800-219-9001 RFQ
Image may not represent
actual part
UNB

BCY59

Bipolar Transistor · TO-18 · Discrete Semiconductor
Part Status: Obsolete In demand
Data last refreshed Jun 20, 2026
Manufacturer
UNB
Mfr Part #
BCY59
Category
Bipolar Transistor
Datasheet
View datasheet ↗
Availability & Pricing
ZDI Price$1.65
Last transacted2003-05-02
Market range$1.65
Sourcing channels26
Request a Quote → Check Live Availability

Live pricing on request · most quotes same business day

Specifications

Physical & Thermal
Package / CaseTO-18
Mounting TypeThrough Hole
Classification & Lifecycle
CategoryBipolar Transistor
TypeDiscrete Semiconductor
Part StatusObsolete

NPN silicon BJT

Availability & Sourcing

26 sources
SourceMfrQtyDate CodeConditionStatus
Live UNB 6101 — — Live RFQ
Live — 3071 — — Live RFQ
Live ZETEX 944 — — Live RFQ
Live Rectron Semiconductor 677 — — Live RFQ
Live TFK 188 8247 — Live RFQ
Live Microchip Technology 173 — — Live RFQ
Live WW 45 — — Live RFQ
Live AMS NJS 44 0813 — Live RFQ
Live ST 11200 25+ — Live RFQ
Live MICROCHIP 500 25+ — Live RFQ
Live ST 1000 0626+;16 — Live RFQ
Live ST 98 0626+;16 — Live RFQ
Live Rectron 677 — — Live RFQ
Market UNB 6101 — — Available RFQ
Market UNB 3071 — — Available RFQ
Market ZETEX 944 — — Available RFQ
Market Rectron Semicon 677 — — Available RFQ
Market TFK 188 8247 — Available RFQ
Market Microchip Techn 173 — — Available RFQ
Market AMS NJS 44 0813 — Available RFQ
Market ST 11200 25+ — Available RFQ
Market ST 1000 0626+;16 — Available RFQ
Market ST 98 0626+;16 — Available RFQ
Market Rectron 677 — — Available RFQ
Market UNB 6667 — — Available RFQ
Market ST 6482 — — 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$1.65
Low$1.65
Last$1.65
Price as of2003-05-02

ZDI Transaction

Last ZDI price$1.65
As of2003-05-02
Active offers26

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

Part Activity

recent searches, RFQs & offers
BCY59 viewed on the web · Web User
BCY59 viewed on the web · Web User
BCY59 viewed on the web · Web User
BCY59 viewed on the web · Web User
BCY59 viewed on the web · Web User
BCY59 viewed on the web · Web User
BCY59 viewed on the web · Web User
BCY59 viewed on the web · Web User

Recent search and sourcing activity for BCY59.

Engineering FAQ

BCY59 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 package is BCY59 supplied in?
BCY59 is supplied in the TO-18 package, through hole.
Can ZDI source BCY59 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

BCY59 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 UNB

Need BCY59?

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

Request a Quote →