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Microchip Technology 1N5228B
- Part No.:
- 1N5228B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5228B.pdf
- Description:
- DIODE ZENER 3.9V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,813
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Product details
Overview
1N5228B from Microsemi is a 3.9 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current and 23 Ω dynamic impedance at IZK = 0.25 mA, used for precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N5228B datasheet, 1N5228B pinout, 1N5228B application, or 1N5228B equivalent, this part serves as a stable, temperature-compensated shunt regulator with minimal capacitance, RoHS-compliant plating, and MIL-PRF-19500 screening options for industrial and aerospace-grade designs.
Technical Context
The 1N5228B operates as a reverse-biased shunt regulator with a nominal Zener voltage of 3.9 V at 20 mA, exhibiting a temperature coefficient of −0.060 %/°C and dynamic impedance of 23 Ω at 0.25 mA. It maintains regulation across −65°C to +175°C with thermal resistance of 250 °C/W junction-to-lead.
Its DO-35 glass package features tin-lead or annealed matte-tin plating, cathode band polarity marking, and 0.2 g mass. The device delivers stable regulation under steady-state power of 0.5 W at TL < 50°C or 0.48 W at TA < 25°C on FR4 with defined copper pad geometry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V at 20 mA - defines precise regulation point for low-voltage reference circuits |
| Zener Tolerance | ±5% (B suffix) - ensures predictable voltage window without post-selection |
| Power Dissipation | 500 mW at 25°C - supports continuous operation in compact, non-heatsinked layouts |
| Zener Impedance | 23 Ω at IZK = 0.25 mA - enables stable regulation under light-load and transient conditions |
| Temp Coefficient | −0.060 %/°C - provides predictable drift compensation in wide-temperature environments |
| Reverse Current | 50 μA max @ VR = 1.0 V - ensures low leakage in standby and battery-powered systems |
| Forward Voltage | 1.5 V max @ 200 mA - allows safe forward conduction during fault or bias conditions |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-lead package with cathode indicated by colored band; leads are flexible axial terminals suitable for through-hole mounting on FR4 PCBs with 1 mm track width and 4 mm² copper pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; carries forward current or sinks reverse leakage |
| Cathode | Banded end | Connected to regulated output node; conducts reverse current to maintain VZ under load |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered DO-35 construction | Ensures mechanical and electrical interchangeability across qualified suppliers |
| RoHS-compliant "e3" variant available | Meets environmental compliance without sacrificing thermal or electrical performance |
| MIL-PRF-19500 screening options | Supports JAN/JANTXV-level reliability for defense and space applications |
| Low 23 Ω Zener impedance at 0.25 mA | Delivers tight regulation even under micro-power bias conditions |
| −65°C to +175°C operating range | Enables deployment in automotive engine bays, downhole tools, and industrial controls |
Applications
| Low-Voltage Reference Source | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Providing stable 3.9 V reference for ADC biasing and op-amp feedback networks in sensor signal conditioning modules. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed potential against which analog signals are measured. Use Value: Delivers ±5% initial accuracy and −0.060 %/°C drift, minimizing calibration burden in portable instrumentation. |
Use Scenario: Clamping input voltage to protect microcontroller GPIO pins from ESD or supply transients in industrial HMI panels. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as crowbar element to divert excess energy before IC damage occurs. Use Value: Responds within nanoseconds with 23 Ω dynamic impedance, limiting clamped voltage to ≤4.2 V at 100 mA surge. |
| Power Supply Feedback Divider | Current-Source Bias Network |
Use Scenario: Setting output voltage in isolated flyback converters via optocoupler feedback loop with TL431 replacement. IC Role / Device Role / Timing Role: Precision Zener defining upper divider node in secondary-side regulation path. Use Value: Maintains 3.9 V stability across 1–20 mA operating range, enabling accurate 5 V or 12 V output setpoints. |
Use Scenario: Establishing constant current for LED biasing or transistor base drive in low-cost lighting drivers. IC Role / Device Role / Timing Role: Voltage reference enabling two-resistor current mirror configuration with predictable gain. Use Value: Enables 1% current matching across units using standard 1% resistors due to tight ±5% VZ tolerance. |
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%, DO-41 package, 1.0 W rating, higher thermal resistance (300 °C/W) | Higher power handling but larger footprint; less suitable for space-constrained 3.9 V references | Select when >500 mW dissipation or legacy DO-41 compatibility is required |
| BZX55C3V9 (Vishay) | 3.9 V nominal, ±5%, DO-35 package, 500 mW, 25 Ω Zzt, −0.06 %/°C tempco - near-identical specs | Same form factor and regulation profile; RoHS-only offering without military screening options | Choose for cost-sensitive commercial designs where MIL-PRF-19500 variants are unnecessary |
Compared with 1N5228B, 1N4728A offers higher power but requires layout revision for DO-41, while BZX55C3V9 matches electrical and mechanical specs closely but omits JAN/JANTXV screening paths critical for high-reliability programs.
Availability
1N5228B is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage protection, and analog feedback applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N5228B 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 solutions for aerospace, defense, and industrial markets.
The 1N5228B belongs to Microsemi's legacy DO-35 Zener diode family, engineered for precision voltage regulation in harsh-environment systems where radiation hardness, wide temperature operation, and MIL-spec screening are essential.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5228B?
The 1N5228B has a nominal Zener voltage of 3.9 V at 20 mA test current with a guaranteed tolerance of ±5%, denoted by the "B" suffix per JEDEC specification. This tolerance ensures predictable regulation behavior without requiring unit-by-unit binning in production assemblies.
What package type and lead configuration does the 1N5228B use?
The 1N5228B uses the DO-35 (also designated DO-204AH) hermetically sealed glass axial-lead package. Its leads are flexible, tinned, and marked with a cathode band on the banded end-intended for through-hole mounting with 3/8 inch (10 mm) minimum lead length from the body for thermal derating compliance.
Can the 1N5228B be used in high-temperature environments?
Yes, the 1N5228B is rated for continuous operation from −65°C to +175°C and exhibits inherent radiation hardness per MicroNote 050. Its thermal resistance is specified as 250 °C/W junction-to-lead at 3/8 inch lead length, supporting reliable function in engine control units and downhole electronics.
Does the 1N5228B have RoHS-compliant variants?
Yes, RoHS-compliant versions of the 1N5228B are available with the "e3" suffix (e.g., 1N5228Be3), featuring annealed matte-tin plating that meets MIL-STD-750 Method 2026 solderability requirements without lead content, fully compliant with EU Directive 2011/65/EU.
What are the key differences between the 1N5228B and the 1N4728A?
The 1N5228B is a 3.9 V, 500 mW DO-35 Zener with −0.060 %/°C tempco, while the 1N4728A is a 3.3 V, 1.0 W DO-41 device with higher thermal resistance. Their voltage ratings, packages, and power levels differ significantly-making them non-interchangeable without circuit redesign and layout changes.
1N5228B 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):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 10 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)
1N5228B FAQ
1.How can I place an order for 1N5228B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5228B 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 1N5228B reliable?
The price and inventory of 1N5228B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5228B is usually 5 days.
3.What payment methods are accepted for 1N5228B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5228B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5228B?
1N5228B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5228B 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 1N5228B?
For technical support, including 1N5228B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5228B requirements.
6.How does Aetrix verify that 1N5228B is sourced from the original manufacturer or authorized distributors?
All 1N5228B 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 1N5228B meets industry standards.
7.What is the process for return or replacement of 1N5228B?
All 1N5228B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5228B, 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 1N5228B part is unused and in its original packaging.
Return procedure for 1N5228B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5228B 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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