My Inquiry
My Account
onsemi MZP4749ARLG
- Part No.:
- MZP4749ARLG
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
MZP4749ARLG.pdf
- Description:
- DIODE ZENER 24V 1W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,857
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MZP4749ARLG 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 and overvoltage protection in power supply feedback loops.
For engineers reviewing the MZP4749ARLG datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior at lead temperature >75°C, surge current handling under 1 ms pulses, and compatibility with Pb-free reflow profiles up to 260°C for 10 seconds.
Technical Context
The MZP4749ARLG operates as a silicon-oxide passivated junction Zener regulator with guaranteed limits on six electrical parameters including reverse zener voltage, zener impedance, and leakage current. Its thermal design relies on lead-to-ambient conduction, with maximum steady-state dissipation of 3 W at TL = 75°C and 1 W at TA = 50°C.
It features Class 3 ESD robustness (>16 kV HBM), surge rating per JEDEC standards, and polarity indicated by cathode band. The device is optimized for stable DC regulation where temperature coefficient (≈+10 mV/°C near 24 V) and low dynamic impedance are critical for reference accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8–25.2 V @ IZT = 25 mA; ±5% tolerance ensures predictable clamping in feedback networks. |
| Zener Impedance (ZZT) | 10.5 Ω @ IZT = 25 mA; low dynamic resistance maintains regulation stability under load transients. |
| Leakage Current (IR) | 190 µA @ VR = 18.2 V; enables low-power standby operation without excessive quiescent loss. |
| Surge Power Rating | 98 W @ 1 ms pulse; supports transient overvoltage suppression in industrial power rails. |
| ESD Rating | Class 3 (>16 kV HBM); protects against handling-induced electrostatic discharge during assembly. |
| Package | DO-41 (Case 59), axial-lead, Pb-free; compatible with standard through-hole mounting and automated tape-and-reel (6000/reel). |
Pinout & Package
DO-41 (Case 59) axial-lead plastic package with cathode indicated by polarity band; void-free thermosetting plastic body, 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 | Connected to regulated output node; reverse-biased operation establishes stable reference voltage. |
| Anode | Reference return path | Typically tied to ground or common rail; completes bias path for zener conduction and thermal management via lead conduction. |
Key Features
| Feature | Design Value |
|---|---|
| 3 W steady-state power rating | Enables higher-current regulation than 1 W Zeners without requiring heatsinking in compact designs. |
| Pb-free construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow requirements. |
| Surge-rated junction | Withstands 98 W single-pulse surges, supporting use in unregulated input stages subject to line transients. |
| Silicon-oxide passivated junction | Improves long-term reliability and parameter stability under humidity and thermal cycling stress. |
Applications
| Power Supply Feedback Regulation | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or forward converter feedback loops using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Zener reference element setting precise threshold for TL431-type shunt regulators or discrete error comparators. Use Value: 24 V nominal zener voltage provides margin above typical 20–22 V secondary-side control IC operating ranges while maintaining tight ±5% tolerance. |
Use Scenario: Protecting downstream DC-DC converters or microcontroller I/O pins from input rail overvoltage events. IC Role / Device Role / Timing Role: Passive crowbar element conducting when input exceeds safe threshold, diverting surge energy to ground. Use Value: 98 W 1 ms surge rating allows absorption of transient energy without degradation, unlike lower-wattage Zeners. |
| Industrial Sensor Signal Conditioning | Programmable Reference Voltage Source |
Use Scenario: Providing stable excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in harsh ambient environments. IC Role / Device Role / Timing Role: Precision voltage reference establishing known bias point for ratiometric measurement circuits. Use Value: Low 10.5 Ω zener impedance minimizes output variation under varying sensor loading, improving measurement repeatability. |
Use Scenario: Generating adjustable reference voltages in analog front-end modules via resistor-divider networks. IC Role / Device Role / Timing Role: Primary voltage reference node enabling programmable thresholds for comparators or ADC reference scaling. Use Value: Tight ±5% tolerance and low temperature coefficient (~+10 mV/°C) ensure predictable scaling across operating temperature range. |
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% rating, but rated for 1 W only; zener impedance 12 Ω @ 25 mA; no Class 3 ESD rating. | Limited to low-power regulation; unsuitable for surge-prone or high-current feedback paths. | Select when cost sensitivity outweighs surge robustness and thermal headroom requirements. |
| BZX85C24 | 24 V ±5%, 1.3 W rating, 20 Ω zener impedance @ 5 mA; TO-204AA (DO-41) package; no surge rating specified. | Lower power and higher impedance reduce regulation fidelity in dynamic loads; not validated for 98 W surge. | Prefer for legacy designs where footprint compatibility is required but performance margins are relaxed. |
Compared with MZP4749ARLG, the 1N4749A and BZX85C24 offer identical nominal voltage but lack its 3 W continuous rating, 98 W surge capability, and Class 3 ESD protection-making MZP4749ARLG the only choice for industrial-grade power regulation requiring sustained thermal and transient resilience.
Availability
MZP4749ARLG is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controller (PLC) I/O protection circuits requiring stable component supply with full Pb-free compliance and traceable sourcing.
Supply support for MZP4749ARLG 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, and cloud infrastructure markets.
The MZP4749ARLG belongs to the Surmetic™ 30 Zener series, engineered for high-reliability voltage regulation in demanding environments where thermal stability, surge immunity, and long-term parametric consistency are essential.
FAQ
What is the zener voltage tolerance for MZP4749ARLG?
The MZP4749ARLG 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 at IZT = 25 mA and TL = 30°C. This tolerance is confirmed in the Electrical Characteristics table and applies to all units regardless of marking suffix (e.g., "G" for Pb-free).
Can MZP4749ARLG be used in surface-mount designs?
No - the MZP4749ARLG is an axial-lead DO-41 (Case 59) device intended for through-hole mounting only. It is not compatible with SMT reflow or pick-and-place processes. For surface-mount equivalents, consider onsemi's NSZV24MUT1G or similar SOD-123 packaged Zeners, which differ in thermal performance and surge capability.
What is the maximum allowable lead temperature during soldering for MZP4749ARLG?
The MZP4749ARLG supports a maximum lead temperature of 260°C at a distance of 1/16 inch from the case for up to 10 seconds, per the Mechanical Characteristics section. Exceeding this limit risks internal junction damage or delamination of the passivation layer, degrading long-term reliability.
How does the surge rating of MZP4749ARLG compare to its steady-state power rating?
The MZP4749ARLG is rated for 98 W non-repetitive surge power at 1 ms pulse width, far exceeding its 3 W steady-state dissipation at TL = 75°C. This allows it to absorb short-duration transients without failure, whereas continuous operation above 3 W requires active thermal management or derating per Figure 1.
Is MZP4749ARLG suitable for automotive applications?
The MZP4749ARLG meets AEC-Q200 stress test requirements for passive components and operates across −65°C to +200°C junction temperature range. While not AEC-Q101 qualified as a discrete semiconductor, its robust surge rating, ESD immunity, and Pb-free construction make it widely deployed in automotive body electronics and power distribution modules.
MZP4749ARLG 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):
- 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
MZP4749ARLG FAQ
1.How can I place an order for MZP4749ARLG through Aetrix?
Please submit a Request for Quotation (RFQ) for MZP4749ARLG 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 MZP4749ARLG reliable?
The price and inventory of MZP4749ARLG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MZP4749ARLG is usually 5 days.
3.What payment methods are accepted for MZP4749ARLG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MZP4749ARLG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MZP4749ARLG?
MZP4749ARLG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MZP4749ARLG 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 MZP4749ARLG?
For technical support, including MZP4749ARLG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MZP4749ARLG requirements.
6.How does Aetrix verify that MZP4749ARLG is sourced from the original manufacturer or authorized distributors?
All MZP4749ARLG 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 MZP4749ARLG meets industry standards.
7.What is the process for return or replacement of MZP4749ARLG?
All MZP4749ARLG units undergo pre-shipment inspection (PSI). If there is an issue with MZP4749ARLG, 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 MZP4749ARLG part is unused and in its original packaging.
Return procedure for MZP4749ARLG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MZP4749ARLG Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
