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Microchip Technology 1N4737P/TR12
- Part No.:
- 1N4737P/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4737P/TR12.pdf
- Description:
- DIODE ZENER 7.5V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,973
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Product details
Overview
1N4737P/TR12 from Microsemi is a 1.0 W axial-lead silicon Zener diode with nominal Zener voltage of 7.5 V ±5%, 34 mA test current (IZT), 4.0 Ω dynamic impedance (ZZT), and maximum reverse current of 5 μA at 6.0 V (VR). It regulates voltage in power supply reference, overvoltage protection, and voltage-clamping circuits across industrial temperature range.
For engineers reviewing the 1N4737P/TR12 datasheet, 1N4737P/TR12 pinout, 1N4737P/TR12 application, or 1N4737P/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 DO-41 package compatibility with standard axial-lead PCB layouts.
Technical Context
This device operates in reverse-biased breakdown mode to maintain stable output voltage under varying load and line conditions. Its 7.5 V regulation point targets mid-range analog reference and feedback-sensing applications where ±5% tolerance and low knee impedance (121 Ω at IZK = 0.5 mA) ensure predictable clamping behavior.
The DO-41 plastic package delivers 45 °C/W junction-to-lead thermal resistance at 3/8″ lead length and supports 1.0 W steady-state dissipation up to 105 °C lead temperature. Polarity is marked by cathode band; operation requires cathode positive relative to anode for Zener conduction.
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 rails |
| Power Dissipation | 1.0 W at TL < 105 °C - sets maximum continuous thermal load on lead-mounted layout |
| Dynamic Impedance (ZZT) | 4.0 Ω at IZT = 34 mA - determines output voltage variation under load transients |
| Reverse Leakage (IR) | 5 μA max at VR = 6.0 V - ensures minimal quiescent current in standby clamp circuits |
| Surge Current (ISM) | 605 mA peak (½-sine, 1/120 s) - defines transient overvoltage handling capability |
| Thermal Resistance | 45 °C/W junction-to-lead - enables thermal design with known lead-length derating |
| Operating Temp | –65 °C to +150 °C - supports deployment in automotive engine compartments and industrial controls |
Pinout & Package
DO-41 (DO-204AL) plastic axial-lead package with cathode indicated by colored band; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node; reverse bias applied between cathode and anode for regulation |
| Cathode | Zener breakdown terminal | Banded end; must be held positive relative to anode to activate Zener conduction and voltage regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxAP registration | Ensures mechanical and electrical interchangeability with legacy 1N4737A designs using plastic DO-41 housing |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for SMT-compatible handling |
| RoHS-compliant "e3" suffix | Confirms lead-free annealed matte-tin plating meeting JEDEC J-STD-020B and EU Directive 2011/65/EU |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - no special handling needed during assembly or testing |
| Tape-and-reel packaging | TR12 suffix denotes EIA-296-compliant 12 mm tape carrier for automated pick-and-place placement |
Applications
| Power Supply Reference | Voltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or op-amp-based shunt regulators. IC Role / Device Role / Timing Role: Provides fixed 7.5 V reference to control output voltage accuracy and line/load regulation. Use Value: ±5% VZ tolerance and 4.0 Ω ZZT enable <±1% output drift over 10–100 mA load range. | Use Scenario: Limiting transient overvoltage on microcontroller I/O lines or sensor inputs. IC Role / Device Role / Timing Role: Shunts excess energy above 7.5 V to ground before downstream circuit damage occurs. Use Value: 605 mA surge rating and 121 Ω knee impedance ensure reliable clamping without thermal runaway. |
| Industrial Sensor Excitation | Automotive Body Control Module |
Use Scenario: Supplying stable excitation voltage to resistive bridge sensors (e.g., pressure, strain gauges). IC Role / Device Role / Timing Role: Acts as precision voltage source for ratiometric measurement systems requiring low-drift references. Use Value: –65 °C to +150 °C operating range and 0.05%/°C tempco support operation in unregulated engine bay environments. | Use Scenario: Regulating auxiliary 7.5 V rail for LIN transceivers or LED drivers in BCM subassemblies. IC Role / Device Role / Timing Role: Maintains stable bias under battery voltage fluctuations (9–16 V) and load dump events. Use Value: 1.0 W power rating and DO-41 mechanical robustness withstand repeated thermal cycling and vibration stress. |
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 (60 °C/W vs. 45 °C/W) | Less suitable for high-power-density layouts due to inferior heat dissipation | Select 1N4737P/TR12 when board space or thermal management favors plastic DO-41 |
| MMSZ4705T1G | Surface-mount SOD-123; 7.5 V ±5%, 30 mA IZT, 5.0 Ω ZZT; rated 500 mW | Not drop-in compatible - requires re-layout; limited surge current (300 mA) | Choose MMSZ4705T1G only for space-constrained PCBs where 1N4737P/TR12's axial form factor is prohibitive |
Compared with 1N4737A and MMSZ4705T1G, the 1N4737P/TR12 offers superior thermal performance in through-hole designs and higher surge resilience than SMD alternatives, making it optimal for industrial power rails and ruggedized clamping where reliability under thermal stress is critical.
Availability
1N4737P/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and sensor interface modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4737P/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 1N47xxAP series was designed specifically for general-purpose voltage regulation in cost-sensitive, high-volume applications where JEDEC-standardized performance, moisture-insensitive packaging, and RoHS compliance are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N4737P/TR12?
The 1N4737P/TR12 has a nominal Zener voltage of 7.5 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This tolerance is verified at 34 mA test current and 25 °C lead temperature. The 1N4737P/TR12 maintains this specification across its full operating temperature range of –65 °C to +150 °C, supporting stable regulation in demanding environments.
Does the 1N4737P/TR12 require dry packing before PCB assembly?
No, the 1N4737P/TR12 is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it has unlimited floor life and does not require dry packing or baking prior to assembly. Its void-free thermosetting epoxy body and RoHS-compliant matte-tin plating ensure robust solderability without moisture-related popcorning risks during reflow or wave soldering.
What is the maximum surge current rating for the 1N4737P/TR12?
The 1N4737P/TR12 has a maximum non-repetitive surge current (ISM) of 605 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating applies to transient overvoltage events such as load dump or ESD-induced spikes. The 1N4737P/TR12 sustains this surge without parameter shift when mounted with proper lead length and thermal relief.
How does the "TR12" suffix affect packaging and handling of the 1N4737P/TR12?
The "TR12" suffix indicates EIA-296-compliant tape-and-reel packaging in 12 mm carrier tape, optimized for automated surface-mount assembly equipment. Each reel contains standard quantities for high-volume production. The 1N4737P/TR12 retains its full DO-41 mechanical dimensions and electrical specs; the TR12 format only affects logistics and placement-not performance or compatibility.
Is the 1N4737P/TR12 RoHS compliant?
Yes, the 1N4737P/TR12 carries the "e3" designation confirming RoHS compliance per EU Directive 2011/65/EU. Its terminations use annealed matte-tin plating instead of tin-lead, and its transfer-molded epoxy body meets UL94V-0 flammability requirements. All materials and processes for the 1N4737P/TR12 are fully documented and traceable through Microsemi's certified supply chain.
1N4737P/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)
1N4737P/TR12 FAQ
1.How can I place an order for 1N4737P/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4737P/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 1N4737P/TR12 reliable?
The price and inventory of 1N4737P/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4737P/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4737P/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4737P/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4737P/TR12?
1N4737P/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4737P/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 1N4737P/TR12?
For technical support, including 1N4737P/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4737P/TR12 requirements.
6.How does Aetrix verify that 1N4737P/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4737P/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 1N4737P/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4737P/TR12?
All 1N4737P/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4737P/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 1N4737P/TR12 part is unused and in its original packaging.
Return procedure for 1N4737P/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4737P/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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