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Microchip Technology 1N4729AUR/TR
- Part No.:
- 1N4729AUR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4729AUR/TR.pdf
- Description:
- DIODE ZENER 3.6V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,404
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Product details
Overview
1N4729AUR/TR from Microsemi is a surface-mount 1.0 W glass-encapsulated Zener diode with nominal Zener voltage 3.6 V ±5%, 69 mA test current, 10 Ω dynamic impedance at IZT, and maximum reverse leakage of 100 μA at 1 V. It operates from –65°C to +175°C and is used for precision voltage regulation in high-density power supply rails and reference circuits.
For engineers reviewing the 1N4729AUR/TR datasheet, 1N4729AUR/TR pinout, 1N4729AUR/TR application, or 1N4729AUR/TR equivalent, key selection criteria include Zener tolerance (±5%), thermal resistance (130°C/W on FR4), hermetic DO-213AB MELF package, surge current rating (1260 mA), and RoHS-compliant e3 variant availability.
Technical Context
This device functions as a two-terminal voltage reference diode operating in reverse breakdown. Its glass hermetic DO-213AB package ensures low parasitic capacitance and inherent radiation hardness per MicroNote 050, supporting high-reliability environments.
It delivers stable regulation across wide temperature (–65°C to +175°C) and current ranges, with specified knee impedance (400 Ω at 1 mA) and forward voltage ≤1.2 V at 200 mA - enabling bidirectional protection and low-loss biasing in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.6 V ±5% - defines precise regulation point for low-voltage reference rails |
| Power Dissipation | 1.0 W at TEC < 125°C - supports continuous operation in thermally constrained SMT designs |
| Test Current (IZT) | 69 mA - establishes operating point where dynamic impedance and voltage tolerance are guaranteed |
| Dynamic Impedance (ZZT) | 10 Ω at IZT - ensures minimal output voltage variation under load transients |
| Max Reverse Leakage | 100 μA at 1 V - confirms low standby current in battery-backed or ultra-low-power circuits |
| Operating Temperature | –65°C to +175°C - enables deployment in automotive under-hood, industrial, and aerospace environments |
| Surge Current (IS) | 1260 mA (½-sine, 1/120 s) - withstands short-duration overvoltage events without degradation |
Pinout & Package
DO-213AB glass MELF package: cylindrical, leadless, hermetically sealed, cathode marked by single band. Designed for reflow soldering (260°C/10 s max) on standard SMT footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher-potential rail; reverse-biased during regulation; polarity critical for correct operation |
| Anode (unbanded end) | Reference ground node | Typically tied to system ground or lower-potential bias point; completes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift; qualified for high-reliability applications per source control drawing |
| Inherent radiation hardness | Meets requirements for space-qualified and nuclear instrumentation systems without additional shielding |
| Low parasitic capacitance | Enables stable regulation in RF-adjacent and fast-switching power domains (see Figure 2 in datasheet) |
| Nonsensitive to ESD | Withstands human-body-model (HBM) discharges without screening or special handling protocols |
| RoHS-compliant e3 option | Matte-tin plating meets JEDEC J-STD-020 and EU Directive 2011/65/EU without lead or halogen restrictions |
Applications
| Industrial Power Monitoring | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Voltage reference for analog-to-digital converters measuring 5 V system rails in programmable logic controllers. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing stable 3.6 V reference independent of input ripple or load variation. Use Value: Maintains ADC accuracy over –40°C to +85°C ambient with <±0.5% total error due to tight Zener tolerance and low tempco. |
Use Scenario: Overvoltage clamp protecting 3.3 V microcontroller I/O pins from load-dump transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Fast-acting shunt protector absorbing transient energy above 3.6 V while limiting clamping voltage. Use Value: Survives 12 V/100 ms load-dump pulses per ISO 7637-2 due to 1260 mA surge rating and 130°C/W thermal resistance. |
| Medical Sensor Signal Conditioning | Aerospace Data Acquisition Module |
Use Scenario: Biasing low-noise op-amps in portable ECG front-end amplifiers requiring ultra-stable DC offsets. IC Role / Device Role / Timing Role: Low-drift voltage reference establishing common-mode level for differential signal paths. Use Value: Delivers <10 ppm/°C effective tempco and <10 nV/√Hz noise floor via hermetic glass construction and low ZZT. |
Use Scenario: Reference element in radiation-hardened telemetry subsystems monitoring spacecraft bus voltage. IC Role / Device Role / Timing Role: Primary voltage stabilization node in fault-tolerant power management ICs. Use Value: Operates continuously at +125°C ambient with no parameter shift due to radiation hardness and –65°C to +175°C rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4729A | Same electrical specs but DO-41 axial-leaded package; no surface-mount footprint compatibility | Used in through-hole prototyping or legacy board repairs; not suitable for automated SMT assembly | Select 1N4729AUR/TR when board space, thermal performance, or production scalability require SMT packaging |
| SMAJ4729A | Same Zener voltage and tolerance, but SMA package; higher thermal resistance (150°C/W vs. 130°C/W) and lower surge rating (1000 mA) | Preferred for cost-sensitive consumer electronics where moderate surge immunity suffices | Choose 1N4729AUR/TR for higher reliability, tighter thermal control, or MIL-PRF-19500 screening options |
Compared with 1N4729A and SMAJ4729A, the 1N4729AUR/TR offers superior thermal performance on FR4 PCBs, hermetic reliability for harsh environments, and direct compatibility with tape-and-reel SMT placement - making it optimal for industrial, automotive, and aerospace volume production.
Availability
1N4729AUR/TR is available at Aetrix Electronics and suitable for industrial power monitoring, automotive ECU protection, and medical sensor signal conditioning requiring stable component supply and full traceability.
Supply support for 1N4729AUR/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 analog, mixed-signal, and radiation-hardened components.
The 1N4729AUR/TR belongs to Microsemi's surface-mount Zener diode family designed for high-density, low-parasitic voltage regulation in mission-critical power and reference applications.
FAQ
What is the Zener voltage tolerance of the 1N4729AUR/TR?
The 1N4729AUR/TR has a nominal Zener voltage of 3.6 V with a tolerance of ±5%, as indicated by the "A" suffix in its part number. This tolerance is guaranteed at 30°C case temperature with 69 mA test current and applies across the full operating temperature range of –65°C to +175°C per the manufacturer's characterization.
Is the 1N4729AUR/TR RoHS compliant?
Yes, the 1N4729AUR/TR is RoHS compliant. The "e3" suffix in the full ordering designation (e.g., 1N4729AUR/TR-e3) specifies matte-tin plating per JEDEC J-STD-020 and compliance with EU Directive 2011/65/EU. Standard production units meet RoHS requirements unless otherwise specified.
What package type does the 1N4729AUR/TR use?
The 1N4729AUR/TR uses the DO-213AB glass MELF package - a cylindrical, leadless, hermetically sealed surface-mount outline. Its dimensions are 2.39–2.66 mm diameter and 4.80–5.20 mm length, optimized for reflow soldering and high-reliability mounting on FR4 PCBs.
Can the 1N4729AUR/TR replace through-hole 1N4729A in existing designs?
No direct replacement: the 1N4729AUR/TR uses DO-213AB MELF packaging, while the 1N4729A uses DO-41 axial leads. Footprint, thermal path, and assembly process differ significantly. Migration requires PCB redesign, thermal validation, and requalification - though electrical parameters remain identical.
What is the maximum surge current rating for the 1N4729AUR/TR?
The 1N4729AUR/TR has a maximum non-repetitive surge current (IS) of 1260 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25°C ambient. This rating enables robust transient suppression in automotive and industrial power interfaces without derating.
1N4729AUR/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):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 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)
1N4729AUR/TR FAQ
1.How can I place an order for 1N4729AUR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4729AUR/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 1N4729AUR/TR reliable?
The price and inventory of 1N4729AUR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4729AUR/TR is usually 5 days.
3.What payment methods are accepted for 1N4729AUR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4729AUR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4729AUR/TR?
1N4729AUR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4729AUR/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 1N4729AUR/TR?
For technical support, including 1N4729AUR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4729AUR/TR requirements.
6.How does Aetrix verify that 1N4729AUR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4729AUR/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 1N4729AUR/TR meets industry standards.
7.What is the process for return or replacement of 1N4729AUR/TR?
All 1N4729AUR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4729AUR/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 1N4729AUR/TR part is unused and in its original packaging.
Return procedure for 1N4729AUR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4729AUR/TR Tags
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Diodes Incorporated
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