My Inquiry
My Account
Texas Instruments SN74CB3T3253D
- Part No.:
- SN74CB3T3253D
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74CB3T3253D.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:241
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74CB3T3253D from Texas Instruments is a dual 1-of-4 FET multiplexer/demultiplexer optimized for low-voltage bus switching and bidirectional level translation between 0V–5V I/O domains. It features 5Ω typical ON-state resistance, 5V-tolerant I/Os with VCC = 2.3V–3.6V, Ioff partial-power-down protection, and near-zero propagation delay (0.15 ns at 2.5V). It enables mixed-mode signal routing in USB interfaces and memory interleaving systems.
For engineers reviewing the SN74CB3T3253D datasheet, SN74CB3T3253D pinout, SN74CB3T3253D application, or SN74CB3T3253D equivalent, key selection criteria include its 5V-tolerant I/O capability under 2.5V/3.3V VCC, rail-to-rail voltage translation tracking VCC, bidirectional operation without direction control, Ioff isolation during power-down, and SOIC-16 package compatibility with legacy board layouts.
Technical Context
The SN74CB3T3253D implements two independent 4:1 analog switch arrays using NMOS pass-gate topology with gate drive referenced to VCC + VT, enabling rail-to-rail conduction and output voltage translation that tracks VCC. Each channel supports bidirectional data flow with no inherent directionality.
It operates across VCC = 2.3V–3.6V while accepting 0V–5.5V signals on all I/O pins, with undershoot clamp diodes and Ioff functionality ensuring safe operation during partial power-down. Control inputs accept TTL or 5V/3.3V CMOS logic levels regardless of VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - Enables direct integration into 2.5V and 3.3V logic domains without external level shifters. |
| ON-State Resistance (rON) | 5 Ω typ - Minimizes voltage drop and signal distortion in high-speed digital or analog signal paths. |
| I/O Voltage Range | 0V to 5.5V - Supports 5V-tolerant operation even when powered down or at 2.5V VCC, critical for hot-swap and mixed-voltage systems. |
| Propagation Delay (tpd) | 0.15 ns at 2.5V - Near-zero delay preserves timing integrity in high-frequency bus applications like USB 2.0 control lines. |
| IOFF Leakage | ±10 µA max - Ensures robust channel isolation during system sleep or partial power-down modes. |
| Input/Output Capacitance (CIO(OFF)) | 5 pF typ (B port) - Reduces capacitive loading on source and destination buses, improving signal rise/fall times. |
| ESD Rating (HBM) | ±2000 V - Meets Class II ESD robustness for handling in standard manufacturing environments. |
Pinout & Package
SN74CB3T3253D is housed in a 16-pin SOIC (D) package measuring 9.9 mm × 6 mm, with standard 1.27 mm pitch and surface-mount footprint compatible with IPC-7351B SOIC16_NOM.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable (per channel) | Independent control of each 4:1 mux; low = enabled, high = high-Z isolation; supports staggered power sequencing. |
| S1, S0 | Binary select inputs | Determine which of four B-port I/Os connects to the common A port (L/L = B1, L/H = B2, H/L = B3, H/H = B4). |
| 1A, 2A | Common channel I/O terminals | Bidirectional ports serving as multiplexer inputs (mux mode) or demultiplexer outputs (demux mode); no direction pin required. |
| 1B1–1B4, 2B1–2B4 | Channel I/O terminals | Four dedicated I/O paths per channel; all support 0V–5V signaling and clamp diodes for undershoot protection. |
| VCC | Supply voltage input | Powers internal logic and switch gates; sets translation reference - output voltage follows VCC when driven by higher-voltage inputs. |
| GND | Ground reference | Return path for supply current and signal references; must be low-impedance to maintain noise margin and translation accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage translation tracking VCC | Enables 5V→3.3V or 5V/3.3V→2.5V level shifting without external components - output swing matches VCC regardless of input voltage up to 5.5V. |
| 5V-tolerant I/Os with powered-down isolation | Permits live insertion into 5V backplanes while VCC = 0V; Ioff blocks backdrive current, preventing damage to unpowered subsystems. |
| Bidirectional zero-delay switching | Eliminates need for direction control logic or separate transmit/receive paths - ideal for shared bus arbitration and USB D+/D− routing. |
| Low 5Ω rON and 5pF CIO(OFF) | Preserves signal integrity in high-speed digital links (e.g., memory address/data buses) and reduces crosstalk in dense PCB layouts. |
| TTL/CMOS-compatible control inputs | Accepts 0.8V VIH thresholds at 2.3V VCC - interoperable with legacy 5V TTL controllers and modern 3.3V/2.5V microcontrollers without interface logic. |
Applications
| USB Interface Signal Routing | Memory Interleaving Control |
|---|---|
Use Scenario: Selecting between two USB device controllers sharing a single USB PHY transceiver. IC Role / Device Role / Timing Role: Bidirectional 4:1 analog switch enabling dynamic reconfiguration of D+, D−, VBUS, and ID lines without protocol-aware logic. Use Value: Eliminates need for discrete MOSFET switches and level-shifting buffers, reducing BOM count and layout area while maintaining USB 2.0 signal integrity. |
Use Scenario: Dynamically routing address and data lines between two banks of SDRAM operating at different voltages (e.g., 3.3V and 2.5V). IC Role / Device Role / Timing Role: Voltage-translating bus switch providing seamless inter-bank access with sub-nanosecond propagation delay. Use Value: Enables real-time memory bank switching in embedded systems without timing skew or level-mismatch errors. |
| Low-Power Portable Equipment Bus Isolation | Legacy System Level Translation |
Use Scenario: Isolating sensor interface bus from main processor during sleep mode in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Ioff-enabled switch disconnecting peripherals while preserving 5V-tolerant I/O state during VCC = 0V. Use Value: Reduces quiescent current to <10 µA per channel and prevents backfeed into powered-down subsystems. |
Use Scenario: Interfacing a 5V industrial PLC output module with a 3.3V FPGA-based controller. IC Role / Device Role / Timing Role: Passive voltage translator supporting 5V→3.3V conversion on control/status lines with no active logic or clock required. Use Value: Provides deterministic DC-level translation without introducing jitter, latency, or power supply dependencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3253D | Higher rON (7Ω typ), no Ioff, VCC = 4.5V–5.5V only - lacks 5V-tolerant operation at low VCC and partial-power-down protection. | Restricted to 5V-only systems; unsuitable for mixed-voltage or hot-swap designs requiring Ioff. | Select SN74CB3T3253D when interfacing 5V signals with 2.5V/3.3V logic or implementing power-gated isolation. |
| TS3A27518EIPWR | Lower rON (0.75Ω typ), 3.6V max VCC, integrated charge pump for rail-to-rail switching - requires external VCC ≥ 1.65V but does not support 5V-tolerant I/O at VCC = 2.5V. | Better for ultra-low-resistance analog switching below 3.6V; cannot replace SN74CB3T3253D in 5V-tolerant or VCC = 2.3V applications. | Choose TS3A27518EIPWR for high-fidelity analog signal routing where rON < 1Ω is critical and 5V tolerance is unnecessary. |
Compared with SN74CBT3253D and TS3A27518EIPWR, SN74CB3T3253D uniquely combines 5V-tolerant I/O operation across 2.3V–3.6V VCC, Ioff isolation, and 5Ω rON - making it the only option for robust mixed-voltage bus switching in portable and industrial equipment with partial-power-down requirements.
Availability
SN74CB3T3253D is available at Aetrix Electronics and suitable for USB interface routing, memory interleaving control, and low-power portable equipment bus isolation requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CB3T3253D 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 specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and interface solutions.
The SN74CB3T3253D belongs to TI's CB3T family of low-voltage bus switches, designed specifically for mixed-signal voltage translation and high-speed bidirectional data routing in space-constrained, power-sensitive applications.
FAQ
What is the maximum signal voltage supported on the I/O pins of the SN74CB3T3253D?
The SN74CB3T3253D supports 0V to 5.5V on all data I/O pins (1A, 2A, 1B1–1B4, 2B1–2B4), regardless of VCC level. This 5V-tolerant capability remains valid whether the device is powered (VCC = 2.3V–3.6V) or fully powered down (VCC = 0V), enabling safe hot-plug operation in mixed-voltage systems.
Does the SN74CB3T3253D require external pull-up resistors on OE pins?
Yes - to ensure a defined high-impedance state during power-up or power-down, TI recommends tying 1OE and 2OE to VCC via pull-up resistors. The minimum resistor value depends on the driver's current-sinking capability; typical values range from 10 kΩ to 100 kΩ for standard CMOS drivers.
Can the SN74CB3T3253D translate 5V logic signals to 2.5V levels while operating at VCC = 2.5V?
Yes - the SN74CB3T3253D provides output voltage translation that tracks VCC. When VCC = 2.5V and a 5V signal is applied to a B-port pin, the corresponding A-port output is clamped to approximately 2.5V, enabling reliable 5V-to-2.5V level shifting without external components.
What is the thermal resistance (θJA) of the SN74CB3T3253D in its SOIC package?
The SN74CB3T3253D in the D (SOIC-16) package has a junction-to-ambient thermal resistance (θJA) of 73°C/W, as specified in the Thermal Information table. This value assumes standard JEDEC 2S2P test board conditions and guides thermal design for continuous operation up to 85°C ambient.
How does the Ioff feature protect the SN74CB3T3253D during partial power-down?
The Ioff feature disables the internal FET channels when VCC = 0V, limiting leakage current to ±10 µA maximum between any I/O pin and GND. This prevents damaging back-current flow from live 5V buses into unpowered circuitry - a critical safeguard in modular systems with independent power domains.
SN74CB3T3253D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74CB3T3253D FAQ
1.How can I place an order for SN74CB3T3253D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3T3253D 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 SN74CB3T3253D reliable?
The price and inventory of SN74CB3T3253D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3T3253D is usually 5 days.
3.What payment methods are accepted for SN74CB3T3253D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CB3T3253D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CB3T3253D?
SN74CB3T3253D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3T3253D 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 SN74CB3T3253D?
For technical support, including SN74CB3T3253D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3T3253D requirements.
6.How does Aetrix verify that SN74CB3T3253D is sourced from the original manufacturer or authorized distributors?
All SN74CB3T3253D 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 SN74CB3T3253D meets industry standards.
7.What is the process for return or replacement of SN74CB3T3253D?
All SN74CB3T3253D units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3T3253D, 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 SN74CB3T3253D part is unused and in its original packaging.
Return procedure for SN74CB3T3253D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74CB3T3253D Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
