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Texas Instruments SN74LXC2T45DTMR
- Part No.:
- SN74LXC2T45DTMR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LXC2T45DTMR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8X2SON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LXC2T45 from Texas Instruments is a dual-bit, dual-supply noninverting bidirectional bus transceiver with configurable level shifting. It supports independent 1.1 V–5.5 V operation on both A and B ports, delivers up to 420 Mbps data rate (3.3 V → 5.0 V), features Schmitt-trigger inputs for noise immunity, and includes integrated dynamic pull-downs and static pull-downs on control inputs - enabling robust interfacing between mixed-voltage domains in automotive ADAS fusion and infotainment head units.
For engineers reviewing the SN74LXC2T45 datasheet, SN74LXC2T45 pinout, SN74LXC2T45 application, or SN74LXC2T45 equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-chain support details specific to the SN74LXC2T45 DTMR package - including its 8-pin X2SON footprint, VCCA/VCCB rail isolation behavior, and Ioff-float partial-power-down functionality.
Technical Context
The SN74LXC2T45 implements a fully configurable dual-rail architecture where A-port signals (A1, A2, DIR) are referenced to VCCA and B-port signals (B1, B2) to VCCB, enabling bidirectional voltage translation without external logic. Its direction control (DIR) is tied exclusively to VCCA, and internal Schmitt triggers on all I/Os ensure reliable operation with slow or noisy edges.
VCC isolation and Ioff-float functionality activate when either VCCA or VCCB drops below 100 mV: all I/Os first pull down, then enter high-impedance state - preventing back-drive and enabling true partial-power-down mode. This behavior is hardware-enforced and requires no external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA / VCCB) | 1.1 V to 5.5 V each - enables direct interface between sub-1.2 V logic and 5 V systems without level-shifter staging. |
| Max Data Rate | 420 Mbps (3.3 V → 5.0 V up-translation) - supports high-speed serial control links like I²C clock stretching or GPIO expansion in automotive ECUs. |
| Propagation Delay (tpd) | 12 ns typical (VCCA = 3.3 V, VCCB = 5.0 V, –40°C to 125°C) - ensures timing-critical signal integrity in real-time sensor fusion paths. |
| Ioff Current | ≤2.5 µA at –40°C to 125°C - guarantees ultra-low leakage during power sequencing or sleep states in battery-backed modules. |
| ESD Rating | ±4000 V HBM, ±1000 V CDM - meets automotive-grade robustness requirements per ISO 10605 and AEC-Q100 stress test profiles. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood and display module environments per AEC-Q100 Grade 1. |
| Output Drive Strength | 32 mA at 5 V - sufficient to directly drive LEDs, small solenoids, or capacitive loads up to 20 pF without buffering. |
Pinout & Package
SN74LXC2T45 DTMR uses the 8-pin X2SON (DTM) package: 1.35 mm × 0.80 mm, 0.4 mm pitch, wettable flank terminals. Thermal resistance RθJA = 205.7°C/W enables compact placement near hot components without derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply reference | Bias source for A1, A2, and DIR inputs; must be stable before enabling data flow. |
| A1, A2 | Configurable I/O (A-side) | Bi-directional data pins referenced to VCCA; tolerate 0–5.5 V input regardless of VCCA setting. |
| VCCB | B-port supply reference | Bias source for B1 and B2; independent of VCCA - enables asymmetric voltage translation (e.g., 1.8 V ↔ 3.3 V). |
| B1, B2 | Configurable I/O (B-side) | Bi-directional data pins referenced to VCCB; support over-voltage tolerant inputs up to 5.5 V. |
| DIR | Direction control input | Logic-high enables A→B transmission; logic-low enables B→A; referenced solely to VCCA, not VCCB. |
| GND | Common return path | Single ground connection required - no separate analog/digital GND needed. |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-free power supply sequencing | Eliminates output glitches during VCCA/VCCB ramp-up/down - no external POR or sequencer required. |
| VCC isolation & Ioff-float | Automatically forces all I/Os into high-Z when either supply falls below 100 mV - prevents back-powering and bus contention. |
| Schmitt-trigger inputs | Provides 0.2–1.06 V hysteresis across supply range - rejects noise on long traces or mechanical switch bounce without RC filters. |
| Integrated dynamic pull-downs | Reduces external BOM count by eliminating discrete 10–100 kΩ pull-down resistors on A/B I/O lines. |
| Static pull-down on DIR | Permits floating DIR pin during system boot - default low state ensures B→A direction until firmware asserts control. |
Applications
| ADAS Sensor Fusion Hub | Infotainment Head Unit |
|---|---|
Use Scenario: Interfacing 1.2 V camera sensor MIPI D-PHY control lines with 3.3 V MCU GPIOs in a surround-view ECU. IC Role / Device Role / Timing Role: Bidirectional level translator managing I²C configuration and status polling between heterogeneous voltage domains. Use Value: Enables direct sensor integration without adding delay or jitter - propagation delay ≤13 ns preserves timing margins for frame sync signals. |
Use Scenario: Connecting 1.8 V touch controller outputs to 5 V display backlight driver enable lines. IC Role / Device Role / Timing Role: Voltage-translating GPIO expander with Schmitt-triggered inputs to suppress EMI-induced false touches. Use Value: Integrated pull-downs eliminate 4 external resistors; 420 Mbps capability exceeds required toggle rate for PWM dimming control. |
| Mechanical Switch Debouncing | Automotive Gateway Module |
Use Scenario: Conditioning push-button inputs from 12 V vehicle harness into 1.5 V microcontroller interrupt pins. IC Role / Device Role / Timing Role: Level-shifting buffer with hysteresis and internal pull-downs replacing RC+Schmitt discrete solution. Use Value: Eliminates 2×RC networks and 2×inverters per switch - reduces board area by >3 mm² per channel and improves ESD robustness. |
Use Scenario: Isolating CAN transceiver logic-level signals (3.3 V) from 5 V power management ICs in a multi-domain gateway. IC Role / Device Role / Timing Role: Dual-rail translator enforcing VCCB-powered B-port isolation during VCCA brownout events. Use Value: Ioff-float behavior prevents CAN bus corruption when one domain powers down - critical for ASIL-B functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXB0102RGTR | 2-bit auto-direction sensing; no DIR pin; lower max speed (100 Mbps); higher ICC (15 µA typ) | Best for simple bidirectional buses (e.g., I²C) where direction is data-driven, not control-driven | Select SN74LXC2T45 when DIR-controlled direction, >100 Mbps, or ultra-low Ioff (<3 µA) is required. |
| SN74AVC2T244RSWR | Non-inverting dual-channel buffer; single-supply only (1.2–3.6 V); no level shifting; 32 mA drive | Only suitable for same-voltage domain buffering - cannot translate between disparate rails | Choose SN74LXC2T45 when cross-voltage domain communication (e.g., 1.8 V ↔ 5 V) is mandatory. |
Compared with TXB0102RGTR and SN74AVC2T244RSWR, the SN74LXC2T45 uniquely combines explicit DIR control, dual-rail independence, 420 Mbps throughput, and <3 µA Ioff - making it the only option among the three that satisfies simultaneous high-speed, low-leakage, and asymmetric voltage translation requirements in automotive safety-critical modules.
Availability
SN74LXC2T45 is available at Aetrix Electronics and suitable for automotive ADAS fusion, infotainment head units, and gateway modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for SN74LXC2T45 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 deep automotive and industrial design expertise.
The SN74LXC2T45 belongs to TI's LXC logic family - engineered specifically for low-voltage, mixed-rail system interfacing in automotive and industrial applications where power sequencing resilience and ESD robustness are non-negotiable.
FAQ
What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of the SN74LXC2T45?
The SN74LXC2T45 supports any combination of VCCA and VCCB within 1.1 V to 5.5 V - meaning the voltage difference can be up to 4.4 V (e.g., VCCA = 1.1 V, VCCB = 5.5 V). This full-range independence is confirmed in Section 6.3 Recommended Operating Conditions and Figure 6-6 of the SN74LXC2T45 datasheet, enabling use cases like 1.2 V MCU ↔ 5 V peripheral bridging without external regulators.
Does the SN74LXC2T45 require external pull-up or pull-down resistors on its I/O pins?
No - the SN74LXC2T45 integrates dynamic pull-down resistors on all A1, A2, B1, and B2 I/Os, and a static pull-down on the DIR input. These eliminate the need for external resistors in most configurations, reducing BOM count and PCB area. The pull-down strength is designed to hold lines low during floating conditions while allowing clean switching when driven - verified in Electrical Characteristics Table 6.5 (II parameter).
How does the SN74LXC2T45 behave during power loss on one supply rail?
When either VCCA or VCCB drops below 100 mV, the SN74LXC2T45 activates its Ioff-float feature: all I/Os first pull down, then transition to high-impedance state. This prevents back-driving, bus contention, or latch-up in partially powered systems - a hardware-enforced behavior documented in Section 10 of the SN74LXC2T45 datasheet and validated per JESD78 Class II latch-up testing.
Can the SN74LXC2T45 be used for unidirectional level translation?
Yes - the SN74LXC2T45 operates unidirectionally when DIR is held static (high for A→B, low for B→A). Its bidirectional capability does not compromise unidirectional performance: propagation delay, drive strength, and noise immunity remain identical. This flexibility allows reuse across both uni- and bi-directional interfaces in the same platform - confirmed in Device Functional Modes (Section 16) and switching characteristics tables.
Is the SN74LXC2T45 compliant with AEC-Q100 for automotive applications?
The SN74LXC2T45 is not individually AEC-Q100 qualified, but it is built on TI's automotive-capable process and meets key automotive stress requirements: operating temperature range (–40°C to +125°C), latch-up immunity (>100 mA per JESD78 Class II), and ESD robustness (±4000 V HBM). System-level qualification per AEC-Q100 is the responsibility of the end customer - as stated in TI's official SN74LXC2T45 product folder and Production Data notice.
SN74LXC2T45DTMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LXC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 2
- Voltage - VCCA:
- 1.1 V ~ 5.5 V
- Voltage - VCCB:
- 1.1 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Push-Pull
- Data Rate:
- 420Mbps
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-XFDFN Exposed Pad
SN74LXC2T45DTMR FAQ
1.How can I place an order for SN74LXC2T45DTMR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LXC2T45DTMR 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 SN74LXC2T45DTMR reliable?
The price and inventory of SN74LXC2T45DTMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LXC2T45DTMR is usually 5 days.
3.What payment methods are accepted for SN74LXC2T45DTMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LXC2T45DTMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LXC2T45DTMR?
SN74LXC2T45DTMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LXC2T45DTMR 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 SN74LXC2T45DTMR?
For technical support, including SN74LXC2T45DTMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LXC2T45DTMR requirements.
6.How does Aetrix verify that SN74LXC2T45DTMR is sourced from the original manufacturer or authorized distributors?
All SN74LXC2T45DTMR 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 SN74LXC2T45DTMR meets industry standards.
7.What is the process for return or replacement of SN74LXC2T45DTMR?
All SN74LXC2T45DTMR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LXC2T45DTMR, 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 SN74LXC2T45DTMR part is unused and in its original packaging.
Return procedure for SN74LXC2T45DTMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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