DS1685EN-5+ Equivalent & Substitute Parts

Part Overview

The DS1685EN-5+ is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality manufactured by Analog Devices Inc./Maxim Integrated. This Surface Mount device operates in the 24-TSSOP package and provides 242 bytes of NVSRAM with parallel interface connectivity. The part is currently Active in product status and maintains full ROHS3 compliance.

Equivalent and substitute parts are identified when design requirements necessitate alternative packaging formats, different operating voltage ranges, or when primary component availability is constrained. Substitution eligibility is determined strictly by matching electrical specifications, interface protocols, and mechanical compatibility within the Clock/Timing category.

Key Parameters

Parameter	DS1685EN-5+
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Clock/Timing
Type	Clock/Calendar
Package / Case	24-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Interface	Parallel
Memory Size	242B
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Voltage - Supply	4.5V ~ 5.5V
Voltage - Supply, Battery	2.5V ~ 3.7V
Current - Timekeeping (Max)	3mA @ 5V
Operating Temperature	-40°C ~ 85°C
Features	Alarm, NVSRAM, Square Wave Output, Y2K
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the DS1685EN-5+ are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Substitution Criteria:

Interface Type: Parallel protocol compatibility
Time/Date Format: HH:MM:SS and YY-MM-DD-dd support
Product Status: Active manufacturing status
RoHS Compliance: ROHS3 Compliant certification
Package Category: Surface Mount or Through Hole configurations

Secondary Compatibility Factors:

Voltage Supply Range: Operating voltage envelope
Operating Temperature Range: Thermal operating window
Feature Set: Presence of Alarm, Watchdog Timer, Supervisor, or Y2K functionality
Mounting Technology: Surface Mount (TSSOP, SOP, BSOP) or Through Hole (DIP)

The following parts meet substitution criteria within the Clock/Timing category:

DS1685EN-5+ (Direct equivalent - same part number)
BQ4802LYPW (Texas Instruments - 28-TSSOP package variant)
M48T08-150PC1 (STMicroelectronics - 28-DIP Through Hole alternative)
M48T201V-85MH1F (STMicroelectronics - 44-BSOP Surface Mount variant)
M48T35Y-70MH1F (STMicroelectronics - 28-SOP Surface Mount variant)

Parameter Comparison

Parameter	DS1685EN-5+	BQ4802LYPW	M48T08-150PC1	M48T201V-85MH1F	M48T35Y-70MH1F
Manufacturer	Analog Devices Inc./Maxim Integrated	Texas Instruments	STMicroelectronics	STMicroelectronics	STMicroelectronics
Category	Clock/Timing	Clock/Timing	Clock/Timing	Clock/Timing	Clock/Timing
Type	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar
Package / Case	24-TSSOP	28-TSSOP	28-DIP Module	44-BSOP	28-SOP
Mounting Type	Surface Mount	Surface Mount	Through Hole	Surface Mount	Surface Mount
Interface	Parallel	Parallel	Parallel	Parallel	Parallel
Time Format	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
Voltage - Supply	4.5V ~ 5.5V	2.7V ~ 3.6V	4.75V ~ 5.5V	3V ~ 3.6V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Current - Timekeeping (Max)	3mA @ 5V	1.5mA (Typ) @ 2.7V ~ 3.6V	3mA @ 4.7V ~ 5.5V	2mA @ 3V ~ 3.6V	2mA @ 4.75V ~ 5.5V
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, qualifying them for direct substitution within the Clock/Timing category when specific design constraints are present.

DS1685EN-5+ (Primary): Recommended for designs requiring extended operating temperature range (-40°C to 85°C) and 12/24-hour time format support. Surface Mount 24-TSSOP package provides compact footprint for high-density PCB layouts.

BQ4802LYPW (Texas Instruments): Suitable for low-voltage applications operating within 2.7V to 3.6V supply envelope. Features integrated Supervisor and Watchdog Timer functionality. 28-TSSOP package requires PCB layout modification from DS1685EN-5+.

M48T08-150PC1 (STMicroelectronics): Applicable for Through Hole mounting requirements and legacy board designs. 28-DIP package accommodates socket-based installations. Operating temperature limited to 0°C to 70°C. Timekeeper® series designation indicates STMicroelectronics manufacturing lineage.

M48T201V-85MH1F (STMicroelectronics): Specified for 3V to 3.6V supply applications with enhanced feature integration including Supervisor and Watchdog Timer. 44-BSOP package requires SNAPHAT socket accommodation. Moisture Sensitivity Level 3 (168 Hours) requires controlled storage conditions.

M48T35Y-70MH1F (STMicroelectronics): Designated for 4.5V to 5.5V supply range matching DS1685EN-5+ voltage envelope. 28-SOP package with SNAPHAT Sockets provides intermediate pin-count option. Timekeeper® series with Leap Year support.

Frequently Asked Questions (FAQ)

Q: Can BQ4802LYPW directly replace DS1685EN-5+ on existing PCBs?

A: No. BQ4802LYPW uses 28-TSSOP packaging versus DS1685EN-5+ 24-TSSOP. Pin count and footprint differ, requiring PCB layout redesign. Voltage supply range also differs (2.7V-3.6V vs. 4.5V-5.5V).

Q: What is the primary difference between Surface Mount and Through Hole substitutes?

A: Surface Mount variants (TSSOP, SOP, BSOP) mount directly to PCB pads using reflow soldering. Through Hole variants (DIP) insert into socket connectors or drilled holes using wave soldering. M48T08-150PC1 is the only Through Hole option in this substitute list.

Q: Does M48T201V-85MH1F require special handling?

A: Yes. M48T201V-85MH1F carries Moisture Sensitivity Level 3 (168 Hours), requiring controlled storage at specified humidity and temperature conditions. DS1685EN-5+ carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed parts maintain ROHS3 Compliant certification and Active product status, meeting current environmental and regulatory requirements.

Q: Which substitute supports the widest operating temperature range?

A: DS1685EN-5+ supports -40°C to 85°C. All other substitutes operate within 0°C to 70°C range, limiting applicability in extended temperature environments.

Q: Can substitutes be intermixed on the same PCB?

A: No. Each substitute requires distinct PCB footprint, voltage supply routing, and socket accommodation. Board design must standardize on a single part number per application.

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