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QS74FCT521ATSO

OBSOLETE
Quality Semiconductor

Magnitude Comparator Bit Active Low Output A=B

End of life. Buy from remaining stock or find an alternate.

QS74FCT521ATSO is a Magnitude Comparator Bit Active Low Output A=B from Quality Semiconductor. 1 authorized distributor quotes it on TracedParts, from RM 7.11 at quantity 1, with 11,426 units in stock for immediate despatch. Figures come from the distributors' own APIs, pulled in the catalogue snapshot of 2026-09-25, and are indicative rather than a binding quote.

RoHS COMPLIANTREACH Surface Mount SMD
BEST PRICE @1
RM 7.11
DigiKey · authorized
TOTAL STOCK
11,426
1 source
SHORTEST LEAD
stock
ships from warehouse
AUTHORIZED
1 / 1
tier 1 sources

Who has QS74FCT521ATSO in stock, and what does it cost?

1 authorized distributor · pulled from their APIs in the catalogue snapshot of 2026-09-25
QTY pcs
DISTRIBUTOR
STOCK
MOQ
PRICE BREAKS · MYR
LEAD
@250 PCS
TIER 1 - AUTHORIZED DISTRIBUTORfranchised - full warranty - paperwork QA will accept
AUTH
11,426
170
170+7.1148
stock
ex-warehouse
RM 7.1148
RM 1,778.70 total
Buy ↗
What 250 pcs actually costs landed in Malaysia, duty and SST included: RM 2,003.93 RM 8.0157 per unit, DDP · estimate Open estimator →

What are the specifications of QS74FCT521ATSO?

17 parameters▾
Device specification
TypeIdentity Comparator
Number of Bits8
OutputActive Low
Output FunctionA=B
Voltage - Supply4.75V ~ 5.25V
Operating Temperature0°C ~ 70°C
Mounting TypeSurface Mount
Ordering & compliance
ManufacturerQuality Semiconductor
CategoryComparators
PackageSurface Mount
MountingSurface mount
LifecycleOBSOLETE
RoHSCompliant
Moisture levelNot applicable (through hole)
PackagingTape & reel
Country of origin
HS code

Where can I download the QS74FCT521ATSO datasheet?

link supplied by DigiKey▾
PDF
QS74FCT521ATSO datasheet
link supplied by DigiKey · Quality Semiconductor · English
Open datasheet ↗

This is the datasheet link the distributor returned with the part record. We pass it through as they gave it, and we have not opened it - there are more than 300,000 of these and we verify only the ones we curate by hand. If it does not resolve, that is the distributor’s record, not the part.

What does QS74FCT521ATSO cost landed in Malaysia?

Malaysia · DDP · HS ▾
Goods
Freight · express 2 d
Import duty · 0 % (ITA-exempt)
Sales & service tax · 6 %
Customs clearance
Landed total

Estimate only. The correct HS classification for your import is your responsibility - see terms of service.

Is there a CAD symbol and footprint for QS74FCT521ATSO?

4 downloads▾
SCHEMATIC SYMBOL · .libPCB FOOTPRINT · .kicad_mod 3D MODEL · .stepSPICE · .mod

What can I use instead of QS74FCT521ATSO?

3 in comparators▾
MM74HCT688WMX
National Semiconductor
Magnitude Comparator Bit Active Low Output A=B 20-SO…
36,997
RM 7.11
CD74HC688M
Harris Corporation
Magnitude Comparator Bit Active Low Output A=B 20-SO…
37,417
RM 7.20
CD74HC688MG4
Texas Instruments
Magnitude Comparator Bit Active Low Output A=B 20-SO…
37,417
RM 7.20

Nearest peers by price within the same category. Confirm the parameters before you substitute - these are not guaranteed drop-in replacements.

Which parts are similar to QS74FCT521ATSO?

8 parts▾
LM393SNGLM339SNGLM2903SNGMIC842NYC5NLV14007UBDR2GM51943AHP#CF0JLMV331M7LM2901SNG

Common questions about QS74FCT521ATSO

7 questions▾
Is QS74FCT521ATSO in stock?
Yes. 11,426 units are in stock across 1 authorized distributor (DigiKey), as of the catalogue snapshot of 2026-09-25.
How much does QS74FCT521ATSO cost?
RM 7.1148 is the lowest unit price on this page, from DigiKey. Prices fall as quantity rises; the full price break ladder is in the quotes table. Figures come from the distributor API and are indicative, not a binding quote.
Who supplies QS74FCT521ATSO?
DigiKey. It is authorized, franchised distributor quoting through its own API. TracedParts carries no broker or open-market listings.
How old are these prices?
The catalogue is re-pulled from the distributors' APIs once a day, and the line under the Quotes heading says which pull the figures on this page came from. Prices and stock can move between pulls, so treat them as indicative and confirm on the distributor's site before you order.
Who quoted these prices?
Every row on the site comes from an authorized, franchised distributor through its own API: DigiKey, Mouser or element14. There are no broker or open-market listings on TracedParts. If a source ever changes, the row will say so.
Why do you show the source before the price?
Because who sold it decides what happens at incoming inspection, and a table sorted by price alone hides that. Rows are grouped by the distributor's status first and ordered by unit price inside the group.
Why are prices in ringgit?
Distributors quote in US dollars. TracedParts converts to MYR at a fixed reference rate that is printed on the page, not a live FX feed, so the ringgit figure is a sourcing estimate rather than the amount you will be billed.