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Microchip Technology 1N4737CPE3/TR8
- Part No.:
- 1N4737CPE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4737CPE3/TR8.pdf
- Description:
- DIODE ZENER 7.5V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,309
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Product details
Overview
1N4737CPE3/TR8 from Microsemi is a 7.5 V, ±2% tolerance, 1 W silicon 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 provides precision voltage regulation in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N4737CPE3/TR8 datasheet, 1N4737CPE3/TR8 pinout, 1N4737CPE3/TR8 application, or 1N4737CPE3/TR8 equivalent, key selection factors include its tight 2% Zener voltage tolerance (C suffix), RoHS-compliant matte-tin plating (e3), tape-and-reel packaging (TR8), and verified thermal resistance of 45 °C/W junction-to-lead at 10 mm lead length.
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 nominal Zener voltage exhibits low temperature coefficient near zero crossing, with specified knee impedance of 400 Ω at 0.5 mA test current and surge current rating of 605 mA (½-sine, 1/120 s).
The DO-41 package enables axial-leaded through-hole mounting with cathode band polarity marking, and meets IPC/JEDEC J-STD-020B moisture sensitivity Level 1-no dry pack required. Thermal derating begins at 105 °C lead temperature or 45 °C ambient on FR4 board with defined copper pad geometry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±2% at 34 mA - ensures precise reference stability for feedback loops and analog sensing |
| Power Dissipation | 1.0 W at TL < 105 °C - supports continuous regulation without forced cooling in compact layouts |
| Dynamic Impedance (ZZT) | 4.0 Ω at IZT = 34 mA - minimizes output voltage variation under load transients |
| Reverse Leakage (IR) | 5 μA max at VR = 6.0 V - guarantees low quiescent current in standby or battery-backed circuits |
| Thermal Resistance | 45 °C/W junction-to-lead (3/8″ lead length) - enables accurate thermal modeling for reliability prediction |
| Surge Current (ISM) | 605 mA (½-sine, 1/120 s) - withstands short-duration transients in input protection stages |
| Operating Temperature | –65 °C to +150 °C - suitable for automotive under-hood and industrial control environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by colored band; terminals are anode and cathode only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener regulation terminal | Connected to higher potential side during reverse-bias operation; defines regulated output node |
| Anode (unbanded end) | Reference return path | Typically tied to system ground or common rail; completes current path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Reduces calibration overhead in precision reference designs versus standard ±5% parts |
| RoHS-compliant matte-tin plating (e3 suffix) | Enables lead-free reflow soldering per JEDEC J-STD-020 while maintaining solderability |
| Tape-and-reel packaging (TR8 suffix) | Supports automated SMT placement despite axial-leaded form factor via carrier tape indexing |
| Moisture sensitivity Level 1 | Eliminates baking requirement before assembly-reduces manufacturing cost and handling risk |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Permits handling without special ESD controls in standard production environments |
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 serves as shunt voltage reference defining output setpoint. Use Value: Tight 2% tolerance ensures output accuracy within ±0.15 V at 7.5 V, reducing need for post-production trimming. | Use Scenario: Protecting microcontroller I/O pins from transient voltage spikes on sensor inputs. IC Role / Device Role / Timing Role: Clamping element diverting excess energy to ground when input exceeds 7.5 V. Use Value: 605 mA surge rating handles typical ESD events per IEC 61000-4-2 without degradation. |
| Signal Level Shifting | Current Source Biasing |
Use Scenario: Establishing fixed bias point for op-amp input stages operating from single-supply rails. IC Role / Device Role / Timing Role: Provides stable DC offset voltage referenced to ground. Use Value: Low 4.0 Ω dynamic impedance maintains voltage stability even with 1–2 mA signal current variations. | Use Scenario: Setting constant current for LED driver or sensor excitation circuit using series resistor. IC Role / Device Role / Timing Role: Voltage reference enabling predictable current calculation via Ohm's Law. Use Value: Stable 7.5 V reference allows ±2% current accuracy across –40 °C to +85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4737A | Same 7.5 V, ±5% tolerance; no C or e3 suffix - Sn/Pb plating, bulk packaging | Less precise regulation; requires leaded solder process; not RoHS-compliant | Select when cost sensitivity outweighs tolerance and environmental compliance requirements |
| BZX55C7V5 | 7.5 V ±5%, DO-35 glass package, 500 mW rating, different thermal resistance (120 °C/W) | Lower power capability; higher thermal resistance limits sustained current in compact layouts | Select only for low-power, non-RoHS legacy designs where DO-35 footprint is mandated |
Compared with 1N4737A and BZX55C7V5, the 1N4737CPE3/TR8 delivers tighter voltage control, RoHS compliance, and superior thermal performance in DO-41 packaging-making it optimal for new industrial and automotive designs requiring long-term supply continuity and regulatory alignment.
Availability
1N4737CPE3/TR8 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and signal level shifting applications requiring stable component supply, consistent parametric performance, and RoHS-compliant manufacturing.
Supply support for 1N4737CPE3/TR8 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 1N47xxAP series was designed specifically for robust, cost-effective voltage regulation in harsh-environment power systems-emphasizing thermal stability, moisture resilience, and MIL-grade screening compatibility.
FAQ
What is the Zener voltage tolerance of the 1N4737CPE3/TR8?
The 1N4737CPE3/TR8 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in the part number. This means its nominal 7.5 V Zener voltage is guaranteed between 7.35 V and 7.65 V when measured at 34 mA test current and 25 °C lead temperature. This tighter tolerance improves accuracy in reference and feedback applications compared to standard ±5% variants like the 1N4737A.
Is the 1N4737CPE3/TR8 RoHS compliant?
Yes, the 1N4737CPE3/TR8 is RoHS compliant, as confirmed by the "e3" suffix indicating annealed matte-tin plating per JEDEC standards. It meets EU RoHS Directive 2011/65/EU requirements and supports lead-free reflow soldering processes up to 260 °C for 10 seconds. The device is also moisture sensitivity Level 1, eliminating the need for dry-packaging or baking prior to assembly.
What package type does the 1N4737CPE3/TR8 use?
The 1N4737CPE3/TR8 uses the DO-41 (also designated DO-204AL) plastic axial-leaded package. It features a void-free thermosetting epoxy body rated UL94V-0, tin-plated leads, and cathode polarity marked by a visible band. The TR8 suffix confirms tape-and-reel packaging per EIA-296 standard, supporting automated pick-and-place handling despite its through-hole form factor.
What is the maximum power dissipation for the 1N4737CPE3/TR8?
The 1N4737CPE3/TR8 is rated for 1.0 W steady-state power dissipation at a lead temperature (TL) below 105 °C or ambient temperature (TA) below 45 °C when mounted on an FR4 PCB with specified copper pad geometry. Derating is linear above these temperatures, reaching zero watt capability at 175 °C lead temperature. This rating enables reliable operation in unventilated enclosures and high-density power modules.
How does the 1N4737CPE3/TR8 compare to the 1N4737A?
The 1N4737CPE3/TR8 differs from the 1N4737A in three key ways: it adds ±2% voltage tolerance (C), RoHS-compliant matte-tin plating (e3), and tape-and-reel packaging (TR8). The 1N4737A uses Sn/Pb plating, has ±5% tolerance, and ships in bulk. Both share identical electrical specs otherwise-including 7.5 V nominal Zener voltage, 34 mA test current, and DO-41 package-making the 1N4737CPE3/TR8 a drop-in upgrade for new designs requiring tighter regulation and environmental compliance.
1N4737CPE3/TR8 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)
1N4737CPE3/TR8 FAQ
1.How can I place an order for 1N4737CPE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4737CPE3/TR8 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 1N4737CPE3/TR8 reliable?
The price and inventory of 1N4737CPE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4737CPE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4737CPE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4737CPE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4737CPE3/TR8?
1N4737CPE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4737CPE3/TR8 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 1N4737CPE3/TR8?
For technical support, including 1N4737CPE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4737CPE3/TR8 requirements.
6.How does Aetrix verify that 1N4737CPE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4737CPE3/TR8 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 1N4737CPE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4737CPE3/TR8?
All 1N4737CPE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4737CPE3/TR8, 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 1N4737CPE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4737CPE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4737CPE3/TR8 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
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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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