AT45DB081D-SU - 8Mbit SPI DataFlash, 66MHz, 2.7-3.6V | Renesas
MPN: AT45DB081D-SU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.88 | $28.80 |
| 100 | $2.55 | $255.00 |
| 500 | $2.3 | $1,150.00 |
| 1,000 | $2.05 | $2,050.00 |
AT45DB081D-SU Overview
A DataFlash is a serial NOR flash architecture optimized for high-density byte-level storage with built-in SRAM buffers and page-oriented programming. Compared with parallel NOR flash, DataFlash drastically reduces pin count (typically 8 pins versus 28-48), simplifies PCB layout, and lowers system cost. DataFlash sits within the broader hierarchy of non-volatile memory: serial flash > NOR flash > flash memory > non-volatile semiconductor memory. Its two-buffer architecture allows simultaneous read-while-write, enabling efficient logging in data-acquisition and firmware-update workflows.
Key features of the AT45DB081D-SU include 4,096 page-erase sectors, single-cycle reprogram (erase + program) per page, a hardware page-size configuration lock via the binary page-size bit, deep power-down mode reducing ICC to a few microamps, and JEDEC-standard manufacturer/device ID read commands. The device supports 100,000 erase/write cycles per page minimum and a 20-year data retention guarantee.
The AT45DB081D-SU uses a 264-byte SRAM buffer plus a second 264-byte buffer to enable read-while-write. Each main-memory page transfers to a buffer in 80 microseconds (typical). The RapidS SPI engine supports Mode 0 and Mode 3, allowing interoperability with most microcontrollers and DSPs without external logic.
Typical applications include digital audio storage, firmware shadowing in set-top boxes and printers, data logging for industrial sensors, EFR32/SAMD MCU external program memory, and GPS/navigation waypoint storage. The wide 2.7-3.6V supply range supports both 3.3V and battery-backed 3V designs.
When designing with the AT45DB081D-SU, place a 0.1 microfarad decoupling capacitor adjacent to the VCC pin and keep SPI traces short to avoid ringing above 66 MHz. Confirm that your host controller supports mode-0 SPI with a clock divider that does not exceed 66 MHz; many 8-bit MCUs require peripheral clock prescalers below 1:1.
This page synthesizes distributor pricing, drop-in same-package alternatives, and PCB/design guidance not found in the manufacturer datasheet. Compared with bare Octopart/DigiKey listings, this view includes same-package alternatives that share the SOIC-8 (EIAJ) footprint and explains parametric deltas.
Drop-in alternatives for AT45DB081D-SU — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AT45DB081D-SSU
✅ Drop-In📋 Reference alternative (not in catalog)
AT45DB081E-SHN-T
✅ Drop-In📋 Reference alternative (not in catalog)
AT45DB081E-SHN-B
✅ Drop-In📋 Reference alternative (not in catalog)
AT45DB081D-SU-2.5
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
W25Q64JVSSIQ
✅ Drop-In📋 Reference alternative (not in catalog)
AT45DB081D-SU Maximum Ratings & Electrical Characteristics
| Memory Type | Non-Volatile, NOR Flash (DataFlash) |
| Memory Size | 8 Mbit (1 MB / 1,048,576 bytes) |
| Memory Organization | 4,096 pages x 256 bytes (or 4,096 pages x 264 bytes in binary mode) |
| Interface Type | SPI (RapidS serial interface), Modes 0 and 3 |
| Maximum Clock Frequency | 66 MHz |
| Supply Voltage (VCC) | 2.7 V to 3.6 V |
| Page Program Time (typical) | 7 ms (page program via buffer) |
| Endurance | 100,000 erase/write cycles per page (minimum) |
| Data Retention | 20 years (minimum) |
| Package | 8-pin SOIC (EIAJ), 208 mil body width |
| Operating Temperature Range | -40 C to +85 C (industrial) |
| Mounting Type | Surface Mount (SMD/SMT) |
| Lead-Free / RoHS Status | Lead-Free / RoHS Compliant |
AT45DB081D-SU Pin Configuration
| Pin 1 | SI — Serial Data Input (SPI MOSI) |
| Pin 2 | SO — Serial Data Output (SPI MISO) |
| Pin 3 | WP# — Write Protect (active low; internal pull-up) |
| Pin 4 | GND — Ground reference |
| Pin 5 | RESET# — Chip Reset (active low; internal pull-up) |
| Pin 6 | CS# — Chip Select (active low) |
| Pin 7 | SCK — Serial Clock Input (up to 66 MHz) |
| Pin 8 | VCC — Power Supply, 2.7 V to 3.6 V |
Typical Applications
AT45DB081D-SU is suitable for 6 applications: Digital Audio Storage & Playback, Firmware Shadowing for Set-Top Box / Printer, Industrial Data Logging, GPS / Navigation Waypoint Storage, External Program Memory for SAMD / EFR32 MCUs, Smart-Meter and Energy-Logger Memory.
Digital Audio Storage & Playback
The AT45DB081D-SU is well suited to digital audio sample storage in MP3 players, voice recorders, and alert-tone playback modules. Its 8 Mbit density holds approximately 60 seconds of uncompressed 16-bit/22 kHz audio or several minutes of compressed ADPCM content, while the dual 264-byte SRAM buffers enable seamless read-while-write streaming without host-side buffering. The 66 MHz RapidS SPI clock delivers sustained throughput above 8 MB/s, sufficient for stereo 16-bit/44.1 kHz streams, and the 2.7-3.6 V supply aligns with single-cell Li-ion or 3.3 V regulated rails.
Recommended
Firmware Shadowing for Set-Top Box / Printer
The AT45DB081D-SU is widely used as an external firmware shadow store, holding a backup image of the main MCU's program flash for in-field updates and factory recovery. Its 1 MB capacity comfortably fits compressed firmware for mid-range embedded controllers, and the page-oriented 256-byte programming model maps cleanly to OTA update blocks. The single-cycle reprogram operation completes page erasure plus programming in about 7 ms, while the deep power-down mode reduces quiescent current during standby. SPI mode 0 and mode 3 support lets the design pair with virtually any 3.3 V MCU without glue logic.
Recommended
Industrial Data Logging
Industrial sensor hubs use the AT45DB081D-SU to log vibration, temperature, and pressure samples from machine-condition monitoring systems. The 100,000-cycle per-page endurance and 20-year retention cover typical service-life logging requirements, while the dual buffers allow continuous write of new telemetry without blocking host reads of historical pages. The 8-pin SOIC footprint simplifies through-hole-to-SMD retrofits in legacy industrial enclosures, and the wide -40 C to +85 C operating range supports factory-floor and outdoor cabinet deployments.
Recommended
GPS / Navigation Waypoint Storage
Handheld GPS receivers and marine chartplotters use the AT45DB081D-SU to store waypoints, tracks, and base-map tiles because the 1 MB density holds thousands of records and the 66 MHz SPI bus accommodates fast chart-paging during zoom and pan. The 2.7-3.6 V supply integrates directly with battery-backed 3.3 V rails in portable GPS designs, and the SOIC-8 footprint simplifies hand-solder repairs for field service. Hardware write-protect (WP#) and reset (RESET#) pins give the designer clean safeguards against accidental map corruption.
Recommended
External Program Memory for SAMD / EFR32 MCUs
Microchip SAMD21/SAME54 and Silicon Labs EFR32 MCUs with limited internal flash use the AT45DB081D-SU as external execute-in-place (XIP) memory via their QSPI/SPI peripheral. The RapidS 66 MHz interface delivers low-latency instruction fetches in tinyLoRa and BLE sensor nodes, while the dual buffer architecture simplifies memory-mapped read operations. The 8-SOIC EIAJ package fits small sensor-module PCBs and the 2.7 V minimum supply matches coin-cell boost outputs. Designers should enable the MCU's QSPI cache to mask the DataFlash access latency.
Recommended
Smart-Meter and Energy-Logger Memory
Single-phase smart meters and solar inverters use the AT45DB081D-SU to store tamper-proof load-profile logs and tariff tables that must survive power-loss events. The 100,000-cycle endurance comfortably handles 15-minute interval logging over the meter's 20-year service life, and the page-erase architecture simplifies rolling-buffer firmware. Hardware RESET# allows the host MCU to recover from SPI bus-lock conditions, while the SOIC-8 EIAJ footprint survives the high-temperature IR-reflow profile used in metering production lines.
Recommended
Recommended Products Summary
Engineering reference data for AT45DB081D-SU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AT45DB081D-SSU | AT45DB081E-SHN-T | AT45DB081E-SHN-B | W25Q64JVSSIQ |
|---|---|---|---|---|---|
| Brand | Renesas Electronics (formerly Atmel/Adesto/Dialog) | Renesas Electronics | Renesas Electronics | Renesas Electronics | Winbond |
| Package | 8-SOIC (EIAJ, 208 mil) | 8-SOIC (EIAJ, 208 mil) - same | 8-SOIC (EIAJ, 208 mil) - same | 8-SOIC (EIAJ, 208 mil) - same | 8-SOIC (208 mil) - same |
| Memory Density | 8 Mbit (1 MB) | 8 Mbit (1 MB) | 8 Mbit (1 MB) | 8 Mbit (1 MB) | 64 Mbit (8 MB) |
| Interface | RapidS SPI (Modes 0 & 3) | RapidS SPI (Modes 0 & 3) | RapidS SPI (Modes 0 & 3) | RapidS SPI (Modes 0 & 3) | Standard SPI / Dual SPI / Quad SPI (JEDEC) |
| Max Clock Frequency | 66 MHz | 66 MHz | 85 MHz | 85 MHz | 133 MHz |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 2.7 V to 3.6 V |
| Architecture | DataFlash (dual SRAM buffer, page-oriented) | DataFlash (dual SRAM buffer, page-oriented) | DataFlash (dual SRAM buffer, page-oriented) | DataFlash (dual SRAM buffer, page-oriented) | Standard SPI NOR (sector-erase) |
| Command Set | Atmel/Renesas DataFlash opcode table | Atmel/Renesas DataFlash | Adesto/Renesas DataFlash (refined status reg) | Adesto/Renesas DataFlash (refined status reg) | JEDEC 0x9F ID, 03h/0Bh read |
| Endurance (cycles/page) | 100,000 | 100,000 | 100,000 | 100,000 | 100,000 |
Key Differentiators
- Tube carrier format optimized for prototype and small-batch production (vs AT45DB081D-SSU)
- Proven DataFlash architecture with dual SRAM buffers for read-while-write (vs W25Q64JVSSIQ)
- Renesas-supported legacy part with active inventory at major distributors (vs AT45DB081E-SHN-T)
Design Notes
Place a 0.1 microfarad X7R decoupling capacitor within 3 mm of the AT45DB081D-SU VCC pin, plus a 10 microfarad bulk capacitor on the same supply rail. Keep SPI traces (SCK, SI, SO, CS#) matched within 5 mm to avoid timing skew above 33 MHz; for 66 MHz operation, route over an unbroken ground plane and add 22-33 ohm series resistors near the host MCU to dampen ringing. Avoid routing SPI signals parallel to switching power or motor traces to prevent coupled noise on the DataFlash inputs.
Do not exceed the 66 MHz RapidS SPI clock frequency, and verify that the host MCU's peripheral clock divider can produce a clean frequency below this limit. Many 8-bit microcontrollers derive SPI clocks from the system clock and cannot divide finely enough to land between 50-66 MHz without overrun. Always toggle CS# high between command sequences - the DataFlash opcode engine will lock up if CS# stays low across unrelated SPI traffic. Pull RESET# high through the internal 100 kohm resistor if unused; do not leave RESET# floating in noisy industrial environments.
Keep the WP# and RESET# traces shorter than 25 mm; long traces to these pins can pick up crosstalk from neighbouring switching signals and trigger inadvertent write-protect or reset events. For battery-backed designs, connect VCC to a hold-up rail fed through a Schottky diode so that the DataFlash completes its internal write cycle during a power loss; an in-progress program interrupted below 2.7 V can corrupt a page. Add a 100 kohm pull-up on CS# to keep the device deselected during MCU reset and avoid bus contention on the SO line.
Compliance Information
Lead-free / RoHS compliant per distributor listings. AEC-Q100 not applicable - this is a commercial/industrial-grade memory, not automotive-qualified. Halogen-free status not explicitly stated in the verified data.
