56 V zener in hermetic SQ-MELF — active and available
The 1N6342US/TR is a 56 V zener diode from Microchip Technology in a hermetic SQ-MELF (B) package, rated for 500 mW continuous power dissipation. The ±5% tolerance covers the standard regulation band for general-purpose voltage clamping and reference applications.
Thermal and leakage profile for harsh environments
The -65°C to 175°C operating temperature range qualifies the 1N6342US/TR for military, aerospace, and downhole applications where commercial-grade zeners fail. The hermetic SQ-MELF package seals the die against moisture and thermal cycling — no conformal coat needed for the diode itself. Reverse leakage is specified at 50 nA maximum at 43 V reverse voltage — a low-leakage figure for a 56 V device, which matters when the zener sits across a high-impedance node like an op-amp supply or a precision reference. The maximum zener impedance (Zzt) is 100 Ohms, which sets the regulation slope: at low bias current the output voltage shifts more per mA than a lower-impedance part. Forward voltage is 1.4 V maximum at 1 A — the diode can conduct forward current for transient clamping, though the 500 mW power limit governs continuous duty.
Tape & Reel — surface-mount assembly ready
Supplied in Tape & Reel (TR) packaging, the 1N6342US/TR feeds directly into pick-and-place lines. The SQ-MELF footprint is a standard surface-mount package with a cylindrical body and end-cap terminations — the same land pattern as other MELF diodes, so no board spin if replacing a similar device.