My Inquiry
My Account
Texas Instruments SN74LVC1T45DCKRG4
- Part No.:
- SN74LVC1T45DCKRG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC1T45DCKRG4.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,257
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVC1T45 from Texas Instruments is a single-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.65V–5.5V domains, featuring configurable VCCA/VCCB rails, 3-state outputs, ±24mA drive at 3.3V, 4µA max ICC, and VCC isolation for robust partial-power-down operation in mixed-voltage I/O interfaces.
For engineers reviewing the SN74LVC1T45 datasheet, SN74LVC1T45 pinout, SN74LVC1T45 application, or SN74LVC1T45 equivalent, this page delivers verified electrical specs, NanoFree™ SC70-6 package details, DIR-controlled signal directionality, Ioff-enabled power sequencing safety, and real-world level-shifting use cases across industrial and embedded systems.
Technical Context
The SN74LVC1T45 implements a fully asynchronous, noninverting dual-rail architecture where A-port logic levels track VCCA (1.65V–5.5V) and B-port thresholds reference VCCB (1.65V–5.5V), enabling translation among 1.8V, 2.5V, 3.3V, and 5V nodes without external components. DIR input is referenced solely to VCCA, decoupling control logic from B-side supply.
VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB = GND, while Ioff circuitry limits leakage to ±2µA over –40°C to +85°C, supporting safe hot-insertion and multi-rail power-down sequences without backfeed current or bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - enables direct interface between any common logic families (1.8V ↔ 3.3V, 2.5V ↔ 5V, etc.) without level-shifters or resistors |
| Max Data Rate | 420Mbps (3.3V→5V) - supports high-speed serial links like UART, SPI clock lines, and GPIO expansion in compact designs |
| Output Drive | ±24mA at 3.3V - sufficient to drive multiple CMOS loads or moderate capacitive traces without buffering |
| Ioff Leakage | ±2µA max - prevents damaging current flow during partial power-down, critical for battery-backed or hot-swap subsystems |
| Propagation Delay | 0.7ns min / 17.7ns max (A↔B) - deterministic timing for synchronous data handshaking with minimal skew |
| ESD Rating | ±2000V HBM - meets industrial handling requirements without additional protection circuitry |
| ICC Quiescent | 4µA max - enables ultra-low-power operation in always-on sensor or control interfaces |
Pinout & Package
SN74LVC1T45DCKRG4 uses the SC70-6 (DCK) package: 2.0mm × 2.1mm, 0.65mm pitch, 6-pin surface-mount with exposed pad not present. Pin numbering follows TI standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCCA | Power supply for A port and DIR input | Defines A-side logic thresholds and powers direction control; must be stable before signal assertion |
| 2 - GND | Reference ground | Common return path for both ports; requires low-inductance connection to minimize noise coupling |
| 3 - A | Bidirectional I/O (A port) | Signal terminal referenced to VCCA; output level swings 0V to VCCA, input threshold ~VCCA×0.35/0.65 |
| 4 - B | Bidirectional I/O (B port) | Signal terminal referenced to VCCB; output level swings 0V to VCCB, input threshold ~VCCB×0.35/0.65 |
| 5 - DIR | Direction control input | Low = B→A data flow; high = A→B data flow; referenced to VCCA, not VCCB |
| 6 - VCCB | Power supply for B port | Defines B-side logic thresholds; independent of VCCA, enabling true dual-voltage operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.65V–5.5V supplies on VCCA and VCCB enable seamless interoperability across 1.8V/2.5V/3.3V/5V logic domains |
| VCC isolation | Automatic high-Z on both ports if either VCCA or VCCB = GND - eliminates bus contention during asymmetric power sequencing |
| Ioff partial-power-down support | Sub-2µA leakage per pin when unpowered - allows safe integration into systems with staggered rail activation |
| NanoFree™ packaging | Die-as-package SC70-6 footprint (2.0mm × 2.1mm) - maximizes board density for space-constrained portable and IoT endpoints |
| Glitch-free power sequencing | No required ramp order or rate between VCCA and VCCB - simplifies power management design and eliminates false toggles |
Applications
| Industrial PLC I/O Modules | Portable Medical Sensors |
|---|---|
Use Scenario: Interfacing 3.3V microcontroller GPIOs to legacy 5V fieldbus peripherals (e.g., RS-485 transceivers, relay drivers) in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level translator managing command/response traffic between MCU and 5V actuator subsystems with precise DIR-controlled direction switching. Use Value: Eliminates discrete resistor-divider networks or dedicated level-shifter ICs, reducing BOM count and PCB area while maintaining 420Mbps headroom for future firmware upgrades. | Use Scenario: Connecting ultra-low-power 1.8V biosensor ASICs to 2.5V or 3.3V wireless SoC hosts in wearable ECG or glucose monitors. IC Role / Device Role / Timing Role: Voltage-domain bridge enabling reliable data transfer across mixed-supply subsystems with sub-4µA quiescent current preserving battery life. Use Value: Ioff and VCC isolation prevent sensor node reset during host sleep/wake cycles, ensuring uninterrupted physiological data capture without external power-gating logic. |
| Automotive Body Control Units | Enterprise SSD Controller Interfaces |
Use Scenario: Translating signals between 5V CAN transceiver status lines and 3.3V microcontroller GPIOs in body electronics modules operating across extended temperature range. IC Role / Device Role / Timing Role: Robust level shifter with ±2000V HBM ESD protection and –40°C to +85°C guaranteed operation for automotive-grade reliability. Use Value: Replaces larger SOIC solutions with SC70-6 footprint, easing routing in dense BCM layouts while meeting ISO 10605 discharge immunity requirements. | Use Scenario: Bridging 1.2V NVMe controller I/Os to 1.8V NAND flash memory buses in enterprise solid-state drives requiring high-speed, low-skew signaling. IC Role / Device Role / Timing Role: Low-latency (≤7.2ns typical tPLH) bidirectional translator supporting burst-mode read/write operations without timing violations. Use Value: Enables direct integration of heterogeneous memory technologies without custom ASIC-level translation, accelerating SSD firmware development and qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0101DCKR | Auto-direction sensing (no DIR pin); lower drive (±2mA); higher ICC (10µA) | Suitable for open-drain or push-pull buses with automatic direction detection; not for DIR-controlled synchronous protocols | Select TXS0101DCKR only when direction is inferred from bus activity, not controlled by MCU GPIO |
| SN74AVC1T45DCKR | Faster propagation (≤3.9ns typ); tighter VCC range (1.2V–3.6V); no VCC isolation | Better for high-speed 1.8V/2.5V/3.3V-only systems; unsuitable for 5V interfaces or asymmetric power-down scenarios | Choose SN74AVC1T45DCKR when maximum speed is critical and 5V compatibility or VCC isolation is unnecessary |
Compared with TXS0101DCKR and SN74AVC1T45DCKR, SN74LVC1T45DCKRG4 uniquely balances wide voltage support (1.65V–5.5V), explicit DIR control for deterministic protocol alignment, VCC isolation for fault-tolerant power sequencing, and industry-standard ESD robustness - making it optimal for mixed-voltage embedded control where reliability and flexibility outweigh raw speed.
Availability
SN74LVC1T45DCKRG4 is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, automotive body electronics, and enterprise storage systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature and voltage corners.
Supply support for SN74LVC1T45DCKRG4 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 for industrial, automotive, and personal electronics markets.
The SN74LVC1T45 belongs to TI's LVC logic family, engineered for low-voltage, high-speed, mixed-supply interfacing in space-constrained and power-sensitive embedded systems - emphasizing robustness, configurability, and drop-in compatibility across voltage domains.
FAQ
What voltage ranges does the SN74LVC1T45DCKRG4 support on VCCA and VCCB?
The SN74LVC1T45DCKRG4 supports independent 1.65V to 5.5V operation on both VCCA and VCCB rails. This allows translation between any combination of common logic voltages - including 1.8V ↔ 3.3V, 2.5V ↔ 5V, and 1.8V ↔ 5V - without external components. Each supply must remain within its specified range during operation to ensure valid logic thresholds and output swing compliance.
How does the DIR pin control data direction in the SN74LVC1T45DCKRG4?
In the SN74LVC1T45DCKRG4, the DIR pin is referenced to VCCA. When DIR = HIGH (≥VCCA × 0.65), data flows from the A port to the B port; when DIR = LOW (≤VCCA × 0.35), data flows from the B port to the A port. The A and B ports remain active inputs at all times, so proper bus arbitration and timing coordination with the DIR signal is essential to avoid contention in bidirectional configurations.
Does the SN74LVC1T45DCKRG4 support partial power-down, and how is it implemented?
Yes, the SN74LVC1T45DCKRG4 supports partial power-down via its Ioff feature. When either VCCA or VCCB is at 0V, the Ioff circuitry disables all outputs and limits leakage current to ±2µA per pin over –40°C to +85°C. This prevents backflow current into unpowered rails, protecting downstream circuitry and enabling safe hot-swap or staggered power sequencing - a key capability confirmed in the device's Electrical Characteristics table.
What is the maximum data rate achievable with the SN74LVC1T45DCKRG4, and under what conditions?
The SN74LVC1T45DCKRG4 achieves up to 420Mbps when translating from 3.3V to 5V (VCCA = 3.3V, VCCB = 5V), as specified in the Features section and validated in Switching Characteristics Table 5.6. Lower rates apply for other combinations: 210Mbps (to 3.3V), 140Mbps (to 2.5V), and 75Mbps (to 1.8V). These values reflect guaranteed maximums under recommended operating conditions, not typical lab measurements.
Is the SN74LVC1T45DCKRG4 compatible with the SC70-6 (DCK) package footprint used by other TI logic devices?
Yes, the SN74LVC1T45DCKRG4 uses the standardized TI SC70-6 (DCK) package: 2.0mm × 2.1mm body, 0.65mm lead pitch, and identical pinout (VCCA-GND-A-B-DIR-VCCB) as documented in Figure 4-2 and Table 4-1. This enables direct PCB footprint reuse across TI's single-bit translators, simplifying design migration and inventory consolidation without layout changes.
SN74LVC1T45DCKRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 1
- Voltage - VCCA:
- 1.65 V ~ 5.5 V
- Voltage - VCCB:
- 1.65 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Tri-State, Non-Inverted
- Data Rate:
- 420Mbps
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TSSOP, SC-88, SOT-363
SN74LVC1T45DCKRG4 FAQ
1.How can I place an order for SN74LVC1T45DCKRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC1T45DCKRG4 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 SN74LVC1T45DCKRG4 reliable?
The price and inventory of SN74LVC1T45DCKRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC1T45DCKRG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC1T45DCKRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC1T45DCKRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC1T45DCKRG4?
SN74LVC1T45DCKRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC1T45DCKRG4 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 SN74LVC1T45DCKRG4?
For technical support, including SN74LVC1T45DCKRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC1T45DCKRG4 requirements.
6.How does Aetrix verify that SN74LVC1T45DCKRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC1T45DCKRG4 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 SN74LVC1T45DCKRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC1T45DCKRG4?
All SN74LVC1T45DCKRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC1T45DCKRG4, 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 SN74LVC1T45DCKRG4 part is unused and in its original packaging.
Return procedure for SN74LVC1T45DCKRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVC1T45DCKRG4 Tags
-
74LVC1T45GW,125
Nexperia USA Inc.
-
74LVCH2T45DC,125
Nexperia USA Inc.
-
SN74LVC1T45DBVR
Texas Instruments
-
SN74LVC1T45DRLR
Texas Instruments
-
SN74LVC1T45DPKR
Texas Instruments
-
SN74LVC2T45DCTR
Texas Instruments
-
74LVC2T45GT,115
Nexperia USA Inc.
-
SN74LVC1T45YZPR
Texas Instruments
-
LSF0102DCUR
Texas Instruments
-
SN74LVC1T45DCKR
Texas Instruments
-
TXS0102DCTR
Texas Instruments
-
FXLP34P5X
onsemi
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…
