jielie

Chip markings explained

It is well-known that JieLi’s chips mostly have completely nonsense/misleading markings, which does not tell the chip’s name right away, at least at the first glance.

Sometimes the actual name is presnt on the chip, however this is the case either on early chips (like 2011 era AC2092), or on some recent chips too. (JL700N, JL697N, etc.)

But most of the time the chip’s name is hidden into the chip’s serial number, in the part that goes after a dash. However sometimes even this might be absent, for example on AC209N/AC309N chips or the AC690N master chip.

In this case, to determine the actual chip name you need to consider a bunch of factors, namely:

• Application: bluetooth speaker, MP3 player, dash cam, microscope, etc.
• Package: e.g. in AC69xx the ‘AC69x5’ chips come in a SSOP24 package, the ‘AC69x6’ chips come in QFN32, and the ‘AC69x1’ come in LQFP48.
• Design date: usually a recent design won’t use some ancient chip series in favour of the recent ones
• Chip’s internal details: e.g. AC690N and AC691N series are marked the same way, but they’re still different: BR17 and BR20. AC540N and AC560N are both DV16 but they differ by the SDRAM type used: former uses DDR2 but the latter uses DDR1 instead.

Marking explaination

Let’s look at some chip markings and break them apart to understand the parts that make up the marking:

Marking	A	B	C	D	E	f	g	h	Actual name
AB1526CG3X1F.1-82E	AB	15	26		CG3X1F.1	82	E		AC1082E
AB1819CK1Y11.1-87	AB	18	19		CK1Y11.1	87			AC1187
AC1135D22731	AC	11	35		D22731				AC2092 (indeed!)
AB225H77028	AB	2	25		H77028				ACx09N
AC1245H7A935	AC	12	45		H7A935				AC2092
AC1536CG4A3C-E	AC	15	36		CG4A3C		E		AC2092E
AC19DH4502-01	AC	19			DH4502	01			AC4601
ADDEF438-01B	AD				DEF438	01	B		AC4601B
AC1631D97294-04A	AC	16	31		D97294	04	A		AC5204A
AC19AP22917-1A4	AC	19		A	P22917	1	A	4	AC5x01A
AC21BP0A908	AC	21		B	P0A908				AC690N
AC20AP2J262-1A8	AC	20		A	P2J262	1	A	8	AC6901A
AS1707AP0Y11Q-5A8	AS	17	07	A	P0Y11Q	5	A	8	AC6905A
AS18AP16368-8C4	AS	18		A	P16368	8	C	4	AC6908C
AC1835E8P348-9A4	AC	18	35		E8P348	9	A	4	AC6909A
AC19AP26102-25E4	AC	19		A	P26102	25	E	4	AC6925E
BP09766-26A4				B	P09766	26	A	4	AC6926A
EA9395-26LC					EA9395	26	L	C	AC6926L
AC20BP05193-65A4	AC	20		B	P05193	65	A	4	AC6965A

The parts in uppercase (ABCDE) is the ‘serial number’, while the parts in lowercase (fgh) is the ‘part number’, which comes after a dash.

Serial number

• A: Letters ‘AB’, ‘AC’, ‘AD’, ‘AS’, ..
  • The first letter is always ‘A’
  • May be omitted
• B: Manufacturing year
  • Usually it represent the last two digits of the year, e.g. ‘18’ is year 2018, but sometimes it’s truncated even further: ‘2’ means 2012 (probably)
  • May be omitted
• C: Manufacturing week
  • Usually omitted on newer chips, but sometimes it might present.
  • Never present without the year code
• D: Letters ‘A’, ‘B’, ..
  • probably that’s a part of the lot number
• E: Lot number
  • Sometimes it can be used to distinguish between e.g. AC109N and AC608N: the former has the ‘.1’ suffix, the latter lacks it.

In some cases, some parts of the serial number may be omitted to fit into tiny packages like QFN32 (in that case only the lot number is present).

Part number

• f: Chip series variant (i.e. AC6901, AC6902, AC6965)
• g: Chip variant letter (A, B, C, D, etc.)
• h: Additional information (e.g. flash size, sdram size, psram size..)
  • Flash size is expressed in megabits (e.g. 8 means 8 Mb = 1 MB)
  • Chips without any flash put ‘0’ here (e.g. AC691N without flash) or what’s more relevant to them (e.g. SDRAM size)

This also applies to the full chip marking too, with the first part now being the actual chip name (JL6976, JL700N, etc.)

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Some chip lists

Chip marking	Actual name	Some details	Source
AB225H77028	AC309N??	year 2012
AC1520CFA813.1-82E	AC1082	year 2015
AB1526CG3X1F.1-82E	AC1082	year 2015	myself
AC1626CG9278.1-82E	AC1082	year 2016
AB1828CH2G0Q.1-82E	AC1082	year 2018
AD1431CF5243.1-83EM	AC1083	year 2014
AB1819CK1Y11.1-87	AC1187	year 2018	myself
AC2092 AC1135D22731	AC2092	year 2011	radioskot
AC1245H7A935	AC2092	year 2012	radioskot
AC1536CG4A3C-E	AC2092E	year 2015	radioskot
ADDEF438-01B	AC4601B	- I guess
AC19DH4502-01	AC4601	year 2019	esp8266
AC1631D97294-04A	AC5204A	year 2016	myself
AC19AP22917-1A4	AC5x01A	year 2019, 4 = ??
AC21BP0A908	AC690	year 2021
AC20AP2J262-1A8	AC6901A	year 2020, 8 Mbit flash
AS1707AP0Y11Q-5A8	AC6905A	year 2017, 8 Mbit flash
AS21BP0A909-5A8	AC6905A	year 2021, 8 Mbit flash
AS18AP16368-8C4	AC6908C	year 2018, 4 Mbit flash	myself
AC1835E8P348-9A4	AC6909A	year 2018	EEVblog #1330
AC19AP1S079-25A4	AC6925A	year 2019, 4 Mbit flash
AC20BP09548-25A4	AC6925A	year 2020, 4 Mbit flash
AS20BP03306-25C4	AC6925C	year 2020, 4 Mbit flash
AC21BP0A221-25C4	AC6925C	year 2021, 4 Mbit flash
AC19AP26102-25E4	AC6925E	year 2019, 4 Mbit flash	myself
BP09766-26A4	AC6926A	4 Mbit flash
EA9395-26LC	AC6926L	…
AS19AP29069-25F4	AC6925F	year 2019, 4 Mbit flash
AS21BP03721-55F4	AC6955F	year 2021, 4 Mbit flash
AC20BP05193-65A4	AC6965A	year 2020, 4 Mbit flash	myself
AS21BP0B847-65A4	AC6965A	year 2021, 4 Mbit flash
BP15698TKE JL6976M4	JL6976M		Julian Ilett