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Microchip Technology 1N5224B
- Part No.:
- 1N5224B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5224B.pdf
- Description:
- DIODE ZENER 2.8V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:4,461
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Product details
Overview
1N5224B from Microsemi is a 2.8 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current and 1400 Ω dynamic impedance at knee current, used for low-power voltage regulation and reference in analog power supplies and signal conditioning circuits.
For engineers reviewing the 1N5224B datasheet, 1N5224B pinout, 1N5224B application, or 1N5224B equivalent, this page delivers verified electrical specs, thermal derating behavior, Zener temperature coefficient, cathode polarity marking, and RoHS-compliant packaging options - all critical for precision biasing, overvoltage clamping, and stable reference design.
Technical Context
The 1N5224B operates as a reverse-biased silicon Zener diode with sharp breakdown knee at 2.8 V, specified under JEDEC-standard test conditions (IZT = 20 mA, TL = 25°C). Its 1400 Ω Zener impedance (ZZT) at IZK = 0.25 mA confirms stable regulation at low currents, while its −0.080 %/°C temperature coefficient ensures predictable drift across −65°C to +175°C operating range.
Designed for axial-leaded through-hole mounting, it features hermetically sealed glass DO-35 construction, tin-lead or RoHS-compliant matte-tin plating, and cathode identification via band. It exhibits minimal junction capacitance (<2 pF typical), nonsensitivity to ESD per MIL-STD-750 Method 1020, and inherent radiation hardness per MicroNote 050.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 2.8 V at 20 mA test current - defines precise regulation point for low-voltage reference circuits |
| Tolerance | ±5% (B suffix) - guarantees VZ between 2.66 V and 2.94 V at 25°C |
| Power Dissipation | 500 mW at 25°C - sets maximum continuous DC power before thermal derating begins |
| Zener Impedance (ZZT) | 1400 Ω at IZK = 0.25 mA - indicates regulation stability at low bias currents |
| Temperature Coefficient (αVZ) | −0.080 %/°C - quantifies negative drift of VZ with rising temperature |
| Max Reverse Current (IR) | 150 μA at VR = 2.24 V - defines leakage threshold below regulation onset |
| Forward Voltage (VF) | ≤1.5 V at 200 mA - ensures predictable conduction in forward-biased protection paths |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package: hermetically sealed cylindrical glass body with two tinned axial leads; cathode identified by single black band; lead length ≥10 mm (3/8″) required for rated thermal resistance (250 °C/W junction-to-lead).
| 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 | Complies with industry-standard 1N52xxB series definition and test methodology |
| Low-temperature-coefficient regulation | −0.080 %/°C enables stable references in industrial temperature environments |
| Hermetic glass package | Ensures long-term reliability and moisture resistance without conformal coating |
| ESD-nonsensitive design | Withstands handling per MIL-STD-750 Method 1020 without parameter shift |
| RoHS-compliant option | e3 suffix denotes annealed matte-tin plating compliant with EU Directive 2011/65/EU |
Applications
| Low-Voltage Reference Source | Overvoltage Clamp for Signal Lines |
|---|---|
Use Scenario: Providing stable 2.8 V bias for op-amp input stages or ADC reference inputs in battery-powered sensors. IC Role / Device Role / Timing Role: Precision voltage reference element establishing fixed DC offset independent of supply variation. Use Value: Delivers ±5% initial accuracy and −0.080 %/°C drift control, enabling <10 mV total error over −40°C to +85°C ambient. |
Use Scenario: Protecting microcontroller GPIO pins from transient surges on 3.3 V I²C or UART lines. IC Role / Device Role / Timing Role: Shunt clamping device limiting voltage excursion to ≤2.94 V during ESD or inductive kick events. Use Value: Activates at 2.66–2.94 V range with 1400 Ω dynamic impedance, absorbing up to 500 mW surge energy without latch-up. |
| Current-Source Bias Generator | Linear Regulator Feedback Element |
Use Scenario: Setting emitter current in discrete BJT amplifier stages using constant-current sink topology. IC Role / Device Role / Timing Role: Zener-based current-setting element defining base-emitter voltage drop and collector current. Use Value: Maintains 20 mA nominal current with <150 μA leakage at 2.24 V, ensuring predictable transistor bias across temperature. |
Use Scenario: Adjusting output voltage of adjustable linear regulators (e.g., LM317) via resistor divider feedback. IC Role / Device Role / Timing Role: Precision voltage reference replacing standard 2.5 V bandgap in feedback network to achieve 2.8 V output. Use Value: Enables accurate 2.8 V output with ±5% tolerance and low tempco, reducing need for post-calibration trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A (ON Semiconductor) | 3.3 V nominal, ±5%, 1 W rating, DO-41 package - higher power, different voltage, larger footprint | Used where higher power dissipation or 3.3 V regulation is required; not interchangeable due to voltage and package mismatch | Select only if system requires 3.3 V reference and board layout accommodates DO-41 axial leads |
| BZX55C2V7 (Vishay) | 2.7 V nominal, ±5%, 500 mW, DO-35 - 0.1 V lower VZ, identical tolerance and package | Suitable for designs tolerating 2.7 V vs. 2.8 V; same thermal and mounting constraints apply | Acceptable alternative when 2.7 V regulation is functionally acceptable and BOM consolidation is prioritized |
Compared with 1N5224B, 1N4728A offers higher power but incompatible voltage and package, while BZX55C2V7 matches power and form factor but shifts regulation by −0.1 V - requiring verification of downstream circuit margin.
Availability
1N5224B is available at Aetrix Electronics and suitable for low-power voltage reference, signal line clamping, and analog biasing applications requiring stable component supply across industrial, automotive, and medical electronics programs.
Supply support for 1N5224B 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, RF, and timing components for aerospace, defense, and industrial markets.
The 1N52xxB series was designed for precision, low-power voltage regulation in mission-critical analog subsystems where stability, radiation tolerance, and wide temperature operation are essential.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5224B?
The 1N5224B has a nominal Zener voltage of 2.8 V at 20 mA test current, with a guaranteed tolerance of ±5% (denoted by the "B" suffix). This means its actual breakdown voltage falls between 2.66 V and 2.94 V when measured under JEDEC-standard conditions at 25°C.
What package type and marking does the 1N5224B use?
The 1N5224B uses the DO-35 (DO-204AH) glass axial-leaded package with hermetically sealed construction. It is marked with the full part number "1N5224B" and features a single black band identifying the cathode terminal.
How does the 1N5224B behave thermally at elevated temperatures?
The 1N5224B has a thermal resistance of 250 °C/W junction-to-lead (at 10 mm lead length) and derates linearly above 25°C - delivering 500 mW at 25°C, ~375 mW at 75°C, and zero power at 150°C. Its −0.080 %/°C temperature coefficient ensures predictable VZ drift within spec over −65°C to +175°C.
Is the 1N5224B RoHS compliant?
Yes - the 1N5224B is available in RoHS-compliant form with the "e3" suffix (e.g., 1N5224Be3), featuring annealed matte-tin plating that meets EU Directive 2011/65/EU requirements. Standard versions use tin-lead plating per MIL-STD-750 Method 2026.
Can the 1N5224B be used in surface-mount designs?
No - the 1N5224B is exclusively an axial-leaded DO-35 device. For surface-mount equivalents, Microsemi offers the MLL5224B in DO-213AA (MELF) package; it shares identical electrical specs but requires requalification for thermal and mechanical layout.
1N5224B 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):
- 2.8 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 75 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)
1N5224B FAQ
1.How can I place an order for 1N5224B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5224B 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 1N5224B reliable?
The price and inventory of 1N5224B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5224B is usually 5 days.
3.What payment methods are accepted for 1N5224B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5224B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5224B?
1N5224B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5224B 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 1N5224B?
For technical support, including 1N5224B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5224B requirements.
6.How does Aetrix verify that 1N5224B is sourced from the original manufacturer or authorized distributors?
All 1N5224B 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 1N5224B meets industry standards.
7.What is the process for return or replacement of 1N5224B?
All 1N5224B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5224B, 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 1N5224B part is unused and in its original packaging.
Return procedure for 1N5224B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5224B 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
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