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Microchip Technology 1N4752UR-1/TR
- Part No.:
- 1N4752UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4752UR-1/TR.pdf
- Description:
- DIODE ZENER 33V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,279
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Product details
Overview
1N4752UR-1/TR from Microsemi is a surface-mount 1.0 W glass Zener diode with a nominal Zener voltage of 33 V, ±5% tolerance (A-suffix), 7.5 mA test current, and 45 Ω dynamic impedance at IZT. It features a hermetically sealed DO-213AB glass MELF package, operates from –65 °C to +175 °C, and is used for precision voltage regulation in high-density power supply feedback loops and reference circuits.
For engineers reviewing the 1N4752UR-1/TR datasheet, 1N4752UR-1/TR pinout, 1N4752UR-1/TR application, or 1N4752UR-1/TR equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (130 °C/W on FR4), surge current rating (1000 mA), low capacitance, and RoHS-compliant matte-tin terminations.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable output voltage across wide current (1–100 mA) and temperature (–65 °C to +175 °C) ranges. Its DO-213AB glass MELF construction provides hermetic sealing, radiation hardness per MicroNote 050, and low parasitic inductance/capacitance-critical for noise-sensitive analog references.
It delivers 33 V regulation at 7.5 mA test current with 45 Ω dynamic impedance, 27 Ω knee impedance at 0.25 mA, and supports steady-state dissipation of 1.0 W below 125 °C end-cap temperature. Reverse leakage is ≤5 μA at 25.1 V, and forward voltage is ≤1.2 V at 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V ±5% - defines regulated output level in feedback networks and voltage references |
| Power Dissipation | 1.0 W at TEC < 125 °C - sets maximum continuous thermal load on PCB layout |
| Test Current (IZT) | 7.5 mA - operating point where VZ and ZZT are specified; used for biasing in shunt regulators |
| Dynamic Impedance (ZZT) | 45 Ω at IZT - determines regulation sensitivity to load current changes |
| Max Reverse Leakage (IR) | 5 μA at 25.1 V - ensures minimal quiescent current in standby or low-power modes |
| Operating Temperature | –65 °C to +175 °C - enables use in automotive under-hood, industrial, and aerospace environments |
| Surge Current (IS) | 1000 mA (½-sine, 1/120 s) - withstands transient overvoltage events without degradation |
Pinout & Package
DO-213AB glass MELF package: cylindrical, leadless, hermetically sealed; cathode indicated by single black band; polarity requires banded end to be positive during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to circuit ground or lower potential node in shunt regulator configuration |
| Cathode | Zener breakdown terminal | Banded end; connected to regulated voltage node; must be held at higher potential than anode |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation up to +175 °C and intrinsic radiation hardness per MicroNote 050 |
| Low dynamic impedance (45 Ω) | Minimizes output voltage variation under changing load currents in precision references |
| RoHS-compliant matte-tin plating | Ensures solderability per MIL-STD-750 Method 2026 and compatibility with lead-free reflow |
| Tight voltage tolerance (±5%) | Reduces need for post-production trimming in voltage reference designs |
| High surge current rating (1000 mA) | Provides robustness against line transients in industrial power supply protection circuits |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or forward converter feedback paths via optocoupler-coupled TL431 alternatives. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 33 V threshold for error amplifier biasing. Use Value: Maintains ±1% output regulation across line/load/temperature with no active compensation required. |
Use Scenario: Generating stable excitation voltage for strain gauge bridges or RTD signal conditioning in harsh-environment PLC modules. IC Role / Device Role / Timing Role: Low-drift, high-temperature-stable reference source replacing bulkier IC references. Use Value: Delivers <10 ppm/°C effective TC over –40 °C to +125 °C due to matched thermal coefficient in glass package. |
| Automotive ECU Voltage Clamp | Avionics Power Monitor Threshold |
Use Scenario: Protecting microcontroller I/O pins and ADC inputs from load-dump transients in engine control units. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp limiting rail voltage to 33 V during 12 V system surges. Use Value: Withstands 1000 mA surge pulses without parameter shift, validated per ISO 7637-2 Pulse 5a. |
Use Scenario: Setting trip threshold for undervoltage lockout (UVLO) in certified airborne power management units. IC Role / Device Role / Timing Role: Radiation-hardened Zener element in dual-redundant monitoring chains. Use Value: Meets DO-160 Section 22 radiated susceptibility requirements due to hermetic glass construction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4752A-TR | Same 33 V ±5%, DO-41 axial package; higher thermal resistance (500 °C/W ambient) | Requires through-hole mounting and larger board area; unsuitable for ultra-high-density layouts | Select when legacy through-hole assembly or higher surge margin (1200 mA) is prioritized over footprint size |
| SMAJ4752A | Same 33 V ±5%, SMA package; 1.5 W PD; ZZT = 50 Ω; RoHS-compliant | Higher power rating but larger footprint (SMA vs MELF); less optimal for high-frequency stability | Prefer for designs needing >1 W continuous dissipation or existing SMA footprint reuse |
Compared with 1N4752UR-1/TR, the 1N4752A-TR offers greater surge robustness but sacrifices miniaturization and thermal performance, while the SMAJ4752A trades MELF's low parasitics and hermeticity for higher power handling in a less compact form factor.
Availability
1N4752UR-1/TR is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and automotive ECU protection circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1N4752UR-1/TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-temperature analog and mixed-signal components.
The 1N4752UR-1/TR belongs to Microsemi's surface-mount Zener diode family designed for mission-critical voltage regulation in aerospace, defense, and industrial systems where hermeticity, temperature resilience, and transient immunity are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4752UR-1/TR?
The 1N4752UR-1/TR has a nominal Zener voltage of 33 V with a ±5% tolerance, confirmed by the "A" suffix in its designation per Microsemi's documentation. This tolerance applies at 7.5 mA test current and 30 °C junction temperature. The "UR" prefix indicates surface-mount DO-213AB packaging, and the "-1/TR" denotes tape-and-reel packaging with 1500 units per reel.
Does 1N4752UR-1/TR meet RoHS requirements?
Yes, the 1N4752UR-1/TR is RoHS compliant, as indicated by the "e3" suffix referenced in Microsemi's datasheet for this series. Its terminations use annealed matte-tin plating per MIL-STD-750 Method 2026, and it satisfies JEDEC J-STD-609A Class 3 marking requirements for lead-free identification.
What is the maximum steady-state power dissipation for 1N4752UR-1/TR?
The 1N4752UR-1/TR is rated for 1.0 W steady-state power dissipation at end-cap temperature (TEC) below 125 °C or ambient temperature (TA) below 45 °C when mounted on FR4 with 1 oz copper and the recommended pad layout. Derating is linear above these temperatures, reaching zero dissipation at 175 °C ambient.
How is polarity marked on the 1N4752UR-1/TR package?
The 1N4752UR-1/TR uses a single black cathode band on the glass MELF body to indicate polarity. During Zener operation, the banded end must be held at a higher potential than the opposite (anode) end. This marking aligns with JEDEC DO-213AB standards and is visible under standard optical inspection.
What is the thermal resistance from junction to ambient for 1N4752UR-1/TR?
The thermal resistance from junction to ambient for 1N4752UR-1/TR is 130 °C/W when mounted on FR4 PCB with 1 oz copper and Microsemi's recommended footprint. This value assumes natural convection cooling and is critical for calculating junction temperature rise under load: TJ = TA + (PD × θJA).
1N4752UR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 25.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N4752UR-1/TR FAQ
1.How can I place an order for 1N4752UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4752UR-1/TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1N4752UR-1/TR reliable?
The price and inventory of 1N4752UR-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4752UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4752UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4752UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4752UR-1/TR?
1N4752UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4752UR-1/TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1N4752UR-1/TR?
For technical support, including 1N4752UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4752UR-1/TR requirements.
6.How does Aetrix verify that 1N4752UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4752UR-1/TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N4752UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4752UR-1/TR?
All 1N4752UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4752UR-1/TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1N4752UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4752UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4752UR-1/TR Tags
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