My Inquiry
My Account
Texas Instruments SN74CBTD3305CDR
- Part No.:
- SN74CBTD3305CDR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBTD3305CDR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,445
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74CBTD3305CDR from Texas Instruments is a dual 1-bit FET bus switch with integrated level shifting and −2-V undershoot protection, operating from 4.5 V to 5.5 V VCC. It enables bidirectional 5-V-to-3.3-V signal translation, features 3 Ω typical ON-state resistance, <0.15 ns propagation delay, and supports 0–5-V I/O signaling across 0.8-V to 5-V logic families. It is used in USB interface isolation and memory interleaving where low-distortion, fast-switching bus gating is required.
For engineers reviewing the SN74CBTD3305CDR datasheet, SN74CBTD3305CDR pinout, SN74CBTD3305CDR application, or SN74CBTD3305CDR equivalent, key selection criteria include its −2-V undershoot tolerance on A/B ports, Ioff partial-power-down support, 5-pF OFF-state I/O capacitance, TTL/CMOS-compatible control inputs, and SOIC-8 package compatibility with industrial temperature range (−40°C to 85°C).
Technical Context
The SN74CBTD3305CDR implements two independent FET-based transmission gates, each controlled by dedicated OE inputs (1OE, 2OE), enabling per-channel ON/OFF state control. Its internal diode-connected path to VCC enables passive 5-V-to-3.3-V level downshifting without external components.
Active undershoot-protection circuitry monitors A and B port voltages and forces switch disable when undershoot exceeds −2 V, preventing erroneous conduction during signal transients. The device supports Ioff, ensuring no backflow current during partial power-down, and meets JESD 78 Class II latch-up immunity (>100 mA) and JESD 22 HBM (2000 V) / CDM (1000 V) ESD ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V supply tolerances in industrial systems. |
| ron (Typ) | 3 Ω - Minimizes voltage drop and power loss during signal pass-through, critical for high-speed digital integrity. |
| tpd (Max) | 0.15 ns - Enables sub-nanosecond signal gating for high-frequency bus arbitration and timing-critical applications. |
| Cio(OFF) | 5 pF - Reduces capacitive loading on driven buses, preserving signal edge rates and minimizing crosstalk. |
| Undershoot Protection | −2 V on A/B ports - Prevents false switching and latch-up during negative transient events in hot-plug or noisy environments. |
| Ioff | 10 μA at VCC = 0 V - Blocks damaging back-current flow during system power sequencing or partial shutdown. |
| VI/O Range | 0 V to 5.5 V - Supports interoperability across 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families without level-shifter ICs. |
Pinout & Package
SN74CBTD3305CDR is housed in an 8-pin SOIC (D) package, 3.91 mm × 4.9 mm footprint, 1.75 mm max height, RoHS-compliant, with NIPDAU lead finish and moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Channel 1 Output Enable | Active-high control: drives 1A↔1B path ON when high; high-impedance isolation when low. |
| 1A | Channel 1 Data Input/Output A | Bidirectional terminal; connects to upstream logic or bus segment; clamped to −2 V undershoot limit. |
| 1B | Channel 1 Data Input/Output B | Bidirectional terminal; connects to downstream logic or bus segment; shares same undershoot protection as 1A. |
| GND | Ground Reference | System return path for VCC and all I/O; required for proper undershoot clamp diode biasing. |
| VCC | Positive Supply | 5-V supply input; powers internal FETs and undershoot protection circuitry; also feeds integrated level-shift diode. |
| 2OE | Channel 2 Output Enable | Independent active-high control for second switch channel; enables asynchronous gating of separate data paths. |
| 2B | Channel 2 Data Input/Output B | Bidirectional terminal; electrically identical to 1B; supports independent 2-bit bus or dual 1-bit isolation. |
| 2A | Channel 2 Data Input/Output A | Bidirectional terminal; matches 1A functionality; allows mirrored use case for second channel. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated VCC-referenced diode | Enables passive 5-V-to-3.3-V level shifting without external resistors or additional ICs, reducing BOM count and layout area. |
| −2-V undershoot protection | Hardware-enforced port disable during negative transients, eliminating need for external TVS diodes in USB or hot-swap interfaces. |
| Ioff partial-power-down support | Prevents back-current injection into powered-down subsystems, simplifying power sequencing in multi-rail embedded systems. |
| Low 5-pF OFF-state capacitance | Minimizes signal distortion and reflection on high-speed buses (e.g., memory address/data lines), preserving eye diagram integrity. |
| TTL/5-V & 3.3-V CMOS compatible controls | Accepts standard logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), enabling direct drive from legacy microcontrollers or FPGA I/O banks. |
Applications
| USB Interface Isolation | Memory Interleaving |
|---|---|
Use Scenario: Isolating USB 2.0 D+ and D− lines between host controller and peripheral during enumeration or suspend/resume transitions. IC Role / Device Role / Timing Role: Bidirectional analog switch providing hot-plug-safe signal gating with undershoot suppression and minimal propagation delay. Use Value: Prevents bus contention and ground bounce-induced corruption during plug/unplug events while maintaining full-speed USB timing margins. | Use Scenario: Dynamically routing address/data between two DDR SDRAM banks sharing a common controller bus. IC Role / Device Role / Timing Role: Dual 1-bit switch enabling time-multiplexed access to interleaved memory channels without signal degradation. Use Value: Delivers 3 Ω ON-resistance and 5-pF OFF-capacitance to preserve setup/hold timing and reduce inter-bank skew in high-bandwidth memory systems. |
| Bus Isolation in Industrial PLCs | Low-Distortion Signal Gating in Test Equipment |
Use Scenario: Electrically isolating field I/O bus segments from CPU backplane to prevent fault propagation in programmable logic controllers. IC Role / Device Role / Timing Role: Fail-safe bus switch with Ioff and −2-V undershoot tolerance, activated only during safe I/O configuration windows. Use Value: Eliminates need for optocouplers or relays in low-latency digital isolation, supporting deterministic scan-cycle timing under EMC stress. | Use Scenario: Gating precision analog or clock signals in automated test equipment where signal fidelity must be preserved across switching events. IC Role / Device Role / Timing Role: Low-capacitance, near-zero-delay transmission gate used for clean signal path enable/disable without added jitter or harmonic distortion. Use Value: Achieves <0.15 ns tpd and 5-pF Cio(OFF) to maintain sub-picosecond edge integrity in RF stimulus/response measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3244DBR | Octal non-inverting bus switch; no integrated level-shifting diode; 5-V only I/O; 6 Ω ron (typ); 6-pF Cio(OFF). | Lacks −2-V undershoot protection and 5-V-to-3.3-V translation; suited for pure 5-V bus isolation without level shift. | Select when only 5-V signaling is required and external level shifters are already present in design. |
| SN74AVC2T244RSWR | 2-bit dual-supply voltage translator; supports 1.2-V to 3.6-V on A-side, 1.65-V to 3.6-V on B-side; 3.5-Ω ron; no undershoot protection beyond standard I/O clamp. | Requires dual supplies; no −2-V undershoot rating; designed for low-voltage logic translation, not 5-V bus gating. | Choose for mixed-voltage SoC interfacing (e.g., 1.8-V FPGA to 3.3-V peripheral), not 5-V legacy bus isolation. |
Compared with SN74CBTD3305CDR, SN74CBT3244DBR offers higher channel count but lacks level shifting and undershoot hardening, while SN74AVC2T244RSWR provides flexible dual-rail translation at the cost of missing industrial-grade −2-V transient resilience and 5-V native support.
Availability
SN74CBTD3305CDR is available at Aetrix Electronics and suitable for USB interface isolation, memory interleaving, and industrial bus isolation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SOIC packaging.
Supply support for SN74CBTD3305CDR 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, longevity, and industrial-grade performance.
The SN74CBTD3305CDR belongs to TI's 74CBT family of high-speed CMOS bus switches, engineered specifically for low-distortion, level-shifting–capable digital signal routing in noise-prone, hot-plug–enabled systems.
FAQ
What is the maximum undershoot voltage the SN74CBTD3305CDR can withstand on its A and B ports?
The SN74CBTD3305CDR guarantees −2 V undershoot protection on both A and B ports when the switch is in the OFF state. This is enforced by internal active circuitry that detects sub-ground transients and forces the FET into high-impedance mode, preventing unintended conduction. This specification is validated per the absolute maximum ratings and undershoot characteristics table in the official TI datasheet SCDS126A.
Does the SN74CBTD3305CDR support level shifting from 5 V to 3.3 V without external components?
Yes, the SN74CBTD3305CDR integrates a diode-connected path to VCC that enables passive 5-V-to-3.3-V level downshifting on signal paths. When a 5-V signal is applied to the A port, the internal diode drops ~1.7 V, resulting in ~3.3 V at the B port under typical load conditions. No external resistors or translators are needed, as confirmed in the device description and level shifter test circuit (Figure 6) of the SCDS126A datasheet.
What is the ON-state resistance (ron) specification for the SN74CBTD3305CDR, and how does it affect signal integrity?
The SN74CBTD3305CDR has a typical ON-state resistance of 3 Ω at VCC = 4.5 V, with a maximum of 6 Ω. This low ron minimizes voltage drop and power dissipation during signal transmission, preserving logic high/low margins and reducing rise/fall time degradation-especially critical in high-speed parallel buses like memory address lines or USB data pairs where impedance matching and signal fidelity are essential.
Can the SN74CBTD3305CDR be used in partial-power-down applications?
Yes, the SN74CBTD3305CDR supports partial-power-down via its Ioff feature. When VCC = 0 V, the device limits OFF-state leakage to 10 μA maximum, preventing damaging back-current flow from live I/O lines into the unpowered device. This behavior is explicitly characterized in the electrical specifications table and enables safe use in systems with staggered power sequencing, such as multi-voltage industrial controllers.
What package type and dimensions does the SN74CBTD3305CDR use, and is it RoHS-compliant?
The SN74CBTD3305CDR uses the SOIC-8 (D) package: 3.91 mm × 4.9 mm body size, 1.75 mm max height, with 1.27 mm lead pitch. It is RoHS-compliant with NIPDAU lead finish and moisture sensitivity level 1 (MSL-1, 260°C peak reflow). Package mechanical data and land patterns are documented in TI's D0008A outline drawing and PCB design guidelines.
SN74CBTD3305CDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTD
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 1 x 1:1
- Independent Circuits:
- 2
- 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:
- 8-SOIC
SN74CBTD3305CDR FAQ
1.How can I place an order for SN74CBTD3305CDR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTD3305CDR 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 SN74CBTD3305CDR reliable?
The price and inventory of SN74CBTD3305CDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD3305CDR is usually 5 days.
3.What payment methods are accepted for SN74CBTD3305CDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTD3305CDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBTD3305CDR?
SN74CBTD3305CDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTD3305CDR 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 SN74CBTD3305CDR?
For technical support, including SN74CBTD3305CDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD3305CDR requirements.
6.How does Aetrix verify that SN74CBTD3305CDR is sourced from the original manufacturer or authorized distributors?
All SN74CBTD3305CDR 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 SN74CBTD3305CDR meets industry standards.
7.What is the process for return or replacement of SN74CBTD3305CDR?
All SN74CBTD3305CDR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD3305CDR, 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 SN74CBTD3305CDR part is unused and in its original packaging.
Return procedure for SN74CBTD3305CDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74CBTD3305CDR 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…
