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Microchip Technology 1N4737APE3/TR12
- Part No.:
- 1N4737APE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4737APE3/TR12.pdf
- Description:
- DIODE ZENER 7.5V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:5,469
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Product details
Overview
1N4737APE3/TR12 from Microsemi is a 1.0 W, 7.5 V ±5% axial-lead Zener diode in DO-41 plastic package, rated for 34 mA test current, 4.0 Ω dynamic impedance at IZT, and 5 μA reverse leakage at 6.0 V. It delivers stable voltage regulation in power supply reference, overvoltage protection, and biasing circuits across -65°C to +150°C.
For engineers reviewing the 1N4737APE3/TR12 datasheet, 1N4737APE3/TR12 pinout, 1N4737APE3/TR12 application, or 1N4737APE3/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 discrete Zener diode operates in reverse breakdown to maintain a stable 7.5 V reference across a wide current range (1.0 mA to 34 mA), with low dynamic impedance ensuring minimal voltage variation under load transients. Its DO-41 plastic encapsulation provides Level 1 moisture sensitivity and eliminates dry-pack requirements per IPC/JEDEC J-STD-020B.
The device features a cathode band marking, tin-lead or RoHS-compliant annealed matte-tin terminals solderable per MIL-STD-750 Method 2026, and is rated for 260°C/10 s soldering. Thermal performance is specified at 3/8" lead length (45°C/W) and on FR4 board (105°C/W), supporting reliable operation in industrial and embedded power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% at 34 mA - defines precise regulation point for feedback loops and reference generation |
| Power Dissipation | 1.0 W at 25°C - sets maximum continuous DC power handling before thermal derating applies |
| Dynamic Impedance (ZZT) | 4.0 Ω at 34 mA - determines output voltage stability under varying load current |
| Reverse Leakage Current | 5 μA max at 6.0 V - ensures low quiescent current in standby or high-impedance sensing nodes |
| Surge Current (ISM) | 605 mA peak - supports transient overvoltage clamping without failure |
| Thermal Resistance | 45°C/W junction-to-lead - enables accurate junction temperature estimation for reliability analysis |
| Operating Temperature | -65°C to +150°C - qualifies for automotive under-hood, industrial control, and aerospace environments |
Pinout & Package
Package: DO-41 (DO-204AL) plastic molded thermosetting epoxy case, void-free, UL94V-0 rated, with axial leads and cathode band marking. Weight: 0.7 g.
| 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 rail or error amplifier input in feedback networks |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N4737A series | Ensures cross-manufacturer compatibility and standardized test conditions per industry baseline |
| RoHS-compliant "e3" suffix | Matte-tin plating meets EU Directive 2011/65/EU and China RoHS II without lead or exemptions |
| Tape-and-reel "TR12" packaging | Standard EIA-296 compliant reel (12 mm tape width) for automated SMT placement compatibility |
| Moisture Sensitivity Level 1 | No dry pack required prior to assembly-reduces handling cost and process steps |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020-enables safe handling in standard production environments |
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 7.5 V threshold for error amplification. Use Value: Maintains ±5% output accuracy over temperature and line/load variations due to low ZZT and tight VZ tolerance. | Use Scenario: Clamping transient spikes on 5–12 V DC rails in motor drives or sensor interfaces. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground when voltage exceeds 7.5 V. Use Value: Withstands 605 mA surge current and operates reliably from -65°C to +150°C in harsh environments. |
| Biasing Network | Signal Level Translation |
Use Scenario: Establishing stable DC operating points for op-amps, comparators, or RF amplifiers. IC Role / Device Role / Timing Role: Precision voltage source setting gate/base bias in analog front-end stages. Use Value: Low 5 μA leakage at 6.0 V minimizes error in high-impedance bias networks. | Use Scenario: Translating logic-level signals between 3.3 V and 5 V domains using passive level-shifting topologies. IC Role / Device Role / Timing Role: Clamp diode defining upper voltage limit in bidirectional level-shift circuits. Use Value: Sharp knee impedance (ZZK = 0.5 Ω at 0.25 mA) ensures clean transition and minimal signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4737A-T | Same 7.5 V ±5%, DO-41, but non-RoHS tin-lead plating and bulk packaging | Lacks e3 RoHS compliance and TR12 tape-and-reel; suitable only for legacy or exempted programs | Select when RoHS exemption applies and automated placement is not required |
| MMSZ4705T1G | Surface-mount SOD-123, 7.5 V ±5%, 500 mW, 30 mA IZT, higher ZZT (15 Ω) | Lower power rating and different thermal profile; requires PCB layout change | Choose for space-constrained designs where 1 W dissipation is unnecessary |
Compared with 1N4737A-T and MMSZ4705T1G, the 1N4737APE3/TR12 offers full RoHS compliance, tape-and-reel readiness for high-volume assembly, and superior 1.0 W power handling with lower dynamic impedance-making it optimal for industrial power rails requiring long-term stability and regulatory alignment.
Availability
1N4737APE3/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and biasing networks requiring stable component supply, consistent RoHS compliance, and automated assembly support.
Supply support for 1N4737APE3/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 radiation-hardened components for aerospace, defense, and industrial markets.
The 1N4737APE3/TR12 belongs to Microsemi's legacy 1N47xxAP Zener family, engineered for robust voltage regulation in mission-critical power systems where thermal stability, ESD immunity, and long-term parametric consistency are essential.
FAQ
What is the Zener voltage tolerance of the 1N4737APE3/TR12?
The 1N4737APE3/TR12 has a nominal Zener voltage of 7.5 V with a ±5% tolerance, as indicated by the "A" suffix per JEDEC registration. This tolerance is guaranteed at 34 mA test current and 25°C lead temperature, enabling predictable performance in feedback and reference circuits without requiring post-production trimming.
Does the 1N4737APE3/TR12 require dry packing before reflow?
No, the 1N4737APE3/TR12 is moisture sensitivity level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored and assembled without dry packing or baking. Its DO-41 plastic encapsulation is void-free and UL94V-0 rated, eliminating moisture-related popcorning risk during standard reflow profiles.
What is the maximum surge current rating for the 1N4737APE3/TR12?
The 1N4737APE3/TR12 is rated for a peak 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 supports transient clamping in industrial power supplies and motor drive protection circuits without degradation.
How does the thermal resistance of the 1N4737APE3/TR12 affect its power derating?
The 1N4737APE3/TR12 has a junction-to-lead thermal resistance of 45°C/W at 3/8" lead length. At ambient temperatures above 45°C on FR4 board or lead temperatures above 105°C, its 1.0 W power rating must be linearly derated-ensuring safe operation while maintaining regulation accuracy in thermally constrained enclosures.
Is the 1N4737APE3/TR12 compatible with lead-free soldering processes?
Yes, the 1N4737APE3/TR12 features RoHS-compliant annealed matte-tin plating qualified per MIL-STD-750 Method 2026 and supports lead-free reflow up to 260°C for 10 seconds. Its plastic body withstands repeated thermal cycling without delamination or parameter shift, making it suitable for modern Pb-free manufacturing lines.
1N4737APE3/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:
- ±5%
- 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)
1N4737APE3/TR12 FAQ
1.How can I place an order for 1N4737APE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4737APE3/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 1N4737APE3/TR12 reliable?
The price and inventory of 1N4737APE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4737APE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4737APE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4737APE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4737APE3/TR12?
1N4737APE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4737APE3/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 1N4737APE3/TR12?
For technical support, including 1N4737APE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4737APE3/TR12 requirements.
6.How does Aetrix verify that 1N4737APE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4737APE3/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 1N4737APE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4737APE3/TR12?
All 1N4737APE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4737APE3/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 1N4737APE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4737APE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4737APE3/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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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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