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Microchip Technology 1N4748AP/TR12
- Part No.:
- 1N4748AP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4748AP/TR12.pdf
- Description:
- DIODE ZENER 22V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,807
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Product details
Overview
1N4748AP/TR12 from Microsemi is a 1.0 W axial-lead silicon Zener diode with nominal zener voltage 22 V ±5%, 11.5 mA test current (IZT), 23 Ω dynamic impedance (ZZT), and maximum reverse current 5 μA at 16.7 V. It regulates voltage in power supply reference, overvoltage protection, and voltage-clamping circuits across industrial temperature range.
For engineers reviewing the 1N4748AP/TR12 datasheet, 1N4748AP/TR12 pinout, 1N4748AP/TR12 application, or 1N4748AP/TR12 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (45 °C/W junction-to-lead), surge current rating (205 mA), RoHS-compliant "e3" plating, and DO-41 package compatibility with standard axial-lead PCB layouts.
Technical Context
This device operates in reverse breakdown to maintain stable output voltage under varying load and line conditions. Its 22 V nominal zener voltage exhibits a positive temperature coefficient above 5 V, with typical TC of +5.5 mV/°C per Figure 3. The 1.0 W power rating is valid at 25 °C lead temperature (TL), derating linearly to zero at 105 °C TL.
It features a sharp knee in the breakdown curve verified by dual-point Zener impedance measurement (IZT and IZK), ensuring stable regulation. The DO-41 plastic package provides moisture sensitivity level 1 per J-STD-020B, eliminating dry-pack requirements, and supports soldering at 260 °C for 10 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 22 V ±5% at 11.5 mA - defines precise regulation point for feedback loops and reference generation |
| Power Dissipation | 1.0 W at TL < 105 °C - sets maximum continuous power handling on 3/8″ lead length |
| Dynamic Impedance (ZZT) | 23 Ω at IZT = 11.5 mA - determines output voltage variation under load current changes |
| Reverse Leakage Current | 5 μA max at VR = 16.7 V - ensures minimal quiescent current in standby clamping applications |
| Surge Current (ISM) | 205 mA peak (½-sine, 1/120 s) - supports transient overvoltage suppression without failure |
| Thermal Resistance | 45 °C/W junction-to-lead - enables thermal design using lead heatsinking in compact layouts |
| Operating Temperature | –65 °C to +150 °C - validated for automotive under-hood and industrial control environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-lead package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to regulated voltage node; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Industry-standard footprint and electrical behavior enabling drop-in replacement in legacy designs |
| Plastic encapsulation (P suffix) | Lower thermal resistance (45 °C/W) vs. glass-body variants, improving power handling in confined spaces |
| RoHS-compliant "e3" plating | Matte-tin termination compatible with lead-free reflow and wave soldering processes |
| Moisture Sensitivity Level 1 | No dry-pack required before assembly, reducing handling cost and shelf-life constraints |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in production |
Applications
| Power Supply Reference | Voltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Zener diode serves as precision voltage reference source for error amplifier input. Use Value: 22 V ±5% regulation with 23 Ω dynamic impedance ensures <±0.25 V output variation across 5–20 mA load current range. | Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events. IC Role / Device Role / Timing Role: Shunt clamp limiting input voltage to safe levels during ESD or inductive kickback. Use Value: 205 mA surge current rating absorbs 100 ns–1 μs transients without degradation, preserving downstream logic integrity. |
| Overvoltage Protection | Signal Level Translation |
Use Scenario: Safeguarding DC bus lines in motor drives against regenerative voltage spikes. IC Role / Device Role / Timing Role: Primary shunt element diverting excess energy to ground when bus exceeds 22 V threshold. Use Value: 1.0 W continuous dissipation and –65 °C to +150 °C operating range support sustained clamping in high-temp industrial enclosures. | Use Scenario: Biasing analog sensor outputs to match ADC input range in mixed-signal systems. IC Role / Device Role / Timing Role: Fixed-voltage reference establishing upper rail for level-shifting networks. Use Value: Low 5 μA leakage at 16.7 V minimizes loading error on high-impedance sensor sources, preserving signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A (Microsemi) | No "TR12" tape-and-reel packaging; same electrical specs and DO-41 package | Requires manual loading or bulk feed; unsuitable for high-speed SMT placement | Select 1N4748AP/TR12 for automated assembly; choose 1N4748A for prototyping or low-volume hand-soldering |
| MMBZ5248BS (ON Semiconductor) | SOT-23 surface-mount package; 22 V ±5%, 100 mW rating, 25 Ω Zzt | Limited to low-power signal-level clamping; not suitable for >100 mA regulation loads | Choose MMBZ5248BS only for space-constrained PCBs where 1.0 W dissipation is unnecessary |
Compared with 1N4748A and MMBZ5248BS, the 1N4748AP/TR12 delivers full 1.0 W power handling in a tape-and-reel format optimized for through-hole automation, while maintaining JEDEC-standard pinout and thermal performance unmatched by SMT alternatives.
Availability
1N4748AP/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and voltage-clamping applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for 1N4748AP/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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed to deliver JEDEC-standard Zener regulation with enhanced thermal performance and RoHS compliance for industrial power management and protection circuits.
FAQ
What is the zener voltage tolerance for 1N4748AP/TR12?
The 1N4748AP/TR12 has a nominal zener voltage of 22 V with ±5% tolerance, as indicated by the "A" suffix per JEDEC standard. This tolerance applies at 11.5 mA test current and 25 °C lead temperature. The "P" denotes plastic package, and "TR12" specifies 12 mm pitch tape-and-reel packaging per EIA-296.
Can 1N4748AP/TR12 replace 1N4748A in existing designs?
Yes, the 1N4748AP/TR12 is electrically and mechanically identical to 1N4748A except for packaging: it uses tape-and-reel (TR12) instead of bulk or ammo pack. Both share DO-41 package, 22 V ±5% Vz, 1.0 W rating, and RoHS-compliant "e3" plating. No layout or schematic changes are needed.
What is the maximum steady-state power dissipation for 1N4748AP/TR12?
The 1N4748AP/TR12 sustains 1.0 W steady-state power at lead temperature (TL) below 105 °C with 3/8″ (10 mm) lead length from body. On FR4 board with specified copper area, derating begins above 45 °C ambient, reaching zero at 105 °C ambient per Figure 1 in the datasheet.
How is polarity marked on 1N4748AP/TR12?
The cathode of 1N4748AP/TR12 is marked by a distinct color band on the plastic DO-41 body. During Zener operation, the banded end must be held positive relative to the unmarked (anode) end. Forward voltage is ≤1.2 V at 200 mA, confirming standard silicon diode polarity.
Is 1N4748AP/TR12 suitable for automotive applications?
Yes, the 1N4748AP/TR12 operates from –65 °C to +150 °C and meets MIL-PRF-19500 screening levels when ordered with appropriate prefixes (e.g., MV1N4748AP/TR12 for JANTXV). Its moisture sensitivity level 1 and ESD immunity per MIL-STD-750 Method 1020 support under-hood deployment.
1N4748AP/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:
- ±5%
- 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)
1N4748AP/TR12 FAQ
1.How can I place an order for 1N4748AP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4748AP/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 1N4748AP/TR12 reliable?
The price and inventory of 1N4748AP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4748AP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4748AP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4748AP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4748AP/TR12?
1N4748AP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4748AP/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 1N4748AP/TR12?
For technical support, including 1N4748AP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4748AP/TR12 requirements.
6.How does Aetrix verify that 1N4748AP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4748AP/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 1N4748AP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4748AP/TR12?
All 1N4748AP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4748AP/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 1N4748AP/TR12 part is unused and in its original packaging.
Return procedure for 1N4748AP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4748AP/TR12 Tags
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