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Toshiba Semiconductor and Storage 74VHCT573AFT
- Part No.:
- 74VHCT573AFT
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- Latches
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VHCT573AFT.pdf
- Description:
- IC LATCH OCTAL D-TYPE 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,953
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Product details
Overview
74VHCT573AFT from Toshiba Electronic Devices & Storage Corporation is an octal D-type transparent latch with 3-state outputs, designed for bus interface and data latching in 5 V digital systems. It features TTL-compatible inputs (VIH = 2.0 V min, VIL = 0.8 V max), 7.7 ns typical propagation delay at VCC = 5.0 V, and operates across -40°C to +125°C - enabling use in automotive body control modules and industrial PLC I/O expansion.
For engineers reviewing the 74VHCT573AFT datasheet, 74VHCT573AFT pinout, 74VHCT573AFT application, or 74VHCT573AFT equivalent, key selection criteria include its AEC-Q100 qualification, 3-state output leakage ≤0.1 µA, quiescent ICC ≤4.0 µA, and TSSOP20B package compatibility with space-constrained PCB layouts.
Technical Context
This device implements a silicon gate C²MOS-based octal latch architecture with independent LE (latch enable) and OE (output enable) controls. Its dual-control logic allows transparent data flow when LE is high and latched storage when LE transitions low - while OE independently places all eight outputs into high-impedance state regardless of latch state.
The 74VHCT573AFT supports mixed-voltage interfacing between 3.3 V and 5 V domains via TTL-level input thresholds and rail-to-rail input/output tolerance (0–5.5 V independent of VCC). Built-in power-down protection on all pins prevents damage during hot insertion or supply sequencing mismatches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal D-type transparent latch with 3-state outputs - enables bidirectional bus buffering and data hold in microcontroller peripheral interfaces. |
| Supply Voltage | 4.5–5.5 V - ensures stable operation under automotive battery ripple and industrial 5 V rail variations. |
| Propagation Delay | 7.7 ns (typ.) at VCC = 5.0 V - supports >100 MHz bus timing margins in high-speed control applications. |
| Input Compatibility | TTL-level inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V) - eliminates need for level-shifting circuitry when driving from legacy 5 V logic. |
| Operating Temperature | -40°C to +125°C - qualified per AEC-Q100 Rev. H for under-hood automotive electronics and industrial motor drives. |
| Quiescent Current | ≤4.0 µA at TA = 25°C - minimizes standby power in always-on vehicle modules and energy-sensitive embedded systems. |
| 3-State Leakage | ≤0.1 µA at VOUT = 5.5 V - prevents signal contention and crosstalk in shared-bus architectures with multiple drivers. |
Pinout & Package
TSSOP20B - 20-pin thin shrink small-outline package (4.4 mm × 6.5 mm, 0.65 mm pitch), optimized for automated assembly and thermal performance in dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low control: pulls all Q outputs to high-impedance when high; enables normal output drive when low. |
| 11 (LE) | Latch Enable | Active-high control: enables transparent pass-through of D inputs to Q outputs when high; latches current D values when falling edge occurs. |
| 2–9 (D1–D8) | Data Inputs | Asynchronous parallel inputs accepting TTL-compatible logic levels; tolerate 0–5.5 V regardless of VCC. |
| 12–19 (Q1–Q8) | Tri-State Outputs | Driven outputs reflecting latched D values when OE = low; enter high-Z state when OE = high - enabling bus sharing. |
| 10 (GND) | Ground | Reference return path for all internal logic and I/O circuits; requires low-inductance connection to minimize ground bounce. |
| 20 (VCC) | Supply | Primary 5 V power rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Complies with Rev. H stress testing for automotive applications - validated for temperature cycling, HTOL, and ESD robustness. |
| Rail-to-rail I/O tolerance | Inputs/outputs withstand 0–5.5 V independent of VCC - enables safe hot-plug operation and battery-backup scenarios without clamping diodes. |
| Balanced propagation delays | tPLH ≈ tPHL - reduces skew-induced timing violations in synchronous bus transfers across all eight channels. |
| Low dynamic noise | VOLP ≤ 1.5 V - limits ground bounce and crosstalk in multi-latch systems operating at high switching frequencies. |
| PIN- and FUNCTION-compatible | Drop-in replacement for 74ACT/HCT/AHCT573 series - preserves existing PCB layout and firmware logic without redesign. |
Applications
| Automotive Body Control Unit | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Latching sensor status and actuator commands in centralized vehicle body controllers handling door locks, lighting, and HVAC. IC Role / Device Role / Timing Role: Octal latch buffers MCU GPIOs to drive high-current loads while isolating sensitive logic from noisy power domains. Use Value: AEC-Q100 qualification and -40°C to +125°C operation ensure reliability in under-dash environments with wide thermal swings. |
Use Scenario: Expanding discrete I/O capacity in modular programmable logic controllers used in factory automation systems. IC Role / Device Role / Timing Role: Provides isolated, 3-state-controlled data paths between CPU bus and field I/O modules - enabling hot-swap capability. Use Value: 0.1 µA 3-state leakage prevents bus contention during module insertion/removal, supporting maintenance without system shutdown. |
| Embedded System Bus Interface | Legacy System Level-Shifting Bridge |
Use Scenario: Interfacing 32-bit microcontrollers with external SRAM or flash memory requiring address/data multiplexing control. IC Role / Device Role / Timing Role: Transparent latch captures address bus values during memory access cycles, freeing MCU pins for other functions. Use Value: 7.7 ns propagation delay meets setup/hold timing for 25 MHz memory buses - eliminating wait states in real-time firmware. |
Use Scenario: Bridging 3.3 V FPGA I/O banks to legacy 5 V peripheral subsystems (e.g., displays, encoders, analog front-ends). IC Role / Device Role / Timing Role: Level translator with direction control via OE/LE - maintains signal integrity without external resistors or active translators. Use Value: TTL-compatible inputs accept 3.3 V logic highs directly; rail-to-rail I/O tolerance avoids damage during voltage sequencing mismatches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT573PW | Same logic function and pinout; wider VCC range (4.5–5.5 V), but only rated to +85°C (not AEC-Q100). | Not suitable for automotive under-hood use; acceptable for commercial-grade industrial control panels. | Select SN74HCT573PW only if ambient temperature stays below 85°C and automotive qualification is unnecessary. |
| 74LCX573MTCX | Lower VCC range (2.0–3.6 V); 3.3 V native logic, not TTL-compatible - requires level shifters for 5 V systems. | Designed for low-voltage portable/embedded systems; incompatible with direct 5 V bus interfacing. | Choose 74LCX573MTCX only in pure 3.3 V domains where power efficiency outweighs interface simplicity. |
Compared with SN74HCT573PW and 74LCX573MTCX, the 74VHCT573AFT uniquely combines AEC-Q100 compliance, full 5 V bus compatibility, and extended temperature support - making it the sole option for automotive-grade 5 V latching where reliability and drop-in replaceability are mandatory.
Availability
74VHCT573AFT is available at Aetrix Electronics and suitable for automotive body control units, industrial PLC I/O expansion, embedded system bus interfaces, and legacy system level-shifting bridges requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74VHCT573AFT 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
Toshiba Electronic Devices & Storage Corporation designs high-reliability semiconductor solutions for automotive, industrial, and consumer applications, with emphasis on AEC-Q100-compliant logic and power devices.
The 74VHCT573AFT belongs to Toshiba's VHCT-series advanced CMOS logic family, engineered specifically for high-speed, low-power 5 V digital interfacing in harsh-environment applications demanding extended temperature operation and automotive qualification.
FAQ
What is the maximum operating temperature for the 74VHCT573AFT?
The 74VHCT573AFT is rated for continuous operation from -40°C to +125°C, fully compliant with AEC-Q100 Rev. H requirements for automotive under-hood applications. This rating is verified across all electrical parameters including propagation delay, leakage current, and output drive strength - ensuring functional integrity in engine control modules and transmission ECUs.
Does the 74VHCT573AFT support 3.3 V to 5 V level shifting?
Yes, the 74VHCT573AFT supports bidirectional level shifting between 3.3 V and 5 V systems. Its TTL-compatible inputs accept 3.3 V logic highs (VIH ≥ 2.0 V) directly, while rail-to-rail I/O tolerance (0–5.5 V) allows safe connection to 5 V buses without external components - making it ideal for FPGA-to-peripheral bridging.
Is the 74VHCT573AFT pin-compatible with standard 74HCT573 devices?
Yes, the 74VHCT573AFT is pin- and function-compatible with industry-standard 74HCT573, 74ACT573, and 74AHCT573 devices in TSSOP20B packaging. This enables drop-in replacement without PCB layout changes, preserving existing firmware timing and signal routing in legacy designs.
What is the typical propagation delay of the 74VHCT573AFT at 5 V supply?
The 74VHCT573AFT delivers 7.7 ns typical propagation delay (LE→Q and D→Q) at VCC = 5.0 V and TA = 25°C, with worst-case 15.5 ns at -40°C to +125°C. This performance enables reliable operation in 25 MHz+ digital buses while maintaining timing margins for setup/hold compliance in microcontroller peripheral interfaces.
How does the 74VHCT573AFT handle power sequencing mismatches?
The 74VHCT573AFT incorporates built-in power-down protection on all inputs and outputs, allowing 0–5.5 V to be applied regardless of VCC state. This prevents latch-up or damage during hot-board insertion, battery backup transitions, or uncontrolled power-up sequences - critical for automotive infotainment and telematics modules.
74VHCT573AFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- 74VHCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- D-Type Latch
- Circuit:
- 8:8
- Output Type:
- Tri-State
- Voltage - Supply:
- 4.5V ~ 5.5V
- Independent Circuits:
- 1
- Delay Time - Propagation:
- 8.5ns
- Current - Output High, Low:
- 8mA, 8mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74VHCT573AFT FAQ
1.How can I place an order for 74VHCT573AFT through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT573AFT 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 74VHCT573AFT reliable?
The price and inventory of 74VHCT573AFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT573AFT is usually 5 days.
3.What payment methods are accepted for 74VHCT573AFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT573AFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT573AFT?
74VHCT573AFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT573AFT 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 74VHCT573AFT?
For technical support, including 74VHCT573AFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT573AFT requirements.
6.How does Aetrix verify that 74VHCT573AFT is sourced from the original manufacturer or authorized distributors?
All 74VHCT573AFT 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 74VHCT573AFT meets industry standards.
7.What is the process for return or replacement of 74VHCT573AFT?
All 74VHCT573AFT units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT573AFT, 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 74VHCT573AFT part is unused and in its original packaging.
Return procedure for 74VHCT573AFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74VHCT573AFT Tags
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