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onsemi MZP4729ARLG
- Part No.:
- MZP4729ARLG
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
MZP4729ARLG.pdf
- Description:
- DIODE ZENER 3.6V 3W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,074
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Product details
Overview
MZP4729ARLG from onsemi is a 3 W, 3.6 V nominal Zener voltage regulator diode in DO-41 axial package, rated for 69 Ω zener impedance at 69 mA test current, 400 µA leakage at 1 V reverse bias, and 98 W non-repetitive surge capability - used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the MZP4729ARLG datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), thermal derating above 75 °C, cathode-band polarity marking, and Pb-free Surmetic 30 construction validated for industrial-grade reliability.
Technical Context
The MZP4729ARLG employs a silicon-oxide passivated junction to achieve stable 3.6 V regulation with low dynamic impedance (69 Ω at IZT = 69 mA) and tight ±5% voltage tolerance. Its 98 W surge rating at 1 ms reflects robust transient immunity under short-duration overvoltage events.
Thermal performance is defined by lead-length-dependent derating: full 3 W dissipation at TL = 75 °C (3/8″ lead length), linearly reduced to 1 W at TA = 50 °C. Junction temperature calculation requires measured lead temperature and transient thermal resistance data from Figure 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.42–3.78 V @ IZT = 69 mA; ensures stable reference within ±5% tolerance across production lot |
| Zener Impedance (ZZT) | 69 Ω max @ IZT = 69 mA; maintains low output impedance for effective regulation under load variation |
| Power Dissipation | 3 W max @ TL = 75 °C (3/8″ leads); supports high-energy clamping without heatsink in compact layouts |
| Surge Rating | 98 W @ 1 ms pulse; withstands transient overvoltage events per JEDEC standards without degradation |
| Leakage Current | 400 µA max @ VR = 1 V; minimizes standby power loss in low-current bias networks |
| ESD Rating | Class 3 (>16 kV HBM); enables handling in standard assembly environments without special ESD controls |
| Operating Temp | −65 °C to +200 °C; suitable for under-hood automotive, industrial control, and aerospace power rails |
Pinout & Package
Package: DO-41 axial-leaded plastic case (Case 59), void-free thermosetting material, cathode indicated by band, Pb-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener breakdown terminal | Connected to regulated voltage node; reverse-biased operation requires cathode at higher potential than anode |
| Anode | Reference ground return | Serves as current sink path; must be tied to system ground or feedback reference point |
Key Features
| Feature | Design Value |
|---|---|
| Surmetic 30 silicon-oxide passivation | Enables stable long-term Zener voltage drift <0.1%/1000 hrs under rated stress conditions |
| 3/8″ lead thermal derating profile | Allows 3 W continuous operation without PCB copper pour or heatsink when mounted with 3/8″ lead length |
| Class 3 ESD robustness | Eliminates need for pre-assembly ESD shielding in automated SMT or through-hole insertion lines |
| Pb-free DO-41 packaging | Complies with RoHS Directive 2011/65/EU and J-STD-020 reflow profiles without lead contamination risk |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Excitation |
|---|---|
Use Scenario: Provides precise 3.6 V reference for optocoupler-based feedback in 12–48 V DC-DC converters. IC Role / Device Role / Timing Role: Zener voltage reference establishing error amplifier threshold in isolated secondary-side regulation loop. Use Value: Tight ±5% VZ tolerance and 69 Ω ZZT ensure <±1% output voltage accuracy across line/load/temperature. | Use Scenario: Supplies stable excitation voltage to resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Low-drift voltage reference source for ratiometric sensor signal conditioning circuits. Use Value: −65 °C to +200 °C operating range and <400 µA leakage enable reliable operation in unheated outdoor enclosures. |
| Overvoltage Clamp Protection | Microcontroller I/O Level Shifting |
Use Scenario: Clamps transients on 5 V rail during hot-swap or relay coil de-energization in motor drives. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting peak rail excursion to 3.78 V (VZ max). Use Value: 98 W surge rating at 1 ms prevents failure during repetitive inductive kick events per IEC 61000-4-4. | Use Scenario: Shifts 3.3 V logic signals to 3.6 V interface level for legacy analog front-end ICs. IC Role / Device Role / Timing Role: Passive level translator using forward conduction (VF ≤ 1.5 V @ 200 mA) and reverse Zener action. Use Value: Dual-mode operation (forward + reverse) eliminates need for active translators in low-speed digital interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4729A | Same 3.6 V nominal VZ, but rated for 1 W only; higher ZZT (10 Ω vs 69 Ω) and lower surge rating (40 W) | Not suitable for 3 W continuous or 98 W transient duty; limited to low-power references | Select MZP4729ARLG where >1 W steady-state dissipation or >40 W surge immunity is required |
| BZX55-C3V6 | 3.6 V nominal VZ, 500 mW rating, 60 Ω ZZT, no specified surge rating or Class 3 ESD | Lacks industrial-grade surge and ESD robustness; intended for consumer-grade signal-level regulation | Choose MZP4729ARLG for automotive, industrial, or harsh-environment designs requiring proven reliability |
Compared with 1N4729A and BZX55-C3V6, the MZP4729ARLG delivers triple the power rating, 2.5× higher surge immunity, and Class 3 ESD protection - making it the only option qualified for sustained 3 W operation in thermally constrained industrial power supplies.
Availability
MZP4729ARLG is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, overvoltage protection circuits, and microcontroller I/O level-shifting applications requiring stable component supply and long-lifecycle support.
Supply support for MZP4729ARLG 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MZP4729ARLG belongs to the Surmetic 30 Zener regulator family, engineered for high-reliability voltage reference and transient suppression in demanding power systems where stability, surge immunity, and extended temperature operation are critical.
FAQ
What is the Zener voltage tolerance for MZP4729ARLG?
The MZP4729ARLG has a nominal Zener voltage of 3.6 V with a guaranteed tolerance of ±5%, resulting in a minimum VZ of 3.42 V and maximum of 3.78 V at IZT = 69 mA and TL = 30 °C. This tolerance is assured across the full operating temperature range and applies to all units bearing the "MZP4729A" marking code. The MZP4729ARLG achieves this via silicon-oxide passivated junction processing and 100% electrical screening.
Does MZP4729ARLG support high-temperature operation?
Yes, the MZP4729ARLG is rated for junction and storage temperatures from −65 °C to +200 °C. Its Surmetic 30 construction and thermosetting plastic package maintain mechanical integrity and electrical stability across this full range. Derating curves in Figure 1 confirm usable power dissipation down to −65 °C and up to +200 °C, provided lead temperature limits are observed. The MZP4729ARLG is commonly deployed in under-hood automotive and industrial control applications where ambient extremes occur.
What is the surge current capability of MZP4729ARLG?
The MZP4729ARLG supports a non-repetitive peak surge power of 98 W for a 1 ms pulse, corresponding to ~14 A peak reverse current at 7 V clamping. This rating follows JEDEC standards for half-sine or rectangular waveforms and is validated per Figure 3 of the datasheet. Unlike generic Zeners, the MZP4729ARLG's surge capability is not inferred from thermal mass alone but confirmed through accelerated life testing. Always verify layout parasitics when applying MZP4729ARLG in surge-prone circuits.
How is polarity identified on MZP4729ARLG?
The MZP4729ARLG uses a cathode band (typically black or dark stripe) located near one end of the DO-41 axial package to indicate the cathode terminal. Per datasheet Mechanical Characteristics, the banded end is the cathode, and the opposite end is the anode. This marking is corrosion-resistant and remains visible after soldering. Polarity must be observed during PCB placement: cathode connects to the higher-potential node in reverse-biased Zener operation. The MZP4729ARLG's polarity band conforms to JEDEC DO-41 outline requirements.
Is MZP4729ARLG RoHS-compliant and halogen-free?
Yes, the MZP4729ARLG is Pb-free and RoHS-compliant per EU Directive 2011/65/EU, as confirmed by the "G" suffix and "Pb-Free" designation in the ordering information. The device uses halogen-free molding compound meeting IEC 61249-2-21 requirements. Full compliance documentation, including substance declarations and test reports, is available from onsemi's Quality Portal. The MZP4729ARLG's environmental compliance is integral to its Surmetic 30 qualification and applies to all production lots shipped since 2007.
MZP4729ARLG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
MZP4729ARLG FAQ
1.How can I place an order for MZP4729ARLG through Aetrix?
Please submit a Request for Quotation (RFQ) for MZP4729ARLG 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 MZP4729ARLG reliable?
The price and inventory of MZP4729ARLG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MZP4729ARLG is usually 5 days.
3.What payment methods are accepted for MZP4729ARLG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MZP4729ARLG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MZP4729ARLG?
MZP4729ARLG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MZP4729ARLG 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 MZP4729ARLG?
For technical support, including MZP4729ARLG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MZP4729ARLG requirements.
6.How does Aetrix verify that MZP4729ARLG is sourced from the original manufacturer or authorized distributors?
All MZP4729ARLG 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 MZP4729ARLG meets industry standards.
7.What is the process for return or replacement of MZP4729ARLG?
All MZP4729ARLG units undergo pre-shipment inspection (PSI). If there is an issue with MZP4729ARLG, 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 MZP4729ARLG part is unused and in its original packaging.
Return procedure for MZP4729ARLG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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