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Microchip Technology 1N4733AURE3/TR — Discrete Semiconductors
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Microchip Technology / Discrete Semiconductors

Microchip 1N4733AURE3/TR Zener Diode, 5.1 V, 1 W, DO-213AB

MPN 1N4733AURE3/TR
Active Spot Stock · 24-48h Dispatch 100% Original Sealed

Microchip Technology 1N4733AURE3/TR Zener Diode, 5.1 V nominal, 1 W, ±5% tolerance, DO-213AB MELF glass package, surface mount.

In Stock: 255 pcs
MOQ: 1 pcs
Logistics: DHL / FedEx DAP (Global Express · 3-7d) Russia & CIS DDP (Door-to-Door Cleared)
Dispatch: Shenzhen / HK
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$3.58 / pc
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Volume Pricing Breaks Confirmed upon quotation
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[SPEC] Essential Parameters Snapshot Full Specifications (10)
Package / Case DO-213AB, MELF (Glass)
ALT
Facing long factory lead times or allocation on 1N4733AURE3/TR? Verified pin-compatible alternatives available with active Shenzhen stock and 100% solder-ready footprint match.
View Pin Alternates (3)

Full Technical Specifications

10 Parameters
1N4733AURE3/TR specifications
Parameter / AttributeSpecification / Value
MountingSurface Mount
Voltage - zener (Nom)5.1 V
Voltage - forward (Vf) (Max) @ if1.2 V @ 200 mA
Current - reverse leakage @ vr10 µA @ 1 V
Power - max1 W
Operating temperature-65°C ~ 175°C
PackageTape & Reel (TR) Cut Tape (CT)
Tolerance±5%
CaseDO-213AB, MELF (Glass)
Impedance (Max)7 Ohms
100% Footprint Match · Solder-Ready (No PCB Redesign Needed)

Need Stock or a Drop-in Second-Source for 1N4733AURE3/TR?

Package: DO-41 (DO-204AL) glass · Pin-compatible replacements with immediate Shenzhen spot stock

Footprint Match 99%
Supply Chain & Allocation Reality:

The 1N4728A to 1N4764A row is the general-purpose 1-watt zener drawer of every repair bench: 37 voltage steps from 3.3V to 100V in the DO-41 glass body, with the 5.1V 1N4733A the most ordered of them all. Two letters carry all the grading a buyer needs - the suffix letter is the tolerance (A = 5 percent, none = 10, C = 2, D = 1) and the middle digits are the voltage - and one lookalike carries the trap: the European BZX55 family covers the same voltages at HALF the dissipation in a smaller DO-35 body. The page exists for the swap where a 500mW part quietly replaces a 1W one and the rail drifts hot.

Verified Pin-Compatible Replacements (3 verified alternatives)

BZX55C5V1 Vishay / NXP lineage / multiple DO-35
Functional Equivalent
Availability & Target Pricing:

The European 500mW Counterpart

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The European naming of the same voltage range: 5.1V nominal in a DO-35 body rated at 500 milliwatts - half the dissipation class of the 1N47xx row, with its own tolerance letters on its own datasheet scale.

Same voltage, different power: the substitution is a dissipation decision before it is a pin decision.

Compatibility & Drop-In Notes: The rule for the two naming worlds: read the power number first (1W against 0.5W), the voltage second, the tolerance letter last - each family grades with its own letters.
Package & Solder Footprint: DO-35 against DO-41: physically smaller, same two leads.
Shenzhen Warehouse Stock & MOQ: Stocked; quote the power class the circuit actually needs.
Request Volume Quote for BZX55C5V1 Compare 1N4733AURE3/TR vs BZX55C5V1 Spec Matrix
1N4733AUR / MLL4733A Microchip (Microsemi) / Central DO-213AB (MELF, SMD)
Functional Equivalent
Availability & Target Pricing:

The Same Die for SMD Boards

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The surface-mount form of the same family: the same 1W 5.1V grade in the MELF body, for boards built after the through-hole era and for rework on them.

Identical electricals across the through-hole and MELF rows.

Compatibility & Drop-In Notes: When substituting toward the axial part (MELF unavailable), the lead forming radius and the board clearance are the only open items - the electricity does not change.
Package & Solder Footprint: DO-213AB MELF footprint; the axial DO-41 does not fit it and the reverse needs lead forming.
Shenzhen Warehouse Stock & MOQ: Stocked in both forms; state the footprint when quoting.
Request Volume Quote for 1N4733AUR / MLL4733A Compare 1N4733AURE3/TR vs 1N4733AUR / MLL4733A Spec Matrix
1N4733C / 1N4733D Microchip (Microsemi) / Central DO-41
100% Drop-in (Zero Code Change)
Availability & Target Pricing:

The 2 Percent and 1 Percent Grades

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The precision grades of the same voltage: C at 2 percent and D at 1 percent tolerance against the 5 percent of the common A suffix - exact drop-ins where accuracy was the design point.

Same nominal, tighter window: the grade buys certainty, not headroom.

Compatibility & Drop-In Notes: Direction rule: precision upward is always free; dropping from a graded part to the 10 percent no-suffix member is the substitution that quietly re-opens a margin someone calculated.
Package & Solder Footprint: Identical DO-41 body.
Shenzhen Warehouse Stock & MOQ: Stocked by grade; order with the suffix the schematic asked for.
Request Volume Quote for 1N4733C / 1N4733D Compare 1N4733AURE3/TR vs 1N4733C / 1N4733D Spec Matrix
Buyer & Quality Checklist for Sourcing Alternatives
  • The suffix is the business letter: A is 5 percent, no suffix is 10 percent, C is 2 percent, D is 1 percent. The 1N4733A 5.1V window is 4.84V to 5.36V - a 10 percent stand-in widens that to nearly a volt of legal span.
  • Voltage lives in the digits: 1N4728A is 3.3V and 1N4764A is 100V - 37 steps of the same glass body, sold in adjacency. Read the whole number; the drawer mix-up between neighboring voltages is the most common zener repair error there is.
  • Power class is the body, not the name: this row is 1W DO-41; the European BZX55 line is 500mW DO-35 and the BZX85 line 1.3W. Substituting downward in power is legal only after the series-resistor current is computed against the smaller rating.
  • The regulating current sets the resistor, not just the voltage: this family specifies its test current (49mA for the 5.1V part) - a repair that changes voltage but keeps the old series resistor can push the new diode out of regulation or into thermal drift.
  • The 5.x V zeners sit near the temperature-coefficient sweet spot (around 5.6V): the near-zero drift is why designs picked them for reference-ish duty - moving the voltage away changes behavior beyond the nominal value.
  • Glass bodies fail loudly and innocently: a cracked DO-41 from lead-forming stress reads open weeks later. Inspect and strain-relieve leads when replacing, and prefer MELF (AUR/MLL rows) only where the footprint exists.
Frequently Asked Technical Questions

Q: What does the A mean in 1N4733A?

A: Tolerance: A is plus or minus 5 percent. No suffix letter is 10 percent, C is 2 percent and D is 1 percent. The 5.1V 1N4733A therefore operates in a 4.84V to 5.36V window.

Q: Can I use a BZX55C5V1 instead of a 1N4733A?

A: The voltage matches but the power class does not: BZX55 is a 500mW DO-35 part against the 1W DO-41 of the 1N47 row. It works where the original ran cool, and drifts or fails where the series-resistor current actually used the watt.

Q: What is the voltage of a 1N4733A?

A: 5.1V nominal at a 49mA test current, with the 5 percent window spanning 4.84V to 5.36V, dynamic resistance around 7 ohms at that current. It is the most-ordered member of the 1N4728A-1N4764A 1W ladder.

Technical Details & Description

5.1 V regulation point and 1 W power budget

The 1N4733AURE3/TR is a 5.1 V zener diode in the 1N4733A family from Microchip Technology, rated for 1 W continuous power dissipation in a surface-mount DO-213AB MELF glass package. With a ±5% tolerance on the nominal 5.1 V zener voltage, the regulation window spans 4.845 V to 5.355 V — tight enough for most 5 V rail clamping or reference applications where a precision shunt regulator is not required. The 1 W power rating sets the thermal ceiling: at 5.1 V the diode can sink roughly 196 mA continuous before exceeding the dissipation limit, assuming adequate board-level heat sinking through the MELF end-cap terminations.

Package and temperature grade

The glass body provides hermetic sealing, making it suitable for environments where moisture resistance is a concern. Rated for operation from -65°C to 175°C, this diode covers the full military temperature range. The wide span suits designs that must hold regulation across extreme thermal cycling, such as avionics or down-hole instrumentation.

Dynamic impedance and leakage

Maximum zener impedance is 7 Ohms at the test current — a relatively low dynamic resistance for a 5.1 V part, which means the voltage stays within the ±5% band under moderate load steps. Reverse leakage is specified at 10 µA maximum at 1 V reverse bias, confirming the diode blocks cleanly below the zener knee. Forward voltage is 1.2 V maximum at 200 mA forward current — a standard silicon diode drop, useful if the part is ever biased in the forward direction for polarity protection or clamping.

Frequently asked questions

What is the tolerance on the 5.1 V zener voltage?

The tolerance is ±5%, so the actual zener voltage for any given unit will fall between 4.845 V and 5.355 V.

1N4733AURE3/TR
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