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onsemi MZP4749ATAG
- Part No.:
- MZP4749ATAG
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
MZP4749ATAG.pdf
- Description:
- DIODE ZENER 24V 1W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,556
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Product details
Overview
MZP4749ATAG from onsemi is a 3 W, 24 V ±5% axial-lead Zener diode in DO-41 (Case 59) package, rated for 10.5 Ω Zener impedance at 25 mA test current, 190 µA leakage at 18.2 V, and 98 W non-repetitive surge capability; used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the MZP4749ATAG datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating above 75°C, surge current rating, lead temperature limits during soldering, and Pb-free compliance per JEDEC standards.
Technical Context
This device operates as a silicon-oxide passivated junction Zener regulator with guaranteed maximum limits on six electrical parameters including VZ, IZT, ZZT, IZK, ZZK, and IR. Its 3 W steady-state power dissipation at TL = 75°C enables stable regulation under moderate load transients.
The DO-41 package supports axial mounting in any orientation, features corrosion-resistant surfaces and readily solderable leads, and maintains full specification compliance up to +200°C junction temperature while meeting Class 3 ESD rating (>16 kV HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8–25.2 V @ IZT = 25 mA; ensures ±5% tolerance for stable reference generation |
| Zener Impedance (ZZT) | 10.5 Ω max @ IZT = 25 mA; low dynamic resistance improves regulation accuracy under varying load |
| Leakage Current (IR) | 190 µA max @ VR = 18.2 V; minimizes standby power loss in high-impedance bias networks |
| Surge Rating | 98 W @ 1 ms pulse; withstands transient overvoltage events without degradation |
| Power Dissipation | 3 W @ TL = 75°C, derated 24 mW/°C above; defines safe continuous operating envelope with standard lead length |
| ESD Rating | Class 3 (>16 kV) per HBM; provides robust handling immunity during assembly and field operation |
Pinout & Package
DO-41 (Case 59) axial-lead plastic package with cathode indicated by polarity band; void-free thermosetting plastic case, corrosion-resistant finish, and solderable leads rated for 260°C at 1/16″ from case for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener breakdown terminal | Reverse-biased connection point where regulated voltage appears relative to anode |
| Anode | Reference ground node | Common return path for Zener current; establishes reference potential for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Silicon-oxide passivated junction | Enables stable long-term Zener voltage drift performance and low noise regulation |
| Pb-free Surmetic 30 construction | Complies with RoHS and JEDEC lead-free soldering requirements without compromising surge robustness |
| Package size ≤ conventional 1 W DO-41 | Allows drop-in replacement in legacy 1 W footprint designs while delivering 3× power capability |
| Guaranteed six-parameter limits | Reduces qualification overhead by eliminating need for incoming lot testing of critical Zener parameters |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 24 V reference for linear regulator feedback or ADC reference buffer in industrial power modules. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference with tight ±5% tolerance and low 10.5 Ω dynamic impedance. Use Value: Maintains output regulation accuracy within ±0.5% over 25 mA load variation due to low ZZT and minimal temperature coefficient drift. | Use Scenario: Clamping transient surges on 24 V DC bus lines in PLC I/O modules exposed to inductive switching noise. IC Role / Device Role / Timing Role: Shunt protector absorbing 98 W non-repetitive pulses without failure, triggered when bus exceeds 25.2 V. Use Value: Prevents downstream IC damage by limiting peak voltage to ≤25.2 V during 1 ms transients, validated per JEDEC surge standards. |
| Temperature-Stable Bias Network | Low-Power Sensor Excitation |
Use Scenario: Generating bias voltage for op-amp input stages in analog signal conditioning circuits operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Precision Zener reference with known temperature coefficient (≈+5.5 mV/°C for 24 V units) enabling compensated design. Use Value: Enables predictable VZ drift modeling using Figure 6 data, reducing calibration burden in wide-temperature applications. | Use Scenario: Supplying excitation voltage to resistive bridge sensors (e.g., strain gauges) in battery-powered handheld instrumentation. IC Role / Device Role / Timing Role: Low-leakage (190 µA max) Zener source delivering stable 24 V with minimal quiescent current draw. Use Value: Extends battery life by limiting reference current to <200 µA at 18.2 V reverse bias, critical for µA-level system sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | Same 24 V ±5% Zener voltage, but rated for 1 W only; higher ZZT (12 Ω) and lower surge rating (40 W) | Not suitable for 3 W continuous or 98 W surge conditions; limited to low-power reference use | Select MZP4749ATAG when >1 W steady-state dissipation or high-surge immunity is required |
| MMSZ4708T1G | SMD SOD-123 package, same 24 V rating, but 500 mW power limit and 100 µA leakage at 18.2 V | Designed for space-constrained PCB layouts; lacks axial-lead mechanical robustness and surge margin | Choose MZP4749ATAG for through-hole mounting, high-reliability industrial environments, or legacy DO-41 compatibility |
Compared with 1N4749A and MMSZ4708T1G, the MZP4749ATAG delivers triple the power rating, superior surge immunity, and axial-lead mechanical stability-making it optimal for industrial power rails where thermal margin and transient resilience are critical.
Availability
MZP4749ATAG is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controller (PLC) I/O protection, and sensor excitation circuits requiring stable component supply with full Pb-free compliance and JEDEC-qualified surge performance.
Supply support for MZP4749ATAG 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 manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MZP4749ATAG belongs to the MZP47xxA Series of 3 W Zener regulators designed specifically for high-reliability industrial voltage reference and overvoltage protection where robust surge handling and tight parametric guarantees are mandatory.
FAQ
What is the Zener voltage tolerance for MZP4749ATAG?
The MZP4749ATAG has a nominal Zener voltage of 24 V with a guaranteed tolerance of ±5%, meaning the actual measured VZ falls between 22.8 V and 25.2 V when tested at IZT = 25 mA and TL = 30°C ±1°C. This tolerance is standardized across all devices in the MZP47xxA series and is verified during production screening per the datasheet's electrical characteristics table.
Can MZP4749ATAG replace a 1N4749A in existing designs?
Yes, MZP4749ATAG can replace 1N4749A in most cases due to identical Zener voltage (24 V ±5%), same DO-41 package, and matching polarity marking-but only if the design does not exceed 1 W power dissipation. The MZP4749ATAG supports 3 W continuous operation and 98 W surge, whereas 1N4749A is limited to 1 W and 40 W surge. Thermal layout must be reviewed for higher power handling.
What is the maximum allowable lead temperature during soldering for MZP4749ATAG?
The maximum lead temperature for soldering MZP4749ATAG is 260°C, applied at a distance of 1/16 inch from the case for no longer than 10 seconds. This limit ensures integrity of the silicon-oxide passivated junction and thermosetting plastic encapsulation. Exceeding this condition risks delamination, parameter shift, or latent reliability failure.
Does MZP4749ATAG meet RoHS and Pb-free requirements?
Yes, MZP4749ATAG is a Pb-free device compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level (MSL) standards. The "T" in the part number denotes tape-and-reel packaging, and "AG" suffix confirms Pb-free construction per onsemi's documented Surmetic 30 process and packaging specifications.
How is the Zener impedance (ZZT) measured for MZP4749ATAG?
ZZT for MZP4749ATAG is measured as the dynamic resistance at IZT = 25 mA using a 60-second AC voltage superimposed on DC bias, where the AC rms current equals 10% of IZT. The datasheet specifies ZZT ≤ 10.5 Ω under these conditions, directly impacting regulation accuracy under load transients.
MZP4749ATAG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 18.2 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
MZP4749ATAG FAQ
1.How can I place an order for MZP4749ATAG through Aetrix?
Please submit a Request for Quotation (RFQ) for MZP4749ATAG 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 MZP4749ATAG reliable?
The price and inventory of MZP4749ATAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MZP4749ATAG is usually 5 days.
3.What payment methods are accepted for MZP4749ATAG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MZP4749ATAG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MZP4749ATAG?
MZP4749ATAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MZP4749ATAG 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 MZP4749ATAG?
For technical support, including MZP4749ATAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MZP4749ATAG requirements.
6.How does Aetrix verify that MZP4749ATAG is sourced from the original manufacturer or authorized distributors?
All MZP4749ATAG 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 MZP4749ATAG meets industry standards.
7.What is the process for return or replacement of MZP4749ATAG?
All MZP4749ATAG units undergo pre-shipment inspection (PSI). If there is an issue with MZP4749ATAG, 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 MZP4749ATAG part is unused and in its original packaging.
Return procedure for MZP4749ATAG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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