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Microchip Technology 1N4737PE3/TR12
- Part No.:
- 1N4737PE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4737PE3/TR12.pdf
- Description:
- DIODE ZENER 7.5V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,393
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Product details
Overview
1N4737PE3/TR12 from Microsemi is a 1.0 W, 7.5 V ±5% axial-lead silicon Zener diode in DO-41 (DO-204AL) plastic package, rated for -65°C to +150°C operation, with 34 mA test current, 4.0 Ω dynamic impedance at IZT, and 5 µA maximum reverse leakage at 6.0 V. It provides stable voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4737PE3/TR12 datasheet, 1N4737PE3/TR12 pinout, 1N4737PE3/TR12 application, or 1N4737PE3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45°C/W junction-to-lead), surge current rating (605 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging per EIA-296.
Technical Context
This device operates in reverse breakdown to maintain a stable 7.5 V reference across a wide current range (0.25 mA to 605 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 1N4737PE3/TR12 exhibits a nominal temperature coefficient near zero (±0.0005%/°C typical for 7.5 V devices), supports 260°C/10 s soldering, and features cathode band polarity marking. It is rated for 1.0 W steady-state dissipation at TL < 105°C (3/8″ lead length) or TA < 45°C on FR4 with defined copper pad geometry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% at 34 mA - defines precise regulation point under standard test conditions |
| Power Dissipation | 1.0 W at TL < 105°C - sets maximum continuous thermal load with 3/8″ lead length |
| Dynamic Impedance (ZZT) | 4.0 Ω at 34 mA - indicates low AC impedance for stable regulation under varying load |
| Reverse Leakage (IR) | 5 µA max at 6.0 V - ensures minimal quiescent current in standby or sensing applications |
| Surge Current (ISM) | 605 mA (½-sine, 1/120 s) - supports transient overvoltage clamping without failure |
| Thermal Resistance | 45 °C/W junction-to-lead - enables accurate thermal design with standard lead mounting |
| Operating Temperature | -65°C to +150°C - suitable for industrial, automotive, and aerospace environments |
Pinout & Package
Package: DO-41 (JEDEC DO-204AL), axial-lead plastic molded case with void-free UL94V-0 epoxy body, cathode indicated by colored band, tin-lead or RoHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Banded end; connected to regulated voltage rail; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant "e3" suffix | Matte-tin plating per MIL-STD-750 Method 2026, eliminating lead while maintaining solderability |
| Tape-and-reel packaging | EIA-296 compliant carrier tape (TR12 suffix), enabling automated SMT-compatible placement despite axial form factor |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies handling and storage logistics |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD controls in assembly |
| Plastic vs. glass thermal advantage | Lower junction-to-lead thermal resistance (45°C/W vs. higher for G-suffix glass) improves power handling reliability |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Zener diode acting as precision shunt reference for error amplifier input. Use Value: Delivers 7.5 V ±5% regulation with 4.0 Ω dynamic impedance, minimizing output drift under load variation. |
Use Scenario: Protecting microcontroller I/O pins or sensor inputs from transient voltage spikes. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage to 7.5 V during ESD or inductive kick events. Use Value: Absorbs 605 mA surge current (½-sine, 1/120 s) without degradation, preserving downstream circuit integrity. |
| DC-DC Converter Feedback | Industrial Sensor Excitation |
|
Use Scenario: Setting output voltage in isolated flyback or forward converter secondary-side regulation. IC Role / Device Role / Timing Role: Primary shunt reference in optocoupler-coupled feedback loop. Use Value: Stable 7.5 V reference across -65°C to +150°C enables reliable closed-loop control in harsh environments. |
Use Scenario: Providing stable excitation voltage to resistive bridge sensors (e.g., strain gauges, RTDs) in process instrumentation. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source for ratiometric measurement accuracy. Use Value: 5 µA max reverse leakage at 6.0 V minimizes error contribution in high-impedance sensor bias networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4737A | No "e3" RoHS suffix; Sn/Pb plating; same electrical specs and DO-41 package | Not compliant with RoHS Directive 2011/65/EU; requires leaded solder process | Select when legacy Pb-based assembly is mandated and environmental compliance is not required |
| MMSZ4705ET1G | Surface-mount SOD-123 package; 7.5 V ±5%; 350 mW rating; 30 mA IZT | Lower power rating and different thermal profile; unsuitable for 1 W continuous operation | Choose only for space-constrained PCBs where 350 mW derated performance is acceptable |
Compared with 1N4737A and MMSZ4705ET1G, the 1N4737PE3/TR12 uniquely combines full 1 W power capability, RoHS compliance, axial-lead manufacturability, and JEDEC-standard DO-41 mechanical compatibility-making it optimal for through-hole industrial power rails requiring long-term regulatory and thermal reliability.
Availability
1N4737PE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and test equipment requiring stable component supply with RoHS compliance and tape-and-reel automation support.
Supply support for 1N4737PE3/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 1N4737PE3/TR12 belongs to Microsemi's legacy 1N47xxAP Zener series, engineered for robust voltage regulation in mission-critical power conditioning and protection circuits where thermal stability and long-term parametric consistency are essential.
FAQ
What is the Zener voltage tolerance of the 1N4737PE3/TR12?
The 1N4737PE3/TR12 has a nominal Zener voltage of 7.5 V with a ±5% tolerance, as confirmed by the "A" suffix in its base part number (1N4737A) and documented in Microsemi's REV C datasheet. This tolerance applies at 34 mA test current and 25°C lead temperature, and is maintained across the full operating temperature range of -65°C to +150°C.
Does the 1N4737PE3/TR12 require dry packing before use?
No, the 1N4737PE3/TR12 does not require dry packing. It is classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B due to its void-free plastic encapsulation, meaning it can be stored and assembled without baking or humidity-controlled handling-reducing manufacturing overhead and risk of popcorning.
What is the maximum surge current rating for the 1N4737PE3/TR12?
The 1N4737PE3/TR12 is rated for a maximum non-repetitive reverse surge current (ISM) of 605 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 line protection and ESD clamp applications without permanent parameter shift.
How does the "e3" suffix affect the 1N4737PE3/TR12's plating and solderability?
The "e3" suffix on the 1N4737PE3/TR12 indicates RoHS-compliant annealed matte-tin plating per MIL-STD-750 Method 2026. This finish provides equivalent solderability to traditional Sn/Pb plating at 260°C for 10 seconds, with no intermetallic growth concerns, and eliminates lead content while meeting global environmental regulations.
Can the 1N4737PE3/TR12 be used in surface-mount designs?
The 1N4737PE3/TR12 is an axial-lead DO-41 device and is not designed for direct surface-mount assembly. However, its TR12 tape-and-reel packaging supports automated pick-and-place insertion into through-hole pads. For true SMT implementation, Microsemi offers the SMAJ4737A or MLL4737A as surface-mount equivalents-not drop-in replacements but functionally aligned alternatives.
1N4737PE3/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):
- 7.5 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 4 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 5 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)
1N4737PE3/TR12 FAQ
1.How can I place an order for 1N4737PE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4737PE3/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 1N4737PE3/TR12 reliable?
The price and inventory of 1N4737PE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4737PE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4737PE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4737PE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4737PE3/TR12?
1N4737PE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4737PE3/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 1N4737PE3/TR12?
For technical support, including 1N4737PE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4737PE3/TR12 requirements.
6.How does Aetrix verify that 1N4737PE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4737PE3/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 1N4737PE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4737PE3/TR12?
All 1N4737PE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4737PE3/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 1N4737PE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4737PE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4737PE3/TR12 Tags
-
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
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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