My Inquiry
My Account
NXP Semiconductors 74ABT646APW,118
- Part No.:
- 74ABT646APW,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ABT646APW,118.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,293
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74ABT646APW,118 from NXP Semiconductors is an octal bus transceiver/register with 3-state outputs, combining BiCMOS logic for high-speed bidirectional data transfer and register storage. It supports real-time or registered A↔B bus communication at up to 350 MHz, delivers ±64 mA output drive, and operates across −40 °C to +85 °C in a TSSOP24 package. It enables dynamic bus management in industrial control backplanes and memory interface subsystems.
For engineers reviewing the 74ABT646APW,118 datasheet, 74ABT646APW,118 pinout, 74ABT646APW,118 application, or 74ABT646APW,118 equivalent, key selection criteria include its dual-clock (CPAB/CPBA) register control, independent A/B bus storage capability, direction-selectable 3-state transceiver mode, and robust ESD protection exceeding 2000 V HBM.
Technical Context
The 74ABT646APW,118 implements a multiplexed bus architecture with two independent D-type flip-flop registers-one per bus-enabling simultaneous capture of A-bus or B-bus data on rising clock edges. Its DIR and OE pins decouple direction control from output enable, allowing isolated register loading while outputs remain tri-stated.
Real-time transfer and stored-data transfer are selected via SAB/SBA inputs, supporting four distinct bus operations: live A→B, live B→A, A→B register load, and B→A register load. The device features power-up 3-state and latch-up protection >500 mA per JESD78B Class II Level A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS systems and stable operation under rail variation. |
| Max clock frequency | 350 MHz - enables high-throughput data routing in fast synchronous bus interfaces. |
| Output drive | +64 mA / −32 mA - supports heavy capacitive loads and fan-out to multiple TTL inputs without external buffers. |
| Propagation delay | 1.5 ns to 5.9 ns - guarantees sub-6 ns timing margins for critical setup/hold paths in high-speed designs. |
| ESD rating | HBM >2000 V - provides robust handling during PCB assembly and field service without additional protection circuitry. |
| Operating temperature | −40 °C to +85 °C - validated for industrial-grade embedded systems including motor drives and programmable logic controllers. |
| Input clamp voltage | −1.2 V - allows safe interfacing with negative-going signals or undershoot events without damage. |
Pinout & Package
TSSOP24 package (SOT355-1), 24-pin plastic thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CPAB | A-to-B clock input | Rising-edge-triggered clock for latching A-bus data into B-side registers. |
| 2 SAB | A-to-B select input | Enables stored A-bus data transfer to B-bus when OE = LOW and DIR = HIGH. |
| 3 DIR | Direction control input | Defines active data path: HIGH = A→B, LOW = B→A; independent of OE state. |
| 4–11 A0–A7 | A-side I/O terminals | Bidirectional data lines with 3-state control; function as inputs during register load, outputs during transceive. |
| 12 GND | Ground reference | Primary 0 V return for logic and output drivers; must be low-impedance for noise immunity. |
| 13–20 B0–B7 | B-side I/O terminals | Bidirectional data lines mirroring A-side behavior; support independent register capture and output drive. |
| 21 OE | Output enable (active LOW) | Tri-states all A/B outputs when HIGH; does not disable input functionality for register loading. |
| 22 SBA | B-to-A select input | Enables stored B-bus data transfer to A-bus when OE = LOW and DIR = LOW. |
| 23 CPBA | B-to-A clock input | Rising-edge-triggered clock for latching B-bus data into A-side registers. |
| 24 VCC | Positive supply | 5 V nominal power rail; requires local 100 nF ceramic decoupling adjacent to pin 24. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated ABT245 + ABT373A functionality | Combines transceiver and latch functions in one die-reduces board space and interconnect complexity versus discrete solutions. |
| Multiplexed real-time and stored data paths | Four operational modes (real-time A→B/B→A, stored A→B/B→A) controlled by DIR, OE, SAB, and SBA-enables flexible bus arbitration without external logic. |
| Live insertion/extraction support | Power-up 3-state and bus-hold immunity allow hot-swap capability in modular backplane systems without system reset. |
| High-current 3-state outputs | ±64 mA drive strength maintains signal integrity across long traces or high-fanout loads, eliminating need for external line drivers. |
| Latch-up protection | Exceeds 500 mA per JESD78B Class II Level A-ensures survivability in noisy industrial environments with transient ground shifts. |
Applications
| Industrial Backplane Interface | Memory Expansion Subsystem |
|---|---|
|
Use Scenario: Bidirectional data routing between CPU module and peripheral expansion slots in programmable logic controller (PLC) chassis. IC Role / Device Role / Timing Role: Acts as configurable bus bridge with register hold capability to decouple timing domains between master and slave modules. Use Value: Enables deterministic latency via stored-data transfer mode, avoiding metastability during asynchronous slot insertion/removal. |
Use Scenario: Interfacing microcontroller address/data bus to external SRAM or Flash memory banks with separate read/write strobes. IC Role / Device Role / Timing Role: Provides direction-controlled 3-state isolation and register buffering to synchronize memory access cycles with variable wait states. Use Value: Eliminates need for separate transceivers and latches, reducing component count and PCB layer count in space-constrained embedded designs. |
| Test Equipment Bus Controller | Digital Signal Processing Interface |
|
Use Scenario: Managing shared test bus between multiple instrument modules (e.g., DMM, waveform generator) in automated test equipment (ATE). IC Role / Device Role / Timing Role: Functions as intelligent bus arbitrator with real-time and stored transfer modes to prevent data collisions during concurrent module access. Use Value: Supports live insertion of test modules while maintaining bus integrity-no system reboot required after hardware reconfiguration. |
Use Scenario: Connecting DSP data bus to external FIFO or co-processor in radar signal processing chain requiring burst-mode data handshaking. IC Role / Device Role / Timing Role: Serves as high-speed data pipeline with register staging to absorb jitter between DSP core clock and external memory clock domains. Use Value: Achieves 350 MHz throughput with sub-6 ns propagation delays-meets real-time latency requirements for multi-channel beamforming algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver/register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ABT646AD,118 | SO24 package (7.5 mm width); higher thermal resistance; identical electrical specs and pinout. | Suitable for through-hole prototyping or legacy PCBs with SOIC footprints; less suitable for high-density layouts. | Select when board layout uses SO24 land pattern or requires greater mechanical rigidity than TSSOP. |
| 74ABT646ADB,118 | SSOP24 package (5.3 mm width); intermediate thermal performance; identical logic and timing behavior. | Offers better density than SO24 but less compact than TSSOP; used where SSOP is standardized across product family. | Choose for migration paths from SSOP-based designs or where thermal dissipation exceeds TSSOP limits but SO24 is too large. |
Compared with 74ABT646AD,118 and 74ABT646ADB,118, the 74ABT646APW,118 provides the smallest footprint (4.4 mm width) and lowest profile for space-constrained industrial PCBs, while maintaining full functional and timing equivalence across all three variants.
Availability
74ABT646APW,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, and digital signal processing interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 74ABT646APW,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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The 74ABT646APW,118 belongs to NXP's ABT-series advanced BiCMOS logic family, designed specifically for high-speed, low-power bus interface applications in industrial control, test equipment, and embedded computing systems.
FAQ
What is the maximum operating frequency of the 74ABT646APW,118?
The 74ABT646APW,118 supports a maximum clock frequency of 350 MHz under recommended operating conditions (VCC = 5.0 V ± 0.5 V, −40 °C to +85 °C). This value is specified in Table 7 of the NXP datasheet and applies to both CPAB and CPBA inputs. Real-world timing margins depend on PCB layout, load capacitance, and supply stability-designers should verify with worst-case propagation delays (tPLH/tPHL ≤ 5.9 ns) in their specific implementation.
Does the 74ABT646APW,118 support hot-swap or live insertion?
Yes, the 74ABT646APW,118 supports live insertion and extraction due to its power-up 3-state feature and robust input clamping (VIK = −1.2 V). During power ramp-up, outputs remain in high-impedance state until VCC stabilizes, preventing bus contention. Combined with >2000 V HBM ESD protection, this makes the 74ABT646APW,118 suitable for modular backplane systems where cards are inserted or removed without powering down the main chassis.
How does the DIR pin interact with OE and SAB/SBA in the 74ABT646APW,118?
In the 74ABT646APW,118, DIR controls data direction only when OE is active (LOW); when OE = HIGH, all outputs are tri-stated regardless of DIR state. SAB and SBA determine whether real-time or stored data flows: with DIR = HIGH and SAB = HIGH, real-time A→B transfer occurs; with SAB = LOW, previously clocked A-bus data is transferred to B-bus. These controls operate independently-DIR does not affect register loading, which is governed solely by CPAB/CPBA edges.
What are the absolute maximum ratings for VCC and VI in the 74ABT646APW,118?
The 74ABT646APW,118 has an absolute maximum VCC of +7.0 V and VI of +7.0 V (with current limiting observed), per Table 4 in the NXP datasheet. However, recommended operating VCC is strictly 4.5 V to 5.5 V. Exceeding 5.5 V risks accelerated parametric drift and reduced reliability-even brief overvoltage events above +7.0 V may cause permanent damage. Input voltage must also stay within −1.2 V to +7.0 V to avoid violating clamping current limits (IIK ≤ −18 mA).
Can the 74ABT646APW,118 be used in automotive applications?
The 74ABT646APW,118 is qualified for industrial temperature range (−40 °C to +85 °C) and meets JESD78B latch-up and HBM ESD standards, but it is not AEC-Q100 qualified. NXP explicitly states that this device is not designed, authorized, or warranted for automotive safety-critical systems such as engine control, braking, or airbag deployment. For automotive use, designers must consult NXP's dedicated automotive-grade logic portfolio and obtain formal qualification documentation before integration.
74ABT646APW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
74ABT646APW,118 FAQ
1.How can I place an order for 74ABT646APW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT646APW,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 74ABT646APW,118 reliable?
The price and inventory of 74ABT646APW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT646APW,118 is usually 5 days.
3.What payment methods are accepted for 74ABT646APW,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT646APW,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT646APW,118?
74ABT646APW,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT646APW,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 74ABT646APW,118?
For technical support, including 74ABT646APW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT646APW,118 requirements.
6.How does Aetrix verify that 74ABT646APW,118 is sourced from the original manufacturer or authorized distributors?
All 74ABT646APW,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 74ABT646APW,118 meets industry standards.
7.What is the process for return or replacement of 74ABT646APW,118?
All 74ABT646APW,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT646APW,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 74ABT646APW,118 part is unused and in its original packaging.
Return procedure for 74ABT646APW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74ABT646APW,118 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
