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onsemi 1N4749A_S00Z
- Part No.:
- 1N4749A_S00Z
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4749A_S00Z.pdf
- Description:
- DIODE ZENER 24V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:5,022
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Product details
Overview
1N4749A_S00Z from ON Semiconductor is a 24 V, 1 W Zener diode in DO-41 glass package, rated for ±5% tolerance, 10.5 Ω dynamic impedance at 11.4 mA test current, and 5 µA leakage at 19.2 V reverse voltage. It regulates voltage in low-power reference and protection circuits, including power supply feedback loops and overvoltage clamp stages.
For engineers reviewing the 1N4749A_S00Z datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal derating above 50°C (6.67 mW/°C), junction temperature range (–65°C to +200°C), and non-repetitive peak reverse surge capability (190 mA).
Technical Context
This discrete Zener diode operates in reverse breakdown with tightly controlled VZ = 22.8 V (min) to 25.2 V (max) at IZ = 11.4 mA. Its 10.5 Ω Zener impedance (ZZ @ IZ) ensures stable regulation under moderate load variation, while 0.25 mA knee current (IZK) defines the onset of conduction.
The device complies with JEDEC DO-41 mechanical standards, features a cathode band marking, and is rated for 1.0 W power dissipation at lead temperature ≤50°C. Thermal derating begins immediately above 50°C, and storage/operating temperature spans –65°C to +200°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V (min) to 25.2 V (max) at 11.4 mA - defines regulated output voltage window under nominal bias |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - sets maximum continuous DC power handling before thermal derating applies |
| Zener Impedance (ZZ) | 10.5 Ω @ IZ = 11.4 mA - determines AC regulation stiffness and output voltage ripple suppression |
| Leakage Current (IR) | 5 µA @ VR = 19.2 V - specifies off-state current in clamping applications below breakdown threshold |
| Non-Repetitive Peak Reverse Current (IZSM) | 190 mA @ 8.3 ms pulse - quantifies transient surge withstand capability for ESD or inductive kick protection |
| Operating Temperature Range | –65°C to +200°C - enables use in automotive engine compartments and industrial environments without derating |
| Tolerance | ±5% - allows predictable design margining for voltage reference and feedback networks |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single black band on the body. Leads are tinned copper-clad steel, 0.40–0.50 mm diameter, 3/8″ length standard for thermal rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side in reverse-bias operation | Connected to circuit ground or lower potential node when used as shunt regulator or clamp |
| Cathode | Zener breakdown terminal / high-voltage side in reverse-bias operation | Connected to input or rail being regulated; voltage referenced to anode potential |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables precise voltage setting without external trimming in cost-sensitive feedback paths |
| 1.0 W power rating at TL ≤ 50°C | Supports robust overvoltage clamping in 5–24 V systems without heatsinking in ambient <50°C |
| 10.5 Ω dynamic impedance at 11.4 mA | Minimizes output voltage shift under ±10 mA load variation in reference circuits |
| –65°C to +200°C operating range | Validates use in under-hood automotive modules and industrial motor control enclosures |
| DO-41 glass package with cathode band | Ensures mechanical compatibility with legacy through-hole PCB footprints and automated insertion equipment |
Applications
| Switch-Mode Power Supply Feedback | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Provides stable 24 V reference for optocoupler-based feedback in isolated flyback converters. IC Role / Device Role: Shunt voltage reference defining secondary-side regulation threshold. Use Value: Maintains ±1.2 V regulation window across temperature, enabling tight output voltage control without TL431-level complexity. |
Use Scenario: Generates clean reset signal for 3.3 V microcontrollers during brown-out conditions. IC Role / Device Role: Clamps VCC rail to safe level and triggers reset IC when input drops below 19.2 V. Use Value: 5 µA leakage at 19.2 V prevents premature reset assertion while ensuring fast response to undervoltage events. |
| Industrial Sensor Signal Conditioning | Automotive ECU Overvoltage Protection |
Use Scenario: Stabilizes excitation voltage for 4–20 mA current-loop transmitters in PLC analog inputs. IC Role / Device Role: Precision shunt regulator supplying constant 24 V to sensor bridge or amplifier. Use Value: 10.5 Ω ZZ limits voltage drift to <0.1 V under 1 mA load change, preserving measurement linearity. |
Use Scenario: Clamps 12 V battery rail transients up to 190 mA (8.3 ms) in engine control units. IC Role / Device Role: Primary shunt protector against load dump and alternator spikes. Use Value: 190 mA IZSM rating meets ISO 7637-2 Pulse 5a requirements without series resistance penalty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A (ON Semiconductor) | No suffix - same electrical specs, identical DO-41 package, no S00Z traceability marking | Same functional use; lacks S00Z lot/batch traceability per ON Semi internal tracking | Select 1N4749A_S00Z when full manufacturing traceability (date code, die ID, wafer lot) is required for automotive PPAP or medical BOM compliance. |
| BZX55C24 (Vishay) | Same 24 V nominal, ±5%, DO-35 package; 15 Ω ZZ @ 5 mA; lower 500 mW rating | Not suitable for 1 W continuous dissipation; requires layout revision due to smaller DO-35 footprint | Choose BZX55C24 only for space-constrained designs where 500 mW rating suffices and DO-35 mounting is acceptable. |
Compared with 1N4749A_S00Z, the base 1N4749A offers identical performance but lacks S00Z traceability; BZX55C24 provides comparable voltage rating but requires derating to 500 mW and board rework for DO-35 placement.
Availability
1N4749A_S00Z is available at Aetrix Electronics and suitable for switch-mode power supplies, microcontroller reset circuits, industrial sensor conditioning, and automotive ECU overvoltage protection requiring stable component supply and full manufacturing traceability.
Supply support for 1N4749A_S00Z 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and logic solutions for automotive, industrial, cloud, and consumer markets.
The 1N47xxA series was designed as a general-purpose, high-reliability Zener diode family for voltage regulation and transient suppression in cost-sensitive, high-volume applications across automotive and industrial sectors.
FAQ
What is the Zener voltage tolerance of the 1N4749A_S00Z?
The 1N4749A_S00Z has a Zener voltage tolerance of ±5%, meaning its breakdown voltage falls between 22.8 V and 25.2 V when tested at 11.4 mA. This tolerance is guaranteed across the full operating temperature range and is marked on the device body as part of ON Semiconductor's standard 1N47xxA series specification.
Does the 1N4749A_S00Z require a heatsink in typical applications?
The 1N4749A_S00Z does not require a heatsink when operated at ≤1.0 W with lead temperature maintained at or below 50°C. Its thermal derating slope is 6.67 mW/°C above that point. In free-air conditions with standard 3/8″ lead length, it safely dissipates full rated power without additional thermal management below 50°C ambient.
How does the 1N4749A_S00Z differ from the standard 1N4749A?
The 1N4749A_S00Z is functionally identical to the 1N4749A in all electrical and mechanical specifications, but includes enhanced traceability markings (S00Z suffix) indicating full process lot, wafer, and date code visibility per ON Semiconductor internal tracking protocols-required for automotive PPAP submissions and medical device BOM audits.
What is the maximum non-repetitive peak reverse current for the 1N4749A_S00Z?
The 1N4749A_S00Z supports a non-repetitive peak reverse current (IZSM) of 190 mA for an 8.3 ms pulse duration, as defined in ON Semiconductor's 1N4728A–1N4758A datasheet Rev. 8. This rating validates its use in ISO 7637-2 Pulse 5a load-dump protection without external series limiting resistors.
Can the 1N4749A_S00Z be used in place of a 24 V Zener diode with tighter tolerance?
No-the 1N4749A_S00Z is specified at ±5% tolerance only. For tighter voltage control (e.g., ±1%), a precision reference IC like the TL431 or a 1% Zener such as the BZX84-C24LT1G would be required. The 1N4749A_S00Z is optimized for cost-effective, general-purpose regulation-not high-accuracy references.
1N4749A_S00Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- 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:
- -
- Operating Temperature:
- -65°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4749A_S00Z FAQ
1.How can I place an order for 1N4749A_S00Z through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4749A_S00Z 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 1N4749A_S00Z reliable?
The price and inventory of 1N4749A_S00Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4749A_S00Z is usually 5 days.
3.What payment methods are accepted for 1N4749A_S00Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4749A_S00Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4749A_S00Z?
1N4749A_S00Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4749A_S00Z 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 1N4749A_S00Z?
For technical support, including 1N4749A_S00Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4749A_S00Z requirements.
6.How does Aetrix verify that 1N4749A_S00Z is sourced from the original manufacturer or authorized distributors?
All 1N4749A_S00Z 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 1N4749A_S00Z meets industry standards.
7.What is the process for return or replacement of 1N4749A_S00Z?
All 1N4749A_S00Z units undergo pre-shipment inspection (PSI). If there is an issue with 1N4749A_S00Z, 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 1N4749A_S00Z part is unused and in its original packaging.
Return procedure for 1N4749A_S00Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4749A_S00Z Tags
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