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Microchip Technology 1N4738CE3/TR13
- Part No.:
- 1N4738CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4738CE3/TR13.pdf
- Description:
- DIODE ZENER 8.2V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,368
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Product details
Overview
1N4738CE3/TR13 from Microsemi is a 1.0 W, 8.2 V ±2% tolerance silicon Zener diode in DO-41 plastic package, designed for precision voltage regulation in power supply reference, overvoltage protection, and signal clamping circuits across industrial and embedded systems.
For engineers reviewing the 1N4738CE3/TR13 datasheet, 1N4738CE3/TR13 pinout, 1N4738CE3/TR13 application, or 1N4738CE3/TR13 equivalent, key selection factors include its 8.2 V nominal Zener voltage, 31 mA test current, 4.5 Ω dynamic impedance at IZT, -65°C to +150°C operating range, and RoHS-compliant matte-tin plating.
Technical Context
This device operates in reverse breakdown to maintain stable output voltage under varying load and temperature conditions. Its 2% voltage tolerance (C suffix), low 4.5 Ω Zener impedance at 31 mA, and 0.5 mA maximum reverse leakage at 6.6 V support high-accuracy regulation in feedback loops and reference stages.
The DO-41 axial-leaded package provides 45 °C/W junction-to-lead thermal resistance at 10 mm lead length, enabling reliable 1.0 W dissipation up to 105 °C lead temperature. Polarity is marked by cathode band; regulation requires cathode-positive bias relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V ±2% at 31 mA - defines precise regulation point for feedback networks and voltage references |
| Power Dissipation | 1.0 W at TL < 105 °C - supports continuous operation in compact PCB layouts with adequate lead heatsinking |
| Dynamic Impedance (ZZT) | 4.5 Ω at 31 mA - ensures minimal output voltage variation under dynamic load changes |
| Reverse Leakage (IR) | 6 μA max at 6.6 V - guarantees low quiescent current in standby or low-power monitoring circuits |
| Operating Temperature | -65 °C to +150 °C - validated for automotive under-hood, industrial control, and aerospace environments |
| Forward Voltage | 1.2 V max at 200 mA - enables use as clamp or protection diode in forward-biased configurations |
| Thermal Resistance | 45 °C/W junction-to-lead - allows direct thermal modeling using lead length and PCB copper area |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded 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 | Reference ground node in Zener configuration | Connected to system ground or lower-potential rail; reverse-biased during regulation |
| Cathode | Regulated output node in Zener configuration | Banded end; connected to input rail or feedback point; maintains 8.2 V above anode when conducting |
Key Features
| Feature | Design Value |
|---|---|
| 2% Zener voltage tolerance (C suffix) | Enables tighter regulation than standard 5% parts, reducing need for post-regulation trimming in precision supplies |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and bake-out prior to assembly, lowering manufacturing cost and cycle time |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin plating, compatible with lead-free reflow profiles |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands handling without special grounding protocols, simplifying production line integration |
| Plastic P-suffix construction | Delivers lower thermal resistance vs. glass-body equivalents, improving power handling in same footprint |
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: Zener reference element providing fixed 8.2 V reference to error amplifier input. Use Value: Maintains ±2% output accuracy over temperature and load, eliminating need for external trim potentiometers. | Use Scenario: Clamping transient spikes on 9–12 V DC rails in automotive body electronics. IC Role / Device Role / Timing Role: Shunt protection device diverting surge current when rail exceeds 8.2 V + tolerance. Use Value: Limits peak voltage to safe levels for downstream logic and sensors without adding active circuitry. |
| Signal Level Shifting | Current Source Biasing |
Use Scenario: Translating 3.3 V logic signals to interface with 5 V or 8 V analog subsystems. IC Role / Device Role / Timing Role: Clamp diode establishing upper voltage limit on bidirectional signal lines. Use Value: Prevents overvoltage damage to receivers while preserving signal integrity via low 4.5 Ω ZZT. | Use Scenario: Setting bias current for op-amp input stages or LED driver references. IC Role / Device Role / Timing Role: Stable voltage source defining current through series resistor in constant-current sink. Use Value: Delivers <1% drift over -40°C to +85°C, ensuring consistent LED brightness or sensor excitation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4738A | Same 8.2 V rating but 5% tolerance (A suffix), no RoHS "e3" marking | Acceptable where ±5% regulation suffices and lead-free compliance is not required | Select 1N4738CE3/TR13 when tighter tolerance and RoHS are mandatory; choose 1N4738A for legacy or cost-sensitive non-RoHS designs |
| MMSZ4702ET1G | Surface-mount SOD-123 package, 8.2 V ±5%, 500 mW rating, 10 Ω ZZT | Not drop-in replaceable due to package, power, and impedance differences; suited for space-constrained PCBs | Use MMSZ4702ET1G only in new SMT designs requiring smaller footprint; avoid in through-hole or 1 W thermal environments |
Compared with 1N4738A and MMSZ4702ET1G, the 1N4738CE3/TR13 uniquely combines 2% tolerance, 1 W power rating, DO-41 mechanical robustness, and RoHS compliance-making it optimal for high-reliability through-hole voltage references where precision and regulatory compliance intersect.
Availability
1N4738CE3/TR13 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and signal clamping applications requiring stable component supply across industrial control, automotive subsystems, and embedded instrumentation programs.
Supply support for 1N4738CE3/TR13 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 1N47xxA series was engineered for ruggedized voltage regulation in mission-critical power systems, emphasizing thermal stability, long-term parametric consistency, and extended temperature operation.
FAQ
What is the Zener voltage tolerance of the 1N4738CE3/TR13?
The 1N4738CE3/TR13 has a nominal Zener voltage of 8.2 V with a ±2% tolerance, as indicated by the "C" suffix in the part number. This tighter tolerance enables higher accuracy in voltage reference and regulation circuits compared to standard 5% parts like the 1N4738A. The 1N4738CE3/TR13 is tested at 31 mA and 25 °C ambient per JEDEC standards.
Does the 1N4738CE3/TR13 meet RoHS requirements?
Yes, the 1N4738CE3/TR13 complies with EU RoHS Directive 2011/65/EU. The "e3" suffix denotes RoHS-compliant matte-tin plating on the leads, and the device uses void-free thermosetting epoxy packaging meeting UL94V-0 flammability rating. It is qualified for lead-free reflow soldering up to 260 °C for 10 seconds.
What is the maximum power dissipation for the 1N4738CE3/TR13?
The 1N4738CE3/TR13 is rated for 1.0 W steady-state power dissipation at a lead temperature (TL) below 105 °C with 10 mm lead length from the body. Derating is required above this temperature, following the curve in Figure 1 of the Microsemi datasheet. On FR4 board with specified copper pads, full power is limited to ambient temperatures below 45 °C.
How is polarity marked on the 1N4738CE3/TR13?
The 1N4738CE3/TR13 uses a cathode band to indicate polarity - the banded end is the cathode and must be held at a higher potential than the anode for Zener regulation. When used in forward conduction (e.g., as a clamp), the anode is positive relative to the cathode. The band aligns with standard DO-41 marking conventions and is visible on both radial and axial views.
What is the dynamic impedance of the 1N4738CE3/TR13 and why does it matter?
The 1N4738CE3/TR13 has a maximum dynamic impedance (ZZT) of 4.5 Ω at its 31 mA test current. This low value means the output voltage varies minimally with changes in Zener current - critical for maintaining regulation accuracy in variable-load applications such as feedback references or precision clamps. Lower ZZT directly improves line and load regulation performance.
1N4738CE3/TR13 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:
- ±2%
- 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)
1N4738CE3/TR13 FAQ
1.How can I place an order for 1N4738CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4738CE3/TR13 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 1N4738CE3/TR13 reliable?
The price and inventory of 1N4738CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4738CE3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N4738CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4738CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4738CE3/TR13?
1N4738CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4738CE3/TR13 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 1N4738CE3/TR13?
For technical support, including 1N4738CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4738CE3/TR13 requirements.
6.How does Aetrix verify that 1N4738CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N4738CE3/TR13 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 1N4738CE3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N4738CE3/TR13?
All 1N4738CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4738CE3/TR13, 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 1N4738CE3/TR13 part is unused and in its original packaging.
Return procedure for 1N4738CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4738CE3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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