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Microchip Technology 1N4748P/TR8
- Part No.:
- 1N4748P/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4748P/TR8.pdf
- Description:
- DIODE ZENER 22V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,107
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Product details
Overview
1N4748P/TR8 from Microsemi is a 22 V, 1 W axial-lead Zener diode in DO-41 plastic package with ±5% voltage tolerance, 11.5 mA test current, and 23 Ω dynamic impedance at IZT, used for precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N4748P/TR8 datasheet, 1N4748P/TR8 pinout, 1N4748P/TR8 application, or 1N4748P/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45 °C/W junction-to-lead), surge current rating (205 mA), reverse leakage (<5 µA at 16.7 V), and RoHS-compliant "e3" plating option.
Technical Context
The 1N4748P/TR8 operates as a two-terminal voltage reference device, maintaining stable 22 V regulation across 1.0 mA to 205 mA reverse current range with sharp knee characteristics confirmed by dual-point Zener impedance measurement per MicroNote 202. Its DO-41 plastic encapsulation delivers lower thermal resistance than glass-body variants.
It exhibits a positive temperature coefficient above 5 V (≈+3.5 mV/°C at 22 V per Figure 3), supports steady-state 1.0 W dissipation at lead temperature <105 °C (3/8″ from body), and meets MIL-STD-750 ESD immunity (Method 1020) without sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V ±5% at IZT = 11.5 mA - defines nominal regulation point with tight production control |
| Power Dissipation | 1.0 W at TL < 105 °C - sets maximum continuous thermal load on lead-mounted PCB layout |
| Dynamic Impedance | 23 Ω at IZT - determines output voltage variation under load transients in feedback networks |
| Reverse Leakage | <5 µA at VR = 16.7 V - ensures minimal error current in high-impedance reference paths |
| Surge Current (ISM) | 205 mA (½-sine, 1/120 s) - defines transient overvoltage clamping capability during line surges |
| Thermal Resistance | 45 °C/W junction-to-lead - enables thermal design using standard lead length (10 mm) mounting |
| Operating Temp | –65 °C to +150 °C - supports industrial and automotive under-hood environments |
Pinout & Package
DO-41 (DO-204AL) plastic molded package with axial leads; cathode indicated by color band; polarity critical for reverse-bias operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side | Connected to circuit ground or lower potential node in Zener shunt regulator configuration |
| Cathode | Zener breakdown terminal / regulated output side | Banded end; connected to input rail or feedback node-must be held positive relative to anode for regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Industry-standard footprint and electrical behavior enabling direct substitution in legacy designs |
| Plastic P-suffix construction | 45 °C/W junction-to-lead thermal resistance-15% lower than equivalent glass-body (G-suffix) devices |
| Moisture Sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B-simplifies SMT handling and storage logistics |
| RoHS-compliant "e3" option | Matte-tin plating per MIL-STD-750 Method 2026-ensures solderability and environmental compliance |
| Tape-and-reel packaging (TR8) | EIA-296 compliant carrier-enables automated pick-and-place assembly for high-volume production |
Applications
| Switching Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulating output voltage in flyback or forward converter feedback networks via optocoupler-coupled TL431 alternatives. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 22 V threshold to drive optocoupler LED in isolated feedback path. Use Value: Stable 22 V regulation maintains ±1% output accuracy across –40 °C to +85 °C ambient with <23 Ω dynamic impedance limiting load-induced drift. | Use Scenario: Providing excitation voltage for bridge-based pressure or strain sensors in factory automation systems. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage reference source for ratiometric analog signal conditioning. Use Value: 5 µA max reverse leakage at 16.7 V minimizes current error in high-impedance Wheatstone bridge arms; DO-41 axial form factor simplifies manual calibration access. |
| Overvoltage Protection Clamp | Microcontroller Reset Circuit |
Use Scenario: Clamping transient spikes on 24 V DC bus lines in motor drive inverters and PLC I/O modules. IC Role / Device Role / Timing Role: Passive crowbar element absorbing surge energy up to 205 mA peak per half-sine pulse. Use Value: 205 mA surge rating and 1.0 W steady-state dissipation enable robust protection without external current limiting resistors in many 24 V applications. | Use Scenario: Generating clean reset threshold for 3.3 V or 5 V microcontrollers during brown-out conditions. IC Role / Device Role / Timing Role: Precision Zener reference feeding comparator input in discrete reset generator circuits. Use Value: ±5% VZ tolerance and sharp knee impedance ensure reliable reset assertion at defined supply thresholds without hysteresis components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A | No TR8 tape-and-reel packaging; bulk or ammo pack only; identical electrical specs and DO-41 package | Not suitable for automated SMT assembly; requires manual or vibration-feed placement | Select 1N4748P/TR8 when board-level automation and traceable reel logistics are required |
| BZX85C22 | Higher ZZT (50 Ω vs. 23 Ω); 1.3 W power rating; DO-41 but non-JEDEC marking format | Less stable regulation under dynamic load; wider VZ tolerance (±5% typical, not guaranteed) | Choose 1N4748P/TR8 where low-impedance regulation and JEDEC-standard consistency are mandatory |
Compared with 1N4748A and BZX85C22, the 1N4748P/TR8 uniquely combines JEDEC registration, TR8 tape-and-reel compatibility, and industry-low 23 Ω dynamic impedance-making it optimal for high-reliability feedback and reference designs requiring both manufacturability and regulation precision.
Availability
1N4748P/TR8 is available at Aetrix Electronics and suitable for switching power supplies, industrial sensor interfaces, overvoltage clamps, and microcontroller reset circuits requiring stable component supply and full traceability.
Supply support for 1N4748P/TR8 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was engineered for ruggedized voltage regulation in mission-critical power systems-emphasizing thermal stability, surge resilience, and long-term parametric consistency under extended temperature cycling.
FAQ
What is the Zener voltage tolerance of the 1N4748P/TR8?
The 1N4748P/TR8 has a ±5% Zener voltage tolerance at 11.5 mA test current, as indicated by the "A" suffix in its JEDEC designation. This means its actual regulation voltage falls between 20.9 V and 23.1 V under specified test conditions, ensuring predictable performance in feedback and reference applications without requiring post-manufacturing trimming.
Does the 1N4748P/TR8 require dry packing before PCB assembly?
No, the 1N4748P/TR8 is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it does not require dry packing or baking prior to reflow soldering. Its void-free epoxy encapsulation and Level 1 classification eliminate moisture-related popcorning risks, simplifying handling and storage for high-volume manufacturing.
What is the maximum surge current rating for the 1N4748P/TR8?
The 1N4748P/TR8 has a maximum surge current (ISM) rating of 205 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This value reflects its ability to absorb transient overvoltages without degradation-critical for use in 24 V industrial bus protection and input-stage clamping circuits.
How does the thermal resistance of the 1N4748P/TR8 compare to glass-body Zeners?
The 1N4748P/TR8 exhibits 45 °C/W junction-to-lead thermal resistance-approximately 15% lower than equivalent glass-body (G-suffix) versions due to superior heat conduction through its plastic molded package. This allows higher sustained power dissipation at the same lead temperature, improving reliability in thermally constrained layouts.
Is the 1N4748P/TR8 RoHS compliant?
Yes, the 1N4748P/TR8 is RoHS compliant, featuring annealed matte-tin plating per MIL-STD-750 Method 2026. The "e3" suffix denotes this compliance, confirming absence of lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE per EU Directive 2011/65/EU, with full documentation available from Microsemi's official product pages.
1N4748P/TR8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 16.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
1N4748P/TR8 FAQ
1.How can I place an order for 1N4748P/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4748P/TR8 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 1N4748P/TR8 reliable?
The price and inventory of 1N4748P/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4748P/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4748P/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4748P/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4748P/TR8?
1N4748P/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4748P/TR8 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 1N4748P/TR8?
For technical support, including 1N4748P/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4748P/TR8 requirements.
6.How does Aetrix verify that 1N4748P/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4748P/TR8 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 1N4748P/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4748P/TR8?
All 1N4748P/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4748P/TR8, 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 1N4748P/TR8 part is unused and in its original packaging.
Return procedure for 1N4748P/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4748P/TR8 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
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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