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Atlas DCA - Semiconductor Component Analyser
Model DCA55
(Latest firmware R4.0x)
Atlas Star Pack
You can save money with the Atlas Star Pack
New edition! Now with backlit display, AAA battery power and finer measurement resolution!
Pricing (and terms)
  51.00 inc VAT (42.50 + VAT)  
UK shipping starts at 4.00+VAT (4.80) depending on weight. Overseas shipping is charged according to destination and weight and shown before you confirm your acceptance.
Payments are made in UK Pounds and will be converted to your local currency by your payment provider, we have no control over the exchange rate used.
DCA55 
If you prefer not to order online then don't hesitate to call us on +44 (0)1298 70012 or click here to find your nearest distributor.
If you're outside the UK then our overseas distributors can offer you competitive pricing and much faster delivery
See the Atlas DCA55 in action here:

(opens in a new tab)

See the DCA55 on YouTube
Backlit display. AAA Battery. Tough Probes.
Identify the type and pinout of almost any discrete semiconductor
Just connect your component any way round and press the test button. The Atlas DCA55 will then present you with detailed component information in concise, easy to read, scrollable pages. The displayed information will include: the component type, special component features, component pinout, and measured parameters (such as gain, leakage current, gate threshold voltages, volt drops etc...). No more searching through data books and catalogues in order to identify components and pinouts.

Examples of screenshots for just a few components

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Features Components Supported
  • Connect your component any way round.
  • Automatic part type identification (not the part number).
  • Automatic full pinout identification (only gate of JFETs is identified).
  • Important parameter measurements including:
  • Current gain measurement (hFE) of BJTs.
  • Base-Emitter voltage drops (Vbe) of BJTs.
  • Leakage current of BJTs.
  • Gate threshold (Vgs) of Enhancement mode MOSFETs.
  • Voltage drops (Vf) of PN junctions, diodes, LEDs etc.
  • Distinguishes between germanium and silicon BJTs.
  • Long battery life (alkaline battery included).
  • Includes high quality gold plated hook probes.
  • Includes detailed illustrated user guide.
  • 24 month warranty.
  • NPN/PNP Transistors (BJTs) and Darlingtons.
  • Digital transistors.
  • Enhancement mode MOSFETs.
  • Depletion mode MOSFETs (Vgs not measured).
  • JFETs (only gate identified).
  • Sensitive triacs and thyristors (<5mA trig and hold).
  • Diodes.
  • Diode networks.
  • LEDs.
  • Bi-Colour LEDs (2 and 3 lead types).
Atlas DCA testing a BFY51
Atlas DCA testing a bicolour LED Atlas DCA testing a diode
Simplicity
There is no on/off switch, power is automatically turned on at the start of an analysis and then automatically turned off if inactive for more than 60 seconds. Each page of displayed information is presented in manageable amounts, with each page being displayed when you want it. If you want to concentrate on the "pinout" page then just select that page, you don't have to see information that you don't need.

The Atlas DCA Package 
The Peak Atlas DCA is supplied complete with a long life battery, universal test probes and a comprehensive illustrated user guide. Furthermore, free and unlimited technical support and advice is available to all users by telephone, email or our web site.

Specifications

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Atlas DCA55 - Frequently Asked Questions (FAQs)
  Is the DCA55 ok with germanium transistors, can it measure leakage current and does it take into account the leakage current for it's gain measurement? Yes. The DCA55 will detect the germanium (or silicon) type of semiconductor. It will measure leakage current and it takes that leakage into account when measuring gain (unlike most multimeter hFE measurements).  
I've noticed the leakage current of my germanium transistor gradually drop with each subsequent measurement. Is my DCA55 battery failing or something else wrong? Leakage current is extremely temperature dependent and particularly noticeable for germaniums as the current is fairly high to start with. The leakage current can double for just a 5C increase in temperature. So after some handling, the transistor temperature slowly falls and can lead to a decreasing leakage current. That's completely normal and correct. Additionally, DCA55 test currents are completely independent of battery condition.
The Collector and Emitter of my germanium transistor is showing the wrong way round, is the DCA55 wrong? If the leakage current of the germanium transistor is quite high (due to warming from your fingers for example), the DCA55 can reject the "correct" pinout. However, it will then search for all other device types and configurations. It can, in those circumstances, find a transistor with the C-E swapped (although gain can be very low). Tests in a simple circuit confirm that you can get a germanium transistor to work, with some gain, in that way. So the DCA55 is not wrong, it's just found a configuration that yields a low leakage current. Try keeping your transistor cool during testing to avoid this situation.
Can the Atlas DCA55 measure Zener diodes? Perhaps low voltage ones? No, the DCA55 doesn't currently support Zener diodes. Low voltage (<5V) zener diodes can lead to confusing results although the displayed forward voltage may represent the Zener voltage which can be useful. Higher voltage Zeners (>5V) will be shown as a regular diode and the forward voltage will be the voltage of the pn junction not the zener voltage).
Can I use the DCA55 to match transistors? Yes. The main parameters that you may be interested in are hFE and VBE. Both of these parameters are measured by the DCA55. This enables you to group your transistors that have similar gain figures for example.
What will the DCA55 show if my component is faulty? Generally, the DCA55 would show "Faulty or unknown component". Sometimes it may still be able to see a pn (diode) junction within the component you're testing, in which case it would display "Diode or diode junction(s)". If there is a short circuit within your component then the DCA55 will display "Short circuit on RED GREEN" for example.
Can my Atlas DCA55 be upgraded online? The only way to upgrade the firmware is to send your unit to us. It's a very low cost process. Click here to see how to order an upgrade.
What is the latest version of the Atlas DCA55? The latest firmware version is 4.0x. This version adds support for the new hardware version (backlight, finer measurement resolution etc).
Why can't the DCA55 analyse triacs or thyristors that need higher currents than 5mA? The test currents of the Atlas DCA55 are deliberately kept below 5mA to avoid damage to any potentially random component that can be connected any way round. The Peak Atlas SCR is aimed specifically at analysing a wide range of triacs and thyristors that require test currents from less than 100uA up to 100mA.
How long is the warranty period? All our products now have a warranty of 24 months. This doesn't cover accidental damage or abuse however.
   
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