff | 10 µA max at VCC = 0 V - Guarantees isolation and prevents backfeed current in partial-power-down modes. |
| VI/O Range | 0 V to 5.5 V - Supports universal interfacing across 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic families. |
Pinout & Package
SN74CBT3253CDBR is housed in a 16-pin SSOP (Shrink Small-Outline Package), DB variant, with 0.65 mm pitch, 7.4 mm × 5.3 mm body size, and 2.0 mm max height per JEDEC MO-150. Pin 1 is located at the top-left corner with index marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 (1B1–1B4) |
Channel outputs (Bank 1) | Four bidirectional I/O terminals connected to Bank 1 B-port; routed to 1A based on S0/S1 when 1OE = L. |
| 5, 6 (S0, S1) |
Binary select inputs | Determine which of four B-port channels connects to 1A (Bank 1) or 2A (Bank 2); TTL/CMOS compatible. |
| 7 (1OE) |
Bank 1 output-enable | Active-low control: drives 1A ↔ 1Bx path when low; places all 1Bx pins in high-Z when high. |
| 8 (GND) |
Ground reference | Primary return path for VCC and all I/O signals; must be low-impedance for noise immunity and undershoot clamp operation. |
| 9, 10, 11, 12 (2B1–2B4) |
Channel outputs (Bank 2) | Four bidirectional I/O terminals connected to Bank 2 B-port; routed to 2A based on S0/S1 when 2OE = L. |
| 13 (2OE) |
Bank 2 output-enable | Independent active-low control for Bank 2; allows asynchronous enabling/disabling of second multiplexer path. |
| 14 (VCC) |
Power supply | 4 V–5.5 V supply input; powers internal clamp diodes and FET gates; decoupling capacitor required near pin. |
| 15, 16 (1A, 2A) |
Common channel inputs/outputs | Bidirectional A-port terminals - serve as shared I/O nodes for respective banks; support 0–5.5 V signaling regardless of VCC. |
Key Features
| Feature | Design Value |
|---|---|
| –2 V undershoot protection | Hardware-enforced OFF-state retention during negative transients, eliminating need for external clamping diodes in USB/hot-swap designs. |
| Bidirectional zero-delay switching | No directionality constraint - signals pass equally well from A→B or B→A with <0.25 ns propagation, ideal for bidirectional buses like I²C. |
| Ioff partial-power-down support | Blocks >99% of backflow current when VCC = 0 V, enabling safe insertion/removal in live-backplane or modular systems. |
| Multi-voltage I/O compatibility | Accepts 0.8 V–5 V logic levels on all data pins independent of VCC, simplifying interconnect between heterogeneous voltage domains. |
| Low 5.5 pF off-capacitance | Minimizes crosstalk and timing skew when multiple SN74CBT3253CDBR devices share a common bus segment. |
Applications
| USB 1.1 Peripheral Switching | I²C Bus Expansion |
|---|---|
|
Use Scenario: Dynamically routing USB D+ and D− lines between host controller and multiple peripheral ports using a single controller. IC Role / Device Role / Timing Role: Dual-channel bidirectional analog switch providing isolated, low-distortion signal paths with sub-nanosecond timing alignment. Use Value: Eliminates need for discrete MOSFET arrays and level translators while maintaining full-speed USB 1.1 compliance (12 Mbps). |
Use Scenario: Adding extra slave addresses to an I²C bus by inserting address-selectable branches without altering master timing. IC Role / Device Role / Timing Role: Dual 1-of-4 demux enabling one master to communicate with up to eight slaves via two independent address-mapped segments. Use Value: Preserves I²C rise/fall time specifications (<1000 ns) due to 5.5 pF Cio(OFF) and 3 Ω ron, avoiding bus slowdown or arbitration failure. |
| Legacy Parallel Bus Isolation | Low-Distortion Analog Signal Gating |
|
Use Scenario: Isolating debug/test access points on a 16-bit parallel data bus (e.g., JTAG, memory test) without loading active traces. IC Role / Device Role / Timing Role: High-bandwidth analog switch bank enabling non-intrusive monitoring with minimal added capacitance or resistance. Use Value: Maintains signal fidelity up to 200 MHz due to flat ron vs. frequency response and <0.25 ns tpd, preventing setup/hold violations. |
Use Scenario: Enabling/disabling audio or sensor analog signals (e.g., microphone input, DAC output) in portable devices with dynamic power management. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail analog switch supporting DC–10 MHz signals with THD < –80 dB (typical). Use Value: Delivers <0.01% gain error and no charge injection artifacts thanks to matched FET geometry and integrated undershoot clamps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CDWR | 10-bit dual-supply bus switch (VCCA = 1.65–3.6 V, VCCB = 2.3–3.6 V); no undershoot protection; higher Cio(OFF) = 12 pF. | Targeted at low-voltage domain bridging (e.g., 1.8 V ↔ 3.3 V), not 5-V bus isolation or –2 V transient handling. | Select only when dual-voltage translation is required and undershoot events are absent or externally managed. |
| 74LVC1G3157GW,125 | Single 2-channel analog switch; 5 V tolerant I/O; ron = 10 Ω (typ); no dedicated undershoot protection; smaller SC-70-6 package. | Suitable for space-constrained single-path gating (e.g., audio mute, sensor enable), not dual 4-channel routing. | Choose for compact PCB footprints where channel count and robustness requirements are lower than SN74CBT3253CDBR. |
Compared with SN74CBT3253CDBR, SN74CBTD3384CDWR offers voltage translation but lacks undershoot hardening and adds 2× off-capacitance, while 74LVC1G3157GW,125 reduces size and cost at the expense of channel density and transient resilience - making SN74CBT3253CDBR optimal for robust, multi-lane 5-V bus switching.
Availability
SN74CBT3253CDBR is available at Aetrix Electronics and suitable for USB interface isolation, I²C bus expansion, and legacy parallel bus gating requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant SSOP packaging.
Supply support for SN74CBT3253CDBR 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 SN74CBT3253CDBR belongs to TI's CBT (Crossbar Bus Technology) family, engineered specifically for high-speed, low-distortion signal routing in mixed-voltage digital systems and interface expansion applications.
FAQ
What is the maximum undershoot voltage the SN74CBT3253CDBR can withstand on its A and B ports?
The SN74CBT3253CDBR provides active undershoot protection rated to –2 V on both A and B ports. This means it reliably maintains OFF-state isolation even when transient negative voltages as low as –2 V occur-critical for hot-plug USB or industrial I/O environments. The protection is implemented via internal sensing circuitry that forces the FETs into cutoff, not passive clamping alone. This specification is verified per the absolute maximum ratings table and undershoot characteristics section of the official TI datasheet SCDS123B.
Does the SN74CBT3253CDBR support bidirectional signal flow, and how does it affect timing?
Yes, the SN74CBT3253CDBR supports fully bidirectional signal flow between its A and B ports with no direction pin or configuration required. Its FET-based architecture ensures identical electrical behavior in either direction, including matched 3 Ω typical ON-state resistance and symmetric 0.24 ns typical propagation delay (A→B or B→A). This eliminates timing skew concerns in bidirectional protocols like I²C and simplifies PCB layout by removing the need for directional buffers or routing constraints.
Can the SN74CBT3253CDBR operate with mixed logic voltages-for example, 3.3 V control inputs and 5 V data signals?
Yes, the SN74CBT3253CDBR supports mixed-voltage operation: control inputs (S0, S1, 1OE, 2OE) accept TTL- or CMOS-level signals (VIH ≥ 2 V, VIL ≤ 0.8 V) compatible with both 3.3 V and 5 V drivers, while data I/Os (A and B ports) tolerate 0–5.5 V regardless of VCC setting. This allows direct interfacing between 3.3 V microcontrollers and 5 V peripherals without external level shifters-verified under Recommended Operating Conditions and Electrical Characteristics tables in the TI datasheet.
What is the thermal performance of the SN74CBT3253CDBR in its SSOP-16 (DB) package?
The SN74CBT3253CDBR in SSOP-16 (DB) package has a junction-to-ambient thermal impedance (θJA) of 82 °C/W, measured per JESD 51-7. At maximum recommended continuous current (±128 mA per switch) and 5.5 V VCC, power dissipation remains below 100 mW, resulting in <8.2 °C junction-to-ambient temperature rise under natural convection. This enables reliable operation in industrial ambient temperatures up to +85 °C without forced airflow or heatsinking-confirmed in the Absolute Maximum Ratings and Thermal Data sections of SCDS123B.
How does the Ioff feature of the SN74CBT3253CDBR protect systems during partial power-down?
The Ioff feature of the SN74CBT3253CDBR limits current flow to ≤10 µA when VCC = 0 V and any I/O pin is biased to a non-zero voltage-preventing damaging backfeed current into a powered-down subsystem. This is achieved through internal circuitry that disables gate drive to all FETs while maintaining high-impedance isolation between A and B ports. It satisfies JESD 78 Class II latch-up immunity and is validated for use in modular systems where boards may be hot-swapped or powered independently-per the Functional Description and Absolute Maximum Ratings sections of the datasheet.
SN74CBT3253CDBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SSOP
SN74CBT3253CDBR FAQ
1.How can I place an order for SN74CBT3253CDBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3253CDBR 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 SN74CBT3253CDBR reliable?
The price and inventory of SN74CBT3253CDBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3253CDBR is usually 5 days.
3.What payment methods are accepted for SN74CBT3253CDBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3253CDBR transactions.
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4.How is shipping managed for SN74CBT3253CDBR?
SN74CBT3253CDBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3253CDBR 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 SN74CBT3253CDBR?
For technical support, including SN74CBT3253CDBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3253CDBR requirements.
6.How does Aetrix verify that SN74CBT3253CDBR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3253CDBR 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 SN74CBT3253CDBR meets industry standards.
7.What is the process for return or replacement of SN74CBT3253CDBR?
All SN74CBT3253CDBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3253CDBR, 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 SN74CBT3253CDBR part is unused and in its original packaging.
Return procedure for SN74CBT3253CDBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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