Specifications
| Type | Description |
|---|---|
| Part Number | ZM4728A |
| Manufacturer | Vishay |
| Product Type | LDO Regulator |
| Category | Power Management |
| Component Type | Passive |
| Package Case | MELF (DO-213AB) glass; body length 4.8-5.2 mm, diameter 2.4-2.6 mm, terminal diameter 0.55 mm |
| Nominal Zener Voltage | 3.3 V; IZT1=76 mA, Tamb=25°C, thermal equilibrium DC test conditions |
| Zener Voltage Tolerance | ±5 %; standard tolerance |
| Zener Test Current IZT1 | 76 mA; VZ measurement for ZM4728A |
| Reverse Leakage Current IR | 100 µA max.; VR=1 V, Tamb=25°C |
| Reverse Voltage for Leakage Test | 1 V; IR=100 µA max. |
| Dynamic Resistance ZZ at IZT1 | 10 Ω max.; f=1 kHz, Tamb=25°C |
| Dynamic Resistance ZZK at IZT2 | 400 Ω max.; f=1 kHz, Tamb=25°C |
| Surge Current IZSM | 1380 mA max.; test pulse width=8.3 ms |
| Regulator Current IZM | 276 mA max.; electrodes kept at ambient temperature |
| Power Dissipation | 1000 mW; Tamb=25°C, electrodes kept at ambient temperature |
| Junction-to-Ambient Thermal Resistance | 170 K/W; electrodes kept at ambient temperature |
| Junction Temperature | 175 °C; absolute maximum rating |
| Storage Temperature Range | -65 to +175 °C; absolute maximum rating |
| Circuit Configuration | Single; primary characteristics |
| Package Weight | approx. 135 mg; MELF (DO-213AB) glass package |
| Moisture Sensitivity Level | MSL level 1; according to J-STD-020 |
| Peak Soldering Temperature | 260 °C max.; package soldering conditions |
| Molding Compound Flammability Rating | UL 94 V-0; MELF glass package |
| Alternative Case Type | DO-41; available with type designation 1N4728A to 1N4761A |
| Footprint Recommendation | 1.25 mm min., 4.00 mm max., 6.50 mm ref.; MELF DO-213AB package footprint |
| Datasheet Status | request_only |
Product Overview
The Vishay ZM4728A is a single Zener diode classified under Power_Management and supplied in a MELF (DO-213AB) glass package. Its nominal Zener voltage is 3.3 V with a standard ±5 % tolerance, measured at IZT1=76 mA with Tamb=25°C under thermal equilibrium DC test conditions.
Key Features
- 3.3 V nominal Zener voltage at 76 mA test current
- Standard Zener voltage tolerance of ±5 %
- 1000 mW power dissipation at Tamb=25°C
- 10 Ω maximum dynamic resistance at IZT1
- 100 µA maximum reverse leakage at 1 V
- 1380 mA maximum surge current, 8.3 ms pulse
- 276 mA maximum regulator current with ambient electrodes
- Single circuit configuration in MELF glass package
- MSL level 1 according to J-STD-020
- 260°C maximum peak soldering temperature
Typical Applications
- 3.3 V voltage regulation
- Zener reference circuits
- Reverse leakage limited designs
- Surge pulse clamping paths
- Single-diode power management nodes
- MELF DO-213AB board assemblies
- Thermally constrained regulator circuits
Procurement Notes
When requesting a quote for ZM4728A, 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 ZM4728A?
ZM4728A has a nominal Zener voltage of 3.3 V. The datasheet condition states IZT1=76 mA, Tamb=25°C, and thermal equilibrium DC test conditions for the voltage measurement.
What package is used for the Vishay ZM4728A?
The device uses a MELF (DO-213AB) glass package with 4.8-5.2 mm body length, 2.4-2.6 mm diameter, and 0.55 mm terminal diameter. The listed package weight is approximately 135 mg.
What are the main current and power limits?
The extracted limits include 1000 mW power dissipation at Tamb=25°C, 276 mA maximum regulator current with electrodes at ambient temperature, and 1380 mA maximum surge current for an 8.3 ms pulse.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 26, 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.