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Microchip Technology 1N5222A
- Part No.:
- 1N5222A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5222A.pdf
- Description:
- DIODE ZENER 2.5V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:4,792
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Product details
Overview
1N5222A from Microsemi is a 2.5 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current and 30 Ω dynamic impedance at IZK, operating from −65°C to +175°C. It serves as a precision voltage reference or shunt regulator in low-power analog circuits, power supply feedback paths, and overvoltage protection.
For engineers reviewing the 1N5222A datasheet, 1N5222A pinout, 1N5222A application, or 1N5222A equivalent, key selection criteria include Zener voltage tolerance, temperature coefficient (−0.085 %/°C), thermal resistance (250 °C/W junction-to-lead), reverse leakage (100 μA @ 1.9 V), and RoHS-compliant e3 suffix availability.
Technical Context
The 1N5222A operates as a silicon planar Zener diode with controlled avalanche breakdown at 2.5 V nominal, optimized for stable regulation across wide temperature and current ranges. Its design uses a doped PN junction with hermetically sealed glass DO-35 encapsulation and tin-lead or matte-tin plating for solderability per MIL-STD-750.
It exhibits low capacitance (typical <2 pF), ESD insensitivity (MIL-STD-750 Method 1020), and inherent radiation hardness per MicroNote 050. Thermal performance is defined with 3/8″ (10 mm) lead length from body, delivering 0.5 W dissipation at 25°C with linear derating above that temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 2.5 V @ 20 mA test current - defines regulation setpoint for feedback or reference use |
| Zener Tolerance | ±10% (A suffix) - ensures output stays within 2.25–2.75 V under production variation |
| Zener Impedance | 30 Ω @ IZK = 0.25 mA - determines regulation stiffness under light-load transients |
| Max Reverse Current | 100 μA @ VR = 1.9 V - sets minimum bias current needed before breakdown onset |
| Temp Coefficient αVZ | −0.085 %/°C - indicates voltage drift direction and magnitude over temperature |
| Power Dissipation | 0.5 W at 25°C, derated linearly to zero at 175°C - constrains PCB copper pad design and layout spacing |
| Operating Temp Range | −65°C to +175°C - supports aerospace, downhole, and high-reliability industrial environments |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by a single band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Weight: 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward conduction path when biased >1.5 V |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; regulates voltage referenced to this terminal |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC Registered Device | Complies with JEDEC 1N5222 standard - ensures cross-manufacturer interchangeability and qualification consistency |
| Hermetic Glass Encapsulation | DO-35 package provides moisture and contamination immunity - critical for long-term stability in harsh environments |
| Low Capacitance | Typical <2 pF - minimizes signal coupling and phase shift in RF or high-speed feedback paths |
| Radiation Hardness | Inherently radiation hard per MicroNote 050 - suitable for space-grade and nuclear instrumentation applications |
| ESD Insensitivity | Qualified per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling and assembly |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in discrete linear regulators or TL431-based feedback loops. IC Role / Device Role / Timing Role: Shunt reference element providing stable 2.5 V reference point for error amplifier input. Use Value: Enables ±10% output accuracy without trimming; low tempco ensures <±30 mV drift from −40°C to +85°C. | Use Scenario: Protecting microcontroller I/O pins or ADC inputs from transient overvoltage events. IC Role / Device Role / Timing Role: Passive clamping device diverting excess current to ground when voltage exceeds 2.5 V. Use Value: Limits peak voltage to ≤2.75 V (max VZ) while absorbing up to 500 mW surge energy without failure. |
| Temperature-Stable Reference | Calibration Standard |
Use Scenario: Providing fixed reference in analog sensor signal conditioning circuits requiring minimal drift. IC Role / Device Role / Timing Role: Precision voltage node for op-amp offset nulling or DAC reference scaling. Use Value: −0.085 %/°C tempco yields only −21.25 mV change over 100°C span - superior to generic 5% Zeners. | Use Scenario: Factory calibration of handheld multimeters or portable data loggers. IC Role / Device Role / Timing Role: Traceable 2.5 V reference source used during end-of-line functional test. Use Value: JEDEC registration and ±10% tolerance allow direct substitution into legacy calibration fixtures without requalification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal, same DO-41 package, 1 W rating, ±5% tolerance | Higher power and voltage - unsuitable for 2.5 V reference but better for 3.3 V rail clamping | Select only if system requires ≥3.3 V regulation or >500 mW surge handling |
| BZX55C2V4 | 2.4 V nominal, DO-35 package, ±5% tolerance, 500 mW, 600 Ω ZzT | Lower voltage and tighter tolerance but higher impedance - less stable under dynamic load | Prefer for cost-sensitive 2.4 V references where 0.1 V offset is acceptable and low-frequency stability suffices |
Compared with 1N4728A and BZX55C2V4, the 1N5222A uniquely balances 2.5 V nominal voltage, DO-35 form factor, −0.085 %/°C tempco, and 30 Ω impedance - making it optimal for precision low-voltage shunt regulation where thermal drift and dynamic response matter.
Availability
1N5222A is available at Aetrix Electronics and suitable for power supply feedback, overvoltage clamp, and temperature-stable reference applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for 1N5222A 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and aerospace-grade components.
The 1N52xx series was designed for military, aerospace, and industrial applications demanding extended temperature operation, hermetic reliability, and JEDEC-standardized interchangeability - not general-purpose consumer use.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5222A?
The 1N5222A has a nominal Zener voltage of 2.5 V with a ±10% tolerance (denoted by the "A" suffix). This means its actual breakdown voltage falls between 2.25 V and 2.75 V when tested at 20 mA. The tolerance is guaranteed per JEDEC specification and verified during production screening, making it suitable for non-critical voltage referencing where moderate accuracy suffices.
Does the 1N5222A have a specified temperature coefficient, and how does it affect performance?
Yes, the 1N5222A has a temperature coefficient (αVZ) of −0.085 %/°C, measured from 25°C to 125°C at 7.5 mA. This negative coefficient means its Zener voltage decreases slightly as temperature rises - resulting in approximately −21.25 mV total drift over a 100°C range. Designers must account for this in high-precision references, though it remains among the most stable in the 2.4–3.0 V range of the 1N52xx family.
What package type and marking does the 1N5222A use?
The 1N5222A uses the DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode identified by a single band. It is marked with the full part number "1N5222A" on the glass body. Lead finish is either tin-lead or RoHS-compliant matte-tin per MIL-STD-750 Method 2026, supporting both legacy and compliant assembly processes.
Can the 1N5222A be used in surface-mount designs?
No - the 1N5222A is axial-leaded and intended for through-hole mounting. However, Microsemi offers surface-mount equivalents: the MLL5222 series in DO-213AA (MELF) package, which shares identical electrical specs and "-1" suffix options for internal bond variants. These require separate ordering and PCB footprint redesign.
Is the 1N5222A suitable for high-reliability or extended-temperature applications?
Yes - the 1N5222A is rated for −65°C to +175°C operation and is available in military screening levels (JAN, JANTX, JANTXV, JANS) with appropriate prefixes. Its hermetic glass package, radiation hardness per MicroNote 050, and ESD insensitivity per MIL-STD-750 Method 1020 make it qualified for aerospace, downhole, and industrial control systems where long-term parametric stability is mandatory.
1N5222A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 2.5 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5222A FAQ
1.How can I place an order for 1N5222A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5222A 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 1N5222A reliable?
The price and inventory of 1N5222A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5222A is usually 5 days.
3.What payment methods are accepted for 1N5222A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5222A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5222A?
1N5222A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5222A 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 1N5222A?
For technical support, including 1N5222A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5222A requirements.
6.How does Aetrix verify that 1N5222A is sourced from the original manufacturer or authorized distributors?
All 1N5222A 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 1N5222A meets industry standards.
7.What is the process for return or replacement of 1N5222A?
All 1N5222A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5222A, 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 1N5222A part is unused and in its original packaging.
Return procedure for 1N5222A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5222A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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