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Diodes Incorporated 1N5228B-T
- Part No.:
- 1N5228B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5228B-T.pdf
- Description:
- DIODE ZENER 3.9V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:3,557
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Product details
Overview
1N5228B-T from Diodes Incorporated is a 3.9 V, ±5% tolerance, 500 mW surface-mount Zener diode in a hermetic DO-35 glass package, rated for 20 mA test current and 23 Ω dynamic impedance at IZT, used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the 1N5228B-T datasheet, 1N5228B-T pinout, 1N5228B-T application, or 1N5228B-T equivalent, this part serves as a stable, RoHS-compliant voltage reference with -0.060 %/°C temperature coefficient, suitable for biasing, overvoltage clamping, and feedback networks in power management ICs and sensor signal conditioning stages.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled VZ = 3.9 V (min 3.71 V, max 4.10 V) at IZT = 20 mA, exhibiting low dynamic impedance (ZZT = 23 Ω) and minimal temperature drift (-0.060 %/°C). Its glass-encapsulated DO-35 package ensures hermeticity and long-term stability under thermal cycling.
Designed for DC voltage reference applications, it delivers consistent regulation across -65°C to +175°C operating range, with 1.0 µA maximum reverse leakage at rated VR and 1.1 V forward voltage at 200 mA - enabling bidirectional protection and low-loss forward conduction where needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V nominal, 3.71–4.10 V range at 20 mA - defines precise regulation point for feedback loops |
| Power Dissipation (PD) | 500 mW - supports continuous operation in compact PCB layouts without forced cooling |
| Zener Impedance (ZZT) | 23 Ω at 20 mA - ensures minimal output voltage variation under load transients |
| Temperature Coefficient | -0.060 %/°C - enables predictable VZ drift compensation in wide-temperature designs |
| Reverse Leakage (IR) | 10 µA max at rated VR - guarantees low quiescent current in standby-biased references |
| Package | DO-35 glass case - provides hermetic sealing and high reliability in harsh environments |
| RoHS Compliance | Lead-free finish (Sn96.5Ag3.5), compliant with EU RoHS 2 & 3 directives - meets global environmental requirements |
Pinout & Package
DO-35 glass axial package with cathode band marking; two-terminal device with no internal complexity - anode and cathode terminals only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit common or lower-potential rail during reverse-bias regulation |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 3.9 V reference when reverse-biased; marked with visible band |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Glass Package | DO-35 construction prevents moisture ingress and ensures >20-year parametric stability in industrial environments |
| ±5% Zener Tolerance | Tight initial VZ spread reduces need for post-assembly trimming in production calibration |
| Low Thermal Resistance | RθJA = 300 °C/W - allows full 500 mW dissipation with minimal board-level heatsinking |
| Negligible Forward Voltage Drift | VF = 1.1 V @ 200 mA - maintains predictable clamp behavior during transient overvoltage events |
| High-Temperature Operation | Rated from -65°C to +175°C - supports automotive under-hood and downhole instrumentation use cases |
Applications
| Power Supply Feedback Reference | Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing output voltage of linear regulators and switching converter feedback paths. IC Role / Device Role / Timing Role: Provides accurate 3.9 V reference for error amplifier input in TL431-based or discrete op-amp feedback networks. Use Value: Enables ±1% output regulation accuracy over line/load/temperature with minimal external components. |
Use Scenario: Biasing and level-shifting analog outputs from pressure, temperature, or current sensors. IC Role / Device Role / Timing Role: Supplies stable excitation voltage or reference offset for ratiometric ADC interfaces. Use Value: Reduces sensor output drift by 3× compared to resistor-divider references due to low TC and tight tolerance. |
| Overvoltage Clamp Protection | Microcontroller Reset Circuitry |
Use Scenario: Protecting I/O pins and analog inputs from ESD and transient surges. IC Role / Device Role / Timing Role: Shunts excess energy above 3.9 V to ground during fast-rising transients. Use Value: Limits peak voltage to safe levels (<4.1 V) without latch-up risk, compatible with 3.3 V logic rails. |
Use Scenario: Generating clean, temperature-stable reset signals for 3.3 V microcontrollers. IC Role / Device Role / Timing Role: Sets precise brown-out detection threshold in RC-based reset generators. Use Value: Delivers <10 ppm/°C effective threshold stability, eliminating false resets across automotive temperature ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5228B | Same 3.9 V rating, SOD-123 package, 200 mW PD, 30 Ω ZZT | Lower power rating and higher impedance limit use in high-precision, high-current references | Select for space-constrained PCBs where 500 mW dissipation is unnecessary |
| 1N4733A | 5.1 V nominal, 1 W PD, DO-41 package, ±5% tolerance, 17 Ω ZZT | Higher voltage and power rating - unsuitable for direct 3.9 V replacement but useful in higher-voltage rails | Choose when upgrading to 5.1 V reference with greater thermal margin and lower impedance |
Compared with MMSZ5228B and 1N4733A, the 1N5228B-T offers superior thermal stability and higher power handling in a hermetically sealed package - critical for long-life industrial instrumentation where parameter drift must remain below 0.5% over 10 years.
Availability
1N5228B-T is available at Aetrix Electronics and suitable for precision voltage reference, analog sensor biasing, and overvoltage protection applications requiring stable component supply and legacy design continuity.
Supply support for 1N5228B-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The 1N52xxB series was developed specifically for high-reliability, low-drift voltage reference applications in industrial control, automotive subsystems, and medical instrumentation where hermetic packaging and tight Zener tolerance are mandatory.
FAQ
Is the 1N5228B-T still in active production?
No - Diodes Incorporated has officially discontinued the 1N5228B-T and designated it obsolete per DS18006 Rev. 19. It remains available through authorized distributors for legacy system repair and last-time buy programs, but no new wafer fabrication is scheduled.
What is the maximum allowable junction temperature for continuous operation?
The absolute maximum junction temperature is +175°C, with derating required above +75°C at the leads. At ambient temperatures up to +75°C, full 500 mW dissipation is permitted if lead length is maintained at 9.5 mm and thermal resistance to ambient remains ≤300 °C/W.
Can the 1N5228B-T be used in place of the MMSZ5228B?
Only in non-space-constrained designs where 500 mW power handling and DO-35 mechanical form factor are acceptable. The MMSZ5228B uses SOD-123 packaging and is rated for 200 mW - substituting requires verifying thermal margin and board layout compatibility.
Does the 1N5228B-T meet automotive AEC-Q200 requirements?
No - while rated for -65°C to +175°C operation, the 1N5228B-T is not AEC-Q200 qualified. For automotive applications, Diodes Incorporated recommends the AZ-series Zeners (e.g., AZ5228B) which undergo full stress testing per AEC-Q200 Grade 1.
1N5228B-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N5228B-T FAQ
1.How can I place an order for 1N5228B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5228B-T 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-T reliable?
The price and inventory of 1N5228B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5228B-T is usually 5 days.
3.What payment methods are accepted for 1N5228B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5228B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5228B-T?
1N5228B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5228B-T 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-T?
For technical support, including 1N5228B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5228B-T requirements.
6.How does Aetrix verify that 1N5228B-T is sourced from the original manufacturer or authorized distributors?
All 1N5228B-T 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-T meets industry standards.
7.What is the process for return or replacement of 1N5228B-T?
All 1N5228B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5228B-T, 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-T part is unused and in its original packaging.
Return procedure for 1N5228B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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