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Nexperia USA Inc. 74LVC8T245BQ,118
- Part No.:
- 74LVC8T245BQ,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
74LVC8T245BQ,118.pdf
- Description:
- IC TRANSLATR TXRX 5.5V 24DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,404
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Product details
Overview
74LVC8T245BQ,118 from Nexperia is an 8-bit dual-supply translating transceiver with 3-state outputs enabling bidirectional level translation between 1.2 V and 5.5 V domains. It features independent VCC(A) and VCC(B) supplies, DIR-controlled data direction, OE-enabled bus isolation, and IOFF circuitry for partial power-down operation. Used in mixed-voltage system interconnects such as FPGA-to-ASIC I/O bridging, microcontroller peripheral expansion, and industrial sensor interface modules.
For engineers reviewing the 74LVC8T245BQ,118 datasheet, 74LVC8T245BQ,118 pinout, 74LVC8T245BQ,118 application, or 74LVC8T245BQ,118 equivalent, key selection criteria include dual-rail voltage flexibility (1.2–5.5 V per rail), 24-terminal DHVQFN package thermal performance, suspend-mode high-impedance behavior during power sequencing, and bus-hold capability on the 74LVCH8T245 variant.
Technical Context
This device implements a dual-supply CMOS transceiver architecture with separate input-reference domains: An, DIR, and OE pins are referenced to VCC(A); Bn pins are referenced to VCC(B). Direction control is synchronous and non-latched - data flow follows DIR state in real time without internal storage.
The IOFF circuit enforces output disable and leakage suppression when either VCC(A) or VCC(B) is at GND, ensuring robustness during hot-swap or asymmetric power-up sequences. The 74LVCH8T245 version adds active bus-hold circuitry on all A/B data terminals, eliminating external pull-ups for floating-input immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply range (VCC(A)/VCC(B)) | 1.2 V to 5.5 V each - enables translation across 1.2/1.5/1.8/2.5/3.3/5.0 V logic domains without level-shifter ICs |
| Max data rate | 420 Mbps (3.3 V → 5.0 V) - supports high-speed parallel bus bridging in real-time control systems |
| Propagation delay (An→Bn) | 5.4 ns typical at VCC(A)=3.3 V, VCC(B)=5.0 V - ensures timing closure in sub-10 ns critical paths |
| IOFF leakage | ±2 μA max at -40 °C to +125 °C - prevents backfeed current during partial power-down in battery-backed subsystems |
| Bus hold current (74LVCH8T245) | ±100 μA at VCCI=4.5 V - maintains valid logic states on un-driven lines without external resistors |
| ESD rating (HBM) | >4000 V - meets industrial IEC 61000-4-2 system-level robustness requirements |
| Operating temperature | -40 °C to +125 °C - qualified for under-hood automotive, motor drive, and industrial PLC applications |
Pinout & Package
DHVQFN24 package (SOT815-1): 3.5 mm × 5.5 mm × 0.85 mm body, 24-terminal leadless construction with exposed thermal pad; compatible with standard QFN reflow profiles and offers superior thermal resistance vs. TSSOP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–10 (A1–A8), 14–21 (B1–B8) | Data I/O ports | A-side pins referenced to VCC(A); B-side pins referenced to VCC(B); bidirectional flow controlled by DIR |
| 2 (DIR) | Direction control input | HIGH enables A→B transmission; LOW enables B→A; referenced to VCC(A) |
| 22 (OE) | Output enable (active LOW) | Drives all A/B outputs to high-impedance when HIGH; enables bus isolation in multi-master systems |
| 1, 11–13, 24 (GND) | Ground terminals | Multiple GND pins reduce ground bounce and improve signal integrity in high-speed switching |
| 23, 24 (VCC(B)), 12 (VCC(A)) | Supply rails | VCC(A) powers A-port logic and DIR/OE inputs; VCC(B) powers B-port logic; independent regulation required |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply translation | Independent 1.2–5.5 V rails per port eliminate need for discrete level-shifting components in heterogeneous SoC interfaces |
| IOFF partial power-down | Automatic high-Z output and <±2 μA leakage when either VCC is at GND - simplifies power sequencing in modular systems |
| Suspend mode | Both A and B ports enter high-impedance OFF-state if VCC(A) = GND or VCC(B) = GND - prevents bus contention during fault conditions |
| Bus-hold circuitry (74LVCH8T245) | Active input retention at ±100 μA drive strength - removes requirement for external pull-up/down resistors on unused data lines |
| High noise immunity | Meets JEDEC standards JESD8-7, JESD8-5, JESD8C, JESD36 - validated for reliable operation in electrically noisy factory environments |
Applications
| Industrial PLC Backplane Interface | FPGA-to-Microcontroller I/O Expansion |
|---|---|
Use Scenario: Connecting 3.3 V FPGA I/O banks to legacy 5.0 V sensor acquisition modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing data flow between mismatched logic families while maintaining sub-10 ns propagation delay. Use Value: Eliminates discrete MOSFET-based level shifters, reduces BOM count by 8×, and guarantees timing predictability across temperature (-40 °C to +125 °C). |
Use Scenario: Expanding GPIO count of an ARM Cortex-M7 MCU (1.8 V I/O) to drive 2.5 V display controller and 3.3 V SD card interface. IC Role / Device Role / Timing Role: Dual-rail transceiver enabling simultaneous translation from 1.8 V (MCU side) to 2.5 V and 3.3 V (peripheral side) via split B-port routing. Use Value: Single-package solution replaces two dedicated translators; IOFF prevents backfeed during MCU sleep modes with VCC(A) powered down. |
| Automotive ADAS Camera Link | Server Baseboard Management Controller (BMC) |
Use Scenario: Interfacing 1.2 V MIPI CSI-2 serializer output to 1.8 V image signal processor in rear-view camera module. IC Role / Device Role / Timing Role: Low-voltage bidirectional translator supporting 420 Mbps data rate with deterministic 5.4 ns An→Bn delay at 3.3 V→5.0 V. Use Value: Meets AEC-Q100 Grade 1 qualification; suspend mode isolates camera link during ignition-off to prevent battery drain. |
Use Scenario: Isolating 3.3 V BMC I²C bus from 5.0 V server management peripherals (fan controllers, voltage monitors) in data center hardware. IC Role / Device Role / Timing Role: 3-state transceiver providing OE-controlled bus segmentation and DIR-configurable read/write directionality. Use Value: Enables hot-plug-safe peripheral addition; IOFF blocks current flow when BMC is reset while peripherals remain powered. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply translating transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245RHLR | TI part with 1.2–3.6 V supply range only; no 5.0 V support on either rail; higher ICC (max 40 μA vs. 30 μA) | Not suitable for 5.0 V legacy peripheral interfacing; limited to low-voltage-only systems | Select when design uses only ≤3.6 V rails and requires TI's enhanced ESD (8 kV HBM) |
| TXB0308PWR | Auto-direction sensing (no DIR pin); supports 1.2–3.6 V only; higher propagation delay (10.2 ns typical An→Bn) | Eliminates DIR control logic but lacks deterministic direction control for synchronous protocols like SPI | Prefer for UART/I²C where direction is infrequent and latency tolerance >10 ns exists |
Compared with SN74AVC8T245RHLR and TXB0308PWR, the 74LVC8T245BQ,118 uniquely supports full 1.2–5.5 V dual-rail operation with DIR control, making it the only option for mixed 3.3 V/5.0 V industrial backplanes requiring sub-6 ns timing and AEC-Q100 compliance.
Availability
74LVC8T245BQ,118 is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive ADAS camera links, FPGA-to-peripheral bridging, and server BMC isolation requiring stable component supply across extended temperature and mixed-voltage operation.
Supply support for 74LVC8T245BQ,118 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
Nexperia is a global semiconductor expert delivering high-performance, reliable components for automotive, industrial, mobile, and computing markets, with leadership in logic, discrete, and MOSFET technologies.
The 74LVC/LVCH8T245 series targets mixed-voltage system interconnects requiring robust level translation, low-power operation, and fail-safe power sequencing - optimized for industrial automation, automotive ECUs, and infrastructure equipment.
FAQ
What is the maximum allowable voltage difference between VCC(A) and VCC(B)?
No maximum differential is specified - both supplies may operate anywhere from 1.2 V to 5.5 V independently. The device has been characterized for combinations including 1.2 V/5.0 V, 1.8 V/3.3 V, and 3.3 V/5.0 V, with timing and drive strength validated across all tested pairs per datasheet Tables 8–12.
Does the 74LVC8T245BQ,118 include bus-hold circuitry?
No - bus-hold is exclusive to the 74LVCH8T245 variant. The 74LVC8T245BQ,118 (without 'H') lacks internal bus-hold and requires external pull-up/pull-down resistors on unused A/B lines to prevent floating inputs. Pin function tables and static characteristics confirm IBHL/IBHH = 0 μA for this part number.
Can OE and DIR be tied together for simplified control?
No - OE and DIR serve fundamentally different functions: DIR controls data direction (A↔B), while OE disables all outputs into high-impedance. Tying them risks undefined behavior during transitions and violates recommended operating conditions. Datasheet Figure 1 and Table 3 require independent control for correct 3-state and directional operation.
Is the exposed thermal pad on the DHVQFN24 package required to be soldered?
The thermal pad (pin 1 index area) has no electrical function and may remain unsoldered. If soldered, it must be left electrically floating or connected to GND - not to VCC or signal nets. Thermal performance testing in the datasheet assumes standard reflow with optional pad attachment per IPC-J-STD-020 guidelines.
74LVC8T245BQ,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74LVC
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 32mA
- Voltage - Supply:
- 1.2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-DHVQFN (5.5x3.5)
74LVC8T245BQ,118 FAQ
1.How can I place an order for 74LVC8T245BQ,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVC8T245BQ,118 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 74LVC8T245BQ,118 reliable?
The price and inventory of 74LVC8T245BQ,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC8T245BQ,118 is usually 5 days.
3.What payment methods are accepted for 74LVC8T245BQ,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC8T245BQ,118 transactions.
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4.How is shipping managed for 74LVC8T245BQ,118?
74LVC8T245BQ,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVC8T245BQ,118 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 74LVC8T245BQ,118?
For technical support, including 74LVC8T245BQ,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC8T245BQ,118 requirements.
6.How does Aetrix verify that 74LVC8T245BQ,118 is sourced from the original manufacturer or authorized distributors?
All 74LVC8T245BQ,118 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 74LVC8T245BQ,118 meets industry standards.
7.What is the process for return or replacement of 74LVC8T245BQ,118?
All 74LVC8T245BQ,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC8T245BQ,118, 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 74LVC8T245BQ,118 part is unused and in its original packaging.
Return procedure for 74LVC8T245BQ,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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