Product Overview
Siliconix MPSA27 60V 500mA High-Gain NPN Darlington Pair
Condition
Unused new old stock (NOS). Straight, untrimmed through-hole wire leads. Markings legible: Siliconix logo, MPS A27. Sold individually.
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Product Overview
Engineered for high-gain amplification and low-level switching, the MPSA27 pairs two integrated bipolar junctions in a compact through-hole package. With a minimum DC current gain of 10,000 at 100 mA, it allows microamp-level base currents from sensitive logic lines to control collector loads up to 500 mA.
Key Features
- 60 V collector-emitter breakdown voltage (V_CES / V_CEO)
- 500 mA continuous collector current rating (I_C)
- Minimum DC current gain (h_FE) of 10,000 at 100 mA
- 625 mW maximum device power dissipation
- Standard TO-92 plastic package with straight leads
Applications
- Driving relays, indicator lamps, and small solenoids directly from sensitive logic pins
- Audio preamplifier input stages requiring exceptionally high input impedance
- Sensor signal booster circuits and touch-sensitive electronic switches
Frequently Asked Questions
What is the pinout configuration for this TO-92 package?
Looking at the flat face with the leads pointing downward, pin 1 (left) is the emitter, pin 2 (center) is the base, and pin 3 (right) is the collector.
What standard replacements cross-reference to the MPSA27?
Direct industry crosses include the MPS-A27, NTE46, and standard 60V TO-92 NPN Darlington equivalents with matching E-B-C pinouts.
High-gain Darlingtons are the quiet workhorses that turn a whisper from a circuit into enough current to pull a real switch. Drop one into your board, hook up the base, and let two transistors do the heavy lifting in the space of one.
