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Microchip Technology 1N4748CP/TR12
- Part No.:
- 1N4748CP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4748CP/TR12.pdf
- Description:
- DIODE ZENER 22V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:5,188
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Product details
Overview
1N4748CP/TR12 from Microsemi is a 22 V, 1 W plastic-encapsulated Zener diode with ±5% voltage tolerance, 11.5 mA test current, and 23 Ω dynamic impedance at IZT, designed for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4748CP/TR12 datasheet, 1N4748CP/TR12 pinout, 1N4748CP/TR12 application, or 1N4748CP/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45 °C/W junction-to-lead), surge current rating (205 mA), RoHS-compliant matte-tin plating, and DO-41 axial-leaded package compatibility with standard through-hole assembly.
Technical Context
This device operates in reverse breakdown to maintain stable 22 V regulation across a wide current range (0.25–205 mA), with low knee impedance (41 Ω at 0.25 mA) ensuring sharp turn-on and minimal regulation error under light-load conditions.
Its DO-41 plastic package delivers 45 °C/W junction-to-lead thermal resistance at 10 mm lead length, enabling reliable 1 W dissipation up to 105 °C lead temperature - critical for compact power supply designs where board-level convection cooling is limited.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V ±5% at 11.5 mA - defines nominal regulation point with tight production control for stable reference generation |
| Power Dissipation | 1.0 W at TL < 105 °C - supports continuous operation in high-density PCB layouts with adequate lead heatsinking |
| Dynamic Impedance | 23 Ω at IZT = 11.5 mA - ensures minimal output voltage variation under dynamic load changes |
| Reverse Leakage | <5 μA at 16.7 V - guarantees low quiescent current in standby or battery-backed circuits |
| Surge Current (ISM) | 205 mA (½-sine, 1/120 s) - withstands transient overvoltage events without degradation |
| Thermal Resistance | 45 °C/W junction-to-lead - enables predictable thermal design using standard 3/8″ lead length mounting |
| Operating Temp | −65 °C to +150 °C - qualified for industrial and automotive under-hood environments |
Pinout & Package
DO-41 (DO-204AL) axial-leaded plastic package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward voltage ≤1.2 V @ 200 mA enables use as clamp or protection diode |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; polarity must be observed to achieve 22 V regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Industry-standard footprint and electrical behavior - ensures direct replacement in legacy designs |
| Moisture Sensitivity Level 1 | No dry pack required before reflow - simplifies handling and eliminates bake steps in manufacturing |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD controls during assembly |
| RoHS-compliant "e3" option | Matte-tin plating meets EU RoHS Directive 2011/65/EU - supports global compliance without performance trade-off |
| Tape-and-reel packaging | "TR12" suffix denotes EIA-296 standard 12 mm tape - enables automated pick-and-place for high-volume production |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Provides precise 22 V reference for error amplifier input or shunt regulator node. Use Value: ±5% VZ tolerance and 23 Ω ZZT ensure output voltage drift remains within ±1.5% over line/load variations. | Use Scenario: Clamping transient surges on DC bus lines in motor drives or industrial PLC I/O modules. IC Role / Device Role / Timing Role: Acts as crowbar element to divert excess energy when bus voltage exceeds 22 V. Use Value: 205 mA surge rating and −65 °C to +150 °C operating range sustain repeated clamping without parameter shift. |
| Voltage Monitor Threshold | Signal-Level Shifting |
Use Scenario: Detecting undervoltage/overvoltage conditions in microcontroller supervisory circuits. IC Role / Device Role / Timing Role: Sets trip point for comparator input in reset generator or brown-out detection networks. Use Value: Sharp knee impedance (41 Ω at 0.25 mA) ensures clean transition between logic states with minimal hysteresis. | Use Scenario: Biasing op-amp inputs or level-shifting analog sensor outputs to match ADC input ranges. IC Role / Device Role / Timing Role: Establishes fixed DC offset using Zener's stable reverse breakdown characteristic. Use Value: Low 1.2 V forward voltage allows bidirectional clamping or dual-rail referencing in signal conditioning paths. |
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 "P" suffix → glass-body DO-35 package; higher thermal resistance (105 °C/W junction-to-ambient) | Lower power density suitability; not recommended for >0.5 W continuous operation on FR4 | Select 1N4748CP/TR12 for higher reliability in thermally constrained 1 W designs |
| MMSZ4708T1G | Surface-mount SOD-123 package; 22 V ±5%, but rated at 500 mW and 10 mA IZT | Not suitable for 1 W continuous regulation; requires derating above 70 °C ambient | Choose 1N4748CP/TR12 when full 1 W dissipation and axial-lead mechanical robustness are required |
Compared with 1N4748A and MMSZ4708T1G, the 1N4748CP/TR12 offers superior thermal performance in through-hole applications, guaranteed 1 W operation without ambient derating below 45 °C, and tape-and-reel readiness for automated assembly - making it optimal for industrial power supplies and ruggedized electronics.
Availability
1N4748CP/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and microcontroller voltage monitoring systems requiring stable component supply and long-term lifecycle continuity.
Supply support for 1N4748CP/TR12 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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N47xxAP Zener series was engineered for precision voltage reference and robust overvoltage clamping in mission-critical power systems where thermal stability and long-term parametric consistency are essential.
FAQ
What is the Zener voltage tolerance of the 1N4748CP/TR12?
The 1N4748CP/TR12 has a nominal Zener voltage of 22 V with a ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This tolerance is verified at 11.5 mA test current and 25 °C lead temperature, ensuring consistent regulation performance across production lots and operating conditions.
Does the 1N4748CP/TR12 require moisture preconditioning before reflow soldering?
No - the 1N4748CP/TR12 is classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ambient conditions without dry packing or baking prior to surface mount assembly.
What is the maximum steady-state power dissipation for the 1N4748CP/TR12 on a standard FR4 PCB?
The 1N4748CP/TR12 delivers 1.0 W steady-state power dissipation only when mounted on FR4 with 1 oz copper, 4 mm² pads, and 1 mm × 25 mm traces - at ambient temperatures below 45 °C. Above that, linear derating applies per Figure 1 in the Microsemi datasheet.
Is the 1N4748CP/TR12 RoHS compliant?
Yes - the "e3" in the full part number 1N4748CP/TR12 indicates RoHS-compliant matte-tin terminal plating, fully aligned with Directive 2011/65/EU and compatible with lead-free reflow profiles up to 260 °C for 10 seconds.
Can the 1N4748CP/TR12 be used in place of the 1N4748A in existing designs?
Yes - the 1N4748CP/TR12 shares identical electrical specifications with the 1N4748A but uses a plastic DO-41 package instead of glass DO-35, offering lower thermal resistance (45 vs. 105 °C/W) and improved mechanical ruggedness. No circuit or layout changes are needed for drop-in replacement.
1N4748CP/TR12 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:
- ±2%
- 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)
1N4748CP/TR12 FAQ
1.How can I place an order for 1N4748CP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4748CP/TR12 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 1N4748CP/TR12 reliable?
The price and inventory of 1N4748CP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4748CP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4748CP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4748CP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4748CP/TR12?
1N4748CP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4748CP/TR12 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 1N4748CP/TR12?
For technical support, including 1N4748CP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4748CP/TR12 requirements.
6.How does Aetrix verify that 1N4748CP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4748CP/TR12 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 1N4748CP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4748CP/TR12?
All 1N4748CP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4748CP/TR12, 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 1N4748CP/TR12 part is unused and in its original packaging.
Return procedure for 1N4748CP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4748CP/TR12 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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BZX84C3V3LT1G
onsemi
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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