800-219-9001 RFQ
KS8721B — TQFP/LQFP-32/44 package (representative)
TQFP/LQFP-32/44
Representative of package type
Micrel Semiconductor

KS8721B

Ethernet PHY Transceiver · 48-LQFP · Interface
Part Status: Obsolete In demand
Data last refreshed Jun 18, 2026
Manufacturer
Micrel Semiconductor
Mfr Part #
KS8721B
Series
KS8721
Category
Ethernet PHY Transceiver
Datasheet
View datasheet ↗
Availability & Pricing
ZDI Price$3.35
Last transacted2004-01-07
Market range$3.35
Sourcing channels23
Request a Quote → Check Live Availability

Live pricing on request · most quotes same business day

Product Attributes

Electrical & Parametric
Data Rate10/100 Mbps
Supply Voltage3.3 V
Physical & Thermal
Package / Case48-LQFP
Mounting TypeSurface Mount
SeriesKS8721
Operating Temperature0°C ~ 70°C
Classification & Lifecycle
CategoryEthernet PHY Transceiver
TypeInterface
Part StatusObsolete

3.3V 10/100BASE-TX/FX Physical Layer Transceiver

Availability & Sourcing

23 sources
SourceMfrQtyDate CodeConditionStatus
Market MICREL 2900 2003+ — Available RFQ
Market MICREL 2000 — — Available RFQ
Market MICREL 1032 — — Available RFQ
Market MICREL 405 — — Available RFQ
Market KENDIN 239 2004 — Available RFQ
Market — 210 — — Available RFQ
Market MICREL 150 — — Available RFQ
Market Microchip Techn 136 — — Available RFQ
Market Kendin 103 0515 — Available RFQ
Market KENDIN 43 409 — Available RFQ
Market MICRELL 34 — — Available RFQ
Market KENDIN 32 0220 — Available RFQ
Market MICREL 26 — — Available RFQ
Market KENDIN 20 0231 — Available RFQ
Market KENDIN 10 1013 — Available RFQ
Market KENDIN 9 — — Available RFQ
Market KEND 2 NON-ROHS — Available RFQ
Market KENDIN 1821 03+ — Available RFQ
Market KENDIN 7000 — — Available RFQ
Market MIC 6017 04+ — Available RFQ
Market MICREL 5640 02+ — Available RFQ
Market KENDIN 5470 0242+ — Available RFQ
Market Kendin 103 200515 — Available RFQ

ZDI Stock — in our warehouse · Market — offers available through our sourcing network · Live — recent offers from our sourcing network.

Price History & Market Reference

Market Price Range

High$3.35
Low$3.35
Last$3.35
Price as of2004-01-07

ZDI Transaction

Last ZDI price$3.35
As of2004-01-07
Active offers23

Pricing reflects ZDI's transaction and market-reference data. Firm pricing confirmed per RFQ against current availability.

Part Activity

recent searches, RFQs & offers
KS8721B viewed on the web · Web User
KS8721B viewed on the web · Web User
KS8721B viewed on the web · Web User
KS8721B viewed on the web · Web User
KS8721B viewed on the web · Web User
KS8721B viewed on the web · Web User
KS8721B viewed on the web · Web User
KS8721B viewed on the web · Web User

Recent search and sourcing activity for KS8721B.

Engineering FAQ

KS8721B is marked Obsolete — how does ZDI assure authenticity?
Obsolete and end-of-life parts carry elevated counterfeit risk, which is exactly why ZDI routes every lot through the full EQuality Process™ — validation, QI-1 and QI-2/camera inspection, RoHS verification, bake and bag-and-tag, and QI-3 final inspection — with source-country supplier vetting and full lot traceability before release.
What are the key specifications of KS8721B?
Data Rate: 10/100 Mbps; Supply Voltage: 3.3 V.
What package is KS8721B supplied in?
KS8721B is supplied in the 48-LQFP package, surface mount, rated 0°C ~ 70°C.
Can ZDI source KS8721B beyond the quantities shown?
Yes — ZD Integrated Circuits specializes in sourcing hard-to-find, obsolete, and excess electronic components through its global network, with counterfeit-avoidance inspection on every lot. Submit an RFQ with your target quantity for availability and pricing.

Documents & Media

Quality & Counterfeit Avoidance

ISO 9001 ERAI Member ESD Certified GIDEP Participant ZDI EQuality Process CAGE Code 1V8K2

ZD Integrated Circuits operates an ISO 9001-certified quality system incorporating JEDEC-standard process-control elements. In an era of global sourcing and internet procurement, standards compliance alone no longer assures component authenticity — so ZDI pioneered a multi-layered counterfeit-avoidance program: supplier analysis at the source-country level, detailed component analysis, defined inspection standards for all incoming devices, and stringent supplier rating and review. These programs let ZDI guarantee the integrity and the source of every component it ships.

Every lot moves through ZDI's EQuality Process™ — validation, QI-1 and QI-2/camera inspection, RoHS verification, bake and bag-and-tag, and QI-3 final inspection — with Quality-Manager disposition before release. Nonconforming material is quarantined; conforming material is warehoused or shipped.

✓Multi-stage EQuality Process™ inspection (QI-1 · QI-2/camera · QI-3)
✓Source-country supplier analysis, rating & review
✓Incoming inspection, RoHS verification, bake, full lot traceability
✓ESD-controlled handling · authentic parts guaranteed

KS8721B is marked Obsolete. Obsolete and end-of-life parts carry elevated counterfeit risk — exactly why ZDI routes them through the full EQuality Process™ with source-country supplier vetting, inspection, and traceability.

Related Parts

from Micrel Semiconductor

Need KS8721B?

ZD Integrated Circuits sources hard-to-find, obsolete, and excess components worldwide — pricing and availability, fast.

Request a Quote →