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Decoding the Mystery: A Guide to 6-Pin SMD IC Marking Codes In modern electronics, surface-mount devices (SMDs) rule the board. Among them, the 6-pin package—often SOT-23-6, TSOP-6, or SC-70-6—is ubiquitous. You’ll find it performing critical roles: dual op-amps, voltage regulators, MOSFET drivers, logic gates, analog switches, and even simple microcontrollers. But there’s a catch. The component’s full part number rarely fits on its tiny body. Instead, you see a cryptic marking code : 2 to 4 alphanumeric characters (e.g., A12 , B7F , 702 , 1P ). This article explains how to interpret those codes and successfully identify your 6-pin SMD IC. Why Marking Codes, Not Part Numbers? A standard IC like the MAX44248 (dual op-amp) or TPS62040 (DC-DC converter) has a name too long for a 3mm x 3mm package. Manufacturers use a short marking code that maps to the full part number, date code, and sometimes lot traceability.
Crucial fact: The marking code is not universal. The same code A12 on one brand’s chip could be a comparator; on another brand, it could be a load switch.
Where to Find the Marking Code On a 6-pin SMD IC:
The top marking is usually 2–4 characters. A pin 1 indicator (dot, notch, or chamfered edge) helps orient the text. Some ICs include a date code (one digit for year, one for month) as part of the marking. 6 pin smd ic marking code
Example marking on a SOT-23-6: B7 F
B7F is the full marking code. The orientation of the text relative to pin 1 matters. Common 6-Pin SMD IC Functions Before you search, know what the IC likely does. 6-pin SMD parts commonly include: | Function | Example Full Part | Common Marking Prefix | | --- | --- | --- | | Dual Op-Amp | LMV358, MAX44248 | A, B, M, L | | Voltage Regulator (LDO) | TPS79330, XC6206 | P, K, 65, 33 | | Analog Switch / Mux | TS5A3159, MAX4544 | S, T, 9 | | MOSFET Driver | MCP1401, FAN3100 | D, V | | Single Gate Logic (AND, OR, Inverter) | 74LVC1G04, NC7SZ08 | 04, 08, 32 | | DC-DC Converter | RT8008, MCP1640 | B, C, L | | Comparator | MAX9030, LMV331 | 30, 33 | How to Decode a 6-Pin SMD Marking Code – Step by Step Let’s say you have a chip marked 1P on a SOT-23-6 board. Step 1: Note the package type SOT-23-6? TSOP-6? SC-70-6? Use calipers if needed. Step 2: Identify the manufacturer (if possible) Look for a tiny logo. Common ones:
Analog Devices – A with a circle or triangle Texas Instruments – TI or a simple dot map Maxim (now ADI) – A small M with a dot Microchip – M with a stylized line NXP – Small oval Onsemi – On, or a dot-letter combo Decoding the Mystery: A Guide to 6-Pin SMD
Step 3: Search the marking code + “6-pin” + package Example searches:
"1P" SOT-23-6 marking code "B7F" 6-pin SMD IC marking code "702" TSOP-6
Step 4: Use dedicated SMD code databases These are invaluable: But there’s a catch
SMD Codebook (Android/iOS app) – Search by code, package, or pins. markingcodes.com – Good for older parts. Datasheet Archive – Search “marking code” along with potential brand. Alldatasheet.com – Use the “Top Mark” search if available.
Step 5: Cross-reference package and pin function If the chip is near a power inductor → DC-DC converter. If near input/output connectors → ESD protection or analog switch. If two identical amps → dual op-amp. Real-World Example Decodes | Marking | Package | Likely Full Part | Function | | --- | --- | --- | --- | | A12 | SOT-23-6 | LMV321IDBVR (TI) | Single op-amp (yes, 5-pin, but marking often reused) | | 702 | SOT-23-6 | TPS70202PWP (TI) | Dual LDO regulator | | B7F | SOT-23-6 | MAX40200 (Maxim) | Ideal diode controller | | 1P | SOT-23-6 | MIC5205-3.3YM5 (Microchip) | 3.3V LDO regulator | | K72 | TSOP-6 | MCP6S21 (Microchip) | Programmable gain amp |