My Inquiry
My Account
Texas Instruments SN74LVC1T45YEPR
- Part No.:
- SN74LVC1T45YEPR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC1T45YEPR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 6DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,795
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVC1T45YEPR from Texas Instruments is a single-bit dual-supply bus transceiver enabling bidirectional voltage translation between 1.65V–5.5V domains, featuring 3-state outputs, ±24mA drive at 3.3V, 4µA max ICC, and VCC isolation. It serves in low-voltage interconnects between mixed-voltage SoCs, FPGAs, and peripherals in portable electronics and industrial controllers.
For engineers reviewing the SN74LVC1T45YEPR datasheet, SN74LVC1T45YEPR pinout, SN74LVC1T45YEPR application, or SN74LVC1T45YEPR equivalent, key selection criteria include configurable dual-rail operation, Ioff partial-power-down support, DIR-referenced-to-VCCA control logic, high-speed translation up to 420Mbps (3.3V→5V), and NanoFree™ DSBGA package compatibility with space-constrained PCB layouts.
Technical Context
The SN74LVC1T45YEPR implements asynchronous bidirectional data flow controlled solely by the DIR input referenced to VCCA. Its dual-rail architecture isolates A-port logic levels (tracking VCCA) from B-port thresholds (tracking VCCB), enabling translation across 1.8V/2.5V/3.3V/5V nodes without level-shifter ICs or discrete solutions.
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 during partial power-down-critical for battery-backed subsystems and hot-swap interfaces where supply sequencing is uncontrolled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - enables translation between any pair of common logic rails (1.8V↔2.5V, 2.5V↔3.3V, 3.3V↔5V) without external biasing |
| Max Data Rate | 420Mbps (3.3V→5V) - supports high-throughput peripheral bridging such as USB PHY interface or FPGA I/O expansion |
| Output Drive | ±24mA at 3.3V - drives standard CMOS loads with fast edge rates and minimal signal degradation over short traces |
| Ioff Leakage | ±2µA max at –40°C to +85°C - prevents back-current during system sleep modes or isolated domain power cycling |
| Propagation Delay | 0.5ns to 17.7ns (A↔B) - varies with VCCA/VCCB combination; sub-2ns delay at 5V→5V enables timing-critical control path use |
| ESD Rating | ±2000V HBM - meets industrial-grade robustness requirements for handheld and field-deployable equipment |
| Operating Temp | –40°C to +85°C - qualified for extended-temperature embedded applications including motor control and sensor hubs |
Pinout & Package
SN74LVC1T45YEPR uses the YZP (DSBGA, 6-pin) package: 1mm × 0.5mm, bottom-terminal, ultra-compact die-size package ideal for wearables and miniaturized modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A | I/O port referenced to VCCA | Transmits/receives data on System-1 side; output voltage swing tracks VCCA; input threshold defined by VCCA |
| B | I/O port referenced to VCCB | Transmits/receives data on System-2 side; output voltage swing tracks VCCB; input threshold defined by VCCB |
| DIR | Direction control input | Referenced to VCCA; low = B→A data flow, high = A→B data flow; no internal pullup/pulldown |
| VCCA | Power supply for A port and DIR | Must be present for DIR functionality and A-port operation; powers internal logic sensing DIR state |
| VCCB | Power supply for B port | Enables B-port I/O; absence forces B port into high-Z regardless of DIR state due to VCC isolation |
| GND | Common reference ground | Single ground connection required; all internal logic and I/O share this reference plane |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.65V–5.5V supplies per port enable interoperability across legacy and modern logic families without external resistors or regulators |
| VCC isolation | Automatic high-impedance on both ports if either VCCA or VCCB drops to GND - eliminates need for external isolation switches in multi-rail systems |
| Ioff partial-power-down | Prevents current backflow into powered-down domains; supports safe hot-plug and battery-save modes in portable devices |
| NanoFree™ DSBGA packaging | 1mm × 0.5mm footprint with bottom terminals reduces board area >70% vs. SOT-23; eliminates wirebond parasitics for cleaner signal integrity |
| Glitch-free power sequencing | No supply ramp order or rate constraints - VCCA and VCCB may power up/down independently without spurious output transitions |
Applications
| Industrial Sensor Interface | Wearable MCU Peripherals |
|---|---|
Use Scenario: Connecting a 1.8V MEMS sensor to a 3.3V microcontroller in a factory-floor vibration monitor. IC Role / Device Role / Timing Role: Bidirectional level translator handling I²C clock/data lines with direction switching synchronized to MCU read/write cycles. Use Value: Eliminates external pull-up resistors per rail and avoids timing skew from RC-based translation, preserving I²C timing margins at 400kHz. |
Use Scenario: Interfacing a 5V GPS module to a 1.8V Bluetooth SoC in a fitness tracker. IC Role / Device Role / Timing Role: Unidirectional translator (fixed DIR) converting GPS NMEA serial output (5V logic) to SoC UART input (1.8V). Use Value: Delivers clean 1.8V-compatible signals with <2ns propagation delay, avoiding start-bit misreads during high-baud-rate (9600–115.2k) operation. |
| FPGA I/O Expansion | Automotive Body Control Module |
Use Scenario: Extending a 3.3V FPGA bank to drive 5V automotive display backlight controls. IC Role / Device Role / Timing Role: Level-shifting buffer translating parallel GPIO commands from FPGA to 5V LED driver ICs. Use Value: ±24mA drive capability directly sources/sinks LED enable lines without external transistors, reducing BOM count and layout complexity. |
Use Scenario: Isolating LIN bus transceiver (12V domain) from 3.3V microcontroller in door module ECU. IC Role / Device Role / Timing Role: Direction-controlled translator managing diagnostic command/response traffic between MCU and LIN PHY. Use Value: VCC isolation ensures LIN-side faults (e.g., short-to-battery) do not disrupt MCU power domain, meeting ISO 11898-3 fault containment requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXB0101RGTR | Auto-direction sensing (no DIR pin); higher ICC (10µA typ); supports 1.2V–3.6V only | Eliminates direction-control logic but adds capacitive loading; unsuitable for 5V translation or deterministic DIR timing | Choose TXB0101RGTR only for simple push-pull buses where direction is inherently detectable (e.g., I²C) and 5V domains are absent |
| SN74AVC1T45DBVR | Same pinout (SOT-23-6); lower drive (±12mA); 1.2V–3.6V VCC range; no VCC isolation | Compatible footprint but lacks 5V support and failsafe isolation - requires external power-good monitoring | Use SN74AVC1T45DBVR only in cost-sensitive 3.3V↔1.8V applications where board space allows SOT-23 and isolation is managed externally |
Compared with TXB0101RGTR and SN74AVC1T45DBVR, SN74LVC1T45YEPR uniquely combines 5V tolerance, VCC isolation, and DIR-controlled determinism - making it the only choice for safety-critical or mixed-voltage industrial designs requiring guaranteed high-Z behavior during supply faults.
Availability
SN74LVC1T45YEPR is available at Aetrix Electronics and suitable for industrial sensor interfaces, wearable MCU peripherals, FPGA I/O expansion, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and DSBGA package compatibility.
Supply support for SN74LVC1T45YEPR 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 SN74LVC1T45YEPR belongs to TI's LVC logic family, engineered for low-voltage bidirectional translation in space- and power-constrained systems where mixed-supply interoperability and supply-fault resilience are mandatory.
FAQ
What is the function of the DIR pin on the SN74LVC1T45YEPR?
The DIR pin on the SN74LVC1T45YEPR controls data direction: when DIR is high (referenced to VCCA), data flows from A port to B port; when DIR is low, data flows from B port to A port. It has no internal pullup or pulldown, so external biasing is required for deterministic startup states. This explicit control enables predictable timing in synchronous protocols like SPI or parallel GPIO expansion.
Does the SN74LVC1T45YEPR support 5V operation on both VCCA and VCCB?
Yes, the SN74LVC1T45YEPR supports 5V operation on both VCCA and VCCB simultaneously, with full specification across the 1.65V–5.5V range per supply. At 5V/5V, it delivers sub-2ns propagation delay and ±32mA output drive - making SN74LVC1T45YEPR suitable for high-speed 5V logic interfacing where legacy and modern systems coexist.
How does VCC isolation work in the SN74LVC1T45YEPR?
VCC isolation in the SN74LVC1T45YEPR forces both A and B ports into high-impedance whenever either VCCA or VCCB is at GND - even if the other supply is active. This prevents back-driving and latch-up during partial power-down or supply fault conditions. The feature is intrinsic to the silicon design and requires no external components to activate.
Can the SN74LVC1T45YEPR be used in I²C applications?
Yes, the SN74LVC1T45YEPR can be used in I²C applications as a unidirectional or bidirectional translator, but requires careful timing and external pull-up resistors on each side. Unlike auto-sensing translators, its DIR pin must be actively controlled - typically tied high for SDA/SCL up-translation (e.g., 1.8V MCU → 3.3V sensor), with SN74LVC1T45YEPR ensuring rail-to-rail voltage compliance and sub-10ns edge fidelity.
What is the thermal performance of the SN74LVC1T45YEPR in its YZP package?
In the YZP (DSBGA, 6-pin) package, the SN74LVC1T45YEPR achieves a junction-to-board thermal resistance (RθJB) of 22.6°C/W - significantly lower than SOT-23 (96.6°C/W) or SC70 (72°C/W) variants. This enables reliable operation at full drive strength in thermally dense layouts, such as stacked PCBs in medical wearables, without derating or heatsinking.
SN74LVC1T45YEPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-XFBGA, DSBGA
SN74LVC1T45YEPR FAQ
1.How can I place an order for SN74LVC1T45YEPR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC1T45YEPR 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 SN74LVC1T45YEPR reliable?
The price and inventory of SN74LVC1T45YEPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC1T45YEPR is usually 5 days.
3.What payment methods are accepted for SN74LVC1T45YEPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC1T45YEPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC1T45YEPR?
SN74LVC1T45YEPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC1T45YEPR 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 SN74LVC1T45YEPR?
For technical support, including SN74LVC1T45YEPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC1T45YEPR requirements.
6.How does Aetrix verify that SN74LVC1T45YEPR is sourced from the original manufacturer or authorized distributors?
All SN74LVC1T45YEPR 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 SN74LVC1T45YEPR meets industry standards.
7.What is the process for return or replacement of SN74LVC1T45YEPR?
All SN74LVC1T45YEPR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC1T45YEPR, 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 SN74LVC1T45YEPR part is unused and in its original packaging.
Return procedure for SN74LVC1T45YEPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVC1T45YEPR 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…
