Product Name:PHILIP M3535A/M3536A Defibrillator SD Card PN 989803146981

OEM Part Number: 989803146981 (often listed as HC989803146981)

Capacity: 256 MB (SDSC standard, FAT16/FAT32 as formatted by MRx)

Card Form Factor: Standard SD (not microSD, not CompactFlash — note: early MRx brochures reference a “CompactFlash data card”; the 989803146981 256 MB item is the SD variant used in later M3535A/M3536A builds and service kits)

Compatible Devices: PHILIP MRx Monitor/Defibrillator — M3535A, M3536A (and service-equivalent MRx main units); inserted into the device’s removable data-card slot for patient case offload

Primary Function: Stores continuous ECG waveforms + event logs + 12-lead reports + config/status logs for physical transfer to PC (Event Review software) or between units; does not replace internal RAM (internal memory holds 12 h waveform + ~55 event summaries per MRx spec)

Typical Stored Yield (256 MB): Roughly 60 event summary reports OR ~240 MB of raw patient waveform/event data per PHILIP MRx data-card sizing guidance (internal memory equivalent is 12 h waveform + 50–55 12-lead reports; card is for offload/archival)

Interface: SDIO / SPI as implemented in MRx firmware; read/write only via MRx or PC SD reader (MRx does not support arbitrary consumer SD cards — only PHILIP-qualified/refurbished 989803146981 or service-replacement cards are validated)

Write Endurance: Medical-grade SLC/MLC per PHILIP qualification (not a retail card); rated for repeated shift-level writes (typical field life several hundred write/erase cycles under EMS use)

Environment: Operating 0–45 °C (matches MRx); storage −20–70 °C; humidity 0–95% non-condensing

ESD/Safety: Handled as static-sensitive medical accessory; not patient-contact

Sterility: Non-sterile

Notes:

• REF 989803146981 is the PHILIP-original 256 MB SD card; third-party listings sometimes sell “256MB SD card for MRx 989803146981” but only PHILIP-formatted/qualified cards guarantee MRx recognition.

• If your MRx has an older CompactFlash bay instead of SD, this part is NOT mechanically compatible — that bay uses a different PHILIP CF data card SKU.

• When replacing: format/initialize in the MRx (“Data Card Utilities”) before clinical use; do not pre-load with PC files.