My Inquiry
My Account
Texas Instruments SN74CB3T3257PWR
- Part No.:
- SN74CB3T3257PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CB3T3257PWR.pdf
- Description:
- IC MUX/DEMUX 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,255
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74CB3T3257PWR from Texas Instruments is a 4-bit 1-of-2 FET multiplexer/demultiplexer with bidirectional signal flow, 5Ω typical ON-state resistance, 5V-tolerant I/Os, and VCC-referenced voltage translation supporting 2.5V/3.3V operation. It enables level-shifting between 5V TTL, 3.3V LVTTL, and 2.5V CMOS buses in USB interface and memory interleaving applications.
For engineers reviewing the SN74CB3T3257PWR datasheet, SN74CB3T3257PWR pinout, SN74CB3T3257PWR application, or SN74CB3T3257PWR equivalent, key selection criteria include its 5V-tolerant I/Os with device powered up or down, Ioff partial-power-down protection, near-zero propagation delay (0.15 ns at 2.5V), low input/output capacitance (5 pF typ), and support for mixed-mode signaling across 0V–5V data levels.
Technical Context
The SN74CB3T3257PWR implements four independent FET-based analog switches controlled by a single active-low OE and shared S select line, enabling 1-of-2 routing per channel. Its rail-to-rail switching architecture supports bidirectional data flow with no direction pin, and output voltage translation tracks VCC to maintain logic compatibility across mixed-voltage domains.
Each switch features undershoot clamp diodes on all I/Os, operates over VCC = 2.3V–3.6V, and guarantees isolation during power-off via Ioff functionality that limits backflow current to ±10 µA. The device meets JESD 17 latch-up immunity (>250 mA) and JESD 22 ESD ratings (±2000 V HBM, ±1000 V CDM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables operation in 2.5V and 3.3V systems without external level shifters. |
| ON-State Resistance (rON) | 5 Ω typ - Minimizes signal attenuation and voltage drop across switched paths at ≤128 mA per channel. |
| I/O Voltage Range | 0 V to 5.5 V - Supports 5V-tolerant inputs/outputs regardless of VCC state, including during power-up/down. |
| Propagation Delay (tpd) | 0.15 ns at 2.5V - Near-zero delay enables high-speed bus switching up to 200 MHz. |
| Input/Output Capacitance (Cio(OFF)) | 5 pF typ - Reduces capacitive loading on source and load circuits, preserving signal integrity. |
| Ioff Leakage Current | ±10 µA max - Ensures safe partial-power-down operation with no damaging backflow when VCC = 0 V. |
| ESD Rating (HBM) | ±2000 V - Meets Class II human-body model requirements for robust handling in manufacturing and field use. |
Pinout & Package
TSSOP-16 (PW) package: 5.00 mm × 6.40 mm body, 0.65 mm pitch, surface-mount, lead-free (NIPDAU), moisture sensitivity level 1 (260°C peak reflow).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (S) | Select control input | Determines whether A port connects to B1 (S = L) or B2 (S = H); TTL/CMOS-compatible threshold. |
| 2–3, 5–6, 10–11, 13–14 (1B1/1B2, 2B1/2B2, 3B1/3B2, 4B1/4B2) | Data I/O terminals (B-side) | Bidirectional channels; each pair routes to corresponding A port when enabled; 5V-tolerant, clamped. |
| 4, 7, 9, 12 (1A, 2A, 3A, 4A) | Data I/O terminals (A-side) | Common ports for 4-bit bus; connect to B1 or B2 based on S; same voltage tolerance and clamping as B ports. |
| 8 (GND) | Ground reference | Primary return path for VCC and all I/O currents; must be low-impedance for noise suppression. |
| 15 (OE) | Active-low output enable | Disables all switches (high-Z) when high; ties to VCC via pullup for power-up isolation if needed. |
| 16 (VCC) | Supply voltage | Power source for internal FET gate drive; sets translation reference and logic thresholds; requires 0.1 µF local decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage translation tracking VCC | Enables seamless 5V→3.3V or 5V/3.3V→2.5V level shifting without external components or supply dependencies. |
| 5V-tolerant I/Os with VCC = 0 V | Allows hot-plug capability and system-level isolation during partial power-down, preventing damage from floating buses. |
| Bidirectional zero-delay switching | Supports full-duplex data flow (e.g., USB D+/D−) with no direction control pin and sub-nanosecond propagation. |
| Ioff partial-power-down protection | Guarantees <±10 µA leakage when unpowered, eliminating risk of backdrive current into powered subsystems. |
| Low 5 pF OFF-state capacitance | Minimizes crosstalk and signal degradation in high-density PCB layouts with adjacent high-speed traces. |
Applications
| USB Interface | Memory Interleaving |
|---|---|
|
Use Scenario: Switching USB 2.0 D+ and D− lines between two host controllers sharing one peripheral port. IC Role / Device Role / Timing Role: Bidirectional 1-of-2 analog switch providing hot-pluggable, 5V-tolerant signal routing with no timing skew. Use Value: Eliminates need for dual-port USB PHYs; maintains signal integrity with 5Ω rON and 5 pF Cio(OFF) across full 480 Mbps bandwidth. |
Use Scenario: Dynamically routing a 4-bit address/data bus between two SRAM banks in a microcontroller-based embedded system. IC Role / Device Role / Timing Role: Low-latency bus multiplexer enabling bank-select arbitration without wait states or glue logic. Use Value: Achieves <0.25 ns propagation delay at 3.3V, supporting >200 MHz bus toggling while isolating inactive memory banks. |
| Bus Isolation | Level Translation Bridge |
|
Use Scenario: Electrically isolating a 3.3V FPGA I/O bank from a 5V sensor interface during firmware updates or fault conditions. IC Role / Device Role / Timing Role: High-impedance disconnect switch activated by OE, with Ioff protection during VCC ramp-down. Use Value: Prevents backfeed into FPGA VCC rail; guarantees <±10 µA leakage and >250 mA latch-up immunity per JESD 17. |
Use Scenario: Translating signals between a 2.5V ASIC core and legacy 5V peripherals in industrial control modules. IC Role / Device Role / Timing Role: Voltage-tracking level shifter where VOH follows VCC (e.g., 2.5V out with 2.5V VCC, 3.3V out with 3.3V VCC). Use Value: Delivers rail-to-rail output swing without external biasing; supports 0.8V–5V logic families across all data I/Os. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3257PWR | Lower rON (3 Ω typ), higher ICC (50 µA max), identical pinout and function. | Better for ultra-low-loss, high-current (<128 mA) paths; less suitable for ultra-low-power sleep modes. | Choose SN74CBTLV3257PWR when minimizing ON-resistance is critical and quiescent current budget allows. |
| TS3A227EYZTR | 3.3V-only VCC range (1.65–3.6V), 0.7 Ω rON, integrated ESD protection (±8 kV HBM), different pinout. | Superior ESD robustness and lower rON, but lacks 5V-tolerance and mixed-voltage translation capability. | Choose TS3A227EYZTR for cost-sensitive, 3.3V-only designs requiring enhanced ESD resilience and minimal rON. |
Compared with SN74CB3T3257PWR, SN74CBTLV3257PWR offers lower conduction loss but higher static power, while TS3A227EYZTR provides stronger ESD protection and lower rON at the expense of 5V-tolerance and voltage translation flexibility-making SN74CB3T3257PWR optimal for mixed-voltage, hot-swap-critical applications.
Availability
SN74CB3T3257PWR is available at Aetrix Electronics and suitable for USB interface design, memory interleaving systems, and bus isolation circuits requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SN74CB3T3257PWR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and power efficiency.
The SN74CB3T3257PWR belongs to TI's CB3T bus switch family, engineered for high-speed, low-distortion signal routing in mixed-voltage digital systems-specifically targeting USB, memory, and industrial interface applications.
FAQ
What is the maximum signal frequency supported by the SN74CB3T3257PWR?
The SN74CB3T3257PWR is characterized for operation up to 200 MHz in typical applications. This limit derives from its 5Ω rON and 5 pF Cio(OFF), forming an RC time constant that preserves signal edge integrity. Performance remains stable across VCC = 2.3V–3.6V and ambient temperatures from –40°C to +85°C, provided layout follows TI's trace-length and decoupling guidelines.
Does the SN74CB3T3257PWR support true bidirectional signal flow without direction control?
Yes, the SN74CB3T3257PWR supports fully bidirectional data flow on all 4 channels without requiring a direction pin. Each FET switch operates symmetrically: when enabled, current and voltage pass equally from A to B or B to A. This makes SN74CB3T3257PWR ideal for differential pairs like USB D+/D− or bidirectional memory data lines.
How does the Ioff feature protect the SN74CB3T3257PWR during partial power-down?
The Ioff feature limits current backflow to ±10 µA max when VCC = 0 V, preventing damage to powered downstream circuitry. For SN74CB3T3257PWR, this means that even with 5V applied to B-side I/Os while VCC is off, no harmful current flows into the unpowered die-ensuring safe hot-swap and system-level power sequencing.
Can the SN74CB3T3257PWR translate 5V logic down to 2.5V outputs with VCC = 2.5V?
Yes, the SN74CB3T3257PWR provides output voltage translation that tracks VCC. With VCC = 2.5V, a 5V input on any B port produces a ~2.5V output on the corresponding A port, maintaining valid logic-high levels for 2.5V CMOS receivers. This behavior is confirmed in the Typical DC Voltage Translation Characteristics plot and Section 7.1.
What decoupling capacitor value is recommended for the SN74CB3T3257PWR VCC pin?
A 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (Pin 16) is required for stable operation of the SN74CB3T3257PWR. TI specifies this value to suppress high-frequency noise and transient current spikes during switching. Additional bulk capacitance (e.g., 1 µF) may be added in parallel if board-level noise exceeds specification limits.
SN74CB3T3257PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 4 x 2:1
- 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
SN74CB3T3257PWR FAQ
1.How can I place an order for SN74CB3T3257PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3T3257PWR 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 SN74CB3T3257PWR reliable?
The price and inventory of SN74CB3T3257PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3T3257PWR is usually 5 days.
3.What payment methods are accepted for SN74CB3T3257PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CB3T3257PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CB3T3257PWR?
SN74CB3T3257PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3T3257PWR 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 SN74CB3T3257PWR?
For technical support, including SN74CB3T3257PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3T3257PWR requirements.
6.How does Aetrix verify that SN74CB3T3257PWR is sourced from the original manufacturer or authorized distributors?
All SN74CB3T3257PWR 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 SN74CB3T3257PWR meets industry standards.
7.What is the process for return or replacement of SN74CB3T3257PWR?
All SN74CB3T3257PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3T3257PWR, 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 SN74CB3T3257PWR part is unused and in its original packaging.
Return procedure for SN74CB3T3257PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74CB3T3257PWR 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…
