6ES7952-1KY00-0AA0 | SIMATIC S7-300 / C7 MMC Memory Card 64 MB — Micro Memory Card (MMC)
6ES7952-1KY00-0AA0 SIMATIC S7-300 & C7 Micro Memory Card (MMC), 64 MB Flash, 3.3 V, for CPU 312 and above + OP/TP 170/270/370. Long-life EEPROM, requires PG/PC or CPU for formatting.
Product Overview
6ES7952-1KY00-0AA0 is a SIMATIC S7-300 / C7-series Micro Memory Card (MMC) with 64 MB (512 Mbit) non-volatile Flash memory. It serves as the mandatory operating memory + load memory for S7-300 CPUs (from CPU 312 onward) and is also used for storing recipes, data logs, and as a firmware update carrier. The card operates at 3.3 V, uses a 24-pin proprietary MMC form factor (not standard SD), and must be formatted by the S7-300 CPU or via a PG/PC with STEP 7 — it cannot be formatted in a PC card reader. Compatible with S7-300 CPUs, C7 all-in-one units, and certain TP/OP 170/270/370 HMI panels (as recipe/alibi memory).
Technical Specifications (Memory & Electrical)
| Parameter | Specification |
| Order Number | 6ES7952-1KY00-0AA0 |
| Product Family | SIMATIC S7-300 — Micro Memory Card (MMC) |
| Memory Capacity | 64 MB (≈ 512 Mbit usable Flash) |
| Technology | NAND Flash EEPROM (non-volatile) |
| Operating Voltage | 3.3 V DC (supplied by CPU / PG slot) |
| Interface / Pinout | 24-pin proprietary MMC (not SD/MMC standard) |
| Write Cycles (Endurance) | ≥ 100,000 erase/write cycles per sector |
| Data Retention | ≥ 10 years @ 40 °C (typical) |
| Typical Use Cases | User program (Load Memory), DB storage, Recipes, Firmware Update, HMI backup |
Technical Specifications (Compatibility & Mechanical)
| Parameter | Specification |
| Compatible Controllers | S7-300 CPUs: 312, 313C, 314C, 315-2DP/PN, 317-2DP/PN, 319-3PN/DP (all MMC-based S7-300) |
| Compatible HMI / C7 | C7-613/633/635/636/637; TP/OP 170A/B, TP/OP 270, TP/OP 370 (as recipe/alibi memory card) |
| NOT Compatible With | S7-200 (uses S7-200 MC / 24xx cards), S7-400 (uses FEPROM/SIMATIC MMC ≠ this type), older S5 |
| Format Requirement | Must be formatted by S7-300 CPU in STOP mode or via STEP 7 PG/PC (Card Reader + Simatic Card Mode) — not readable in Windows card readers |
| Insertion / Removal | Insert with power OFF → power ON CPU to detect; removal only with CPU power OFF |
| Dimensions (L × W × H) | 32 × 24 × 2.1 mm (MMC form factor) |
| Weight (Approx.) | 2 g |
| Ambient Temp. (Storage / Op via CPU) | -40 … +85 °C (storage); card active only inside CPU temp. range |
| Commodity Code / ECCN | 8542 32 00 90 / EAR99 |
| RoHS / REACH | Compliant |
Key Features
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Mandatory for S7-300 MMC-Based CPUs: S7-300 CPUs from CPU 312 (firmware 2.x+) boot and run programs exclusively from the MMC — no card = no RUN.
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64 MB Capacity: Ample for large user programs, data blocks, and recipe storage — also suitable for firmware update files (if <64 MB uncompressed image).
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Long Data Retention & High Endurance: Industrial-grade Flash with 10-year retention and 100 k write cycles — suitable for cyclic data logging (though frequent cyclic writes should use CPU work memory / DBs with retain).
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Single-Source SIMATIC Spare: Identical to what ships with new S7-300 CPUs — direct spare/replacement part.
Typical Applications
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S7-300 PLC Spare / Replacement MMC: For CPU program backup, cloning, or replacing a failed/damaged card.
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Program Distribution: Pre-load project + HW config on MMC at OEM shop, ship to site for plug-and-run commissioning.
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Recipe & Data Log Storage: Store HMI recipes or archived process data on the card for later retrieval.
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Firmware Update Carrier: Load S7-300 CPU firmware update file onto MMC and execute update via CPU menu.
S7-300 MMC family sizes: 6ES7952-1KK00 (8 KB mini), -1KH00 (32 KB), -1KL00 (64 KB mini), -1KM00 (128 KB mini), -1AP00 (2 MB), -1AS00 (4 MB), -1AY00 (8 MB), -1AK00 (16 MB), -1AM00 (32 MB), -1KY00 (64 MB — this item). For S7-1200 use S7-1200 MC (6ES7954-...); for S7-1500 use SIMATIC Memory Card (6ES7954-8LF01 etc.).
