BQ4013MA-85 NVSRAM 1Mbit Parallel Memory IC Equivalent & Substitute Parts

Part Overview

The BQ4013MA-85 is a Non-Volatile SRAM (NVSRAM) memory IC manufactured by Texas Instruments, providing 1Mbit storage capacity in a 128K x 8 parallel organization with 85 ns access time. The device is packaged in a 32-DIP module format and operates across the 4.75V to 5.5V supply range at 0°C to 70°C.

This part is classified as obsolete. Equivalent and substitute parts from Analog Devices Inc./Maxim Integrated are available to maintain design continuity and ensure component availability for legacy system support and new production requirements.

Key Parameters

Parameter	BQ4013MA-85
Memory Type	Non-Volatile SRAM (NVSRAM)
Memory Size	1Mbit
Memory Organization	128K x 8
Memory Interface	Parallel
Access Time	85 ns
Write Cycle Time	85 ns
Voltage Supply Range	4.75V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	32-DIP Module (0.610", 15.49mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BQ4013MA-85 is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Type: Non-Volatile SRAM (NVSRAM)
Memory Size: 1Mbit
Memory Organization: 128K x 8
Memory Interface: Parallel
Mounting Type: Through Hole
Package Format: 32-DIP Module

Performance Flexibility:

Access Time: Equal to or faster than 85 ns (70 ns, 85 ns acceptable)
Write Cycle Time: Equal to or faster than 85 ns (70 ns, 85 ns acceptable)

Electrical Compatibility:

Voltage Supply Range: Must encompass or be compatible with 4.75V ~ 5.5V
Operating Temperature: Must support minimum 0°C ~ 70°C range

All substitute parts listed maintain identical memory capacity, organization, and parallel interface architecture. Differences in access time, supply voltage range, and operating temperature define specific application suitability.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Organization	Access Time (ns)	Write Cycle (ns)	Voltage Supply	Operating Temp	Package	Product Status
BQ4013MA-85	Texas Instruments	1Mbit	128K x 8	85	85	4.75V ~ 5.5V	0°C ~ 70°C	32-DIP Module	Obsolete
DS1245AB-70+	Analog Devices Inc./Maxim	1Mbit	128K x 8	70	70	4.75V ~ 5.25V	0°C ~ 70°C	32-EDIP	Active
DS1245AB-70IND+	Analog Devices Inc./Maxim	1Mbit	128K x 8	70	70	4.75V ~ 5.25V	-40°C ~ 85°C	32-EDIP	Active
DS1245AB-85+	Analog Devices Inc./Maxim	1Mbit	128K x 8	85	85	4.75V ~ 5.25V	0°C ~ 70°C	32-EDIP	Active
DS1245AB-100+	Analog Devices Inc./Maxim	1Mbit	128K x 8	100	100	4.75V ~ 5.25V	0°C ~ 70°C	32-EDIP	Active
DS1245AB-120+	Analog Devices Inc./Maxim	1Mbit	128K x 8	120	120	4.75V ~ 5.25V	0°C ~ 70°C	32-EDIP	Active
DS1245Y-70IND+	Analog Devices Inc./Maxim	1Mbit	128K x 8	70	70	4.5V ~ 5.5V	-40°C ~ 85°C	32-EDIP	Active
DS1245Y-85+	Analog Devices Inc./Maxim	1Mbit	128K x 8	85	85	4.5V ~ 5.5V	0°C ~ 70°C	32-EDIP	Active
DS1245Y-100+	Analog Devices Inc./Maxim	1Mbit	128K x 8	100	100	4.5V ~ 5.5V	0°C ~ 70°C	32-EDIP	Active
DS1245Y-120+	Analog Devices Inc./Maxim	1Mbit	128K x 8	120	120	4.5V ~ 5.5V	0°C ~ 70°C	32-EDIP	Active
DS1245Y-120IND+	Analog Devices Inc./Maxim	1Mbit	128K x 8	120	120	4.5V ~ 5.5V	-40°C ~ 85°C	32-EDIP	Active

Engineering Selection Recommendations

Primary Equivalent (Matching Specifications): DS1245AB-85+ provides the closest functional match to BQ4013MA-85, with identical 85 ns access and write cycle times, matching operating temperature range (0°C ~ 70°C), and compatible supply voltage (4.75V ~ 5.25V). This part is active and ROHS3 compliant.

Performance-Enhanced Alternatives: DS1245AB-70+ and DS1245AB-70IND+ offer faster 70 ns performance while maintaining 1Mbit capacity and parallel interface. DS1245AB-70IND+ extends operating temperature to -40°C ~ 85°C for industrial applications.

Extended Temperature Range Options: DS1245AB-70IND+, DS1245Y-70IND+, DS1245Y-120IND+, and DS1245Y-120+ support -40°C ~ 85°C operating range for applications requiring extended thermal performance.

Broader Supply Voltage Compatibility: DS1245Y series (DS1245Y-70IND+, DS1245Y-85+, DS1245Y-100+, DS1245Y-120+, DS1245Y-120IND+) accommodates 4.5V ~ 5.5V supply range, providing wider voltage tolerance than DS1245AB series (4.75V ~ 5.25V).

All substitute parts are active products with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and environmental regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can DS1245AB-85+ directly replace BQ4013MA-85 in existing designs? A: DS1245AB-85+ is functionally equivalent with matching 85 ns timing and 0°C ~ 70°C operating range. Both are 32-DIP module packages with 1Mbit parallel NVSRAM architecture. Verify PCB footprint compatibility, as package dimensions differ slightly (BQ4013MA-85: 0.610" vs DS1245AB-85+: 0.600").

Q: What is the difference between DS1245AB and DS1245Y series? A: The primary difference is supply voltage range. DS1245AB series operates 4.75V ~ 5.25V, while DS1245Y series operates 4.5V ~ 5.5V. Both maintain identical memory capacity, organization, and parallel interface. DS1245Y provides broader voltage tolerance for systems with variable supply conditions.

Q: Are faster parts (70 ns) backward compatible with 85 ns designs? A: Yes. Faster access time (70 ns) is backward compatible with designs specified for 85 ns operation. The system will function correctly with improved performance margins. No design changes are required.

Q: What does the "IND" suffix indicate? A: The "IND" suffix denotes industrial-grade temperature range (-40°C ~ 85°C) versus commercial range (0°C ~ 70°C). Select IND variants for applications requiring extended thermal operation or harsh environment deployment.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL 1 (unlimited moisture sensitivity) rating, meeting current environmental and reliability standards.

Q: What is the package difference between 32-DIP Module and 32-EDIP? A: Both are 32-pin through-hole packages with identical pin count and parallel interface. EDIP (Enhanced DIP) represents a refined package specification. Physical dimensions vary slightly; verify PCB footprint compatibility before substitution.

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