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Microchip Technology 1N5229B/TR
- Part No.:
- 1N5229B/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5229B/TR.pdf
- Description:
- DIODE ZENER 4.3V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:5,023
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Product details
Overview
1N5229B/TR from Microsemi is a 4.3 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current and 22 Ω dynamic impedance at IZK = 0.25 mA, used for precision voltage regulation in low-power analog reference and bias circuits.
For engineers reviewing the 1N5229B/TR datasheet, 1N5229B/TR pinout, 1N5229B/TR application, or 1N5229B/TR equivalent, this part serves as a stable, low-capacitance, ESD-insensitive voltage reference in space-constrained linear power supplies, sensor excitation circuits, and overvoltage protection clamps where thermal stability and JEDEC-standard compliance are required.
Technical Context
The 1N5229B/TR operates as a two-terminal reverse-biased Zener regulator with cathode-band polarity marking, requiring operation with the banded end positive relative to the anode. Its breakdown behavior is characterized by a sharp knee at 4.3 V, verified via 60 Hz AC superposition method per MicroNote 202.
It exhibits a temperature coefficient of ±0.055 %/°C (measured from 25 °C to 125 °C at IZT), minimal junction-to-lead thermal resistance (250 °C/W), and inherent radiation hardness per MicroNote 050-enabling use in industrial and aerospace-qualified designs without derating penalties.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.3 V @ 20 mA - defines stable regulation point under standard test conditions |
| Zener Tolerance | ±5% (B suffix) - ensures voltage accuracy within ±0.215 V at 25 °C |
| Power Dissipation | 500 mW at 25 °C - supports continuous regulation in compact through-hole layouts |
| Zener Impedance | 22 Ω @ IZK = 0.25 mA - indicates low dynamic resistance for stable output under varying load |
| Reverse Leakage | 5.0 μA @ VR = 1.0 V - confirms low off-state current for high-impedance bias networks |
| Temp. Coefficient | ±0.055 %/°C - enables predictable drift compensation in wide-temperature environments |
| Forward Voltage | ≤1.5 V @ 200 mA - ensures safe conduction during transient forward events |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed 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 (unbanded end) | Reference ground node | Connected to circuit common; must be at lower potential than cathode for Zener operation |
| Cathode (banded end) | Regulated output node | Provides stable 4.3 V reference when reverse-biased; polarity critical for correct regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N5229B | Guarantees full six-parameter electrical limits (VZ, IR, ZZT, ZZK, αVZ, VF) per JEDEC spec |
| Low capacitance | Typical <2 pF - minimizes signal coupling in high-frequency sensing and RF-adjacent circuits |
| ESD insensitivity | Passes MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling and assembly |
| Radiation hardness | Inherently radiation-hard per MicroNote 050 - suitable for space-grade and nuclear instrumentation applications |
| Tape-and-reel packaging | "TR" suffix denotes EIA-296 compliant reel - enables automated SMT-compatible through-hole placement |
Applications
| Industrial Sensor Biasing | Low-Power Reference Supply |
|---|---|
Use Scenario: Providing excitation voltage to resistive temperature detectors (RTDs) and strain gauges in factory automation modules. IC Role / Device Role / Timing Role: Zener diode acting as fixed-voltage reference source for bridge excitation and ADC reference scaling. Use Value: Stable 4.3 V output with ±0.055 %/°C TC ensures <±0.5% total error across –40 °C to +85 °C operating range. | Use Scenario: Generating clean, low-noise reference for microcontroller ADCs and comparator thresholds in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Two-terminal shunt regulator establishing precise analog reference independent of supply rail variation. Use Value: 22 Ω dynamic impedance and 5 μA leakage at 1 V ensure minimal loading on LDO outputs and high effective PSRR. |
| Overvoltage Clamp | Linear Power Supply Regulation |
Use Scenario: Protecting input pins of op-amps and microcontrollers against transient surges in 5 V rail systems. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage to 4.3 V before damage threshold of downstream ICs is exceeded. Use Value: Sharp Zener knee and low capacitance (<2 pF) enable sub-10 ns response to fast transients without ringing. | Use Scenario: Regulating unregulated 6–12 V DC inputs to stable 4.3 V for analog subsystems in legacy industrial controllers. IC Role / Device Role / Timing Role: Primary shunt regulator dissipating excess power to maintain constant output under variable load. Use Value: 500 mW rating and 250 °C/W junction-to-lead thermal resistance allow reliable operation up to 175 °C ambient with minimal heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4730A | 4.3 V, ±5%, 1 W DO-41 package - higher power, larger footprint, 10 Ω Zzt | Suitable for higher-current regulation (>30 mA) but requires PCB real estate and thermal margin | Select 1N4730A only if >500 mW dissipation or improved thermal performance is needed; not drop-in due to DO-41 vs. DO-35 lead spacing |
| BZX55C4V3 | 4.3 V, ±5%, 500 mW DO-35 - same package, tighter 100 mV VZ tolerance, 30 Ω Zzt | Better initial accuracy but higher dynamic impedance reduces regulation stability under load variation | Choose BZX55C4V3 when absolute initial voltage match is prioritized over dynamic regulation fidelity |
Compared with 1N4730A and BZX55C4V3, the 1N5229B/TR offers optimal balance of JEDEC-standardized six-parameter guarantees, low dynamic impedance, and proven radiation hardness-making it preferred for mission-critical analog references where long-term stability and environmental resilience outweigh minor cost differences.
Availability
1N5229B/TR is available at Aetrix Electronics and suitable for industrial sensor biasing, low-power reference supplies, and overvoltage clamping requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for 1N5229B/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, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N5229B/TR belongs to Microsemi's legacy 1N52xxB Zener series designed for precision voltage regulation in harsh-environment applications where JEDEC compliance, thermal stability, and intrinsic radiation tolerance are mandatory design requirements.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5229B/TR?
The 1N5229B/TR has a nominal Zener voltage of 4.3 V with a guaranteed tolerance of ±5%, as indicated by the "B" suffix per JEDEC specification. This tolerance applies at 25 °C with 20 mA test current and is validated across the full operating temperature range of –65 °C to +175 °C per Microsemi's characterization data.
Does the 1N5229B/TR require external heat sinking in standard PCB mounting?
No, the 1N5229B/TR does not require external heat sinking when mounted on FR4 with 4 mm² copper pads and 1 mm track width, as its thermal resistance is 310 °C/W junction-to-ambient. At 25 °C ambient, it safely dissipates up to 480 mW; full 500 mW operation is rated at lead temperature <50 °C with 3/8″ lead length from body.
How is polarity identified on the 1N5229B/TR, and what happens if installed backward?
The 1N5229B/TR uses a single black band to mark the cathode terminal; the unbanded end is the anode. If installed backward (anode positive), it behaves as a standard silicon diode with ≤1.5 V forward drop at 200 mA-no regulation occurs, and excessive forward current may cause thermal failure if not current-limited.
Is the 1N5229B/TR RoHS compliant, and how is compliance indicated?
Yes, the 1N5229B/TR is RoHS compliant when ordered with the "e3" suffix (e.g., 1N5229B/TR e3). The base part number without "e3" uses traditional tin-lead plating; RoHS-compliant versions feature annealed matte-tin plating per MIL-STD-750 Method 2026 and are marked accordingly on reels and packaging.
What is the maximum reverse leakage current for the 1N5229B/TR, and at what voltage is it specified?
The 1N5229B/TR specifies a maximum reverse leakage current (IR) of 5.0 μA at VR = 1.0 V, per the Electrical Characteristics table on page 1 of the Microsemi datasheet. This low leakage supports high-impedance bias networks and minimizes quiescent current in battery-operated systems.
1N5229B/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):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 5 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)
1N5229B/TR FAQ
1.How can I place an order for 1N5229B/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5229B/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 1N5229B/TR reliable?
The price and inventory of 1N5229B/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5229B/TR is usually 5 days.
3.What payment methods are accepted for 1N5229B/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5229B/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5229B/TR?
1N5229B/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5229B/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 1N5229B/TR?
For technical support, including 1N5229B/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5229B/TR requirements.
6.How does Aetrix verify that 1N5229B/TR is sourced from the original manufacturer or authorized distributors?
All 1N5229B/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 1N5229B/TR meets industry standards.
7.What is the process for return or replacement of 1N5229B/TR?
All 1N5229B/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5229B/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 1N5229B/TR part is unused and in its original packaging.
Return procedure for 1N5229B/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5229B/TR 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
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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