Specifications
| Type | Description |
|---|---|
| Part Number | 1N5221 |
| Manufacturer | Vishay |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | DO-35 (DO-204AH) |
| Nominal Zener Voltage | 2.4 V; at IZT1=20 mA |
| Zener Voltage Tolerance | ±5 % (B suffix), ±2 % (C suffix) |
| Reverse Leakage Current | 100 µA max; VR=1 V |
| Dynamic Resistance ZZ | 30 Ω max; f=1 kHz, IZT1=20 mA |
| Knee Dynamic Resistance ZZK | 1200 Ω max; f=1 kHz, IZT2=0.25 mA |
| Temperature Coefficient | -0.085 %/K typ |
| Power Dissipation | 500 mW; TL ≤ 25 °C |
| Forward Voltage | 1.1 V max; IF=200 mA |
| Junction Temperature | 175 °C |
| Moisture Sensitivity Level | MSL level 1 |
| Datasheet Status | request_only |
Product Overview
The Vishay 1N5221 is a single small signal Zener diode for Power_Management use, with voltage stabilization listed as its application. Its nominal Zener voltage is 2.4 V at IZT1 = 20 mA, Tamb = 25 °C, and thermal equilibrium. Ordering-code tolerances are ±5 % for the B suffix, such as 1N5221B, and ±2 % for the C suffix, such as 1N5221C.
Electrical characterization includes IZT2 = 0.25 mA, 100 µA maximum reverse leakage at VR = 1 V, 30 Ω maximum dynamic resistance at 1 kHz and IZT1, and 1200 Ω maximum knee dynamic resistance at 1 kHz and IZT2. The typical temperature coefficient of Zener voltage is -0.085 %/K at Tamb = 25 °C.
The package is DO-35 (DO-204AH), with an approximate package weight of 125 mg. Package and assembly facts include UL 94 V-0 molding compound flammability rating, MSL level 1 according to J-STD-020, and 260 °C maximum soldering peak temperature.
Key Features
- 2.4 V nominal Zener voltage at 20 mA
- ±5 % and ±2 % tolerance ordering codes
- 100 µA max leakage at 1 V reverse
- 30 Ω max dynamic resistance at 1 kHz
- 1200 Ω max knee resistance at 0.25 mA
- 500 mW power dissipation
- Single circuit in DO-35 package
- MSL level 1 per J-STD-020
- 260 °C max soldering peak temp
- UL 94 V-0 molding compound
Typical Applications
- Voltage stabilization
- 2.4 V Zener regulation
- Single diode stabilization circuits
- DO-35 through-hole assemblies
Procurement Notes
When requesting a quote for 1N5221, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What is the nominal Zener voltage of 1N5221?
The Vishay 1N5221 has 2.4 V nominal Zener voltage at IZT1=20 mA and Tamb=25 °C.
What package is used for the 1N5221?
The 1N5221 uses a DO-35 (DO-204AH) package with 3.9 mm max body length and 1.7 mm max body diameter.
What leakage current limit applies?
100 µA maximum reverse leakage at VR=1 V and Tamb=25 °C.
What tolerance options are available?
B suffix offers ±5 % tolerance, C suffix offers ±2 % tolerance.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 19, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.