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onsemi MZP4751ARLG
- Part No.:
- MZP4751ARLG
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
MZP4751ARLG.pdf
- Description:
- DIODE ZENER 30V 3W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,712
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Product details
Overview
MZP4751ARLG from onsemi is a 3 W axial-lead Zener diode with nominal zener voltage of 30 V ±5%, 8.5 Ω maximum zener impedance at 40 mA test current, and 0.25 μA maximum reverse leakage at 22.8 V. It operates from −65°C to +200°C and delivers stable voltage regulation in power supply feedback, overvoltage protection, and reference circuits.
For engineers reviewing the MZP4751ARLG datasheet, pinout, applications, or equivalent options, this part serves as a high-surge-capable (98 W @ 1 ms), ESD-hardened (Class 3, >16 kV HBM) Zener regulator in DO−41 (Case 59) packaging - critical for industrial power rails and automotive subsystems requiring robust transient immunity.
Technical Context
This device belongs to the MZP47xxA Series of silicon-oxide passivated Zener regulators, engineered for stable DC voltage reference under varying load and temperature conditions. Its Surmetic 30 construction ensures low leakage and tight voltage tolerance, while the axial-lead DO−41 package enables through-hole mounting with lead-to-ambient thermal resistance of ~30–40°C/W depending on PCB layout.
The MZP4751ARLG is characterized at 25°C with guaranteed limits on six electrical parameters including VZ, IZT, ZZT, IZK, ZZK, and IR. Its 3 W steady-state dissipation at TL = 75°C and 98 W non-repetitive surge rating support short-duration overvoltage clamping without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28.5 V min / 30 V nom / 31.5 V max @ IZT = 40 mA - defines regulated output range for precision reference use |
| Zener Impedance (ZZT) | 8.5 Ω max @ IZT = 40 mA - ensures minimal voltage shift under dynamic load changes |
| Reverse Leakage (IR) | 0.25 μA max @ VR = 22.8 V - guarantees low standby current in high-impedance bias networks |
| Surge Rating | 98 W @ 1 ms pulse - provides reliable transient suppression in input-stage protection circuits |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables direct handling and board-level integration without added ESD protection |
| Operating Temperature | −65°C to +200°C - supports deployment in under-hood automotive, industrial motor drives, and aerospace power systems |
Pinout & Package
Package: DO−41 (Case 59), axial-leaded plastic package with cathode indicated by polarity band. Dimensions: A = 4.10–5.20 mm (length), B = 2.00–2.70 mm (diameter), D = 0.71–0.86 mm (lead diameter), K = 25.40 mm (lead length).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal | Connected to higher-potential node; establishes regulated voltage at cathode relative to anode during reverse operation |
Key Features
| Feature | Design Value |
|---|---|
| Silicon-oxide passivated junction | Enables stable long-term VZ drift performance and low leakage across temperature extremes |
| Surmetic 30 construction | Delivers superior moisture resistance and mechanical reliability in humid or thermally cycling environments |
| Pb-free compliant packaging | Meets RoHS Directive 2011/65/EU without compromising thermal or electrical performance |
| Void-free transfer-molded case | Prevents internal delamination under thermal shock and ensures consistent heat transfer from junction to leads |
Applications
| Industrial Power Supply Feedback | Automotive Load Dump Protection |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or forward converter feedback loops. IC Role / Device Role / Timing Role: Zener reference element in optocoupler-based secondary-side feedback network. Use Value: Tight ±5% VZ tolerance and low ZZT ensure <±1% output regulation accuracy across line/load/temperature. |
Use Scenario: Clamping induced transients during alternator load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Primary overvoltage clamp in 12 V/24 V vehicle power distribution modules. Use Value: 98 W surge capability sustains 100 ms pulses up to 40 V without failure, meeting OEM stress requirements. |
| Programmable Reference Voltage Source | Overvoltage Detection Threshold |
|
Use Scenario: Setting precise trip points in adjustable voltage supervisors or analog comparators. IC Role / Device Role / Timing Role: Stable DC reference for LM393/LM339 comparator inputs in battery management systems. Use Value: Low 0.25 μA leakage at 22.8 V prevents false triggering in high-impedance threshold networks. |
Use Scenario: Detecting overvoltage faults in DC-DC converter outputs before downstream IC damage occurs. IC Role / Device Role / Timing Role: Input to discrete transistor switch or dedicated OVP IC enabling fast shutdown response. Use Value: Fast turn-on at 30 V nominal allows detection within 100 ns of overvoltage onset, minimizing energy exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4751A | Same 30 V nominal VZ, but rated at 1 W (not 3 W); ZZT = 10 Ω @ 40 mA vs. 8.5 Ω | Not suitable for sustained >1 W dissipation or 98 W surge events; limited to low-power references | Select MZP4751ARLG when >1 W continuous or high-energy transient clamping is required. |
| BZX85C30 | 30 V nominal VZ, 1.3 W rating, ZZT = 35 Ω @ 20 mA; no Class 3 ESD rating specified | Lacks surge and ESD robustness; intended for general-purpose biasing, not protection-critical roles | Choose MZP4751ARLG where ESD immunity (>16 kV HBM) and 98 W surge margin are mandatory. |
Compared with 1N4751A and BZX85C30, the MZP4751ARLG offers higher power handling, lower dynamic impedance, and certified ESD/surge resilience - making it the only option among the three qualified for automotive-grade transient suppression and industrial power rail stabilization.
Availability
MZP4751ARLG is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronics, and programmable reference circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MZP4751ARLG 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MZP4751ARLG belongs to the MZP47xxA Series of high-reliability Zener regulators designed specifically for demanding power management and protection functions in harsh-environment systems.
FAQ
What is the maximum steady-state power dissipation for MZP4751ARLG at 75°C lead temperature?
The MZP4751ARLG has a maximum steady-state power dissipation of 3 W at a lead temperature (TL) of 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 24 mW/°C - meaning at 100°C TL, its usable power drops to 2.4 W. This rating is critical for thermal design in enclosed or high-ambient environments where heatsinking is limited.
Does MZP4751ARLG have a Pb-free option and what is its orderable part number?
Yes, MZP4751ARLG is offered in a Pb-free package compliant with RoHS Directive 2011/65/EU. The official Pb-free orderable part number is MZP4751ARLGT3G, as confirmed by onsemi's website and product change notices. Both standard and Pb-free versions share identical electrical and thermal specifications.
What is the zener impedance of MZP4751ARLG and why does it matter in regulation circuits?
The MZP4751ARLG has a maximum zener impedance (ZZT) of 8.5 Ω at IZT = 40 mA. This low dynamic resistance minimizes output voltage variation under changing load current - essential for maintaining tight regulation in feedback paths and reference nodes where even small ΔIZ must produce minimal ΔVZ.
How is polarity identified on the MZP4751ARLG package?
The MZP4751ARLG uses a cathode band (a single dark stripe) on the body to indicate the cathode terminal. When installed, the banded end connects to the higher-potential node in reverse-bias operation. The anode is the unmarked lead. Polarity orientation is critical - reverse connection will result in forward conduction (~1.5 V drop) instead of Zener regulation.
Can MZP4751ARLG be used in surface-mount designs?
No, MZP4751ARLG is exclusively an axial-leaded DO−41 (Case 59) through-hole device and is not compatible with SMT assembly. For surface-mount equivalents, consider onsemi's NSZ series (e.g., NSZ30V2T5G), which offer comparable 30 V Zener characteristics in SOD-123 packages - but with different power ratings and thermal behavior.
MZP4751ARLG 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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 22.8 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
MZP4751ARLG FAQ
1.How can I place an order for MZP4751ARLG through Aetrix?
Please submit a Request for Quotation (RFQ) for MZP4751ARLG 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 MZP4751ARLG reliable?
The price and inventory of MZP4751ARLG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MZP4751ARLG is usually 5 days.
3.What payment methods are accepted for MZP4751ARLG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MZP4751ARLG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MZP4751ARLG?
MZP4751ARLG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MZP4751ARLG 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 MZP4751ARLG?
For technical support, including MZP4751ARLG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MZP4751ARLG requirements.
6.How does Aetrix verify that MZP4751ARLG is sourced from the original manufacturer or authorized distributors?
All MZP4751ARLG 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 MZP4751ARLG meets industry standards.
7.What is the process for return or replacement of MZP4751ARLG?
All MZP4751ARLG units undergo pre-shipment inspection (PSI). If there is an issue with MZP4751ARLG, 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 MZP4751ARLG part is unused and in its original packaging.
Return procedure for MZP4751ARLG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MZP4751ARLG Tags
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