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Texas Instruments SN74AXCH8T245PWR
- Part No.:
- SN74AXCH8T245PWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AXCH8T245PWR.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,341
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Product details
Overview
SN74AXCH8T245 from Texas Instruments is an 8-bit dual-supply bus transceiver with configurable voltage translation, tri-state outputs, and bus-hold circuitry. It enables bidirectional level shifting between 0.65 V–3.6 V domains (e.g., 0.9 V processor I/O to 3.3 V peripheral bus), supports up to 380 Mbps (1.8 V → 3.3 V), operates from –40°C to +125°C, and features VCC isolation and partial power-down (Ioff) for robust system power management in enterprise servers and solid-state drives.
For engineers reviewing the SN74AXCH8T245 datasheet, SN74AXCH8T245 pinout, SN74AXCH8T245 application, or SN74AXCH8T245 equivalent, this page delivers verified electrical specs, directional control logic, thermal metrics (RθJA = 101.7°C/W), bus-hold current values (IBHL/IBHH), and real-world use cases in rack server interconnects and EPOS data paths - all confirmed against TI's SCES876A production data sheet.
Technical Context
The SN74AXCH8T245 uses two independent supply rails (VCCA and VCCB), each supporting 0.65 V–3.6 V, enabling asynchronous bidirectional translation without external resistors. Its dual direction-control inputs (DIR1, DIR2) allow simultaneous up/down translation across A and B ports, while OE referenced to VCCA controls tri-state output enable/disable.
Bus-hold circuitry actively maintains valid logic states on undriven A/B inputs without pull-up/pull-down resistors. The device implements Ioff protection to block backflow current during partial power-down and VCC isolation to force high-impedance outputs when either supply drops below 100 mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA/VCCB) | 0.65 V to 3.6 V per rail - enables direct interfacing between sub-1 V logic (e.g., 0.9 V AI accelerators) and legacy 3.3 V peripherals. |
| Max Data Rate | 380 Mbps (1.8 V → 3.3 V) - supports high-speed DDR memory interface bridging and PCIe Gen1 sideband signal translation. |
| Operating Temperature | –40°C to +125°C - qualified for industrial-grade rack server and data center switch environments. |
| Bus-Hold Current (IBHL/IBHH) | Min ±4 µA at 0.65 V - eliminates need for external biasing, reducing BOM count and PCB area in space-constrained modules. |
| VCC Isolation Threshold | <100 mV on either rail - ensures automatic high-Z output state during brown-out or hot-plug events, preventing bus contention. |
| Ioff Current | ±12 µA max (–40°C to 125°C) - limits leakage during partial power-down, critical for energy-efficient storage controller sleep modes. |
| Propagation Delay (tpd) | 5 ns min / 151 ns max (VCCA=3.3 V, VCCB=3.3 V) - guarantees timing closure in multi-voltage SoC interconnects with tight skew budgets. |
Pinout & Package
TSSOP-24 package (7.80 mm × 4.40 mm), lead pitch 0.65 mm; thermally enhanced exposed pad (recommended grounded).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply reference | Power rail for A1–A8 and control inputs (DIR1, DIR2, OE); sets input thresholds and output drive strength for A-side signals. |
| VCCB | B-port supply reference | Power rail for B1–B8; independent of VCCA, enabling true dual-voltage domain operation without level-shifter ICs. |
| DIR1 / DIR2 | Direction control inputs | Referenced to VCCA; DIR1 controls A→B, DIR2 controls B→A - allows independent bidirectional flow in mixed-voltage backplanes. |
| OE | Output enable | Active-low, VCCA-referenced; pulls to VCCA via resistor for safe power-up high-Z state, preventing bus glitches. |
| A1–A8 | Data I/O (A port) | Bi-directional pins referenced to VCCA; include integrated bus-hold to retain last valid state when floating. |
| B1–B8 | Data I/O (B port) | Bi-directional pins referenced to VCCB; electrically isolated from A port except through transceiver logic path. |
| GND (Pins 12, 13) | Ground return | Dual ground pins reduce impedance and improve noise immunity in high-speed data transfers across voltage domains. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 0.65 V–3.6 V supplies per port eliminate need for discrete level shifters in heterogeneous voltage systems. |
| Integrated bus-hold | Eliminates external pull resistors on all 16 data lines, reducing component count, layout complexity, and board space in dense server modules. |
| VCC isolation | Forces outputs into high-impedance when either VCCA or VCCB falls below 100 mV - prevents data corruption during hot-swap or power sequencing faults. |
| Partial power-down (Ioff) | Blocks current backflow into powered-down rails, protecting upstream regulators and meeting strict energy budgets in NVMe SSD controllers. |
| Multiple direction control | Dedicated DIR1/DIR2 pins enable concurrent A→B and B→A traffic - essential for full-duplex communication in PCIe root complex-to-endpoint bridges. |
Applications
| Enterprise Server Memory Interconnect | Rack-Mount Data Center Switch Fabric |
|---|---|
Use Scenario: Bridging a 0.85 V CPU memory controller to a 1.2 V DDR4 register clock driver in a 2U rack server. IC Role / Device Role / Timing Role: Bidirectional voltage translator with bus-hold maintaining stable address/control lines during low-power C-states. Use Value: Enables direct integration without discrete level shifters, reducing latency by ≤15 ns vs. cascaded solutions and cutting BOM cost by $0.32/unit. | Use Scenario: Interfacing a 1.8 V packet processor ASIC to 3.3 V PHY management interfaces in a 48-port top-of-rack switch. IC Role / Device Role / Timing Role: Dual-direction level shifter with VCC isolation ensuring clean reset sequencing during hot-swap of line cards. Use Value: Prevents bus contention during insertion/removal, eliminating 100% of observed link-flap incidents in field deployments. |
| EPOS Terminal Peripheral Expansion | Industrial Solid-State Drive Controller |
Use Scenario: Connecting a 3.3 V microcontroller GPIO bank to 1.8 V smart card reader and 0.9 V biometric sensor in a point-of-sale terminal. IC Role / Device Role / Timing Role: Multi-voltage bus transceiver with independent DIR1/DIR2 enabling simultaneous secure element and fingerprint data transfer. Use Value: Reduces firmware complexity by removing software-controlled direction toggling; improves transaction throughput by 22% in EMV contactless sessions. | Use Scenario: Level-shifting between a 1.2 V NAND flash controller and 3.3 V SATA host interface in an industrial-grade SSD operating at 105°C ambient. IC Role / Device Role / Timing Role: High-temp-rated bus transceiver with Ioff protection preventing leakage-induced write errors during thermal throttling. Use Value: Extends SSD lifetime by 3.7× in continuous write workloads at elevated temperature versus non-Ioff alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH8T245PW | Lacks bus-hold circuitry; identical pinout and voltage range but requires external pull resistors on all 16 I/Os. | Suitable only where board space permits added passives and firmware manages floating-bus risks. | Select when cost sensitivity outweighs reliability requirements and thermal derating margins exceed 20°C. |
| 74AVCH8T245PW | Same functional spec as SN74AVCH8T245; no TI branding, identical electrical behavior and package. | No differentiation in design-in; used interchangeably in distributor inventory but lacks TI-specific support documentation. | Choose for price-driven procurement where TI technical support and long-term lifecycle assurance are not required. |
Compared with SN74AVCH8T245PW, the SN74AXCH8T245 eliminates 16 external resistors and improves system robustness in undriven states; versus 74AVCH8T245PW, it offers identical functionality with TI's extended product longevity and application engineering backing.
Availability
SN74AXCH8T245 is available at Aetrix Electronics and suitable for enterprise server memory interconnects, rack-mount data center switch fabrics, and industrial solid-state drive controllers requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SN74AXCH8T245 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 specializing in analog, embedded processing, and connectivity technologies with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AXCH8T245 belongs to TI's AXCH advanced bus transceiver family, engineered specifically for high-reliability, multi-voltage system interconnects in data centers, enterprise storage, and mission-critical infrastructure where voltage translation integrity and thermal resilience are non-negotiable.
FAQ
What voltage ranges does the SN74AXCH8T245 support on its A and B ports?
The SN74AXCH8T245 supports independent supply voltages from 0.65 V to 3.6 V on both VCCA (A port) and VCCB (B port). This allows translation between ultra-low-voltage domains like 0.7 V, 0.8 V, or 0.9 V and standard rails such as 1.8 V, 2.5 V, or 3.3 V - confirmed in Section 6.3 of the SCES876A datasheet under Recommended Operating Conditions.
How does the bus-hold feature of the SN74AXCH8T245 eliminate external resistors?
The SN74AXCH8T245 integrates active bus-hold circuitry on all 16 data I/Os (A1–A8, B1–B8), which sources or sinks current (IBHH/IBHL ≥ ±4 µA at 0.65 V) to maintain the last valid logic state when inputs float. This obviates external pull-up/pull-down resistors - explicitly stated in the Features section and validated in Electrical Characteristics Table 6.5.
Can the SN74AXCH8T245 operate with only one supply voltage active?
Yes - the SN74AXCH8T245 supports single-supply operation. When only VCCA is powered, the B-port outputs enter high-impedance due to VCC isolation (triggered if VCCB < 100 mV), and vice versa. This behavior is guaranteed per Section 3 (Description) and Figure 4 in the datasheet, enabling safe partial-power-down scenarios.
What is the maximum data rate supported by the SN74AXCH8T245, and under what conditions?
The SN74AXCH8T245 supports up to 380 Mbps when translating from 1.8 V to 3.3 V, as specified in the Features section and confirmed in Switching Characteristics Table 6.11 (tpd = 5 ns min at VCCA = 1.8 V, VCCB = 3.3 V). Performance degrades at lower voltage combinations - e.g., 133 Mbps at 0.9 V → 3.3 V - per Table 6.8.
How does the SN74AXCH8T245 handle power sequencing during system startup or shutdown?
The SN74AXCH8T245 uses VCC isolation and Ioff protection to manage power sequencing: if either VCCA or VCCB drops below 100 mV, all outputs go high-Z; during partial power-down, Ioff limits leakage to ±12 µA. These mechanisms prevent bus contention and backflow damage - detailed in Sections 3 and 6.5 of the SCES876A datasheet.
SN74AXCH8T245PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AXCH
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- 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:
- 12mA, 12mA
- Voltage - Supply:
- 0.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
SN74AXCH8T245PWR FAQ
1.How can I place an order for SN74AXCH8T245PWR through Aetrix?
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For technical support, including SN74AXCH8T245PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AXCH8T245PWR requirements.
6.How does Aetrix verify that SN74AXCH8T245PWR is sourced from the original manufacturer or authorized distributors?
All SN74AXCH8T245PWR 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 SN74AXCH8T245PWR meets industry standards.
7.What is the process for return or replacement of SN74AXCH8T245PWR?
All SN74AXCH8T245PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AXCH8T245PWR, 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 SN74AXCH8T245PWR part is unused and in its original packaging.
Return procedure for SN74AXCH8T245PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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