SMD marking

33D

Marking codes are not standardised, and the same code is reused by unrelated makers for unrelated parts. Below is every part in our tables printed with it, and any printed with a code that is easy to misread as it, from the manufacturers' own marking tables.

33D on a chip resistor

215 kΩ

215 kΩ resistor, 1%

EIA-96 precision code: 33 selects 2.15 from the E96 series and D multiplies by 100000. These are 1% parts.

Check it with a meter

Lift one end and measure across it. A good one reads 215 kΩ within 1%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 215 kΩ on the board is a fault. Open, or well above 215 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 215 kΩ. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.

On a transistor or diode body (SOT-23, WSON), 33D is a part code instead. Those parts are listed below.

The only part printed 33D in our tables

PLZ33D

What it is: Zener diode
Maker: Vishay
Package: Not recorded
Pins: Not recorded
Details: 33 V Zener diode
Source: From the manufacturer's datasheet

Is it dead?

Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.

Working, it reads

About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.

Dead, it reads

The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
Open both ways, forward too: failed open.
Holds well off its rated voltage on the supply test: drifted.
A soft knee, or a voltage that creeps on the supply test: leaky.

On the board:: On the board this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:: If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:: A meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.

A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

Datasheet

4 more parts have codes that begin with 33D

Codes that begin with 33D

For a marking with its end worn or burnt off. Each one shows its full printed code.

all Texas Instruments. What differs:

TLV803EA30DBZprinted 330ASOT-23Voltage supervisor, 3 pinsVoltage supervisorSOT-233 pins
Printed 330A. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
Texas Instruments
Package
SOT-23
Pins
3
Details
Low Power 250-nA IQ and Small Size Supply Voltage Supervisors
Source
From the manufacturer's datasheet
Is it dead?
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
Supply present, output stuck: failed, or its load has.
On the board:
A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
Compare:
The surest reference is the same IC on a working board, measured pin by pin.
Watch for:
Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor TLV803EA30DBZ, opens in a new tab
TLV803EC30DBZprinted 330CSOT-23Voltage supervisor, 3 pinsVoltage supervisorSOT-233 pins
Printed 330C. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
Texas Instruments
Package
SOT-23
Pins
3
Details
Low Power 250-nA IQ and Small Size Supply Voltage Supervisors
Source
From the manufacturer's datasheet
Is it dead?
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
Supply present, output stuck: failed, or its load has.
On the board:
A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
Compare:
The surest reference is the same IC on a working board, measured pin by pin.
Watch for:
Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor TLV803EC30DBZ, opens in a new tab
TPS7A1409PDRVprinted 33QHWSONLDO regulator, 6 pinsLDO regulatorWSON6 pins
Printed 33QH. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
LDO regulator
Maker
Texas Instruments
Package
WSON
Pins
6
Details
1-A, Low VIN, Low VOUT, Ultra-Low Dropout Regulator
Source
From the manufacturer's datasheet
Is it dead?
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
Power off, input to output near 0 Ω: shorted.
On the board:
An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
Compare:
The same regulator on another rail or another board shows the right voltages and the right resistances.
Watch for:
Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor TPS7A1409PDRV, opens in a new tab
1 more part has no package on record
- TPS563300DRLprinted 3300DC-DC converter, 8 pinsDC-DC converterNot recorded8 pins
  Printed 3300. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
  What it is
  DC-DC converter
  Maker
  Texas Instruments
  Package
  Not recorded
  Pins
  8
  Details
  3.8-V to 28-V, 3-A Synchronous Buck Converter in SOT583 Package
  Source
  From the manufacturer's datasheet
  Is it dead?
  Voltage with the board powered; ohms from each pin to ground with it off.
  Working, it reads
  Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
  Dead, it reads
  A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  Supply present, output stuck: failed, or its load has.
  On the board:
  A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
  Compare:
  The surest reference is the same IC on a working board, measured pin by pin.
  Watch for:
  Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
  Datasheetfor TPS563300DRL, opens in a new tab

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