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Diodes Incorporated 1N5224B-T
- Part No.:
- 1N5224B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5224B-T.pdf
- Description:
- DIODE ZENER 2.8V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,123
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Product details
Overview
1N5224B-T from Diodes Incorporated is a 2.8 V, ±5% tolerance, 500 mW surface-mount Zener diode in a hermetic DO-35 glass package, rated for operation from –65°C to +175°C, with 1.1 V forward voltage at 200 mA and a temperature coefficient of –0.080 %/°C - used for precision voltage reference and low-power regulation in analog sensor signal conditioning circuits.
For engineers reviewing the 1N5224B-T datasheet, 1N5224B-T pinout, 1N5224B-T application, or 1N5224B-T equivalent, key selection considerations include its 20 mA test current, 30 Ω dynamic impedance at IZT, 75 µA maximum reverse leakage at rated VR, and compatibility with lead-free reflow profiles per J-STD-020 Level 1 moisture sensitivity.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 2.8 V reference across load variations, with tight ±5% initial tolerance and low –0.080 %/°C temperature drift enabling predictable performance over industrial temperature ranges. Its 500 mW power rating is valid only when leads are maintained ≤75°C using 9.5 mm lead length per MIL-STD-202.
The DO-35 glass package provides hermetic sealing and high stability, while the Sn96.5Ag3.5 terminal finish ensures solderability and RoHS compliance. Polarity is marked by a cathode band, and the device is optimized for low-current (<20 mA) voltage clamping and biasing applications where thermal derating is managed externally.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.8 V nominal, 2.66–2.94 V range at 20 mA - defines precise clamping level for reference or protection circuits |
| Power Dissipation (PD) | 500 mW at TL ≤75°C - sets maximum continuous DC power under specified lead temperature condition |
| Zener Impedance (ZZT) | 30 Ω at 20 mA - determines output voltage variation under small-signal load changes |
| Reverse Leakage (IR) | ≤75 µA at rated VR - limits error current in high-impedance reference nodes |
| Temperature Coefficient | –0.080 %/°C - quantifies voltage drift per degree Celsius, critical for temperature-stable references |
| Forward Voltage (VF) | 1.1 V at 200 mA - specifies conduction drop when used in forward-biased protection or logic interface roles |
| Operating Temperature | –65°C to +175°C - enables deployment in automotive under-hood, industrial motor control, and aerospace environments |
Pinout & Package
Package: Hermetic DO-35 glass case with axial leads; cathode identified by a single band; total weight ≈0.13 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Low-side connection in Zener mode | Connected to lower potential node when used as shunt regulator or clamp |
| Cathode | Reverse breakdown terminal / High-side connection in Zener mode | Marked with band; connected to higher potential node to enable controlled breakdown at 2.8 V |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Glass Package | Ensures long-term parameter stability and resistance to humidity-induced degradation in harsh environments |
| ±5% Zener Tolerance | Reduces need for post-assembly trimming in cost-sensitive voltage reference designs |
| Lead-Free & RoHS Compliant | Meets EU Directive 2015/863/EU with Sn96.5Ag3.5 terminations compatible with standard reflow profiles |
| J-STD-020 Level 1 MSL | Eliminates bake requirements prior to assembly, reducing manufacturing overhead and handling risk |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Reference |
|---|---|
Use Scenario: Stabilizing bias voltage for analog front-end op-amps in pressure or temperature transducers operating across –40°C to +125°C. IC Role / Device Role / Timing Role: Shunt voltage reference providing 2.8 V rail for ADC input scaling and amplifier offset nulling. Use Value: Tight ±5% tolerance and –0.080 %/°C TC ensure <±15 mV total drift over full temperature range without calibration. | Use Scenario: Supplying a stable reference to an ultra-low-power MCU's internal ADC during battery-powered operation. IC Role / Device Role / Timing Role: Low-current Zener clamp generating 2.8 V from a 3.3 V LDO output for improved ADC accuracy. Use Value: 75 µA max reverse leakage minimizes quiescent current draw, extending battery life in sleep modes. |
| Automotive Cabin Control Panel | Legacy Industrial PLC Input Protection |
Use Scenario: Voltage clamping on LIN bus interface lines exposed to load-dump transients in vehicle HVAC modules. IC Role / Device Role / Timing Role: Transient suppressor limiting line voltage to 2.94 V peak to protect downstream transceiver inputs. Use Value: 500 mW rating and DO-35 thermal mass allow brief 100 ms surge absorption without parametric shift. | Use Scenario: Overvoltage protection on 24 V digital input channels in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Passive shunt limiter clamping induced spikes to ≤2.94 V before optocoupler input stage. Use Value: Hermetic DO-35 construction prevents parameter drift after decades of exposure to factory ambient contaminants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5224B | Surface-mount SOD-123 package; same 2.8 V, ±5%, 500 mW rating; 30 Ω ZZT; RoHS-compliant | Designed for automated pick-and-place; no axial leads; lower profile (1.3 mm height vs. DO-35's 4 mm) | Select for new PCB designs requiring SMT scalability and reduced board area |
| 1N4728A | 3.3 V nominal Zener; 1 W power rating; DO-41 package; ±5% tolerance; 10 Ω ZZT at 76 mA | Higher power and lower impedance, but incompatible voltage level and larger thermal footprint | Use only if system requires 3.3 V reference with higher current capability and can accommodate DO-41 mounting |
Compared with MMSZ5224B, the 1N5224B-T offers identical electrical specs but requires manual or wave-soldering due to axial DO-35 leads; versus 1N4728A, it delivers tighter low-current regulation at 2.8 V but lacks the 1 W surge margin needed in high-energy transient environments.
Availability
1N5224B-T is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, low-power microcontroller reference, automotive cabin control panel, and legacy industrial PLC input protection requiring stable component supply despite end-of-life status.
Supply support for 1N5224B-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 belongs to Diodes' legacy Zener diode product line, engineered for high-stability voltage reference and clamping in cost-sensitive, high-reliability industrial and automotive applications.
FAQ
Is the 1N5224B-T still in active production?
No - Diodes Incorporated has officially discontinued the 1N5224B-T and all 1N5221B–1N5267B variants. It is marked "OBSOLETE – PART DISCONTINUED" in DS18006 Rev. 19. Aetrix Electronics maintains limited legacy stock with full traceability and offers the MMSZ5224B as the recommended drop-in SMT replacement.
What is the maximum allowable junction temperature for continuous operation?
The 1N5224B-T does not specify a maximum junction temperature directly, but its operating temperature range is –65°C to +175°C. Thermal derating begins above 75°C lead temperature, with RθJA = 300°C/W. At 25°C ambient, maximum continuous power is 500 mW only if lead temperature remains ≤75°C - requiring external heat sinking or short lead lengths.
Can this Zener be used in place of a 2.5 V reference for ADC calibration?
No - the 1N5224B-T is rated at 2.8 V nominal (2.66–2.94 V), not 2.5 V. Substituting it for a 2.5 V reference would introduce ≥0.16 V systematic offset, degrading ADC full-scale accuracy by >6%. For 2.5 V applications, consider the 1N5222B (2.5 V) or modern alternatives like the TL431 or REF3025.
Does the DO-35 package support reflow soldering?
The DO-35 package is not designed for standard reflow profiles due to thermal mass mismatch and glass-to-metal seal vulnerability. Diodes Incorporated specifies hand-soldering or wave soldering per MIL-STD-202 Method 208. Reflow may crack the glass envelope or compromise hermeticity; use only with verified low-thermal-shock profiles and strict preheat ramp control.
1N5224B-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):
- 2.8 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 75 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
1N5224B-T FAQ
1.How can I place an order for 1N5224B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5224B-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 1N5224B-T reliable?
The price and inventory of 1N5224B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5224B-T is usually 5 days.
3.What payment methods are accepted for 1N5224B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5224B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5224B-T?
1N5224B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5224B-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 1N5224B-T?
For technical support, including 1N5224B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5224B-T requirements.
6.How does Aetrix verify that 1N5224B-T is sourced from the original manufacturer or authorized distributors?
All 1N5224B-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 1N5224B-T meets industry standards.
7.What is the process for return or replacement of 1N5224B-T?
All 1N5224B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5224B-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 1N5224B-T part is unused and in its original packaging.
Return procedure for 1N5224B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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