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Microchip Technology 1N4738PE3/TR8
- Part No.:
- 1N4738PE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4738PE3/TR8.pdf
- Description:
- DIODE ZENER 8.2V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,975
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Product details
Overview
1N4738PE3/TR8 from Microsemi is a 1.0 W, 8.2 V ±5% axial-lead silicon Zener diode in DO-41 plastic package, rated for 31 mA test current, 4.5 Ω dynamic impedance at IZT, and 6 mA maximum reverse leakage at 6.2 V, used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4738PE3/TR8 datasheet, 1N4738PE3/TR8 pinout, 1N4738PE3/TR8 application, or 1N4738PE3/TR8 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (45 °C/W junction-to-lead), surge current rating (500 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR8).
Technical Context
This device operates in reverse breakdown to maintain stable 8.2 V output across a wide current range (0.25–500 mA), with sharp knee characteristics verified by dual-point Zener impedance measurement per MicroNote 202. Its DO-41 plastic encapsulation delivers lower thermal resistance than glass-body variants and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack.
The 1N4738PE3/TR8 exhibits a nominal temperature coefficient near zero (≈0 mV/°C) per Figure 3, enabling stable regulation across –65 °C to +150 °C operating range. It supports steady-state 1.0 W dissipation at lead temperature <105 °C or ambient <45 °C on FR4 board with defined copper pad geometry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V ±5% at 31 mA - defines regulated output level with tight production consistency |
| Power Dissipation | 1.0 W at TL < 105 °C - sets maximum continuous thermal load under lead-heatsink conditions |
| Dynamic Impedance (ZZT) | 4.5 Ω at 31 mA - determines output voltage variation under load transients |
| Reverse Leakage (IR) | 6 µA max at 6.2 V - ensures low standby power loss in high-impedance bias networks |
| Surge Current (ISM) | 500 mA peak (½-sine, 1/120 s) - withstands short-duration overvoltage events without degradation |
| Thermal Resistance | 45 °C/W junction-to-lead - enables direct thermal path design using 3/8″ lead length as heatsink |
| Forward Voltage | 1.2 V max at 200 mA - defines conduction drop when used in forward-biased clamp or OR-ing |
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, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink in reverse bias / forward conduction terminal | Connected to lower-potential node; carries full Zener current during regulation |
| Cathode | Regulated output reference node | Banded end; held at stable 8.2 V above anode when reverse-biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Industry-standard footprint and electrical behavior for drop-in replacement across suppliers |
| RoHS-compliant "e3" suffix | Matte-tin plating meets EU Directive 2011/65/EU and China RoHS II without lead or exemptions |
| Tape-and-reel "TR8" packaging | EIA-296 compliant 8 mm carrier tape for automated SMT placement compatibility |
| Level 1 moisture sensitivity | No dry pack or baking required before PCB assembly per IPC/JEDEC J-STD-020B |
| Nonsensitive to ESD | Withstands >4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator error amplifiers or switching converter TL431-like references. IC Role / Device Role / Timing Role: Voltage reference element providing precise 8.2 V setpoint for control loop stability. Use Value: Maintains ±5% regulation across 0.25–500 mA load range and –65 °C to +150 °C, reducing need for trimming. | Use Scenario: Clamping transient spikes on 5 V or 12 V rails caused by inductive switching or ESD. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground when rail exceeds 8.2 V. Use Value: Withstands 500 mA surge pulses and exhibits low 4.5 Ω dynamic impedance to limit clamped voltage overshoot. |
| Signal Level Translation | Current Source Biasing |
Use Scenario: Generating fixed bias voltages for op-amp input stages or analog sensor excitation. IC Role / Device Role / Timing Role: Stable DC voltage source referenced to system ground in low-power analog signal chains. Use Value: Delivers 8.2 V with 6 µA max leakage at 6.2 V, minimizing loading on high-impedance sources. | Use Scenario: Setting constant current through LEDs or phototransistors via series resistor + Zener bias. IC Role / Device Role / Timing Role: Regulated voltage node establishing predictable I = (VZ − VBE)/R in transistor current mirrors. Use Value: 1.0 W power rating supports up to ~120 mA bias current with adequate thermal margin on standard PCB traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4738A | No "P" (plastic) or "e3" (RoHS) suffix; glass-body construction, Sn/Pb plating, no TR packaging | Higher thermal resistance (junction-to-ambient), not RoHS-compliant, requires dry pack handling | Select only if legacy non-RoHS assembly or glass-package mechanical requirements apply |
| MMSZ4702T1G | Surface-mount SOD-123 package, 8.2 V ±5%, 500 mW rating, 30 mA IZT, 5 Ω ZZT | Lower power, smaller footprint, unsuitable for high-surge or lead-heatsink thermal paths | Choose for space-constrained PCBs where 500 mW derated operation suffices and reflow compatibility is needed |
Compared with 1N4738A and MMSZ4702T1G, the 1N4738PE3/TR8 uniquely combines 1.0 W power, DO-41 axial-leaded thermal management, RoHS compliance, and EIA-296 tape-and-reel-making it optimal for industrial power supplies requiring robust, through-hole mounted regulation with full lifecycle traceability.
Availability
1N4738PE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, telecom line card protection, and automotive body control modules requiring stable component supply, long-term obsolescence mitigation, and RoHS-compliant procurement.
Supply support for 1N4738PE3/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 cost-effective, JEDEC-standard voltage regulation in harsh-environment power systems where thermal stability, surge resilience, and long-term parametric consistency are critical.
FAQ
What is the Zener voltage tolerance of the 1N4738PE3/TR8?
The 1N4738PE3/TR8 has a nominal Zener voltage of 8.2 V with a tolerance of ±5%, as confirmed by the "A" suffix in its base part number and JEDEC registration. This tolerance applies at 31 mA test current and 25 °C lead temperature, and is maintained across the full operating temperature range of –65 °C to +150 °C per Microsemi's published characterization data.
Does the 1N4738PE3/TR8 require dry packing before PCB assembly?
No, the 1N4738PE3/TR8 does not require dry packing. It is classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B due to its void-free thermosetting epoxy DO-41 package, allowing indefinite floor life at ambient conditions without baking or humidity-controlled storage.
What is the maximum surge current rating for the 1N4738PE3/TR8?
The 1N4738PE3/TR8 is rated for a maximum non-repetitive reverse surge current (ISM) of 500 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating enables reliable transient suppression in power rail protection applications without permanent parameter shift.
Is the 1N4738PE3/TR8 compatible with lead-free reflow soldering processes?
Yes, the 1N4738PE3/TR8 features RoHS-compliant annealed matte-tin plating and is qualified for solder reflow at 260 °C for up to 10 seconds, meeting industry-standard lead-free assembly requirements. Its plastic DO-41 body remains structurally stable under these thermal profiles.
How does the thermal resistance of the 1N4738PE3/TR8 compare to glass-body Zeners?
The 1N4738PE3/TR8 has a junction-to-lead thermal resistance of 45 °C/W at 3/8″ (10 mm) lead length, which is lower than equivalent glass-body (G-suffix) versions due to superior thermal conductivity of its plastic molded package-enabling higher sustained power dissipation in lead-heatsink configurations.
1N4738PE3/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):
- 8.2 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 4.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 6 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)
1N4738PE3/TR8 FAQ
1.How can I place an order for 1N4738PE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4738PE3/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 1N4738PE3/TR8 reliable?
The price and inventory of 1N4738PE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4738PE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4738PE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4738PE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4738PE3/TR8?
1N4738PE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4738PE3/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 1N4738PE3/TR8?
For technical support, including 1N4738PE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4738PE3/TR8 requirements.
6.How does Aetrix verify that 1N4738PE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4738PE3/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 1N4738PE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4738PE3/TR8?
All 1N4738PE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4738PE3/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 1N4738PE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4738PE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4738PE3/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
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BZT52C3V6LP-7
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SMAZ12-13-F
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