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Microchip Technology 1N5221A
- Part No.:
- 1N5221A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5221A.pdf
- Description:
- DIODE ZENER 2.4V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:2,129
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Product details
Overview
1N5221A from Microsemi is a 2.4 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 0.25 mA, used for low-power voltage regulation and reference in industrial power supplies and sensor biasing circuits.
For engineers reviewing the 1N5221A datasheet, 1N5221A pinout, 1N5221A application, or 1N5221A equivalent, this page delivers verified electrical specs, thermal derating behavior, Zener voltage temperature coefficient (−0.085 %/°C), and RoHS-compliant packaging options with cathode band polarity marking.
Technical Context
The 1N5221A operates as a two-terminal voltage reference device with sharp reverse breakdown knee, specified at 20 mA test current (IZT) and validated under JEDEC registration. Its Zener impedance (ZZK = 30 Ω at IZK = 0.25 mA) ensures stable regulation across low-current biasing applications.
It exhibits a negative temperature coefficient of −0.085 %/°C over 25–125 °C, confirming its suitability for temperature-stable references below 3.3 V. The DO-35 glass package provides hermetic sealing, ESD insensitivity (MIL-STD-750 Method 1020), and radiation hardness per MicroNote 050.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 2.4 V @ 20 mA - defines precise regulation point for low-voltage reference circuits |
| Zener Tolerance | ±10% (A suffix) - sets worst-case output range (2.16–2.64 V) for design margining |
| Power Dissipation | 0.5 W at 25 °C - limits continuous DC power in linear regulator or shunt reference use |
| Zener Impedance | 30 Ω @ 0.25 mA (ZZK) - determines AC ripple rejection and regulation stability at light loads |
| Temp. Coefficient | −0.085 %/°C - enables predictable drift compensation in temperature-critical analog designs |
| Max Reverse Current | 100 μA @ 1.0 V - defines leakage threshold for standby-mode power budgeting |
| Forward Voltage | 1.5 V max @ 200 mA - constrains forward conduction loss in dual-direction protection schemes |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package with cathode indicated by a single black band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded lead | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Banded lead | Connected to regulated voltage node; must be held positive relative to anode for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Guaranteed VZ, IR, and VF limits per JEDEC spec - ensures cross-manufacturer interchangeability |
| Hermetic glass seal | Enables operation from −65 °C to +175 °C - supports aerospace and downhole industrial environments |
| Radiation hardness | Inherent tolerance per MicroNote 050 - suitable for low-dose space-qualified subsystems |
| Low capacitance | Typical <2 pF (per Figure 2) - preserves high-frequency signal integrity in RF bias networks |
| ESD insensitivity | Qualified per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
Applications
| Industrial Power Monitoring | Sensor Bias Reference |
|---|---|
|
Use Scenario: Providing stable 2.4 V reference for analog front-end comparators in PLC input modules. IC Role / Device Role / Timing Role: Shunt voltage reference regulating supply rail against load transients. Use Value: Tight ±10% tolerance and −0.085 %/°C TC ensure consistent trip-point accuracy across −40 to +85 °C operating range. |
Use Scenario: Biasing thermistor or RTD bridges in environmental monitoring nodes. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source for precision ratiometric measurement. Use Value: 30 Ω ZZK at 0.25 mA minimizes excitation current variation, improving bridge balance stability. |
| Low-Power IoT Node Regulator | Military-Grade Voltage Clamp |
|
Use Scenario: Regulating 2.4 V supply for ultra-low-power microcontrollers in battery-operated edge sensors. IC Role / Device Role / Timing Role: Passive shunt regulator replacing active LDO where quiescent current must be minimized. Use Value: 100 μA max IR at 1.0 V enables sub-1 μA standby leakage, extending coin-cell lifetime beyond 5 years. |
Use Scenario: Overvoltage clamp on 3.3 V logic rails in JAN-certified avionics interface boards. IC Role / Device Role / Timing Role: Transient voltage suppressor with defined clamping threshold and fast response. Use Value: DO-35 hermetic package and MIL-PRF-19500 screening options (e.g., MQ prefix) support Class H reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal, same ±10% tolerance, 1.0 W power rating, DO-41 package | Higher voltage and power; requires PCB layout change due to larger DO-41 footprint | Select when 3.3 V reference and higher surge capability are required; not drop-in for 2.4 V systems |
| MMBZ5221BS | 2.4 V, ±10%, SOT-23 surface-mount, 200 mW rating, 30 Ω ZZK | Same electrical specs but SMT-compatible; lower power and different thermal resistance (350 °C/W) | Choose for automated assembly and space-constrained layouts; verify thermal performance under 20 mA load |
Compared with 1N5221A, 1N4728A offers higher voltage and power but incompatible package, while MMBZ5221BS matches voltage and tolerance in SMT form-enabling miniaturization at the cost of reduced power handling and altered thermal path.
Availability
1N5221A is available at Aetrix Electronics and suitable for industrial power monitoring, sensor bias reference, and low-power IoT node regulator applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1N5221A 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 analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N52xxA/B series was designed as a JEDEC-standardized family of general-purpose, low-power Zener diodes targeting voltage reference, regulation, and clamping in harsh-environment electronics.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5221A?
The 1N5221A has a nominal Zener voltage of 2.4 V with a guaranteed tolerance of ±10%, as designated by the "A" suffix. This means the actual measured VZ at 20 mA test current falls between 2.16 V and 2.64 V at 25 °C, per JEDEC specification and Microsemi's published electrical characteristics table.
Does the 1N5221A have a documented temperature coefficient, and what is its value?
Yes, the 1N5221A has a specified temperature coefficient (αVZ) of −0.085 %/°C, measured between 25 °C and 125 °C at 7.5 mA test current. This negative coefficient indicates that its Zener voltage decreases slightly with rising temperature-a critical parameter for precision reference designs requiring thermal drift compensation.
What package type and marking does the 1N5221A use?
1N5221A uses the DO-35 (DO-204AH) glass axial-leaded package with hermetic sealing. It is marked with the full part number "1N5221A" on the body, and polarity is indicated by a single black cathode band on the banded end, which must be held positive relative to the anode for Zener operation.
Can the 1N5221A be used in RoHS-compliant designs?
Yes-RoHS-compliant versions of the 1N5221A are available with the "e3" suffix (e.g., 1N5221Ae3), featuring annealed matte-tin plating per MIL-STD-750 Method 2026. These devices meet lead-free soldering requirements and are explicitly listed in Microsemi's documentation as RoHS compliant.
What is the maximum power dissipation and thermal resistance of the 1N5221A?
The 1N5221A has a maximum power dissipation of 0.5 W at 25 °C, derating linearly above that temperature. Its thermal resistance is 250 °C/W junction-to-lead (at 3/8″ lead length) or 310 °C/W junction-to-ambient on FR4 board with specified copper pads-key parameters for thermal design validation in enclosed or high-temperature environments.
1N5221A 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):
- 2.4 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)
1N5221A FAQ
1.How can I place an order for 1N5221A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5221A 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 1N5221A reliable?
The price and inventory of 1N5221A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5221A is usually 5 days.
3.What payment methods are accepted for 1N5221A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5221A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5221A?
1N5221A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5221A 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 1N5221A?
For technical support, including 1N5221A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5221A requirements.
6.How does Aetrix verify that 1N5221A is sourced from the original manufacturer or authorized distributors?
All 1N5221A 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 1N5221A meets industry standards.
7.What is the process for return or replacement of 1N5221A?
All 1N5221A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5221A, 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 1N5221A part is unused and in its original packaging.
Return procedure for 1N5221A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5221A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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