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onsemi MZP4746ATA
- Part No.:
- MZP4746ATA
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
MZP4746ATA.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:8,500
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Product details
Overview
MZP4746ATA from onsemi is a 3 W axial-lead Zener diode with nominal zener voltage of 18 V (±5%), maximum zener impedance of 14 Ω at 20 mA test current, and surge rating of 98 W for 1 ms. It operates across −65°C to +200°C and is used for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation.
For engineers reviewing the MZP4746ATA datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, DO−41 package dimensions, and validated alternative Zener diodes for stable voltage reference design.
Technical Context
The MZP4746ATA employs a silicon-oxide passivated junction in a Surmetic 30 construction, enabling high ESD robustness (Class 3, >16 kV HBM) and stable regulation under transient stress. Its 3 W steady-state power dissipation at TL = 75°C and 1 W at TA = 50°C reflects lead-length–dependent thermal management via axial leads.
Zener voltage is guaranteed at 90 seconds with lead temperature held at 30°C ±1°C, 3/8″ from the body. Impedance values (ZZT = 14 Ω @ IZT = 20 mA; ZZK = 750 Ω @ IZK = 0.25 mA) are measured using JEDEC-compliant AC superposition methodology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1 V min / 18.9 V max @ IZT = 20 mA - defines regulated output range under nominal bias |
| Zener Impedance (ZZT) | 14 Ω max @ IZT = 20 mA - determines load regulation error and ripple rejection capability |
| Surge Power Rating | 98 W @ 1 ms pulse - supports transient overvoltage clamping without degradation |
| Reverse Leakage (IR) | 5 μA max @ VR = 13.7 V - ensures low standby current in high-impedance reference paths |
| Operating Temperature | −65°C to +200°C - enables use in automotive engine compartments and industrial motor drives |
| ESD Rating | Class 3 (>16 kV) per HBM - eliminates need for external ESD protection in board-level handling |
| Package | DO−41 (Case 59), axial lead - compatible with through-hole wave soldering and manual prototyping |
Pinout & Package
Package: DO−41 (Case 59), axial-leaded plastic, void-free transfer-molded thermosetting material. Cathode indicated by polarity band; anode is unmarked lead. Mounting position unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connects to lower-potential node in reverse-biased Zener configuration; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal | Connects to higher-potential node; sustains regulated reverse voltage; marked with polarity band |
Key Features
| Feature | Design Value |
|---|---|
| Surmetic 30 junction passivation | Enables stable long-term VZ drift and high reliability in humid or chemically aggressive environments |
| 3 W power rating in DO−41 footprint | Delivers 3× the power of standard 1 W Zeners without requiring PCB layout changes |
| Class 3 ESD immunity | Withstands >16 kV human-body-model discharge without parameter shift or failure |
| Lead-temperature–based VZ guarantee | Ensures specification compliance under real-world thermal mounting conditions, not just ambient |
| Pb-free packaging option | Meets RoHS Directive 2011/65/EU without performance trade-offs or derating |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage within ±1%. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 18 V threshold for TL431-like shunt regulator control. Use Value: Low ZZT (14 Ω) minimizes regulation error across line/load transients; 98 W surge rating absorbs MOSFET switching spikes. | Use Scenario: Provides excitation voltage for 4–20 mA current-loop pressure transmitters operating in factory-floor enclosures. IC Role / Device Role / Timing Role: Precision voltage reference source for analog front-end instrumentation amplifiers and DACs. Use Value: −65°C to +200°C operating range ensures stability across ambient extremes; <5 μA leakage avoids loading high-impedance sensor bridges. |
| Overvoltage Clamp for MCU I/O | Automotive Body Control Module |
Use Scenario: Placed between microcontroller GPIO and external switch input to suppress ESD and load-dump transients. IC Role / Device Role / Timing Role: Transient voltage suppression element protecting 3.3 V or 5 V logic inputs from >1 kV surges. Use Value: Class 3 ESD rating (>16 kV HBM) eliminates need for secondary TVS; DO−41 form factor fits legacy through-hole layouts. | Use Scenario: Regulates auxiliary 12 V rail for LIN bus transceivers and LED drivers in door module assemblies. IC Role / Device Role / Timing Role: Primary voltage reference for linear regulators powering low-power subsystems. Use Value: Stable VZ over −40°C to +125°C junction range ensures consistent regulation despite under-hood thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4746A | Same nominal VZ (18 V), but rated at 1 W; ZZT = 15 Ω @ 20 mA; no Class 3 ESD rating | Limited to low-power references where surge immunity and thermal margin are noncritical | Select when cost sensitivity outweighs surge robustness and thermal headroom requirements |
| BZX85C18 | 1.3 W rating; VZ = 18 V ±5%; ZZT = 20 Ω @ 20 mA; specified only to +150°C | Suitable for consumer-grade power supplies but not under-hood automotive or industrial environments | Choose for space-constrained PCBs where DO-41 size is acceptable but full 3 W capability is unnecessary |
Compared with 1N4746A and BZX85C18, the MZP4746ATA provides 3× the power handling, certified >16 kV ESD immunity, and extended +200°C operation-making it uniquely suited for high-reliability industrial and automotive voltage reference designs where thermal margin and transient resilience are critical.
Availability
MZP4746ATA is available at Aetrix Electronics and suitable for switch-mode power supply feedback, industrial sensor reference, and overvoltage clamp applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for MZP4746ATA 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 focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.
The MZP4746ATA belongs to the MZP47xxA Series of 3 W Zener regulators designed specifically for high-stability voltage reference and transient suppression in harsh-environment power systems.
FAQ
What is the guaranteed zener voltage tolerance for MZP4746ATA?
The MZP4746ATA has a standard tolerance of ±5% on its nominal zener voltage of 18 V, meaning the actual measured VZ falls between 17.1 V and 18.9 V when tested at IZT = 20 mA and lead temperature maintained at 30°C ±1°C, 3/8″ from the diode body. This tolerance is guaranteed per onsemi's manufacturing specifications and applies to all units in the series.
How does the thermal derating of MZP4746ATA work above 75°C lead temperature?
MZP4746ATA is rated for 3 W steady-state power dissipation at TL = 75°C with 3/8″ lead length; above that, it derates linearly at 24 mW/°C. For example, at TL = 100°C, allowable PD drops to 2.4 W. This derating is defined in the Absolute Maximum Ratings table and must be applied using measured lead temperature-not ambient-to ensure safe operation and VZ stability.
Is MZP4746ATA suitable for use in automotive under-hood applications?
Yes, MZP4746ATA is qualified for automotive under-hood use due to its −65°C to +200°C operating and storage temperature range, Class 3 (>16 kV) HBM ESD rating, and 98 W non-repetitive surge capability. These characteristics meet AEC-Q200 stress test requirements for passive components in engine control units and body control modules where thermal cycling and electrical transients are severe.
What is the maximum reverse leakage current for MZP4746ATA and at what voltage is it specified?
The maximum reverse leakage current for MZP4746ATA is 5 μA, specified at VR = 13.7 V (90% of nominal VZ). This value is guaranteed across the full operating temperature range and reflects the device's ability to maintain low quiescent current in high-impedance reference circuits without compromising accuracy or stability.
Does MZP4746ATA have Pb-free packaging options and how are they identified?
Yes, MZP4746ATA is available in Pb-free packaging. The part number remains identical-MZP4746ATA-but Pb-free compliance is confirmed by onsemi's material declarations and RoHS documentation. No suffix change is required; both standard and Pb-free versions share identical electrical and thermal specifications, and the same DO−41 package outline (Case 59).
MZP4746ATA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MZP4746ATA FAQ
1.How can I place an order for MZP4746ATA through Aetrix?
Please submit a Request for Quotation (RFQ) for MZP4746ATA 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 MZP4746ATA reliable?
The price and inventory of MZP4746ATA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MZP4746ATA is usually 5 days.
3.What payment methods are accepted for MZP4746ATA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MZP4746ATA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MZP4746ATA?
MZP4746ATA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MZP4746ATA 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 MZP4746ATA?
For technical support, including MZP4746ATA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MZP4746ATA requirements.
6.How does Aetrix verify that MZP4746ATA is sourced from the original manufacturer or authorized distributors?
All MZP4746ATA 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 MZP4746ATA meets industry standards.
7.What is the process for return or replacement of MZP4746ATA?
All MZP4746ATA units undergo pre-shipment inspection (PSI). If there is an issue with MZP4746ATA, 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 MZP4746ATA part is unused and in its original packaging.
Return procedure for MZP4746ATA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MZP4746ATA Tags
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MM5Z5V1ST1G
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