SN74F521DWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74F521DWG4 is an 8-bit identity comparator from Texas Instruments in the F/FAST logic family with inverted output. It compares two 8-bit words and drives an active-low output when inputs are equal, housed in a 20-pin SOIC package. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74F521DWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74F521DWG4?
- 8-bit word identity comparison with active-low output
- F/FAST logic family for high-speed switching performance
- 20-pin SOIC package with 50 pF load capacitance spec
- Inverted (active-low) output polarity for wired-OR bus architectures
- Single-function design simplifying address decode and data verification logic
What is SN74F521DWG4 used for?
The SN74F521DWG4 is used in address decoding, memory management units, and bus arbitration circuits where fast comparison of 8-bit data or address words is required. Its inverted output integrates directly with active-low chip-select and enable lines common in microprocessor bus systems. Industrial automation PLCs and data acquisition backplanes also use it for real-time word matching in high-speed digital logic designs.
What are the specifications of SN74F521DWG4?
| YTEOL | 0 |
| Family | F/FAST |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | IDENTITY COMPARATOR |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 32mA |
| Propagation Delay (tpd) | 11ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Where can I find the SN74F521DWG4 datasheet?
SN74F521DWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74F521DWG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the inverted output of the SN74F521DWG4 simplify address decoding in a microprocessor system?
The SN74F521DWG4 drives an active-low output when the two 8-bit input words match, directly compatible with the active-low chip-select inputs of SRAM and peripheral ICs. This eliminates the need for an additional inverter gate, reducing component count and propagation delay in address-decode chains operating at F/FAST switching speeds with 50 pF load capacitance.
What logic supply voltage range does the SN74F521DWG4 operate on and how does it compare to CMOS-level comparators?
The SN74F521DWG4 operates on a 5 V supply typical of the F/FAST TTL logic family, providing guaranteed output voltage levels of VOH ≥ 2.7 V and VOL ≤ 0.5 V. Compared to 3.3 V CMOS comparators, it offers higher drive current and faster propagation times suited to legacy 5 V backplane and bus systems with 50 pF trace capacitances.
For a bus-monitoring application, how many data lines can the SN74F521DWG4 monitor in a single package?
The SN74F521DWG4 compares 8 bits across two 8-bit input ports (16 input pins total) within a single 20-pin SOIC package, making it suitable for monitoring one full byte of a data bus per device. Multiple units can be cascaded to cover 16-bit or 32-bit buses by combining their active-low outputs with a wired-AND connection.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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