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Microchip Technology 1N5228B/TR
- Part No.:
- 1N5228B/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5228B/TR.pdf
- Description:
- DIODE ZENER 3.9V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:3,689
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Product details
Overview
1N5228B/TR 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 IZT, used for low-power voltage regulation and reference in analog power supplies and signal conditioning circuits.
For engineers reviewing the 1N5228B/TR datasheet, 1N5228B/TR pinout, 1N5228B/TR application, or 1N5228B/TR equivalent, this part serves as a precision, temperature-stable, low-capacitance voltage reference with JEDEC-registered compliance, RoHS-compliant e3 variants, and MIL-qualified screening options.
Technical Context
The 1N5228B/TR operates as a reverse-biased Zener regulator with a sharp breakdown knee verified by dual-point impedance testing per MicroNote 202. Its thermal resistance is 250 °C/W junction-to-lead at 3/8″ lead length, enabling stable operation from –65 °C to +175 °C.
It exhibits a nominal temperature coefficient of –0.060 %/°C (25–125 °C), measured at 20 mA, and maintains ≤10 μA reverse leakage at VR = 2.9 V - critical for low-current biasing and reference stability in battery-powered sensors and instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V @ 20 mA - defines regulated output voltage under standard test conditions |
| Zener Tolerance | ±5% (B suffix) - ensures voltage accuracy within ±0.195 V for predictable circuit margining |
| Power Dissipation | 500 mW at 25 °C - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance | 23 Ω @ IZT - determines AC regulation stiffness and ripple rejection capability |
| Reverse Leakage | ≤10 μA @ 2.9 V - guarantees minimal quiescent current in high-impedance reference nodes |
| Temp. Coefficient | –0.060 %/°C - enables predictable drift compensation across industrial temperature range |
| Package | DO-35 (DO-204AH) glass axial-leaded - supports through-hole mounting with hermetic seal and ESD immunity |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package with cathode indicated by color band; operated with banded end positive relative to anode for Zener regulation. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; establishes Zener bias polarity when cathode is held at higher potential |
| Cathode | Zener regulation terminal | Banded end; must be biased positive relative to anode to enter reverse breakdown and regulate voltage |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N5228B | Guarantees full six-parameter electrical limits (VZ, IR, ZZT, ZZK, αVZ, VF), unlike generic ±20% JEDEC types |
| Low dynamic impedance | 23 Ω at 20 mA ensures tight regulation under varying load currents in feedback references |
| Radiation-hardened design | Inherently radiation tolerant per MicroNote 050 - suitable for aerospace and high-reliability embedded systems |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in board-level assembly |
| RoHS-compliant option | e3 suffix available - meets environmental compliance without performance trade-offs in voltage or thermal specs |
Applications
| Low-Power Voltage Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Providing stable 3.9 V reference for ADC biasing and op-amp offset trimming in portable medical sensors. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed voltage node independent of supply variation. Use Value: ±5% tolerance and –0.060 %/°C TC ensure <±20 mV drift over 0–70 °C, meeting Class II medical device accuracy requirements. |
Use Scenario: Clamping transient spikes on 5 V logic rails during hot-swap events in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Shunt limiter diverting excess energy to ground when rail exceeds 3.9 V + forward drop of series diode. Use Value: 500 mW rating and 23 Ω impedance enable reliable clamping of 100 ns transients up to 1 A peak without thermal runaway. |
| Temperature-Stable Bias Network | Legacy Analog Power Supply Regulation |
Use Scenario: Setting collector current in discrete BJT amplifiers where gain stability over temperature is critical. IC Role / Device Role / Timing Role: Zener-based current source reference with compensating resistor network. Use Value: Negative TC (–0.060 %/°C) counterbalances positive VBE drift, reducing total current variation to <±3% across –40 to +85 °C. |
Use Scenario: Regulating unregulated 6–12 V transformer-rectified supplies in legacy test equipment power rails. IC Role / Device Role / Timing Role: Series-pass shunt regulator element dissipating excess voltage as heat. Use Value: 500 mW rating and DO-35 mechanical robustness support continuous operation at 20 mA with >10,000-hour field reliability in fixed-voltage applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage 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 but lower voltage | Requires PCB layout change due to larger DO-41 footprint and different thermal path | Select only if 1 W dissipation or 3.3 V regulation is required; not a direct replacement for 3.9 V function |
| BZX55C3V9 (Vishay) | 3.9 V nominal, ±5%, 500 mW, DO-35 - identical voltage and package, but 60 Ω Zener impedance at 5 mA | Higher impedance reduces regulation accuracy under load variation; requires recalculation of series resistor for same current | Acceptable for non-critical references where cost is prioritized over regulation stiffness |
Compared with 1N4728A and BZX55C3V9, the 1N5228B/TR delivers tighter impedance control (23 Ω vs. ≥60 Ω), JEDEC-registered six-parameter assurance, and proven radiation hardness - making it preferred for precision analog, aerospace, and long-lifecycle industrial designs where parameter stability is non-negotiable.
Availability
1N5228B/TR is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage clamp protection, and temperature-stable bias network applications requiring stable component supply and long-term obsolescence management.
Supply support for 1N5228B/TR 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 radiation-hardened components for aerospace, defense, and industrial markets.
The 1N5228B/TR belongs to Microsemi's legacy 1N52xxB Zener series - engineered for precision voltage regulation in harsh environments, with emphasis on thermal stability, ESD immunity, and long-term parametric consistency.
FAQ
What is the Zener voltage tolerance of the 1N5228B/TR?
The 1N5228B/TR has a nominal Zener voltage of 3.9 V with a guaranteed tolerance of ±5%, as indicated by the "B" suffix per JEDEC specification. This means the actual breakdown voltage falls between 3.705 V and 4.095 V when tested at 20 mA and 25 °C, ensuring predictable regulation in production designs.
Does the 1N5228B/TR require heatsinking in typical applications?
No, the 1N5228B/TR does not require external heatsinking when operated within its 500 mW rating and ambient temperatures below 50 °C. Its thermal resistance is 250 °C/W junction-to-lead at 3/8″ lead length, allowing safe dissipation at 20 mA with standard PCB layout - provided copper pads meet FR4 guidelines (4 mm², 1 mm trace width).
Is the 1N5228B/TR RoHS compliant?
Yes, the 1N5228B/TR can be supplied in RoHS-compliant form with the "e3" suffix (e.g., 1N5228B-e3/TR), featuring annealed matte-tin plating per MIL-STD-750 Method 2026. Standard versions use tin-lead plating, but both meet solderability and reliability requirements for industrial assembly.
How does the temperature coefficient affect 1N5228B/TR performance?
The 1N5228B/TR has a temperature coefficient of –0.060 %/°C, meaning its Zener voltage decreases by approximately 2.34 mV per °C rise above 25 °C. This negative drift is well-characterized and usable for temperature-compensated bias networks - for example, pairing with a positive-drift BJT VBE to achieve net zero drift.
Can the 1N5228B/TR replace the 1N5228A in existing designs?
Yes, the 1N5228B/TR can directly replace the 1N5228A, as both share identical DO-35 packaging, 3.9 V nominal voltage, and operating temperature range. The key difference is tighter tolerance: 1N5228A is ±10%, while 1N5228B/TR is ±5%. No layout or schematic changes are needed, and the improved accuracy may enhance system-level calibration stability.
1N5228B/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- 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/TR FAQ
1.How can I place an order for 1N5228B/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5228B/TR 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/TR reliable?
The price and inventory of 1N5228B/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5228B/TR is usually 5 days.
3.What payment methods are accepted for 1N5228B/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5228B/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5228B/TR?
1N5228B/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5228B/TR 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/TR?
For technical support, including 1N5228B/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5228B/TR requirements.
6.How does Aetrix verify that 1N5228B/TR is sourced from the original manufacturer or authorized distributors?
All 1N5228B/TR 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/TR meets industry standards.
7.What is the process for return or replacement of 1N5228B/TR?
All 1N5228B/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5228B/TR, 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/TR part is unused and in its original packaging.
Return procedure for 1N5228B/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5228B/TR Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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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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