M48T559YMH1TR STMicroelectronics Integrated Circuit (Small Outline Packages) In Stock
M48T559YMH1TR is a 512 Kbit (64 K x 8) TIMEKEEPER SRAM from STMicroelectronics with an integrated real-time clock, watchdog timer, and on-chip lithium cell, housed in a 28-pin SO package. It operates from 4.5 V to 5.5 V and retains data for up to 10 years, ideal for industrial controllers and telecommunications equipment requiring non-volatile timekeeping memory.
- Manufacturer
- STMicroelectronics
- Package
- Small Outline Packages
- Pin Count
- 28
- Lifecycle
- OBSOLETE
- Datasheet
- M48T559YMH1TR Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of M48T559YMH1TR?
- 512 Kbit (64 K x 8) battery-backed SRAM with integrated lithium cell
- On-chip real-time clock with century register and leap-year compensation
- Watchdog timer with selectable timeout periods
- Data retention up to 10 years from integrated lithium source
- Operating supply 4.5 V to 5.5 V with 70 ns access time
- 28-pin SO package for drop-in compatibility with standard SRAM
What is M48T559YMH1TR used for?
The M48T559YMH1TR is used in industrial programmable logic controllers, telecom switching equipment, and network routers that require both fast SRAM access and reliable non-volatile timekeeping without external batteries. Its integrated 10-year lithium cell eliminates the need for external backup circuitry, simplifying board design and improving long-term reliability in harsh environments. It also suits legacy military and aerospace systems where discrete battery management is impractical.
What are the specifications of M48T559YMH1TR?
| Pbfree Code | No |
| YTEOL | 0 |
| Memory IC Type | STANDARD SRAM |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.32.00.41 |
Where can I find the M48T559YMH1TR datasheet?
M48T559YMH1TR Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for M48T559YMH1TR?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How should engineers size this memory device in a legacy controller design?
It provides 512 Kbit organized as 64 K x 8 SRAM, so teams should verify address map needs before qualifying it for non-volatile timekeeping storage.
Which power requirements should be checked before substitution?
Confirm the target board supports the 4.5 V to 5.5 V operating range, because lower-voltage replacements may not match the existing power architecture.
What lifecycle risk should procurement consider for production support?
Because this device is marked obsolete with YTEOL 0, sourcing teams should plan last-time-buy coverage and validate any 28-pin SO alternates carefully.
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Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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