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STMicroelectronics 74LVX3245TTR
- Part No.:
- 74LVX3245TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
74LVX3245TTR.pdf
- Description:
- IC TRNSLTR BIDIRECTIONAL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,685
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Product details
Overview
74LVX3245TTR from STMicroelectronics is an octal dual-supply bus transceiver enabling bidirectional level translation between 3.3V (A-port) and 5V (B-port) buses, with 8ns max propagation delay at 25°C, ±24mA symmetrical drive strength, and 2kV ESD immunity on all inputs. It is used in mixed-voltage industrial control backplanes where isolation and direction control via DIR/G pins are required.
For engineers reviewing the 74LVX3245TTR datasheet, 74LVX3245TTR pinout, 74LVX3245TTR application, or 74LVX3245TTR equivalent, key selection criteria include dual-rail voltage tolerance (2.7–3.6V / 4.5–5.5V), output enable/disable timing (tPZL/tPLZ ≤ 9.5ns), high-impedance isolation behavior, and TSSOP-24 package compatibility with space-constrained PCB layouts.
Technical Context
The device implements a CMOS-based bidirectional data path with independent directional control (DIR) and three-state enable (G), allowing asynchronous communication in either direction without clocking. Its dual VCCA/VCCB supplies decouple logic thresholds and output drive characteristics per port.
Input protection includes diode clamping and 2kV HBM ESD hardening; output stages deliver matched |IOH| = |IOL| ≥ 24mA under load, ensuring signal integrity across voltage domains. Propagation delays tPLH/tPHL are balanced within 1ns skew, supporting deterministic timing in synchronous bus interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPD) | 8ns max at VCCA=3.3V, VCCB=5.0V - enables 125MHz bus operation with margin |
| VCCA Operating Range | 2.7V to 3.6V - supports 3.3V systems with 10% tolerance and 1.2V data retention |
| VCCB Operating Range | 4.5V to 5.5V - compatible with standard 5V TTL/CMOS logic families |
| Output Drive Strength | ±24mA min - sustains clean edges driving 50Ω transmission lines or multiple loads |
| Quiescent Current (ICCA/ICCB) | 5µA / 8µA max - minimizes standby power in battery-backed or always-on subsystems |
| ESD Immunity | 2kV HBM - meets IEC 61000-4-2 Level 2 for industrial board-level robustness |
| Dynamic Output Noise (VOLP) | 0.3V typ at VCC=3.3V - reduces crosstalk and ground bounce in dense routing |
Pinout & Package
TSSOP-24 package: 7.7–7.9mm × 6.25–6.5mm body, 0.65mm pitch, 1.1mm height, lead-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | VCCA / VCCB | Separate 3.3V and 5V supply rails - must be decoupled independently to suppress cross-rail noise |
| 2 | DIR | Direction control input - HIGH enables A→B transfer; LOW enables B→A transfer |
| 22 | G | Active-low output enable - LOW activates transceiver; HIGH forces all I/Os into high-impedance state |
| 3–10 | A1–A8 | 3.3V-side bidirectional data terminals - interface directly with LVCMOS33 microcontrollers or FPGAs |
| 14–21 | B1–B8 | 5V-side bidirectional data terminals - connect to legacy 5V peripherals or ASICs without level-shifting buffers |
| 11–13 | GND | Dedicated ground pins - reduce ground bounce by separating return paths for A/B ports and supplies |
| 23 | NC | No-connect pin - must remain unconnected and unbonded per STMicroelectronics design |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Supports simultaneous 3.3V ↔ 5V bidirectional data flow without external resistors or direction logic |
| Matched propagation delays | tPLH ≈ tPHL ensures minimal duty-cycle distortion in clock-forwarding or strobe-synchronized applications |
| Low dynamic noise (VOLP) | 0.3V typical quiet-output noise reduces simultaneous switching output (SSO) effects in multi-bit buses |
| High-impedance isolation | G = HIGH places both A and B ports in Hi-Z - electrically isolates buses during power sequencing or fault conditions |
| Latch-up immunity | Enhanced C2MOS process prevents destructive latch-up even under overvoltage or hot-swap transients |
Applications
| Industrial PLC Backplane | Legacy Instrumentation Interface |
|---|---|
Use Scenario: Connecting modern 3.3V FPGA-based motion controllers to legacy 5V analog I/O modules in programmable logic controller racks. IC Role / Device Role / Timing Role: Bidirectional level-translating bus transceiver managing real-time sensor feedback and actuator command streams across voltage domains. Use Value: Eliminates need for discrete level shifters per line, reducing BOM count and PCB area while maintaining sub-10ns timing alignment for deterministic control loops. | Use Scenario: Interfacing a 3.3V ARM Cortex-M4 data acquisition unit with 5V RS-232 transceivers and analog front-end ICs in portable test equipment. IC Role / Device Role / Timing Role: Voltage-domain bridge enabling shared address/data bus access between mixed-supply subsystems without signal degradation. Use Value: Maintains 24mA drive capability at both rails to drive long traces and capacitive loads typical in modular instrument backplanes. |
| Automotive Body Control Module | Medical Diagnostic Imaging Subsystem |
Use Scenario: Integrating low-power 3.3V microcontroller units with existing 5V CAN physical layer transceivers and LIN bus peripherals in vehicle body electronics. IC Role / Device Role / Timing Role: Isolated bus transceiver providing direction-controlled data exchange between safety-critical and non-safety domains. Use Value: G-input enables safe bus shutdown during reset or fault recovery, meeting ISO 26262 ASIL-B functional safety requirements for controlled isolation. | Use Scenario: Linking 3.3V digital imaging processors to 5V CCD driver ICs and high-voltage analog multiplexers in ultrasound beamforming modules. IC Role / Device Role / Timing Role: High-speed, low-noise bidirectional translator preserving signal fidelity in time-critical echo sampling paths. Use Value: 0.3V typical VOLP minimizes ground bounce-induced jitter on sampling clocks routed adjacent to data lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal dual-supply bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC8T245RHLR | Single 1.65–5.5V supply; no separate VCCA/VCCB - requires external level-shifting for asymmetric rail use | Best suited for 3.3V↔5V translation only when both sides share common ground and moderate noise sensitivity | Select when board space is constrained and dual-rail independence is not required; verify VIH/VIL margins at edge voltages |
| TXB0108PWR | Auto-direction sensing; no DIR pin - relies on bus activity to detect direction; higher quiescent current (10µA vs 5µA) | Ideal for I²C/SPI where direction changes dynamically; unsuitable for static-direction parallel buses | Choose only for protocols with frequent direction reversal; avoid for fixed-direction data highways like memory-mapped peripherals |
Compared with SN74LVC8T245RHLR and TXB0108PWR, the 74LVX3245TTR uniquely provides explicit DIR/G control, true dual-rail independence, and lowest quiescent current - making it optimal for deterministic, low-power, mixed-voltage parallel bus architectures.
Availability
74LVX3245TTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and medical diagnostic imaging subsystems requiring stable component supply across extended temperature ranges (–55°C to +125°C).
Supply support for 74LVX3245TTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and power management ICs with strong European manufacturing and R&D infrastructure.
The 74LVX series targets low-voltage, high-speed logic interoperability in mixed-supply systems, emphasizing ESD robustness, low power, and precise timing for industrial and telecom infrastructure applications.
FAQ
What is the maximum allowable voltage difference between VCCA and VCCB?
VCCA and VCCB may operate at their full specified ranges simultaneously: VCCA = 2.7–3.6V and VCCB = 4.5–5.5V. The absolute maximum ratings allow VCCA up to +7.0V and VCCB up to +7.0V independently, but functional operation outside recommended ranges risks timing violation or increased leakage. No minimum differential is required - they may be equal if system design permits.
Can the 74LVX3245TTR drive a 50Ω transmission line directly?
Yes - its ±24mA output drive strength at 3.3V and 5V rails meets the current demand for driving 50Ω terminated lines at logic levels. At VCCB = 5V and IO = –24mA, VOHB remains ≥3.75V, satisfying TTL high-level margin; at VCCA = 3.3V and IO = 24mA, VOLA stays ≤0.44V, preserving LVCMOS33 low-level integrity.
Is Pin 23 (NC) required to be grounded or left floating?
Pin 23 is explicitly designated "Not Connected" in the STMicroelectronics datasheet and mechanical drawings. It must remain unconnected - neither grounded nor tied to any voltage. Internal bonding does not attach to this pad, and connecting it risks unintended current paths or package stress. PCB layout should omit solder mask and copper at this location.
How does the device behave during power sequencing when VCCA ramps before VCCB?
When VCCA is powered before VCCB, the A-port I/Os enter high-impedance state and remain inactive until VCCB reaches ≥1.2V (data retention threshold). Inputs are protected by clamp diodes, preventing damage from VCCB-related transients. Full functionality requires both supplies within recommended operating ranges; partial power-up states are safe but non-operational.
74LVX3245TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LVX
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 8
- Voltage - VCCA:
- 2.7 V ~ 3.6 V
- Voltage - VCCB:
- 4.5 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Tri-State, Non-Inverted
- Data Rate:
- -
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP (0.173", 4.40mm Width)
74LVX3245TTR FAQ
1.How can I place an order for 74LVX3245TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVX3245TTR 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 74LVX3245TTR reliable?
The price and inventory of 74LVX3245TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVX3245TTR is usually 5 days.
3.What payment methods are accepted for 74LVX3245TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVX3245TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVX3245TTR?
74LVX3245TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVX3245TTR 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 74LVX3245TTR?
For technical support, including 74LVX3245TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVX3245TTR requirements.
6.How does Aetrix verify that 74LVX3245TTR is sourced from the original manufacturer or authorized distributors?
All 74LVX3245TTR 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 74LVX3245TTR meets industry standards.
7.What is the process for return or replacement of 74LVX3245TTR?
All 74LVX3245TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVX3245TTR, 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 74LVX3245TTR part is unused and in its original packaging.
Return procedure for 74LVX3245TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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