diff --git a/flashchips.c b/flashchips.c
index a1ad445..440c230 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -2176,6 +2176,44 @@ const struct flashchip flashchips[] = {
 	},
 
 	{
+		.vendor		= "Adesto",
+		.name		= "AT25SF641",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= ATMEL_ID,
+		.model_id	= ATMEL_AT25SF641,
+		.total_size	= 8192,
+		.page_size	= 256,
+		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_OTP,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_rdid,
+		.probe_timing	= TIMING_ZERO,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 8192 / 4} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 8192 / 32} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {64 * 1024, 8192 / 64} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {8 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {8 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
+		.printlock	= spi_prettyprint_status_register_plain,
+		.unlock		= spi_disable_blockprotect,
+		.write		= spi_chip_write_256,
+		.read		= spi_chip_read,
+		.voltage	= {2700, 3600},
+	},
+
+	{
 		.vendor		= "Atmel",
 		.name		= "AT26DF041",
 		.bustype	= BUS_SPI,
diff --git a/flashchips.h b/flashchips.h
index 62eb9a5..528d5a8 100644
--- a/flashchips.h
+++ b/flashchips.h
@@ -150,6 +150,7 @@
 #define ATMEL_AT25F4096		0x64	/* Needs AT25F_RDID */
 #define ATMEL_AT25FS010		0x6601
 #define ATMEL_AT25FS040		0x6604
+#define ATMEL_AT25SF641		0x3217
 #define ATMEL_AT26DF041		0x4400
 #define ATMEL_AT26DF081		0x4500	/* guessed, no datasheet available */
 #define ATMEL_AT26DF081A	0x4501