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onsemi ESD5Z3.3T1 — Circuit Protection

ESD5Z3.3T1 onsemi ESD Protection Diode, 3.3V, SOD-523

MPNESD5Z3.3T1
Obsolete

onsemi ESD5Z3.3T1, Zener-type ESD protection diode, 3.3V reverse standoff, 14.1V clamping at 11.2A (8/20µs), 105pF capacitance, SOD-523 package

$0.3500Ref. price · indicative, final on quote
onsemi ESD5Z3.3T1 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

ESD5Z3.3T1 specifications
ParameterValue
TypeZener
MountingSurface Mount
Voltage - breakdown5V
Voltage - clamping (Max) @ ipp14.1V
Voltage - reverse standoff3.3V (Max)
Current - peak pulse (10/1000μs)11.2A (8/20µs)
Power - peak pulse158W
Power line protectionNo
Capacitance @ frequency105pF @ 1MHz
Operating temperature-55°C~150°C(TJ)
PackageTape & Reel (TR)
ApplicationsGeneral Purpose
CaseSC-79, SOD-523
Unidirectional channels1

Product details

Confirm the package (SOD-523,) and the 3.3V standoff rating before committing a replacement; a parametric match from another vendor may require a footprint change.

3.3V rail protection — clamping and capacitance

The clamping voltage is 14.1V at the peak pulse current of 11.2A (8/20µs waveform). That 14.1V ceiling is the voltage the protected IC sees during an ESD strike; check that your downstream device's absolute-max rating leaves margin above 14.1V. Capacitance is 105pF at 1MHz. On a 3.3V signal line running at, say, 12MHz or below, 105pF is generally fine — the RC time constant with a typical source impedance stays under a quarter-bit period. For USB 2.0 (480Mbps) or HDMI, that capacitance starts to degrade eye-diagram margin; a sub-1pF TVS diode would be a better fit for high-speed differential pairs.

SOD-523 footprint and temperature range

Housed in the SOD-523 package (SC-79 equivalent,) — a 0.80mm x 1.25mm body with 0.50mm pitch leads. No power-line protection — this is a signal-line ESD clamp, not a surge-rated TVS for power inputs.

Frequently asked questions

How can I order the ESD5Z3.3T1 or check stock?

The ESD5Z3.3T1 is obsolete and not in active factory production. We source it through our independent distribution network — submit an RFQ with your target quantity and we will confirm availability and current pricing at quote time. No stock-holding claim is made here; every order is sourced per your BOM line.

Is the ESD5Z3.3T1 obsolete?

Yes, onsemi lists the product status as Obsolete. No direct replacement part number has been published by onsemi. For a new design, consider a current-production Zener ESD suppressor in SOD-523 with a 3.3V standoff — confirm the clamping voltage and capacitance match your margin requirements.

Does the ESD5Z3.3T1 work for 3.3V circuits?

Yes. The reverse standoff voltage is 3.3V max, so it clamps once the line exceeds 3.3V — a direct fit for 3.3V logic I/O or power rails. The 105pF capacitance is acceptable for low-to-moderate speed signals but may be too high for high-speed differential interfaces like USB 2.0 or HDMI.

What is the capacitance of the ESD5Z3.3T1?

Typical capacitance is 105pF measured at 1MHz. This is a moderate value — suitable for general-purpose I/O and lower-speed buses, but not ideal for high-speed differential pairs where sub-1pF devices are preferred.