DS2502/T&R EPROM 1-Wire Memory IC Equivalent & Substitute Parts

Part Overview

The DS2502/T&R is a 1Kbit EPROM OTP (One-Time Programmable) memory IC manufactured by Analog Devices Inc./Maxim Integrated, packaged in TO-92-3 form factor with 1-Wire interface protocol. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design requirements and production continuity. The part operates across a supply voltage range of 2.8V to 6V and supports industrial temperature ranges from -40°C to 85°C.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile
Memory Format	EPROM
Technology	EPROM - OTP
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	1-Wire®
Voltage - Supply	2.8V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Supplier Device Package	TO-92-3

Substitute Part Grouping Explanation

Substitution eligibility for the DS2502/T&R is determined by strict equivalence across the following critical parameters:

Memory capacity: 1Kbit (128 x 8 organization)
Interface protocol: 1-Wire® communication standard
Package type: TO-92-3 form factor with through-hole mounting
Supply voltage range: 2.8V to 6V compatibility
Operating temperature range: -40°C to 85°C minimum coverage
Memory technology: EPROM OTP non-volatile storage

The identified substitute maintains identical electrical and mechanical specifications, differing only in product status classification and packaging format (tape reel versus tube).

Parameter Comparison

Parameter	DS2502/T&R (Main Part)	DS2502+T&R (Substitute)
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Memory Type	Non-Volatile	Non-Volatile
Memory Format	EPROM	EPROM
Technology	EPROM - OTP	EPROM - OTP
Memory Size	1Kbit	1Kbit
Memory Organization	128 x 8	128 x 8
Memory Interface	1-Wire®	1-Wire®
Voltage - Supply	2.8V ~ 6V	2.8V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Supplier Device Package	TO-92-3	TO-92-3
Product Status	Obsolete	Active
Packaging Format	Tube (T&R)	Cut Tape (CT)
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The DS2502+T&R serves as the direct functional equivalent for DS2502/T&R applications. Selection between these parts should be based on the following criteria:

Product Status Consideration: The DS2502/T&R is classified as obsolete, while DS2502+T&R maintains active product status with confirmed inventory availability (2800 pcs). For new designs or production continuity, DS2502+T&R is the appropriate selection.

Compliance Requirements: DS2502+T&R achieves ROHS3 compliance, whereas DS2502/T&R is RoHS non-compliant. Applications subject to RoHS directives or customer compliance mandates require DS2502+T&R.

Packaging Format: DS2502/T&R is supplied in tube packaging, while DS2502+T&R is available in cut tape format. Packaging selection depends on assembly process requirements and volume handling procedures.

Electrical and Mechanical Equivalence: Both parts are electrically and mechanically identical across all specified parameters, including memory capacity, interface protocol, voltage range, temperature range, and physical form factor.

Frequently Asked Questions (FAQ)

Q: Can DS2502+T&R directly replace DS2502/T&R in existing designs?

A: Yes. Both parts are electrically and mechanically equivalent across all specified parameters: 1Kbit EPROM OTP memory, 1-Wire interface, TO-92-3 package, 2.8V to 6V supply voltage, and -40°C to 85°C operating temperature range.

Q: What is the primary difference between these two part numbers?

A: The primary differences are product status (obsolete versus active), packaging format (tube versus cut tape), and RoHS compliance classification (non-compliant versus ROHS3 compliant). Electrical and mechanical specifications are identical.

Q: Does the packaging format affect circuit performance?

A: No. Packaging format (tube versus cut tape) affects only supply chain logistics and assembly handling procedures. Electrical performance and functional characteristics remain unchanged.

Q: Is RoHS compliance a functional requirement for substitution?

A: RoHS compliance is a regulatory and customer requirement, not a functional electrical parameter. Applications subject to RoHS directives must use DS2502+T&R. Applications without RoHS mandates can use either part based on availability and supply chain considerations.

Q: Are there inventory considerations for part selection?

A: DS2502/T&R (obsolete) has 728 pcs in stock. DS2502+T&R (active) has 2800 pcs in stock. For production continuity and long-term availability, DS2502+T&R is the recommended selection.

Q: Do both parts support identical 1-Wire protocol communication?

A: Yes. Both DS2502/T&R and DS2502+T&R implement the same 1-Wire interface protocol and are fully compatible with identical host controller implementations.

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