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onsemi MZP4746ARLG
- Part No.:
- MZP4746ARLG
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
MZP4746ARLG.pdf
- Description:
- DIODE ZENER 18V 1W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,363
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Product details
Overview
MZP4746ARLG from onsemi is a 3 W, 18 V ±5% Zener voltage regulator diode in DO-41 axial package, with 14 Ω max zener impedance at 20 mA test current, 0.25 μA max leakage at 13.7 V, and 98 W surge rating for 1 ms pulses - used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the MZP4746ARLG datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating above 75°C, surge current capability, lead temperature limits during soldering, and Pb-free compliance per JEDEC standards.
Technical Context
This device operates as a reverse-biased silicon Zener diode with oxide-passivated junction, delivering stable regulation across −65°C to +200°C junction temperature range. Its 3 W steady-state dissipation at TL = 75°C and 1 W at TA = 50°C reflects thermal design constraints tied to lead length (3/8″ standard) and mounting method.
Zener voltage is guaranteed at 90 s with lead temperature held at 30°C ±1°C, 3/8″ from body; impedance values (ZZT = 14 Ω @ IZT = 20 mA, ZZK = 750 Ω @ IZK = 0.25 mA) are derived per JEDEC AC superposition methodology, not DC measurement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9 V @ IZT = 20 mA - defines regulated output voltage window under nominal bias |
| Zener Impedance (ZZT) | 14 Ω max @ IZT = 20 mA - determines regulation accuracy under load transients |
| Leakage Current (IR) | 0.25 μA max @ VR = 13.7 V - ensures minimal error current in high-impedance reference paths |
| Surge Power Rating | 98 W @ 1 ms pulse - supports transient overvoltage clamping without degradation |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling in automated assembly environments |
| Package | DO-41 (Case 59), axial lead, Pb-free - compatible with legacy through-hole PCB layouts and wave soldering |
Pinout & Package
DO-41 plastic axial package (Case 59), void-free thermosetting material, cathode indicated by band. Lead temperature limit: 260°C for 10 s at 1/16″ from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-bias anode connection point | Connected to higher-potential node in shunt regulator configuration; carries full zener current |
| Anode | Reverse-bias cathode connection point | Connected to circuit ground or lower-potential reference; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Silicon-oxide passivated junction | Enables stable long-term voltage drift and low noise performance in industrial environments |
| Surge rating of 98 W @ 1 ms | Provides immunity to short-duration line transients without parameter shift or failure |
| Pb-free construction (RoHS compliant) | Meets global environmental regulations without requiring process changes in SMT/reflow lines |
| Package size ≤ conventional 1 W Zener | Allows drop-in replacement in space-constrained designs without board rework |
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. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 18 V threshold for TL431-type controller biasing. Use Value: Tight ±5% VZ tolerance and low 14 Ω impedance ensure <±1% output regulation across line/load variations. | Use Scenario: Provides stable excitation voltage for bridge-based pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Precision analog reference source with minimal self-heating effect due to 3 W power headroom. Use Value: 0.25 μA leakage at 13.7 V prevents loading errors in high-impedance Wheatstone bridge arms. |
| Overvoltage Clamp for MCU I/O | Automotive Body Control Module Protection |
Use Scenario: Placed across microcontroller GPIO pins to suppress ESD and inductive spikes from relay coils. IC Role / Device Role / Timing Role: Transient voltage suppression element rated for >16 kV HBM and 98 W surge pulses. Use Value: Class 3 ESD rating and fast response enable direct pin-level protection without external TVS diodes. | Use Scenario: Integrated into LIN bus interface circuitry to clamp load-dump transients up to 35 V. IC Role / Device Role / Timing Role: Secondary overvoltage limiter backing up primary TVS, operating within −40°C to +125°C ambient. Use Value: Extended −65°C to +200°C junction temperature range ensures reliability under 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 18 V nominal VZ, ±5% tolerance, but rated at 1 W (not 3 W); DO-41 package, non-Pb-free | Limited to low-power reference use; cannot sustain same continuous or surge power levels | Select only when thermal budget restricts dissipation to ≤1 W and RoHS exemption applies |
| MMSZ4706T1G | Surface-mount SOD-123 package, same 18 V VZ, but rated 500 mW; lower surge capability (50 W @ 1 ms) | Requires PCB redesign for SMT; unsuitable for high-energy transient environments | Choose for space-constrained consumer electronics where board area is critical and surge stress is low |
Compared with MZP4746ARLG, the 1N4746A offers identical voltage but lacks 3 W power handling and Pb-free compliance, while MMSZ4706T1G trades package compatibility and surge resilience for miniaturization - making MZP4746ARLG optimal for industrial power regulation where robustness and through-hole compatibility are required.
Availability
MZP4746ARLG is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive body control modules, and overvoltage protection circuits requiring stable component supply with full traceability and long-lifecycle support.
Supply support for MZP4746ARLG 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, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The MZP4746ARLG belongs to the MZP47xxA Series of 3 W Zener regulators designed specifically for high-reliability voltage reference and transient suppression in harsh-environment power systems.
FAQ
What is the nominal Zener voltage and tolerance of the MZP4746ARLG?
The MZP4746ARLG has a nominal Zener voltage of 18 V with a tolerance of ±5%, meaning its guaranteed operating range is 17.1 V to 18.9 V when measured at IZT = 20 mA and lead temperature maintained at 30°C ±1°C, 3/8″ from the diode body. This tight tolerance ensures predictable regulation in precision feedback and reference applications. The MZP4746ARLG achieves this via oxide-passivated silicon junction technology.
How does the MZP4746ARLG handle surge conditions?
The MZP4746ARLG supports a non-repetitive peak surge power of 98 W for 1 ms pulses, per JEDEC standards, enabling reliable clamping of transient overvoltages such as inductive kickback or ESD events. Its surge capability exceeds that of standard 1 W Zeners like the 1N4746A. The MZP4746ARLG maintains parameter integrity after such events when operated within its specified thermal limits and lead-length guidelines.
Is the MZP4746ARLG RoHS compliant and what does the 'G' suffix indicate?
Yes, the MZP4746ARLG is Pb-free and RoHS compliant; the 'G' suffix in its part number explicitly denotes the Pb-free package per onsemi's standard marking convention. It meets J-STD-609 Category 1 requirements and is compatible with standard lead-free soldering profiles, including peak temperatures up to 260°C for 10 seconds at 1/16″ from the case. The MZP4746ARLG documentation confirms full compliance with EU RoHS Directive 2011/65/EU.
What is the maximum steady-state power dissipation for the MZP4746ARLG and how does it derate with temperature?
The MZP4746ARLG delivers 3 W maximum steady-state power dissipation at lead temperature (TL) = 75°C with 3/8″ lead length; it derates linearly at 24 mW/°C above that point. At ambient temperature (TA) = 50°C, its rating drops to 1 W, derating at 6.67 mW/°C beyond. These dual derating curves reflect distinct thermal paths - lead-to-ambient versus junction-to-lead - and must both be considered in layout. The MZP4746ARLG datasheet provides Figure 1 for visual derating guidance.
Can the MZP4746ARLG replace a 1N4746A in existing designs?
The MZP4746ARLG can serve as a functional upgrade to the 1N4746A in most through-hole applications due to identical DO-41 packaging, polarity marking, and 18 V Zener voltage, but it provides triple the power rating (3 W vs. 1 W) and Pb-free compliance. However, because its thermal mass and surge capability differ, designers must verify board-level heat sinking and transient stress margins. The MZP4746ARLG is not a drop-in replacement without validation of thermal performance under worst-case load conditions.
MZP4746ARLG 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):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 13.7 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
MZP4746ARLG FAQ
1.How can I place an order for MZP4746ARLG through Aetrix?
Please submit a Request for Quotation (RFQ) for MZP4746ARLG 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 MZP4746ARLG reliable?
The price and inventory of MZP4746ARLG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MZP4746ARLG is usually 5 days.
3.What payment methods are accepted for MZP4746ARLG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MZP4746ARLG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MZP4746ARLG?
MZP4746ARLG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MZP4746ARLG 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 MZP4746ARLG?
For technical support, including MZP4746ARLG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MZP4746ARLG requirements.
6.How does Aetrix verify that MZP4746ARLG is sourced from the original manufacturer or authorized distributors?
All MZP4746ARLG 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 MZP4746ARLG meets industry standards.
7.What is the process for return or replacement of MZP4746ARLG?
All MZP4746ARLG units undergo pre-shipment inspection (PSI). If there is an issue with MZP4746ARLG, 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 MZP4746ARLG part is unused and in its original packaging.
Return procedure for MZP4746ARLG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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