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Vishay General Semiconductor - Diodes Division 1N5221C-TR
- Part No.:
- 1N5221C-TR
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5221C-TR.pdf
- Description:
- DIODE ZENER 2.4V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:4,096
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Product details
Overview
1N5221C-TR from Vishay Semiconductors is a silicon planar Zener diode with 2.4 V nominal Zener voltage, ±2 % tolerance (C-suffix), 500 mW power dissipation, and DO-35 package-designed for precision voltage reference and stabilization in low-power analog circuits, such as sensor biasing and regulator feedback networks.
For engineers reviewing the 1N5221C-TR datasheet, 1N5221C-TR pinout, 1N5221C-TR application, or 1N5221C-TR equivalent, key selection criteria include Zener voltage accuracy at 20 mA test current, dynamic resistance of 1 Ω at IZT1, temperature coefficient of –0.085 %/K, and compliance with MSL level 1 soldering conditions.
Technical Context
This device operates as a single-element, two-terminal voltage reference diode optimized for DC stabilization under thermal equilibrium conditions. Its Zener voltage is specified at IZT = 20 mA with 1.7–20 mA test current range and reverse leakage ≤0.25 μA at VR = 1 V.
The 1N5221C-TR exhibits a negative temperature coefficient (–0.085 %/K) typical for low-voltage Zeners below 5 V, and its junction-to-ambient thermal resistance is 300 K/W with 4 mm lead length-enabling stable operation up to 175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V nominal, ±2 % tolerance - ensures tight regulation in reference circuits requiring <±24 mV deviation at 25 °C. |
| Power Dissipation (Ptot) | 500 mW at TL ≤ 25 °C - supports continuous operation in low-power linear regulators without forced cooling. |
| Test Current (IZT) | 20 mA - defines the operating point where VZ and dynamic resistance are guaranteed per spec. |
| Dynamic Resistance (ZZ) | 1 Ω at IZT1 - minimizes output impedance for high-PSRR voltage references in analog signal chains. |
| Temperature Coefficient (αVZ) | –0.085 %/K - enables predictable drift compensation in temperature-sensitive instrumentation designs. |
| Reverse Leakage (IR) | ≤0.25 μA at VR = 1 V - ensures minimal quiescent current draw in battery-powered sensing nodes. |
Pinout & Package
DO-35 (DO-204AH) glass axial package: cathode identified by band; leads 26 mm min. length, 0.4–0.55 mm diameter; weight ≈125 mg; UL 94 V-0 molding compound; MSL level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward-biased terminal during conduction | Connected to lower-potential node in reverse-bias Zener operation; carries forward current up to 200 mA (VF ≤ 1.1 V). |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential node; maintains stable 2.4 V reference when reverse-biased above knee voltage. |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation than ±5 % (B-suffix) variants-critical for precision feedback loops in LDOs and ADC references. |
| Low dynamic resistance (1 Ω) | Reduces output impedance variation across load changes-improves line regulation in shunt-based voltage references. |
| MSL level 1 rating | Permits standard reflow soldering without dry-packaging or baking-reduces manufacturing overhead for high-volume PCB assembly. |
| 175 °C maximum junction temperature | Supports reliable operation in industrial environments with ambient temperatures up to +125 °C (derated per Fig. 3). |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Reference |
|---|---|
Use Scenario: Biasing bridge sensors and op-amp input stages in 4–20 mA transmitters. IC Role / Device Role / Timing Role: Precision voltage reference for excitation and offset calibration. Use Value: ±2 % VZ tolerance and –0.085 %/K TC ensure <±0.5 % total error over –40 to +85 °C in field-deployed instruments. |
Use Scenario: Providing stable 2.4 V reference to internal ADCs and brown-out detectors in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-current shunt reference enabling <1 μA standby current in sleep mode. Use Value: 0.25 μA max reverse leakage at 1 V ensures minimal battery drain over multi-year deployments. |
| Linear Regulator Feedback Network | Overvoltage Protection Clamp |
Use Scenario: Setting output voltage in adjustable 3-terminal linear regulators (e.g., LM317) via resistor divider. IC Role / Device Role / Timing Role: Stable reference node defining regulation setpoint. Use Value: 1 Ω dynamic resistance minimizes output voltage shift under varying load currents-improving load regulation to ±0.1 %. |
Use Scenario: Clamping transient surges on 3.3 V logic rails during hot-plug events. IC Role / Device Role / Timing Role: Fast-acting voltage clamp limiting rail excursion to 2.4 V + VF. Use Value: 500 mW power rating absorbs short-duration energy spikes without thermal runaway in unregulated supply paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C2V4-TR | ±5 % tolerance, 500 mW, DO-35, same VZ nominal but looser accuracy | Suitable for non-critical biasing where cost > precision | Select 1N5221C-TR when ±2 % stability is required; BZX55C2V4-TR offers lower unit cost for general-purpose use. |
| MMSZ5221ET1G | SOD-123 package, ±5 %, 350 mW, surface-mount, same VZ nominal | Required for automated SMT assembly; lower power rating limits surge handling | Choose 1N5221C-TR for through-hole reliability and higher pulse energy absorption; MMSZ5221ET1G fits space-constrained PCB layouts. |
Compared with BZX55C2V4-TR and MMSZ5221ET1G, the 1N5221C-TR delivers superior voltage accuracy and higher surge capability in axial-leaded form-making it optimal for legacy designs, prototyping, and applications demanding long-term drift stability without rework.
Availability
1N5221C-TR is available at Aetrix Electronics and suitable for industrial sensor conditioning, microcontroller reference design, and linear regulator feedback networks requiring stable component supply across extended production lifecycles.
Supply support for 1N5221C-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
Vishay Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for industrial, automotive, and computing markets.
The 1N52xx family was engineered for precision DC voltage reference and stabilization in analog signal chains-prioritizing tight tolerance, low dynamic impedance, and robust thermal performance in legacy and new-design applications.
FAQ
What is the Zener voltage tolerance for 1N5221C-TR?
The 1N5221C-TR has a nominal Zener voltage of 2.4 V with a guaranteed tolerance of ±2 % at 20 mA test current and 25 °C ambient temperature. This tighter tolerance-denoted by the "C" suffix-is confirmed in Vishay's Document Number 85588, Rev. 2.4, and distinguishes it from the ±5 % "B"-suffix variants. The 1N5221C-TR achieves this accuracy through process-controlled doping and post-trim testing.
What is the maximum power dissipation of 1N5221C-TR?
The 1N5221C-TR has a maximum total power dissipation of 500 mW at lead temperature ≤25 °C, as specified in the Absolute Maximum Ratings table. Derating is required above 25 °C ambient-approximately 3.33 mW/°C reduction per the 300 K/W thermal resistance. This rating applies to continuous DC operation in free-air conditions with 4 mm lead length.
Does 1N5221C-TR have a defined cathode marking?
Yes, the 1N5221C-TR uses a visible cathode band on the glass DO-35 body to identify the cathode terminal. Per Vishay's package drawing (S8-V-3906.04-031), the band is located near one end of the cylindrical envelope, and the opposite lead is the anode. This marking is consistent across all 1N52xx devices and critical for correct polarity in reverse-bias Zener operation.
What is the dynamic resistance of 1N5221C-TR at its test current?
The 1N5221C-TR has a typical dynamic resistance (ZZ) of 1 Ω measured at IZT1 = 20 mA and 25 °C, as listed in the Electrical Characteristics table. This low value reflects the device's ability to maintain stable voltage under small-signal AC variations-essential for noise-sensitive reference applications. The 1N5221C-TR also specifies ZZK = 30 Ω at IZT2 = 1 mA for low-current operation.
Is 1N5221C-TR suitable for reflow soldering?
Yes, the 1N5221C-TR is rated MSL level 1 per J-STD-020, meaning it may be subjected to standard Pb-free reflow profiles (peak temperature ≤260 °C) without preconditioning or dry-packaging. Its DO-35 package uses UL 94 V-0 compliant molding compound, and Vishay explicitly lists "Soldering Conditions: Peak temperature max. 260 °C" in the datasheet-confirming compatibility with automated assembly processes.
1N5221C-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 2.4 V
- Tolerance:
- ±2%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- 175°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5221C-TR FAQ
1.How can I place an order for 1N5221C-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5221C-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 1N5221C-TR reliable?
The price and inventory of 1N5221C-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5221C-TR is usually 5 days.
3.What payment methods are accepted for 1N5221C-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5221C-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5221C-TR?
1N5221C-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5221C-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 1N5221C-TR?
For technical support, including 1N5221C-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5221C-TR requirements.
6.How does Aetrix verify that 1N5221C-TR is sourced from the original manufacturer or authorized distributors?
All 1N5221C-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 1N5221C-TR meets industry standards.
7.What is the process for return or replacement of 1N5221C-TR?
All 1N5221C-TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5221C-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 1N5221C-TR part is unused and in its original packaging.
Return procedure for 1N5221C-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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