25LC512T-E/SN - 512Kbit SPI EEPROM, 20 MHz, 8-SOIC | Microchip
N.º da peça: 25LC512T-E/SN ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.95 | $2,95 |
| 10 | $2.66 | $26,60 |
| 100 | $2.37 | $237,00 |
| 500 | $2.13 | $1.065,00 |
| 1.000 | $1.95 | $1.950,00 |
| 3.000 | $1.78 | $5.340,00 |
25LC512T-E/SN Visão geral
What is a Serial EEPROM? A Serial EEPROM is a type of non-volatile memory (NVM) that retains stored data when power is removed and communicates serially over a few wires (SPI, I2C, or Microwire) rather than with a wide parallel bus. In the memory hierarchy, EEPROMs sit below Flash for density but offer finer write granularity (single-byte writes), much higher write endurance (typically 1M cycles), and lower power consumption. The 25LC512 belongs to the SPI EEPROM sub-family, providing a middle ground between tiny I2C EEPROMs and larger parallel Flash, ideal for storing configuration parameters, calibration constants, and user preferences.
Key features include 512 Kbit of user-accessible memory organized as 64K x 8, a 20 MHz maximum SPI clock supporting Mode 0 and Mode 3, a 5 ms maximum page write cycle time, hardware and software write protection, and a built-in power-on/power-down protection circuit. The wide 2.5 V to 5.5 V VCC range allows direct interfacing with 3.3 V and 5 V microcontrollers without level shifters, and the SOIC-8 footprint is JEDEC-standard, enabling drop-in compatibility with most competitor SPI EEPROMs.
The 25LC512 uses a CMOS process with on-chip high-voltage generation for the floating-gate cells, eliminating the need for an external VPP supply. Its 128-byte page write buffer, automatic erase-before-write within the page, and STATUS register polling (via the WIP bit) simplify firmware drivers. Power-down protection circuitry prevents inadvertent writes during supply transitions, a critical feature for industrial systems with hot-plug or brown-out scenarios.
Typical applications include consumer electronics for storing user preferences and language strings, industrial automation modules holding calibration data and serial numbers, medical devices logging patient/device identifiers, automotive accessory nodes (non-safety subsystems), networking equipment for MAC address and configuration backup, and IoT edge devices retaining sleep-state parameters through battery swaps.
When designing with the 25LC512, place a 0.1 uF decoupling capacitor within 5 mm of the VCC pin and keep SPI traces short to avoid ringing on MISO/MOSI/SCK. For multi-master SPI buses, ensure the CS signal is properly managed; for write endurance concerns, implement wear-level wear-leveling by rotating writes across the page boundaries when storing frequently updated data such as event counters.
This page synthesizes Microchip datasheet parameters, current distributor pricing, real-time stock state, drop-in alternative MPNs from same-brand and cross-brand vendors, and practical PCB/firmware design guidance not consolidated in a single vendor document.
Alternativas drop-in para 25LC512T-E/SN — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com 25LC512T-E/SN (mesmo formato e footprint) — diferindo em Data Retention, Interface, Memory Type, Memory Size, Page Size.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
25LC512-I/SN
✅ Drop-In✓ Em estoque
$1.36 / unidade
Ver ficha técnica →25LC512-E/SN
✅ Drop-In✓ Em estoque
$0.86 / unidade
Ver ficha técnica →25LC512T-I/SN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
25LC512-E/MF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
25AA512-I/SN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
M95512-RMN6TP
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AT25656B-SSHL-T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
25LC512T-E/SN
✅ Drop-In✓ Em estoque
$1.78 / unidade
Ver ficha técnica →25LC512T-E/SN Especificações
| Tipo de memória | Serial EEPROM (Non-Volatile) |
| Tamanho da memória | 512 Kbit (64K x 8) |
| Memory Organization | 64K x 8 |
| Interface | SPI (Serial Peripheral Interface) - Mode 0 and Mode 3 |
| Frequência máxima de clock | 20 MHz |
| Supply Voltage (VCC) | 2.5 V to 5.5 V |
| Faixa de temperatura de operação | -40C to +125C (E - Extended) |
| Page Size | 128 bytes |
| Maximum Page Write Cycle Time | 5 ms |
| Write Endurance | 1,000,000 erase/write cycles per page (typical, per datasheet) |
| Data Retention | > 200 years (typical, per datasheet) |
| Encapsulamento / Caixa | 8-SOIC (0.154" / 3.90 mm body width, JEDEC SO-8 SN variant, tape & reel) |
| Tipo de montagem | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Special Features | Hardware WP, Hold pin, Page/Sector/Chip erase, Write Enable Latch, Power-on/Power-down protection |
Configuração de pinos do 25LC512T-E/SN
| Pino 1 | CS — Chip Select input (active low) - selects the device on the SPI bus |
| Pino 2 | SO — Serial Output (MISO) - data shifted out of the device during read operations |
| Pino 3 | WP — Write Protect input (active low) - when LOW, prevents writes to the STATUS register and array |
| Pino 4 | VSS — Ground reference for VCC and logic signals |
| Pino 5 | SI — Serial Input (MOSI) - data shifted into the device during write operations |
| Pino 6 | SCK — Serial Clock input from SPI master (up to 20 MHz) |
| Pino 7 | HOLD — Hold input (active low) - pauses serial communication without deselecting the device |
| Pino 8 | VCC — Power supply input (2.5 V to 5.5 V) |
Aplicações típicas
25LC512T-E/SN é adequado para 7 aplicaçãos: Industrial Configuration Storage, Consumer Electronics User Preferences, Automotive Accessory Modules, Medical Device Parameter Memory, IoT Edge Node Sleep-State Persistence, Networking Equipment MAC & Config Backup, Audio Equipment Calibration & Preset Storage.
Industrial Configuration Storage
The 25LC512T-E/SN is well suited to industrial configuration storage, providing 512 Kbit (64 KB) of non-volatile memory for device parameters, calibration coefficients, and serial numbers in PLCs, motor controllers, and HMI panels. Its 2.5 V to 5.5 V VCC range lets it sit on either 3.3 V or 5 V system rails, and the 20 MHz SPI throughput lets an ARM Cortex-M0/M4 host load the full memory array in roughly 26 ms, well within typical boot time budgets. The Extended -40C to +125C operating range covers outdoor and cabinet-mounted equipment, and the built-in power-on/power-down write protection prevents corruption during brown-out events that are common on factory 24 V busses.
Recomendado
Consumer Electronics User Preferences
In consumer products such as smart thermostats, audio amplifiers, and home appliances, the 25LC512T-E/SN stores user preferences, language strings, last-used settings, and Wi-Fi credentials that must survive power cycles. Its 128-byte page write granularity lets firmware update individual preference blocks without rewriting the full 64 KB array, and the 5 ms page write time is fast enough for transparent background saves. SPI Mode 0 / Mode 3 support and a 20 MHz clock allow seamless interfacing with common Wi-Fi/BLE SoCs such as the ESP32 family, and the SOIC-8 footprint plus 2.5 V to 5.5 V VCC range simplifies BOM sharing across 3.3 V and 5 V product variants.
Recomendado
Automotive Accessory Modules
For non-safety automotive subsystems such as infotainment head units, instrument cluster calibration data, HVAC modules, and aftermarket telematics, the 25LC512T-E/SN provides reliable parameter storage that survives engine-crank voltage drops and cabin temperature swings up to +125C. Although the part is not AEC-Q100 qualified, it is widely used in non-safety automotive accessories where the Extended temperature range and the hardware WP pin deliver sufficient robustness. The 20 MHz SPI clock keeps firmware update paths short, while the HOLD pin lets a host MCU pause an in-progress SPI burst when servicing a higher-priority interrupt - useful for CAN/LIN gateway designs.
Recomendado
Medical Device Parameter Memory
In medical devices such as portable patient monitors, hearing aids, and point-of-care diagnostic equipment, the 25LC512T-E/SN provides low-power non-volatile storage of patient identifiers, device serial numbers, calibration constants, and event logs. Its 1,000,000-cycle endurance per page supports frequent updates such as timestamped event records without wear-out, and 200-year data retention ensures stored records remain intact over multi-year device lifecycles. The Extended -40C to +125C temperature range covers clinical and emergency-response thermal envelopes, and the small SOIC-8 footprint supports the compact form factors typical of wearable and handheld medical devices.
Recomendado
IoT Edge Node Sleep-State Persistence
For battery-powered IoT edge nodes running on coin cells or Li-Ion packs, the 25LC512T-E/SN stores sleep-state context - sensor baselines, sleep counters, last-known network parameters - that must survive deep-sleep power cycles. The 2.5 V to 5.5 V VCC range works directly from a Li-Ion cell (3.0 V to 4.2 V) or a regulated 3.3 V rail, and the 1 uA typical standby current adds negligible drain to the deep-sleep budget. Compared with internal MCU EEPROM emulation in flash, a discrete SPI EEPROM provides cleaner write semantics, byte-level granularity, and a higher write endurance ceiling for telemetry counters in sleep-state scenarios.
Recomendado
Networking Equipment MAC & Config Backup
In routers, switches, and industrial gateways, the 25LC512T-E/SN stores the 6-byte MAC address (EUI-48), the 8-byte EUI-64 identifier, login credentials, IP configuration, and bootloader revision metadata. Its 20 MHz SPI clock lets a GbE switch ASIC read its full configuration during the first 26 ms after POR, well within typical switch initialization windows. Hardware write protection via the WP pin lets the factory lock the MAC block while still permitting user configuration updates elsewhere in the memory map, a common pattern for carrier-grade networking equipment.
Recomendado
Audio Equipment Calibration & Preset Storage
In professional audio amplifiers, digital mixers, and multi-effect processors, the 25LC512T-E/SN stores user presets, EQ curves, channel routing tables, and factory calibration constants. The 64 KB capacity comfortably fits hundreds of preset slots plus system configuration, while the 128-byte page write granularity lets the audio DSP update a single preset without disturbing the rest of the memory map. The SOIC-8 footprint is small enough for high-channel-count rack equipment, and the 2.5 V to 5.5 V VCC range covers both 3.3 V DSP rails and 5 V analog supply domains, simplifying power architecture across mixed-signal audio boards.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para 25LC512T-E/SN — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 25LC512-I/SN | 25LC512-E/SN | 25LC512T-I/SN | M95512-RMN6TP |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | STMicroelectronics |
| Package | 8-SOIC (SN) | 8-SOIC (SN) - same | 8-SOIC (SN) - same | 8-SOIC (SN) - same | 8-SO (SO-8) - same |
| Memory Size | 512 Kbit (64K x 8) | 512 Kbit (64K x 8) | 512 Kbit (64K x 8) | 512 Kbit (64K x 8) | 512 Kbit (64K x 8) |
| Interface | SPI (Mode 0/3) | SPI (Mode 0/3) | SPI (Mode 0/3) | SPI (Mode 0/3) | SPI (Mode 0/3) |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 16 MHz |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Operating Temperature | -40C to +125C (E) | -40C to +85C (I) | -40C to +125C (E) | -40C to +85C (I) | -40C to +125C |
| Page Size | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Packaging Format | Tape & Reel | Tube | Tube | Tape & Reel | Tape & Reel |
Principais diferenciais
- Tape & Reel packaging for high-volume SMT assembly (vs 25LC512-E/SN (Tube packaging))
- Extended -40C to +125C industrial operating range (vs 25LC512T-I/SN (Industrial -40C to +85C))
- Same-brand preference from XAIPART site MPN list (vs M95512-RMN6TP (STMicroelectronics cross-brand))
Notas de projeto
Estimated: at VCC=3.3 V and a 20 MHz SCK continuously toggling with all outputs lightly loaded, the 25LC512 typically draws 5 mA active and 1 uA standby per datasheet DC characteristics. Place a 0.1 uF X7R decoupling capacitor within 5 mm of pin 8 (VCC), with a 10 uF bulk cap on the rail to handle the SPI bus surge currents during block read/write operations. Tie WP (pin 3) to VCC through a 10 kohm pull-up to disable hardware write protection by default; bring it LOW only when a controlled write is desired.
Estimated: route SPI signals (CS, SO, SI, SCK, HOLD) as short, matched-length traces (< 50 mm) directly above a continuous ground plane. Place the SOIC-8 with pin 1 in the upper-left orientation per JEDEC convention; orient the GND pin (pin 4) toward the system ground pour for shortest return paths. Avoid routing SPI traces parallel to noisy switching signals (DC-DC SW nodes, motor phases); cross them at 90 degrees if unavoidable. Keep the WP and HOLD traces short to prevent them from picking up noise that could spuriously disable writes or pause SPI bursts.
Estimated: the most common design pitfalls with the 25LC512 are (1) forgetting to assert CS LOW before the first SCK edge, causing the slave to ignore the entire command, (2) polling the WIP (Write-In-Progress) bit only once instead of looping, missing the 5 ms page-write completion window, and (3) treating the device as I2C-compatible - the 25LC512 is SPI-only and will not respond to 24LCxxx I2C addresses. Always issue the WREN (Write Enable, 0x06) command before each WRITE or WRSR instruction, and verify the WEL bit set in the subsequent read of STATUS register before initiating the write cycle.
Estimated: at 20 MHz SCK the SO (MISO) signal can ring on long traces - add a 22 ohm series resistor close to the 25LC512 SO pin (pin 2) to damp reflections if the trace exceeds 25 mm. If the host MCU runs at 1.8 V logic, level-shifters on MOSI/SCK/CS/HOLD are required because the 25LC512 minimum VIH is 0.7*VCC, which at 3.3 V VCC equals 2.31 V. Confirm WP (pin 3) and HOLD (pin 7) are pulled HIGH through 10 kohm resistors when not actively driven to prevent floating inputs from latching spurious commands.
Informações de conformidade
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - this part is designed for industrial and consumer applications, not automotive safety-critical subsystems. Lead-free and halogen-free per Microchip material declaration. REACH compliant.
