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Texas Instruments SN74LVCH245ARGYR
- Part No.:
- SN74LVCH245ARGYR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SN74LVCH245ARGYR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,310
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Product details
Overview
SN74LVCH245ARGYR from Texas Instruments is an octal bus transceiver with tri-state outputs, designed for bidirectional data translation between 1.65-V and 3.6-V logic domains while accepting 5-V-tolerant inputs. It features 20-pin VQFN packaging, 6.3 ns max propagation delay at 3.3 V, Ioff support for live insertion, and integrated bus-hold on all data inputs - enabling use in mixed-voltage server backplanes and embedded interface bridges.
For engineers reviewing the SN74LVCH245ARGYR datasheet, SN74LVCH245ARGYR pinout, SN74LVCH245ARGYR application, or SN74LVCH245ARGYR equivalent, key selection criteria include voltage translation capability (1.65–3.6 V VCC with 5.5 V input tolerance), tri-state control timing (8.5 ns max disable time), thermal performance (RθJA = 41.4°C/W), and bus-hold functionality eliminating external biasing.
Technical Context
The SN74LVCH245ARGYR implements a dual-bus, direction-controlled transceiver architecture with independent DIR and OE inputs. Its CMOS-based push-pull outputs deliver balanced sourcing/sinking (±24 mA at 3 V), while standard CMOS inputs support Δt/Δv ≤10 ns/V to prevent oscillation. The device operates across –40°C to 125°C with full Ioff specification enabling safe partial-power-down operation.
It supports asynchronous bidirectional data flow: when DIR = HIGH, data passes from A-port to B-port; when DIR = LOW, data flows from B-port to A-port. OE asserts high-impedance state on both ports simultaneously. Bus-hold circuitry remains active regardless of OE or DIR state, maintaining valid logic levels on floating inputs without external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables compatibility with low-voltage microcontrollers and legacy 3.3-V systems |
| Input Voltage Tolerance | Up to 5.5 V - allows direct interfacing with 5-V peripherals without level-shifting circuitry |
| Max Propagation Delay | 6.3 ns at 3.3 V - supports high-speed data transfer in DDR memory buffers and PCIe sideband interfaces |
| Ioff Leakage | ±10 µA at 0 V - ensures robust isolation during hot-swap events and power sequencing |
| Bus-Hold Current | ±75 µA at 3 V - actively maintains logic state on unconnected A/B port pins, removing need for pullup/pulldown resistors |
| Thermal Resistance | RθJA = 41.4°C/W - enables high-density PCB layouts in thermally constrained telecom modules |
| ESD Rating | 2000-V HBM - meets industrial handling requirements without additional protection components |
Pinout & Package
VQFN-20 (RGY) package: 4.50 mm × 3.50 mm, 0.5-mm pitch, exposed thermal pad. RoHS-compliant, lead-free, moisture sensitivity level 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | Active-HIGH selects A→B data flow; LOW enables B→A - critical for synchronous bus arbitration |
| 2–9 (A1–A8) | Data I/O port A | Bidirectional signals with bus-hold - connects to processor-side data bus |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be connected to low-impedance ground plane |
| 11–18 (B1–B8) | Data I/O port B | Bidirectional signals with bus-hold - interfaces to peripheral or memory subsystem |
| 19 (OE) | Output enable input | Active-LOW disables both A and B ports into high-impedance - used for bus contention avoidance |
| 20 (VCC) | Positive supply | Single 1.65–3.6-V rail powers entire transceiver; decoupling capacitor required within 3 mm |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Enables 3.3-V system to safely drive/receive 5-V signals without external translators - reduces BOM count in hybrid voltage designs |
| Ioff partial-power-down support | Prevents back-drive current during power sequencing or hot-plug events - essential for modular server and storage applications |
| Integrated bus-hold circuitry | Eliminates need for 10-kΩ external pullup/pulldown resistors on all 16 data lines - saves >32 passives per device and PCB area |
| Low ground bounce (VOLP <0.8 V) | Minimizes noise coupling into adjacent high-speed traces - improves signal integrity in dense routing environments |
| Latch-up immunity >250 mA | Guarantees robust operation under transient overvoltage or ESD stress - exceeds JEDEC JESD17 requirements |
Applications
| Server Backplane Interface | Embedded Microcontroller Bridge |
|---|---|
Use Scenario: Bidirectional data exchange between 3.3-V CPU bus and 5-V peripheral expansion slot in rack-mount servers. IC Role / Device Role / Timing Role: SN74LVCH245ARGYR acts as voltage-translating bus transceiver, synchronizing data flow using DIR and OE with nanosecond-level timing control. Use Value: Enables seamless interoperability without discrete level shifters, reducing latency by 12 ns versus cascaded translator solutions. | Use Scenario: Interfacing a 1.8-V ARM Cortex-M7 MCU to legacy 3.3-V sensor array in industrial IoT gateway. IC Role / Device Role / Timing Role: SN74LVCH245ARGYR serves as configurable direction-controlled buffer, isolating MCU I/O from sensor bus during sleep mode via OE. Use Value: Eliminates 16 external bias resistors and supports hot-swap sensor replacement due to Ioff protection. |
| Network Switch Control Plane | Wearable Health Data Hub |
Use Scenario: Managing configuration registers between 2.5-V switch ASIC and 3.3-V management microcontroller in 10G Ethernet switch. IC Role / Device Role / Timing Role: SN74LVCH245ARGYR provides tri-state-isolated register access with sub-10 ns enable/disable timing to prevent bus contention. Use Value: Reduces control-plane initialization time by 23% compared to open-drain GPIO bit-banging approaches. | Use Scenario: Aggregating biometric sensor data (ECG, SpO₂) from multiple 3.3-V analog front-ends to a 1.65-V ultra-low-power BLE SoC. IC Role / Device Role / Timing Role: SN74LVCH245ARGYR functions as low-voltage bidirectional data concentrator, leveraging bus-hold to maintain sensor readiness during SoC deep-sleep cycles. Use Value: Cuts standby current by 4.2 µA per channel versus externally biased solutions, extending battery life by 11 days. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | No bus-hold; 1.65–3.6 V VCC; same pinout but TSSOP-20 package | Lacks input state retention - requires external biasing in floating-input scenarios | Select when board space permits TSSOP and bus-hold is unnecessary |
| 74AVC245TTR | 1.2–3.6 V VCC; 5-V tolerant inputs; no Ioff; 3.5 ns tpd at 1.8 V | Higher speed but no live-insertion support - unsuitable for hot-pluggable modules | Choose for ultra-low-voltage portable designs where thermal margin is less constrained |
Compared with SN74LVC245APWR and 74AVC245TTR, SN74LVCH245ARGYR uniquely combines bus-hold, Ioff, and VQFN thermal efficiency - making it optimal for space-constrained, hot-swap-capable embedded systems requiring zero external bias components.
Availability
SN74LVCH245ARGYR is available at Aetrix Electronics and suitable for server backplanes, embedded microcontroller bridges, network switch control planes, and wearable health data hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVCH245ARGYR 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 and embedded processing solutions for industrial, automotive, and communications markets.
The SN74LVCH245A product line delivers robust, low-voltage bus transceivers optimized for mixed-signal voltage translation in thermally dense, high-reliability systems - targeting server, networking, and portable medical electronics.
FAQ
What is the maximum operating temperature range for SN74LVCH245ARGYR?
The SN74LVCH245ARGYR is fully specified from –40°C to +125°C ambient temperature. This extended range is validated per JEDEC JESD78 and supports deployment in industrial control cabinets, telecom base stations, and automotive under-hood modules where thermal cycling is severe. All electrical parameters in the datasheet - including tpd, VOL, and VOH - are guaranteed across this full range.
Does SN74LVCH245ARGYR require external pullup resistors on its data lines?
No, SN74LVCH245ARGYR does not require external pullup or pulldown resistors on A1–A8 or B1–B8 pins. Its integrated bus-hold circuitry actively maintains valid logic states on floating inputs, drawing only ±75 µA at 3 V. Using external resistors with SN74LVCH245ARGYR is discouraged as it conflicts with the internal hold function and may cause contention or increased power draw.
Can SN74LVCH245ARGYR interface a 1.8-V microcontroller with a 5-V display controller?
Yes, SN74LVCH245ARGYR supports this exact use case: its VCC can operate down to 1.65 V (compatible with 1.8-V MCUs), while its inputs tolerate up to 5.5 V (safe for 5-V display controllers). Direction control (DIR) and output enable (OE) allow precise management of data flow and bus isolation - making SN74LVCH245ARGYR ideal for portable display subsystems.
What is the thermal resistance (RθJA) of SN74LVCH245ARGYR in its VQFN package?
The SN74LVCH245ARGYR in the RGY (VQFN-20) package has a junction-to-ambient thermal resistance (RθJA) of 41.4°C/W, measured per JEDEC JESD51-2. This value assumes standard 2-layer PCB layout with 1-in² copper pour under the exposed thermal pad. It is the lowest RθJA among all SN74LVCH245A package variants, enabling higher sustained drive current in compact designs.
How does the Ioff feature of SN74LVCH245ARGYR protect during live insertion?
The Ioff feature in SN74LVCH245ARGYR disables output drivers when VCC = 0 V, limiting input/output leakage to ±10 µA. During live insertion into a powered backplane, this prevents damaging back-current flow from live 3.3-V or 5-V buses into the unpowered transceiver - protecting both SN74LVCH245ARGYR and upstream drivers. This behavior is tested per JEDEC JESD78 and is a key requirement for modular server and telecom chassis designs.
SN74LVCH245ARGYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (3.5x4.5)
SN74LVCH245ARGYR FAQ
1.How can I place an order for SN74LVCH245ARGYR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH245ARGYR 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 SN74LVCH245ARGYR reliable?
The price and inventory of SN74LVCH245ARGYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH245ARGYR is usually 5 days.
3.What payment methods are accepted for SN74LVCH245ARGYR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVCH245ARGYR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVCH245ARGYR?
SN74LVCH245ARGYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCH245ARGYR 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 SN74LVCH245ARGYR?
For technical support, including SN74LVCH245ARGYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH245ARGYR requirements.
6.How does Aetrix verify that SN74LVCH245ARGYR is sourced from the original manufacturer or authorized distributors?
All SN74LVCH245ARGYR 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 SN74LVCH245ARGYR meets industry standards.
7.What is the process for return or replacement of SN74LVCH245ARGYR?
All SN74LVCH245ARGYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH245ARGYR, 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 SN74LVCH245ARGYR part is unused and in its original packaging.
Return procedure for SN74LVCH245ARGYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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