25AA1024T-I/SM - 1Mbit SPI EEPROM 1.8V SOIJ-8 | Microchip
N.º de pieza: 25AA1024T-I/SM ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.1 | $3,10 |
| 10 | $2.78 | $27,80 |
| 100 | $2.45 | $245,00 |
| 500 | $2.18 | $1.090,00 |
| 1.000 | $1.92 | $1.920,00 |
25AA1024T-I/SM Descripción general
A serial EEPROM is a type of non-volatile memory that retains stored data without power and communicates serially over a few wires rather than a parallel bus. EEPROMs occupy the memory hierarchy tier between battery-backed SRAM and Flash: they offer byte-level write granularity (unlike Flash which typically requires page/sector erases), unlimited read cycles, and write endurance of up to 1 million cycles per byte. They are commonly used as parameter, configuration, calibration, and event-log storage in embedded systems.
Key features of the 25AA1024T-I/SM include a 256-byte page write buffer for efficient sequential writes, hardware write-protect (WP), hold pin for pausing serial communication mid-transaction, software write-protection for the upper quarter of memory, and built-in power-on reset (POR) plus write enable latch (WEL). It also supports page, sector (64 KB) and chip erase commands borrowed from Flash for fast bulk clearing, although these are not required for normal byte/page writes.
Internally, the device uses a CMOS EEPROM array with a charge-pump write circuit and an SPI mode 0 and mode 3 compatible interface. Page write time is up to 5 ms with full status polling via the WIP/WEL bits in the STATUS register. Compared to MRAM or FRAM, the 25AA1024 trades write speed for the lowest cost-per-bit and widest ecosystem support in non-volatile storage.
Typical applications include storing user preferences and calibration constants in consumer electronics, asset tracking records in industrial nodes, firmware revision tags in medical devices, and data logging in automotive subsystems. It is well suited to systems that need reliable, low-power, byte-writeable non-volatile storage accessible from a microcontroller via SPI.
When designing with this part, place a 100 nF decoupling capacitor close to VCC, keep SPI traces short, and tie CS, WP and HOLD high through a pull-up resistor when unused to prevent unintended writes. Note that byte writes take up to 5 ms - factor this into your real-time write budget.
This page synthesizes verified distributor pricing, drop-in alternatives, and practical design notes for the 25AA1024T-I/SM beyond what is shown in the manufacturer datasheet.
Alternativas directas para 25AA1024T-I/SM — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con 25AA1024T-I/SM (mismo factor de forma y huella) — difiere en Data Retention, Endurance, Interface, Memory Size, Memory Type.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
25LC1024T-I/SM
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
25AA1024T-E/SM
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
25AA1024-I/SM
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
25AA512T-I/SM
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
25AA1024T-I/MF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
25AA1024T-I/SM Valores máximos y características eléctricas
| Tipo de memoria | Non-Volatile EEPROM (Serial) |
| Tamaño de memoria | 1 Mbit (1024 Kbit) |
| Memory Organization | 128K x 8 |
| Interfaz | SPI (Mode 0 and Mode 3) |
| Frecuencia de reloj máxima | 20 MHz |
| Supply Voltage (VCC) | 1.8 V to 5.5 V |
| Rango de temperatura de funcionamiento | -40C to +85C (Industrial) |
| Page Size | 256 bytes |
| Endurance | 1,000,000 write cycles per byte (typical) |
| Data Retention | >200 years |
| Encapsulado | 8-pin SOIJ |
| Tipo de montaje | Surface Mount |
| Packaging Form | Tape & Reel (T suffix) |
| Write Protection | Hardware WP pin + software quarter-array protect |
| Special Features | Hold pin, POR, WEL, page/sector/chip erase commands |
| Estado RoHS | Compliant |
Configuración de pines de 25AA1024T-I/SM
| Pin 1 | CS — Chip Select input, active low |
| Pin 2 | SO — Serial Data Output (MISO) |
| Pin 3 | WP — Write Protect, active high |
| Pin 4 | VSS — Ground |
| Pin 5 | SI — Serial Data Input (MOSI) |
| Pin 6 | SCK — Serial Clock |
| Pin 7 | HOLD — Hold input, pauses serial communication active low |
| Pin 8 | VCC — Power supply (1.8 V to 5.5 V) |
Aplicaciones típicas
25AA1024T-I/SM es adecuado para 7 aplicacións: Industrial Sensor Calibration Storage, Consumer Device Settings and Preferences, Medical Device Event and Audit Log, Automotive Subsystem Parameter Storage, Networking and IoT Module Identity Storage, Test and Measurement Data Log Buffers, Display and Lighting Configuration Storage.
Industrial Sensor Calibration Storage
Stores factory calibration constants, sensor trim values, and unit-identity records in industrial sensor nodes. The 25AA1024T-I/SM's 128K x 8 organization accommodates detailed per-channel calibration tables plus user-serviceable calibration history. Operating from 1.8 V to 5.5 V lets the same BOM serve 3.3 V MCU-based and 5 V PLC-based systems; the industrial -40C to +85C window matches process-control cabinet environments. The 1 million-cycle endurance supports frequent in-the-field re-calibration, and the 256-byte page write is fast enough to log a full calibration event in a single SPI transaction.
Recomendado
Consumer Device Settings and Preferences
Persists user preferences, language, last-mode, and network credentials in consumer appliances such as coffee machines, AV receivers, and white goods. The 1 Mbit capacity stores multilingual prompt tables and MAC address plus pairing tokens without external Flash. The 1.8 V lower rail enables single-cell Li-ion or 2x AA battery powered designs. Standby current below 1 uA is critical for battery-backed settings retention, and SPI Mode 0/3 compatibility matches essentially all Cortex-M and AVR controllers used in this segment.
Recomendado
Medical Device Event and Audit Log
Captures immutable audit records of device usage, dose events, or session timestamps in medical instruments, with the 25AA1024T-I/SM acting as a tamper-evident event buffer before offload. The wide -40C to +85C range covers clinical and laboratory environments, and the >200 year data retention ensures long-term forensic traceability. Hardware write-protect (WP) prevents firmware from re-writing critical audit records, while software quarter-array protect reserves the upper 256 Kbit for compliance logs. SPI access lets a co-processor or host MCU append records without bus contention.
Recomendado
Automotive Subsystem Parameter Storage
Provides non-volatile parameter and feature-flag storage for body, HMI, and aftermarket automotive ECUs. Although the 25AA1024T-I/SM itself is not AEC-Q100 qualified, the -40C to +85C industrial rating fits cabin and under-hood-near modules; for AEC-Q100 systems Microchip offers the 25AA1024T-E/SM extended-temperature variant in the same SOIJ-8 footprint. The 1 Mbit density accommodates CAN node configuration tables, mileage counters and seat-position memory. SPI Mode 0/3 bus compatibility aligns with all common automotive microcontrollers.
Recomendado
Networking and IoT Module Identity Storage
Stores MAC address, security keys, device certificates, and provisioning data in Wi-Fi, Bluetooth, and sub-GHz IoT modules. The 25AA1024T-I/SM's 1 Mbit capacity fits full X.509 device certificates plus OEM data, removing the need for a dedicated secure element in cost-sensitive designs. SPI bus up to 20 MHz lets a Cortex-M4 host fetch and verify certificates with negligible latency. Low standby current and 1.8 V operation let the module stay in deep-sleep with credentials intact over months on battery.
Recomendado
Test and Measurement Data Log Buffers
Buffers measurement records and instrument-state between offload cycles in handheld DMMs, oscilloscope probes, and process calibrators. The 25AA1024T-I/SM offers 1 Mbit for tens of thousands of samples, with each 256-byte page supporting efficient batch writes when logging bursts. The wide 1.8 V to 5.5 V supply matches lithium primary cells and USB-powered instruments. The >200 year retention protects logged data even when instruments sit idle in storage, and the hardware WP prevents accidental erasure during instrument power-down.
Recomendado
Display and Lighting Configuration Storage
Stores gamma curves, color-calibration profiles, and lighting scene presets for LED drivers and small TFT/LCD displays. The 25AA1024T-I/SM provides 128 Kbytes of room for full 8-bit-per-pixel gamma tables plus per-channel trim values, all accessible via SPI from the same bus as the LED driver ICs. Industrial temperature rating suits both indoor commercial lighting and outdoor signage enclosures. The HOLD pin allows the display host to pause EEPROM access mid-transaction while the LED driver is updated.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para 25AA1024T-I/SM — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | 25LC1024T-I/SM | 25AA1024T-E/SM | 25AA1024-I/SM | 25AA512T-I/SM | 25AA1024T-I/MF |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIJ-8 | SOIJ-8 - same | SOIJ-8 - same | SOIJ-8 - same | SOIJ-8 - same | SOIJ-8 - same |
| Memory Size | 1 Mbit (128K x 8) | 1 Mbit (128K x 8) | 1 Mbit (128K x 8) | 1 Mbit (128K x 8) | 512 Kbit (64K x 8) | 1 Mbit (128K x 8) |
| VCC Range | 1.8 V to 5.5 V | 2.5 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Max SPI Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Temperature Range | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Packaging Form | Tape & Reel | Tape & Reel | Tape & Reel | Tube | Tape & Reel | Tape & Reel |
| AEC-Q100 Automotive | Not qualified | Not qualified | Not qualified (extended temp) | Not qualified | Not qualified | Not qualified |
| Approx 1k Price (USD) | 1.92 | 1.85 | 2.10 | 2.00 | 1.65 | 1.92 |
Diferenciadores clave
- Lowest voltage operation in the 1 Mbit SOIJ-8 SPI EEPROM class (frente a 25LC1024T-I/SM)
- Industrial -40C to +85C rating with same pinout (frente a 25AA1024T-E/SM)
- 1 Mbit density doubles the storage of the next-smaller sibling (frente a 25AA512T-I/SM)
Notas de diseño
Place a 100 nF X7R decoupling capacitor within 5 mm of the VCC pin. The SOIJ-8 pad pattern is identical to standard SOIC-8 - existing 25xxx-series PCB footprints are directly reusable. Keep the CS trace short and route it on an outer layer to minimize capacitive coupling to SCK. For high-noise environments, place a 10 kohm pull-up on CS, WP, and HOLD tied to VCC to prevent spurious writes during MCU reset.
Do not exceed 5.5 V on VCC - the device is not 5 V tolerant in absolute maximum. Always drive CS high after each SPI transaction so the internal state machine can finalize the write. During page writes, do not split the write across two CS low pulses - the internal buffer is cleared when CS goes high, and you will lose the unwritten bytes. Wait at least 5 ms (or poll WIP in the STATUS register) before initiating another write.
The SPI bus can run up to 20 MHz but only if traces are short (under 50 mm) and the bus is not loaded by many secondaries. For bus lengths beyond 100 mm, lower SCK to 10 MHz or add a 33 ohm series resistor near the master to dampen reflections. The HOLD pin allows the master to pause an in-flight read or write without deselecting the chip - useful when an interrupt preempts the SPI transfer.
Read current is typically 5 mA at 20 MHz and standby current is below 1 uA per the Microchip datasheet. The part is rated to operate from 1.8 V to 5.5 V - this is wider than the 2.5 V lower limit of the 25LC1024T variant. For battery-backed applications, disable the SPI clock and raise CS high to put the part in standby. There is no dedicated power-down pin; standby is purely SPI-state driven.
Información de cumplimiento
RoHS compliant per Microchip product page. Not AEC-Q100 qualified; for AEC-Q100 designs use the automotive-qualified variants per the latest Microchip cross-reference. Halogen-free status not explicitly listed in the verified web data.
