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Microchip Technology 1N4748PE3/TR12
- Part No.:
- 1N4748PE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4748PE3/TR12.pdf
- Description:
- DIODE ZENER 22V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,328
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Product details
Overview
1N4748PE3/TR12 from Microsemi is a 22 V, 1 W plastic-encapsulated Zener diode with ±5% voltage tolerance, 11.5 mA test current (IZT), and 23 Ω dynamic impedance (ZZT) at IZT. It regulates voltage in power supply reference, overvoltage protection, and voltage-clamping circuits across industrial and embedded systems.
For engineers reviewing the 1N4748PE3/TR12 datasheet, 1N4748PE3/TR12 pinout, 1N4748PE3/TR12 application, or 1N4748PE3/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45 °C/W junction-to-lead), surge current rating (750 mA), RoHS compliance (e3 suffix), and DO-41 axial-leaded package compatibility with manual and wave soldering.
Technical Context
This device operates in reverse breakdown to maintain stable 22 V regulation across 0.25–750 mA DC current range, with knee current (IZK) of 0.25 mA and corresponding ZZK of 41 Ω. Its temperature coefficient is +5.5 mV/°C near 22 V, supporting predictable drift compensation in precision references.
Designed for through-hole mounting on FR4 PCBs, it delivers 1.0 W steady-state dissipation at lead temperature <105 °C (3/8″ from body) or ambient <45 °C, with thermal resistance of 105 °C/W junction-to-ambient under defined copper pad conditions.
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 consistency |
| Power Dissipation | 1.0 W at TL < 105 °C - sets maximum continuous thermal load without derating |
| Dynamic Impedance (ZZT) | 23 Ω @ IZT - determines output voltage variation under changing load current |
| Test Current (IZT) | 11.5 mA - standard bias condition for Vz measurement and datasheet parameter correlation |
| Max Reverse Current (IR) | 5 μA @ 16.7 V - ensures low leakage below regulation threshold for stable standby operation |
| Surge Current (ISM) | 750 mA - supports transient overvoltage clamping without failure (½-sine, 1/120 s) |
| Operating Temperature | −65 °C to +150 °C - enables deployment in extended 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 | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during regulation; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; held at stable 22 V above anode when reverse current ≥ IZK; used as shunt reference or clamp node |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with 1N47xxA series standards for interchangeability and test methodology |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out before assembly |
| RoHS Compliant (e3) | Lead-free matte-tin plating meets EU Directive 2011/65/EU and J-STD-609 Class 1 |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - withstands human-body-model discharges without parameter shift |
| Plastic encapsulation (P) | Lower thermal resistance (45 °C/W) vs. glass-body variants - improves power handling in compact layouts |
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: Shunt voltage reference providing precise 22 V setpoint for error amplifier comparison. Use Value: Maintains ±5% output regulation despite input ripple and load transients due to low ZZT and stable Vz. |
Use Scenario: Clamping transient spikes on 24 V DC rails in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Crowbar element diverting excess energy to ground when rail exceeds 22 V + tolerance. Use Value: Absorbs 750 mA surge pulses without degradation, protecting downstream MOSFETs and microcontrollers. |
| Voltage-Level Translation | Signal Conditioning Clamp |
Use Scenario: Biasing op-amp inputs to fixed 22 V reference in high-side sensing circuits. IC Role / Device Role / Timing Role: Passive level-shifter establishing known DC offset for analog signal chains. Use Value: Delivers stable reference with <5 μA leakage at 16.7 V, minimizing input bias current errors. |
Use Scenario: Limiting analog sensor output swing to prevent ADC saturation in automotive engine control units. IC Role / Device Role / Timing Role: Bidirectional clamp (with series diode) restricting signal excursion to ±22 V envelope. Use Value: Operates reliably from −65 °C to +150 °C, matching under-hood temperature requirements. |
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 e3 RoHS marking; Sn/Pb terminations only; same Vz, IZT, ZZT, and DO-41 package | Restricted to non-RoHS-compliant legacy production; not suitable for new EU-market designs | Select 1N4748PE3/TR12 for RoHS compliance and modern assembly lines; use 1N4748A only for repair or legacy rework. |
| MMSZ4702T1G | Surface-mount SOD-123 package; 22 V ±5%; 1.0 W rating; 20 Ω ZZT @ 10 mA; 5 μA IR @ 16.7 V | Requires PCB redesign for SMT placement; lower thermal resistance in optimized layout but no axial-leaded drop-in replacement | Choose MMSZ4702T1G for space-constrained boards; retain 1N4748PE3/TR12 for through-hole prototyping, service replacement, or high-reliability leaded assemblies. |
Compared with 1N4748A and MMSZ4702T1G, the 1N4748PE3/TR12 uniquely combines RoHS compliance, JEDEC-standard DO-41 mechanical form factor, and verified 750 mA surge capability-making it optimal for industrial power supply references where regulatory compliance and proven field reliability are mandatory.
Availability
1N4748PE3/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and voltage-level translation applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N4748PE3/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 1N4748PE3/TR12 belongs to Microsemi's legacy 1N47xxAP Zener family, engineered for robust voltage regulation in harsh-environment power systems where stability, surge resilience, and long-term parametric consistency are critical.
FAQ
What is the Zener voltage tolerance of the 1N4748PE3/TR12?
The 1N4748PE3/TR12 has a nominal Zener voltage of 22 V with a ±5% tolerance, as confirmed by its "A" suffix per JEDEC registration. This means the actual measured Vz at 11.5 mA falls between 20.9 V and 23.1 V under standard test conditions (TL = 25 °C, 90 s after current application). The tolerance is guaranteed across the full operating temperature range of −65 °C to +150 °C.
Does the 1N4748PE3/TR12 support automated tape-and-reel assembly?
Yes, the 1N4748PE3/TR12 is supplied in EIA-296 standard tape-and-reel format (indicated by "TR12" in the part number), enabling direct use in pick-and-place machines. The reel contains 12,000 units, and the carrier tape complies with industry-standard pitch, pocket depth, and cover tape adhesion requirements for high-yield axial-leaded component placement.
What is the maximum steady-state power dissipation for the 1N4748PE3/TR12 on a standard PCB?
The 1N4748PE3/TR12 delivers 1.0 W steady-state power dissipation when mounted on an FR4 board with 1 oz copper, 4 mm² pads, and 1 mm track width (25 mm length), provided ambient temperature remains below 45 °C. Above this temperature, linear derating applies at 11.9 mW/°C, per Figure 1 in the official Microsemi datasheet.
How does the thermal resistance of the 1N4748PE3/TR12 compare between lead and ambient measurements?
The 1N4748PE3/TR12 has a junction-to-lead thermal resistance of 45 °C/W (measured at 3/8″ lead length from body), significantly lower than its junction-to-ambient value of 105 °C/W under standardized PCB mounting. This difference highlights the importance of heatsinking via leads in high-power applications, as ambient convection alone limits usable power at elevated temperatures.
Is the 1N4748PE3/TR12 suitable for automotive under-hood applications?
Yes, the 1N4748PE3/TR12 is rated for −65 °C to +150 °C operating and storage temperature, meeting typical under-hood thermal requirements. Its moisture sensitivity level 1 classification, ESD robustness per MIL-STD-750 Method 1020, and 750 mA surge rating make it appropriate for engine control unit voltage clamping and sensor reference functions in qualified automotive designs.
1N4748PE3/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:
- ±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)
1N4748PE3/TR12 FAQ
1.How can I place an order for 1N4748PE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4748PE3/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 1N4748PE3/TR12 reliable?
The price and inventory of 1N4748PE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4748PE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4748PE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4748PE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4748PE3/TR12?
1N4748PE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4748PE3/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 1N4748PE3/TR12?
For technical support, including 1N4748PE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4748PE3/TR12 requirements.
6.How does Aetrix verify that 1N4748PE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4748PE3/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 1N4748PE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4748PE3/TR12?
All 1N4748PE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4748PE3/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 1N4748PE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4748PE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4748PE3/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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MMSZ5245BS-7-F
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Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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