| Distributor | Stock | Pricing | MOQ | PKG | Lead Time | Date Code | On Order Quantity | On Order Delivery | |
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7,861 pcs
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7861 pcs | On Request | 1 | On Request | On Request | On Request | On Request | On Request |
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| SVHC Present |
The UC1843A-SP from Texas Instruments is a radiation-hardened, pin-for-pin compatible version of the UC184x family, designed for current-mode switched-mode power supplies. It offers features such as low start-up current (< 0.5 mA), trimmed oscillator discharge current (8.3 mA), and high-current totem-pole output.
This controller supports various topologies including Flyback, Forward, Buck, Boost, Push-Pull, Half-Bridge, and Full-Bridge with external interface circuits. It is optimized for offline and DC-to-DC converters and operates at frequencies up to 500 kHz. The device includes undervoltage lockout (UVLO) with hysteresis and double-pulse suppression.
Designed for demanding environments, the UC1843A-SP is QML Class V (QMLV) Qualified and offers radiation hardness assurance up to 30-krad(Si) Total Ionizing Dose (TID). It is available in the military temperature range of -55°C to 125°C. Packages include CDIP, LCCC, and CFP.
Key electrical features include automatic feed-forward compensation, pulse-by-pulse current limiting, and an internally-trimmed bandgap reference. The output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V during UVLO.
| Qty | Low | High |
|---|---|---|
| 1+ | $0.78 | $0.78 |
Estimated market price range - modelled values for guidance only, not live distributor offers.
The UC1843A operates at up to 500 kHz.
The start-up current is less than 0.5 mA.
The operating temperature range is -55°C to 125°C.
The UC1843A has radiation hardness assurance up to 30 krad(Si) Total Ionizing Dose (TID) and passes specified limits at 45 krad at Low Dose Rate (LDR).
The UC1843A is available in CDIP (8), LCCC (20), and CFP (10) packages.
