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Microchip Technology 1N5221BE3/TR
- Part No.:
- 1N5221BE3/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5221BE3/TR.pdf
- Description:
- DIODE ZENER 2.4V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:7,111
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Product details
Overview
1N5221BE3/TR from Microsemi is a 2.4 V, ±5% 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 IZT, used for precision low-power voltage regulation in biasing, reference, and protection circuits.
For engineers reviewing the 1N5221BE3/TR datasheet, 1N5221BE3/TR pinout, 1N5221BE3/TR application, or 1N5221BE3/TR equivalent, this page delivers verified electrical specs, thermal derating behavior, RoHS-compliant plating details, tape-and-reel packaging confirmation, and validated alternative options for legacy Zener replacement scenarios.
Technical Context
This device operates as a reverse-biased voltage reference with a sharp breakdown knee, specified at 20 mA test current (IZT) and characterized for stable regulation across -65°C to +175°C ambient. Its 30 Ω Zener impedance (ZZT) at IZT and 1200 Ω impedance at knee current (ZZK @ 0.25 mA) confirm low-noise, predictable regulation performance under light and moderate load conditions.
The 1N5221BE3/TR features a negative temperature coefficient of -0.085 %/°C, enabling predictable drift compensation in multi-device references, and exhibits minimal capacitance per Figure 2 - critical for high-frequency stability in analog feedback paths and low-jitter timing references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 2.4 V @ 20 mA - precise low-voltage reference for 3.3 V or 5 V rail monitoring and biasing |
| Zener Tolerance | ±5% (B suffix) - ensures predictable regulation window without post-calibration in cost-sensitive designs |
| Power Dissipation | 500 mW at 25°C - supports continuous operation in compact through-hole layouts with standard FR4 thermal relief |
| Zener Impedance | 30 Ω @ IZT - maintains tight voltage regulation under varying load currents up to 20 mA |
| Operating Temperature | -65°C to +175°C - qualified for aerospace, downhole, and industrial environments without derating penalties |
| Forward Voltage | ≤1.5 V @ 200 mA - enables use as a clamping diode in bidirectional transient suppression circuits |
| Thermal Resistance | 250 °C/W junction-to-lead - allows direct lead-sink thermal path design for high-reliability mounting |
Pinout & Package
Hermetically sealed axial-lead DO-35 (DO-204AH) glass package with cathode band marking; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias reference return node | Connected to system ground or lower-potential rail; defines Zener conduction direction when cathode is biased positive |
| Cathode | Zener regulation output terminal | Banded end; must be held at higher potential than anode to achieve 2.4 V regulated output; serves as stable reference point for feedback networks |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N5221 series | Guarantees interoperability with legacy designs and standardized test methodologies across OEMs and contract manufacturers |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin plating - no lead content, full process traceability |
| Tape-and-reel "TR" option | Enables automated SMT-compatible placement despite axial-leaded form factor - reduces manual assembly labor in hybrid boards |
| Radiation-hardened construction | Inherently radiation-tolerant per MicroNote 050 - suitable for space-qualified power conditioning and satellite telemetry interfaces |
| Nonsensitive to ESD | Qualified to MIL-STD-750 Method 1020 - eliminates need for handling precautions during board assembly and field repair |
Applications
| Low-Voltage Reference Generator | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Providing stable 2.4 V reference for ADC voltage dividers and op-amp bias networks in battery-powered sensor nodes. IC Role / Device Role / Timing Role: Precision shunt reference establishing known voltage threshold independent of supply rail fluctuations. Use Value: Enables <1% measurement accuracy over -40°C to +85°C using only passive components and the 1N5221BE3/TR's guaranteed ±5% VZ tolerance. | Use Scenario: Protecting 3.3 V GPIO pins from transient spikes exceeding 2.4 V during hot-plug or ESD events. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverting excess current away from sensitive CMOS inputs before damage occurs. Use Value: Leverages 1N5221BE3/TR's 1.5 V forward voltage and 500 mW surge capability to absorb >100 mA transients without degradation. |
| Temperature-Stable Bias Network | Legacy Power Supply Feedback Element |
Use Scenario: Setting base-emitter bias in high-temperature amplifier stages where silicon transistor VBE drift must be compensated. IC Role / Device Role / Timing Role: Negative TC Zener (-0.085 %/°C) counterbalancing positive TC of bipolar junction transistors. Use Value: Achieves <±2 mV/°C net drift in bias voltage over -55°C to +125°C using single 1N5221BE3/TR and matched transistor pair. | Use Scenario: Closing feedback loop in linear regulator ICs (e.g., LM317) requiring external 2.4 V reference for adjustable output configuration. IC Role / Device Role / Timing Role: Primary voltage-setting element defining output regulation setpoint via resistor divider ratio. Use Value: Guarantees output accuracy within ±5% due to 1N5221BE3/TR's JEDEC-verified VZ limits and stable ZZT across production lots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5221BRLG | Same 2.4 V ±5%, DO-35 package, but "RLG" suffix indicates bulk packaging (not tape-and-reel); identical electrical specs and RoHS compliance | No TR tape-and-reel format - unsuitable for automated pick-and-place; requires manual or vibratory feeder handling | Select 1N5221BRLG only for low-volume prototyping or repair where reel logistics are unnecessary |
| MMBZ5221BS | SOT-23 surface-mount package; same 2.4 V ±5%, but 225 mW power rating and 35 Ω Zener impedance - not drop-in compatible | Requires PCB redesign for SMT footprint; lower power dissipation limits continuous regulation current to ~12 mA | Choose MMBZ5221BS only when board space constraints prohibit axial-leaded components and thermal load permits reduced power handling |
Compared with 1N5221BRLG and MMBZ5221BS, the 1N5221BE3/TR uniquely combines tape-and-reel automation support, full 500 mW dissipation, and legacy DO-35 mechanical compatibility - making it the sole choice for volume production of industrial control modules requiring field-proven reliability and zero layout change.
Availability
1N5221BE3/TR is available at Aetrix Electronics and suitable for industrial control panels, aerospace telemetry interfaces, and medical diagnostic equipment requiring stable component supply with long-term obsolescence mitigation.
Supply support for 1N5221BE3/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, radiation-hardened, and aerospace-grade discrete and analog components.
The 1N5221BE3/TR belongs to Microsemi's legacy 1N52xxB Zener series - engineered for mission-critical voltage reference and regulation in environments where long-term parametric stability and extreme temperature survivability are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5221BE3/TR?
The 1N5221BE3/TR has a nominal Zener voltage of 2.4 V with a guaranteed tolerance of ±5%, indicated by the "B" suffix per JEDEC specification. This tolerance applies under standard test conditions (20 mA IZT, 25°C), and the device meets all six electrical parameters - VZ, IR, VF, ZZT, ZZK, and αVZ - unlike non-suffixed variants limited to three parameters.
Does the 1N5221BE3/TR support automated assembly?
Yes, the "TR" suffix on 1N5221BE3/TR confirms EIA-296 standard tape-and-reel packaging, enabling compatibility with pick-and-place machines. The DO-35 axial-lead form factor is accommodated by dedicated feeders, and the RoHS-compliant matte-tin plating ensures reliable solder wetting during reflow or wave soldering processes.
What is the maximum operating temperature for the 1N5221BE3/TR?
The 1N5221BE3/TR is rated for continuous operation from -65°C to +175°C, verified per MIL-PRF-19500 screening requirements. Its hermetically sealed glass DO-35 package and internal bond construction maintain parameter stability across this full range, with thermal resistance of 250°C/W junction-to-lead at 10 mm lead length.
How does the temperature coefficient affect the 1N5221BE3/TR's regulation accuracy?
The 1N5221BE3/TR has a temperature coefficient (αVZ) of -0.085 %/°C, meaning its Zener voltage decreases by approximately 2.04 mV per 1°C rise above 25°C. At 125°C, the shift is ~ -85 mV from nominal 2.4 V - a predictable, linear drift that can be compensated in precision references using complementary positive-TC elements.
Is the 1N5221BE3/TR suitable for transient voltage suppression?
The 1N5221BE3/TR is not designed as a TVS device; however, its 500 mW steady-state power rating and 1.5 V forward voltage allow limited transient clamping in low-energy scenarios (e.g., microcontroller I/O protection). For dedicated surge suppression, purpose-built TVS diodes with higher peak pulse power ratings are recommended instead of relying on the 1N5221BE3/TR.
1N5221BE3/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):
- 2.4 V
- Tolerance:
- ±5%
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5221BE3/TR FAQ
1.How can I place an order for 1N5221BE3/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5221BE3/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 1N5221BE3/TR reliable?
The price and inventory of 1N5221BE3/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5221BE3/TR is usually 5 days.
3.What payment methods are accepted for 1N5221BE3/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5221BE3/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5221BE3/TR?
1N5221BE3/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5221BE3/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 1N5221BE3/TR?
For technical support, including 1N5221BE3/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5221BE3/TR requirements.
6.How does Aetrix verify that 1N5221BE3/TR is sourced from the original manufacturer or authorized distributors?
All 1N5221BE3/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 1N5221BE3/TR meets industry standards.
7.What is the process for return or replacement of 1N5221BE3/TR?
All 1N5221BE3/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5221BE3/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 1N5221BE3/TR part is unused and in its original packaging.
Return procedure for 1N5221BE3/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5221BE3/TR Tags
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MM5Z5V1ST1G
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