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Microchip Technology 1N4737CP/TR12
- Part No.:
- 1N4737CP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4737CP/TR12.pdf
- Description:
- DIODE ZENER 7.5V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,678
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Product details
Overview
1N4737CP/TR12 from Microsemi is a 1.0 W plastic-encapsulated Zener diode with nominal zener voltage 7.5 V ±5%, 34 mA test current (IZT), 4.0 Ω dynamic impedance (ZZT), and maximum reverse current 5 μA at 6.0 V (VR). It operates from –65°C to +150°C and is used for precision voltage regulation in power supply reference, overvoltage protection, and biasing circuits.
For engineers reviewing the 1N4737CP/TR12 datasheet, 1N4737CP/TR12 pinout, 1N4737CP/TR12 application, or 1N4737CP/TR12 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (45 °C/W junction-to-lead), surge current rating (605 mA), RoHS-compliant "e3" plating, and tape-and-reel packaging (TR12).
Technical Context
This axial-lead Zener diode regulates voltage via reverse-biased avalanche breakdown, with sharp knee characteristics verified by dual-point impedance measurement per MicroNote 202. Its DO-41 (DO-204AL) package provides 45 °C/W junction-to-lead thermal resistance at 10 mm lead length and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack.
The device features cathode band polarity marking, tin-lead or matte-tin plating compliant with MIL-STD-750 Method 2026, and UL94V-0 void-free epoxy encapsulation. It delivers stable regulation across 1 mA to 605 mA operating current range with <100 ppm/°C temperature coefficient near 7.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% at IZT = 34 mA - defines nominal regulation point with tight production control |
| Power Dissipation | 1.0 W at TL ≤ 105°C - limits continuous operation on FR4 board unless derated above 45°C ambient |
| Dynamic Impedance (ZZT) | 4.0 Ω at IZT = 34 mA - ensures low output impedance for stable reference under load variation |
| Reverse Leakage (IR) | 5 μA max at VR = 6.0 V - guarantees minimal quiescent current in standby regulation mode |
| Surge Current (ISM) | 605 mA peak (½-sine, 1/120 s) - supports transient overvoltage clamping without degradation |
| Thermal Resistance | 45 °C/W junction-to-lead - enables direct thermal path to PCB copper or heatsink via 10 mm leads |
| Operating Temperature | –65°C to +150°C - suitable for industrial and automotive under-hood environments |
Pinout & Package
Package: DO-41 (JEDEC DO-204AL), axial-lead plastic molded case with cathode band marking. 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; forward voltage ≤1.2 V @ 200 mA |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to unregulated input; maintains 7.5 V relative to anode under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Guarantees mechanical and electrical interchangeability with legacy 1N4737A designs |
| P-suffix plastic construction | Reduces thermal resistance vs. glass-body G-suffix variants, improving power handling at same footprint |
| e3 RoHS-compliant plating | Enables lead-free assembly without requalification; annealed matte-tin ensures solder wetting reliability |
| Tape-and-reel packaging (TR12) | Supports automated SMT placement despite axial form factor-requires carrier tape conversion |
| MIL-STD-750 ESD immunity | Nonsensitive to electrostatic discharge per Method 1020, eliminating need for special handling in assembly |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stable 7.5 V reference for linear regulator feedback or ADC reference buffer. IC Role / Device Role / Timing Role: Zener diode providing shunt-regulated voltage reference node. Use Value: Delivers 7.5 V ±5% with 4.0 Ω dynamic impedance, minimizing reference drift under load changes. | Use Scenario: Clamping transient spikes on 12 V rail in automotive body control modules. IC Role / Device Role / Timing Role: Shunt protector diverting surge current above 7.5 V threshold. Use Value: Withstands 605 mA surge (½-sine, 1/120 s), preventing downstream IC damage during load dump. |
| Biasing Circuit | Current Source Stabilization |
Use Scenario: Setting gate bias voltage for MOSFET driver stage in DC-DC converter. IC Role / Device Role / Timing Role: Zener-based voltage source establishing fixed gate drive level. Use Value: Maintains 7.5 V regulation across –65°C to +150°C, ensuring consistent MOSFET turn-on threshold. | Use Scenario: Stabilizing constant-current source for LED string in industrial lighting. IC Role / Device Role / Timing Role: Shunt element defining compliance voltage of current mirror or op-amp loop. Use Value: Low 4.0 Ω ZZT minimizes current error due to supply ripple, improving LED brightness uniformity. |
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 "P" suffix → glass-body DO-35 package; higher thermal resistance (105 °C/W junction-to-ambient) | Lower power density; unsuitable for high-temperature PCB mounting without heatsinking | Select 1N4737CP/TR12 when thermal performance or RoHS compliance is required |
| MMSZ4705T1G | Surface-mount SOD-123 package; 7.5 V ±5%; 1.0 W rating; 5.0 Ω ZZT; 10 μA IR @ 6.0 V | Requires PCB layout change; lacks axial-leaded mechanical robustness for high-vibration environments | Select 1N4737CP/TR12 for through-hole assembly, thermal management via leads, or legacy footprint compatibility |
Compared with 1N4737A and MMSZ4705T1G, the 1N4737CP/TR12 offers superior thermal conduction via DO-41 leads, RoHS-compliant plating, and tape-and-reel automation support-making it optimal for industrial power supplies requiring long-term reliability and assembly flexibility.
Availability
1N4737CP/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and biasing circuits requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for 1N4737CP/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N4737CP/TR12 belongs to Microsemi's legacy 1N47xxAP Zener diode family, engineered for precision voltage regulation in harsh-environment power systems where stability, thermal resilience, and JEDEC-standard interchangeability are critical.
FAQ
What is the zener voltage tolerance of the 1N4737CP/TR12?
The 1N4737CP/TR12 has a nominal zener voltage of 7.5 V with a ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This tolerance is verified at 34 mA test current and 25°C lead temperature, ensuring predictable regulation across production lots and operating conditions.
Does the 1N4737CP/TR12 meet RoHS requirements?
Yes, the 1N4737CP/TR12 is RoHS compliant, confirmed by the "e3" suffix in its full manufacturer part number. It uses annealed matte-tin plating per MIL-STD-750 Method 2026 and void-free UL94V-0 epoxy encapsulation, satisfying EU Directive 2011/65/EU and related exemptions.
What is the maximum surge current rating for the 1N4737CP/TR12?
The 1N4737CP/TR12 has a maximum surge current (ISM) rating of 605 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25°C ambient. This rating enables reliable transient clamping in automotive and industrial power rails without permanent parameter shift.
How does the DO-41 package of the 1N4737CP/TR12 affect thermal performance?
The DO-41 (DO-204AL) package of the 1N4737CP/TR12 achieves 45 °C/W junction-to-lead thermal resistance at 10 mm lead length, significantly better than the 105 °C/W junction-to-ambient rating on FR4. This allows direct heat conduction to chassis or copper pours, supporting full 1.0 W dissipation at lower ambient temperatures.
Can the 1N4737CP/TR12 replace the older 1N4737A in existing designs?
Yes, the 1N4737CP/TR12 is a direct replacement for the 1N4737A in most applications, retaining identical electrical specifications and JEDEC pinout. The "P" suffix denotes plastic encapsulation with improved thermal resistance, while "TR12" adds tape-and-reel packaging-no PCB changes are needed for drop-in use.
1N4737CP/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:
- ±2%
- 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)
1N4737CP/TR12 FAQ
1.How can I place an order for 1N4737CP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4737CP/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 1N4737CP/TR12 reliable?
The price and inventory of 1N4737CP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4737CP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4737CP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4737CP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4737CP/TR12?
1N4737CP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4737CP/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 1N4737CP/TR12?
For technical support, including 1N4737CP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4737CP/TR12 requirements.
6.How does Aetrix verify that 1N4737CP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4737CP/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 1N4737CP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4737CP/TR12?
All 1N4737CP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4737CP/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 1N4737CP/TR12 part is unused and in its original packaging.
Return procedure for 1N4737CP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4737CP/TR12 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
Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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