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onsemi MZ4619
- Part No.:
- MZ4619
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
MZ4619.pdf
- Description:
- DIODE ZENER 3V 0.5W 5%
- Quantity:
- Payment:
- Shipping:
Inventory:39,446
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Product details
Overview
MZ4619 from ON Semiconductor (formerly Motorola) is a 3.0 V, ±5% tolerance, 500 mW hermetically sealed glass Zener diode in DO-204AH (DO-35) package, designed for low-leakage voltage regulation at IZT = 250 µA in precision reference and biasing circuits.
For engineers reviewing the MZ4619 datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal derating behavior, cathode-band polarity identification, and direct alternatives for legacy design continuity and obsolescence mitigation.
Technical Context
The MZ4619 operates as a two-terminal voltage reference with zener breakdown at nominal 3.0 V under 250 µA test current, exhibiting 1600 Ω dynamic impedance (ZZT) and ≤0.8 µA reverse leakage at 1 V. Its double-slug, metallurgically bonded glass construction ensures stable thermal response and hermetic reliability.
Designed for 250 mW low-noise applications, it shares electrical specifications with the 1N4614–1N4627 series except that low-noise testing is omitted. Junction temperature range spans –65°C to +200°C, with lead-to-ambient thermal resistance θLA ≈ 30–40°C/W depending on mounting method.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 3.0 V ±5% - Stable reference voltage at IZT = 250 µA; suitable for low-current bias networks. |
| Max Zener Impedance (ZZT) | 1600 Ω - Dynamic resistance at 250 µA; impacts regulation accuracy under varying load currents. |
| Max Reverse Leakage (IR) | 0.8 µA @ 1 V - Low off-state current enables high-impedance sensing and battery-sensitive designs. |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - Derates linearly above 75°C (4 mW/°C); defines maximum continuous DC power handling. |
| Operating Temperature Range | –65°C to +200°C - Wide junction temperature range supports automotive under-hood and industrial environments. |
| Zener Test Current (IZT) | 250 µA - Standardized low-level test condition used for VZ and ZZT specification; critical for low-power reference use. |
Pinout & Package
Package: DO-204AH (DO-35), hermetically sealed glass case with double-slug construction; cathode indicated by color band; leads are corrosion-resistant and readily solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; negative terminal in zener regulation mode | Connected to lower-potential node; must be held ≤ (cathode voltage – 3.0 V) for regulation. |
| Cathode | Current exit terminal in forward bias; positive terminal in zener regulation mode | Marked with color band; connected to regulated voltage rail; referenced to system ground or bias point. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Prevents moisture ingress and long-term parameter drift; qualified for high-reliability industrial and aerospace legacy systems. |
| Double-slug metallurgical bond | Enhances thermal transfer from junction to leads; improves power handling stability and pulse survivability. |
| Low-leakage operation | 0.8 µA max reverse current at 1 V enables use in ultra-low-power sensor biasing and standby reference circuits. |
| ±5% voltage tolerance | Standard grade for cost-sensitive non-critical references; tighter tolerances available per special request. |
Applications
| Instrumentation Reference | Power Supply Feedback |
|---|---|
|
Use Scenario: Precision analog front-end calibration in portable multimeters and data loggers requiring stable sub-5-V reference. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing fixed 3.0 V node for ADC reference or op-amp biasing. Use Value: Low 0.8 µA leakage minimizes error in high-impedance divider networks; 1600 Ω ZZT ensures <1% regulation shift across 10–250 µA load range. |
Use Scenario: Secondary-side voltage sensing in isolated flyback converters where optocoupler feedback requires accurate threshold detection. IC Role / Device Role / Timing Role: Zener clamp defining feedback threshold for TL431 or optocoupler LED drive circuitry. Use Value: 3.0 V nominal voltage matches common TL431 reference thresholds; DO-35 package allows through-hole placement near transformer secondary winding. |
| Automotive Sensor Biasing | Legacy Industrial Control |
|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in engine coolant or exhaust gas sensors. IC Role / Device Role / Timing Role: Low-power shunt regulator establishing precise bias point for ratiometric measurement circuits. Use Value: –65°C to +200°C operating range accommodates under-hood thermal cycling; hermetic seal prevents degradation in humid, chemically aggressive environments. |
Use Scenario: Voltage clamping and overvoltage protection in PLC input modules and motor drive control logic using legacy discrete designs. IC Role / Device Role / Timing Role: Transient suppression and DC level setting in 24 V DC control rails with minimal board space. Use Value: 500 mW rating supports short-duration surge events per Figure 7a; axial DO-35 footprint fits standard Eurocard and DIN-rail PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4619 | Same 3.0 V ±5%, 500 mW DO-35 package; identical electrical specs per Motorola documentation; differs only in part numbering convention (1N vs MZ prefix). | No functional difference; fully interchangeable in legacy Motorola-design circuits. | Select 1N4619 when sourcing from distributors listing legacy 1N-series stock; same thermal and electrical behavior as MZ4619. |
| BZX55-C3V0 | 3.0 V ±5%, 500 mW DO-35, but specified at IZT = 5 mA (not 250 µA); ZZT = 90 Ω typical - significantly lower impedance but higher test current. | Better regulation under moderate loads (>1 mA), but unsuitable for ultra-low-current (<500 µA) bias networks due to higher minimum operating current. | Choose BZX55-C3V0 for active regulation circuits needing tighter voltage control at >1 mA; avoid where leakage or micro-power operation is critical. |
Compared with MZ4619, 1N4619 offers identical performance and drop-in compatibility, while BZX55-C3V0 trades ultra-low-leakage capability for lower dynamic impedance at higher bias currents - making it suitable only where load current exceeds 500 µA.
Availability
MZ4619 is available at Aetrix Electronics and suitable for instrumentation reference, power supply feedback, and automotive sensor biasing requiring stable component supply despite its obsolete status.
Supply support for MZ4619 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 (formerly Motorola Semiconductor) is a global semiconductor supplier specializing in power management, analog, and discrete devices for automotive, industrial, and communications markets.
The MZ4619 belongs to Motorola's legacy 500 mW DO-35 Zener diode family, engineered for high-reliability voltage regulation in mission-critical analog circuits where hermeticity and thermal stability are essential.
FAQ
What is the nominal Zener voltage and tolerance of the MZ4619?
The MZ4619 has a nominal Zener voltage of 3.0 V with a standard tolerance of ±5%, measured at IZT = 250 µA and TA = 25°C. This tolerance reflects manufacturing variation and is consistent across the MZ46xx series. The MZ4619 datasheet specifies no tighter default tolerance, though special-order variants with tighter limits were available via Motorola representative request.
Is the MZ4619 still in production, and what does "OBSOLETE" mean for this part?
The MZ4619 is officially obsolete per ON Semiconductor documentation, meaning it is no longer manufactured or supported for new designs. However, Aetrix Electronics maintains traceable, tested inventory for legacy system repair and continuity. Obsolescence does not affect electrical or mechanical specifications - all published parameters for MZ4619 remain valid for existing stock.
What is the maximum reverse leakage current for the MZ4619, and at what voltage is it measured?
The MZ4619 has a maximum reverse leakage current (IR) of 0.8 µA, guaranteed and measured at a reverse test voltage (VR) of 1 V. This low leakage supports high-impedance biasing applications such as RTD excitation and precision reference dividers where current draw must remain below 1 µA.
Can the MZ4619 be used in surface-mount designs?
No - the MZ4619 is exclusively packaged in the axial-leaded DO-204AH (DO-35) glass case and has no surface-mount variant. It requires through-hole mounting with 3/8″ lead length for thermal derating compliance. For SMT equivalents, engineers should evaluate modern replacements like BZX84-C3V0 or MMBZ5222B, which differ electrically and thermally from the MZ4619.
What is the Zener impedance (ZZT) of the MZ4619, and why is it specified at 250 µA?
The MZ4619 has a maximum Zener impedance (ZZT) of 1600 Ω, measured at IZT = 250 µA. This low test current reflects its design intent for micro-power applications - unlike higher-power Zeners tested at 5–20 mA, the MZ4619's ZZT value indicates regulation behavior specifically under light-load conditions typical of sensor biasing and reference networks.
MZ4619 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MZ4619 FAQ
1.How can I place an order for MZ4619 through Aetrix?
Please submit a Request for Quotation (RFQ) for MZ4619 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 MZ4619 reliable?
The price and inventory of MZ4619 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MZ4619 is usually 5 days.
3.What payment methods are accepted for MZ4619?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MZ4619 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MZ4619?
MZ4619 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MZ4619 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 MZ4619?
For technical support, including MZ4619 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MZ4619 requirements.
6.How does Aetrix verify that MZ4619 is sourced from the original manufacturer or authorized distributors?
All MZ4619 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 MZ4619 meets industry standards.
7.What is the process for return or replacement of MZ4619?
All MZ4619 units undergo pre-shipment inspection (PSI). If there is an issue with MZ4619, 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 MZ4619 part is unused and in its original packaging.
Return procedure for MZ4619:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MZ4619 Tags
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MM5Z5V1ST1G
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