Standard/interesting electronic components

This is a categorized list of standard and interesting electronic components that I’ve found over the years. It’s sorted by component area of use and type.

MOSFETs

Name	Type	Classification	Approximate Rdson (usually @10V Vgs)	Max Vds	Max Vgs	Max continuous current	Max power dissipation	Logic level compatibility	Package	Manufacturer price for qty 1
AO3400	N-channel	Low-power	30mOhm	30V	12V	5A	1W	Yes, 52mOhm@2.5V	SOT-23	~0.03$
AO3401 (complement of AO3400)	P-channel	Low-power	30mOhm	30V	12V	4A	1W	Yes, 85mOhm@2.5V	SOT-23	~0.05$
AO4266E (AO4264 is NRND)	N-channel	Medium-power	14mOhm	60V	20V	11A	2.5W	Yes	SOIC-8	~0.25$
AO4485	P-channel	Medium-power	15mOhm	40V	20V	10A	2.5W	Yes	SOIC-8	~0.2$
AO4402	N-channel	Medium-power	6mOhm	20V	12V	20A	2.5W	Yes, 7mOhm@2.5V	SOIC-8	~0.3$ (official, ~0.1$ clones exist)
AO4614B/BL	Both	Medium-power	~35mOhm N-channel, ~50mOhm P-channel	40V max Vds (both)	20V max Vgs (both)	6A cont. N-channel, 5A cont. P-channel	2.5W (combined)	Yes	SOIC-8	~0.25$
AOD4184	N-channel	High-power	9mOhm	40V	20V	50A	50W	Yes	TO-252	~0.3$
AOD4185 (complement of AOD4184)	P-channel	High-power	15mOhm	40V	20V	40A	50W	Yes	TO-252	~0.3$

Logic MOSFETs:

This category is optimized for logic operations. These MOSFETs are much more vulnerable to ESD and have a much higher resistance, but they are also easier to turn on.

N-channel MOSFET: BSS138

• Most common logic MOSFET by far (SMD version of BS170)
• Vulnerable to ESD
• Can be found extremely cheap by infinitely many second sources

P-channel MOSFET: DMP610

• Most common P-channel logic MOSFET by far
• Can be found extremely cheap by infinitely many second sources

BJTs

Name	Type	Classification	Max Vce	Max collector current	Max power dissipation	Gain/beta	Package	Notes
2N3904	NPN	Low-power	40V	200mA	625mW for TO-92 package, 350mW for SOT-23 package	100@10mA, 30@100mA	TO-92/SOT-23	Most common transistor ever, BC547 is the European version
2N3906	PNP	Low-power	40V	200mA	625mW for TO-92 package, 350mW for SOT-23 package	100@10mA, 30@100mA	TO-92/SOT-23	Complement of 2N3906 (BC557 is almost identical)
TIP41/MJD41	NPN	Medium-power	100V	6A	2W without heatsink, 65W with heatsink	30@300mA, 15@3A	TO-220/TO-252	Very common, many second sources exist
TIP42/MJD42	PNP	Medium-power	100V	6A	2W without heatsink, 65W with heatsink	30@300mA, 15@3A	TO-220/TO-252	Complement of TIP41
TIP120/121/122/125/126/127	Darlington NPN/PNP	Medium-power	60-100V	5A	2W without heatsink, 65W with heatsink	1000 at all currents	TO-220/TO-252	The variants are complementary NPN/PNP with different max Vce
2N3055/TIP3055/MJ3055/MJE3055	NPN	High-power	60V	15A	115W with heatsink	Min. 20@4A, 5@10A	TO-3	If you need this, something has gone terribly wrong
2N2955/TIP2955/MJ2955/MJE2955	PNP	High-power	60V	15A	115W with heatsink	Min. 20@4A, 5@10A	TO-3	Complement of 2N3055 (and variants)

LDOs

All mentioned LDOs can be used with ceramic capacitors. Note that if you need a very high-power LDO for some reason, it’s best to build it with a discrete operational amplifier + transistor. You can find very high-power discrete LDO designs everywhere. The issues with the classic LM317 and 7805 is that they require enormous quiescent currents, are unstable with ceramic capacitors, and have high dropout voltages.

If you need more current than any of these can individually provide, you can use any linear regulator in a Sziklai pair configuration to increase the current. You can read more about it here: Increasing Regulator Current

Part	Vout	Max output current	Max Vin	Dropout Voltage	Ripple Rejection	Quiescent Current
AP2127K-ADJTRG1	Adjustable; 0.8 – 5.5V	400mA	6V	170mV @ 300mA	68dB @ f = 1kHz, 54dB @ f = 10kHz	60μA
TLV1117LV (3.3V version) (modern version of AMS1117)	3.3V (adjustable versions exist)	1A	6V	455mV @ 1A	65dB @ f = 1kHz	100μA
AP7381	Fixed 2.8V, 3.3V, 5V, 7V versions	150mA	40V	1V @ 100mA	60dB	2.5μA
LDI55-ADEEN (made in Germany!)	Adjustable	1A	50V	150mV @ 150mA	65dB @ 1kHz	25μA (0.1μA when shut down)

Operational amplifiers (opamps)

The main criterion when looking for opamps for me was rail-to-rail input and output capability. Other criteria were price, availability, legacy, and personal familiarity. All of these are rail-to-rail capable. Note that max current will naturally be also limited by the fact that opamps convert waste power into heat (exactly like LDOs), so be careful with high voltages.

Name	Channels	Supply voltage	Max current (per channel)	Max frequency/GBP	CMRR	Notes
MCP6001/6002/6004	Available in 1, 2, 4 variants	1.8V – 6.0V	6mA @ 1.8V, 23mA @ 6.0V	1MHz	76dB typical	Very good standard op-amp, available from many second-sources, common mode input beyond rails.
TSV7721/7722/7723	Available in 1, 2 variants	1.8V – 5.5V	65mA @ 5.0V	22MHz	96dB typical	Extremely good specs for sensor-related signal conditioning.
MCP6Vx	Available in 1, 2, 4 variants	Available in 5.5V and 45V variants	15mA @ 2.4V, 40mA @ 5.5V, 36mA @ 45V	80kHz – 10MHz	109dB – 135dB minimum	Many variants characterized by zero drift, zero input offset, high EMI rejection, high PSRR, high CMRR – perfect for precision circuits.
LMV321/358/324	Available in 1, 2, 4 variants	2.7V – 5.5V	60mA source, 160mA sink @ 5.0V	1MHz	63dB typical	Drop-in replacement for extremely popular LM321/LM358/LM324 series with rail-to-rail capability, available from many second-sources.
TLV936x	Available in 1, 2, 4 variants	4.5V – 40V (also ±2.25V – ±20V)	60mA	10.6MHz	110dB typical	Excellent high-voltage performance (drift, offset, noise density, EMI rejection) at a relatively low price.