DS1501YN Real Time Clock IC - Equivalent & Substitute Parts

Part Overview

The DS1501YN is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This 28-DIP parallel interface device provides 256 bytes of NVSRAM with comprehensive timekeeping features including alarm, leap year compensation, square wave output, and watchdog timer capabilities. The DS1501YN is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new production alternatives. The substitute parts listed maintain functional compatibility through matching electrical specifications and package form factors while offering active product status from alternative manufacturers.

Substiute Parts

DS1501YN

Analog Devices Inc./Maxim IntegratedIn Stock: 1268DS1501YN Datasheet

Current PartRFQ

DS1501YN+

Analog Devices Inc./Maxim IntegratedIn Stock: 1212DS1501YN+ Datasheet

DirectRFQ

M48T18-150PC1

STMicroelectronicsIn Stock: 1310M48T18-150PC1 Datasheet

MFR RecommendedRFQ

M48T35AV-10PC1

STMicroelectronicsIn Stock: 1390M48T35AV-10PC1 Datasheet

MFR RecommendedRFQ

M48T35Y-70PC1

STMicroelectronicsIn Stock: 3110M48T35Y-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS1501YN is determined by the following critical parameters:

Primary Compatibility Criteria:

• Package / Case: 28-DIP (0.600", 15.24mm) form factor
• Mounting Type: Through Hole
• Interface: Parallel
• Time Format: HH:MM:SS (24 hr)
• Date Format: YY-MM-DD-dd
• RoHS Status: ROHS3 Compliant

Electrical Compatibility Criteria:

• Voltage - Supply range must encompass or match 4.5V ~ 5.5V
• Voltage - Supply, Battery range must encompass or match 2.5V ~ 3.7V
• Current - Timekeeping specifications must be evaluated against application requirements
• Operating Temperature range must support -40°C ~ 85°C or applicable subset

The substitute parts are grouped into two categories based on manufacturer and product status:

Category 1: Direct Manufacturer Variant

• DS1501YN+: Identical electrical and functional specifications to DS1501YN, differing only in packaging (Tube vs. standard) and product status (Not For New Designs)

Category 2: Alternative Manufacturer Substitutes (STMicroelectronics Timekeeper® Series)

• M48T18-150PC1: Active product with matching 4.5V ~ 5.5V supply range and parallel interface; reduced timekeeping current (3mA vs. 5mA); operating temperature 0°C ~ 70°C
• M48T35Y-70PC1: Active product with matching 4.5V ~ 5.5V supply range and parallel interface; reduced timekeeping current (2mA vs. 5mA); operating temperature 0°C ~ 70°C
• M48T35AV-10PC1: Active product with 3V ~ 3.6V supply range (different from primary); reduced timekeeping current (2mA vs. 5mA); operating temperature 0°C ~ 70°C

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): DS1501YN+ provides identical electrical and functional performance to the DS1501YN. However, its product status of "Not For New Designs" indicates limited long-term availability. This variant is suitable only for legacy system maintenance where existing inventory or short-term supply is available.

For Active Product Substitution:

M48T18-150PC1 and M48T35Y-70PC1 are both active STMicroelectronics Timekeeper® series products with matching 4.5V ~ 5.5V supply voltage and parallel interface compatibility. Both devices support the required HH:MM:SS (24 hr) and YY-MM-DD-dd time/date formats. The primary trade-off is operating temperature range: these alternatives support 0°C ~ 70°C versus the DS1501YN's -40°C ~ 85°C. Selection between M48T18-150PC1 and M48T35Y-70PC1 depends on application power budget, as M48T35Y-70PC1 offers lower timekeeping current (2mA vs. 3mA).

M48T35AV-10PC1 operates at 3V ~ 3.6V supply voltage, making it suitable only for applications where the primary system voltage is 3.3V or lower. This device is not compatible with 5V systems without additional voltage regulation.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original DS1501YN.

Frequently Asked Questions (FAQ)

Q: Can DS1501YN+ be used as a direct replacement for DS1501YN? A: Yes. DS1501YN+ provides identical electrical specifications, time/date formats, and package form factor. The only differences are packaging type (Tube) and product status designation. However, DS1501YN+ is marked "Not For New Designs," indicating limited future availability.

Q: What is the primary limitation of STMicroelectronics M48T18-150PC1 and M48T35Y-70PC1 substitutes? A: Operating temperature range is reduced to 0°C ~ 70°C compared to DS1501YN's -40°C ~ 85°C. Applications requiring extended temperature operation below 0°C or above 70°C cannot use these substitutes. Both devices maintain parallel interface compatibility and matching 4.5V ~ 5.5V supply voltage.

Q: Is M48T35AV-10PC1 compatible with 5V systems? A: No. M48T35AV-10PC1 operates at 3V ~ 3.6V supply voltage and is not compatible with 5V systems. This device is suitable only for 3.3V applications. Use M48T18-150PC1 or M48T35Y-70PC1 for 5V system compatibility.

Q: How do timekeeping current specifications affect substitute selection? A: DS1501YN draws 5mA maximum during timekeeping operation. M48T18-150PC1 draws 3mA, and M48T35Y-70PC1 draws 2mA. Lower current consumption reduces battery drain in backup power scenarios. Selection should consider application power budget and battery life requirements.

Q: Are all substitute parts RoHS compliant? A: Yes. DS1501YN, DS1501YN+, M48T18-150PC1, M48T35Y-70PC1, and M48T35AV-10PC1 are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the difference between 28-DIP and 28-DIP Module packaging? A: Both form factors are 28-pin dual inline packages with 0.600" (15.24mm) body width and through-hole mounting. The "Module" designation for STMicroelectronics parts indicates integrated module construction (CAPHAT®). Pin compatibility and PCB footprint are identical.

Q: Can substitute parts be used interchangeably in existing DS1501YN designs? A: DS1501YN+ provides complete interchangeability. STMicroelectronics alternatives (M48T18-150PC1, M48T35Y-70PC1, M48T35AV-10PC1) require verification of operating temperature requirements and supply voltage compatibility. Parallel interface, time/date format, and package form factor are compatible across all substitutes.