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Microchip Technology 1N4737CPE3/TR12
- Part No.:
- 1N4737CPE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4737CPE3/TR12.pdf
- Description:
- DIODE ZENER 7.5V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,254
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Product details
Overview
1N4737CPE3/TR12 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, used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4737CPE3/TR12 datasheet, 1N4737CPE3/TR12 pinout, 1N4737CPE3/TR12 application, or 1N4737CPE3/TR12 equivalent, key selection criteria include Zener voltage tolerance (±2%), 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 Zener operates in reverse breakdown to maintain stable 7.5 V output across 10 mA to 34 mA regulation current range, with sharp knee characteristics verified by dual-point Zener impedance measurement per MicroNote 202. Its DO-41 axial-leaded plastic package delivers lower thermal resistance than glass-body variants and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack.
Designed for DC voltage reference and shunt regulation, it features 1.2 V forward voltage max at 200 mA, -65 °C to +150 °C operating temperature range, and 260 °C/10 s solderability per MIL-STD-750 Method 2026. Polarity is marked by cathode band; regulation requires banded end positive relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±2% at 34 mA - enables tight-set reference voltage for feedback loops in linear regulators. |
| Power Dissipation | 1.0 W at TL < 105 °C - supports continuous operation with 3/8" lead length heat sinking. |
| Dynamic Impedance (ZZT) | 4.0 Ω at 34 mA - ensures minimal output voltage variation under load transients. |
| Reverse Leakage Current | 5 μA max at 6.0 V - guarantees low quiescent current in standby-mode protection circuits. |
| Surge Current (ISM) | 605 mA peak (½-sine, 1/120 s) - withstands short-duration overvoltage events without degradation. |
| Thermal Resistance | 45 °C/W junction-to-lead - allows direct thermal path to PCB copper or chassis for reliable derating. |
| Operating Temperature | -65 °C to +150 °C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by color band; leads are tin-lead or RoHS-compliant annealed matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or low-side return; reverse-biased during regulation. |
| Cathode | Regulated output node | Banded end; held at stable 7.5 V above anode when reverse current ≥10 mA. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Reduces calibration drift in precision analog references and ADC voltage references. |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with matte-tin plating, no lead or hazardous substances. |
| Tape-and-reel packaging (TR12) | Enables automated SMT-compatible placement despite axial-leaded form factor via carrier tape. |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and bake-out prior to assembly, reducing manufacturing cost. |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands handling without special grounding protocols, simplifying production line logistics. |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in adjustable linear regulators like LM317. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 7.5 V setpoint for error amplifier input. Use Value: Maintains ±2% output accuracy across temperature and line variations due to low ZZT and stable TC. | Use Scenario: Protecting microcontroller I/O pins from transient surges on sensor interface lines. IC Role / Device Role / Timing Role: Bidirectional clamping device limiting voltage to 7.5 V + forward drop during positive transients. Use Value: Absorbs 605 mA surge peaks without failure, preserving downstream logic integrity. |
| Industrial Sensor Excitation | Current Source Biasing |
Use Scenario: Providing stable excitation voltage for resistive bridge sensors in process control transmitters. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source powering Wheatstone bridges. Use Value: Delivers <10 ppm/°C TC stability and <5 μA leakage, minimizing zero-shift errors. | Use Scenario: Setting bias current for constant-current LED drivers or op-amp input stages. IC Role / Device Role / Timing Role: Precision current-setting element in two-terminal shunt regulator topology. Use Value: Enables accurate 34 mA regulation current with 4.0 Ω dynamic impedance for predictable gain. |
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 nominal, but ±5% tolerance (A suffix) vs. ±2% (C suffix) | Acceptable where tighter regulation not required; higher unit cost for C-grade unnecessary | Select 1N4737A for cost-sensitive non-precision designs with looser voltage budget |
| BZX55-C7V5 | Same 7.5 V ±2%, but 500 mW power rating and DO-35 package; higher ZZT (10 Ω) | Not suitable for 1 W continuous dissipation; limited surge capability (300 mA) | Choose BZX55-C7V5 only for low-power signal-level clamping with space-constrained layouts |
Compared with 1N4737A and BZX55-C7V5, the 1N4737CPE3/TR12 offers superior thermal performance (45 °C/W vs. >100 °C/W), higher surge margin (605 mA vs. ≤300 mA), and guaranteed ±2% tolerance-making it optimal for industrial power regulation where reliability and precision coexist.
Availability
1N4737CPE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning, and overvoltage protection circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4737CPE3/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 1N47xx series was engineered for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, ESD immunity, and long-term parametric stability under extended temperature cycling.
FAQ
What is the Zener voltage tolerance of the 1N4737CPE3/TR12?
The 1N4737CPE3/TR12 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in the part number. This means its regulated voltage remains within 7.35 V to 7.65 V at 34 mA test current and 25 °C lead temperature, making it suitable for precision reference applications where tighter regulation is required compared to standard ±5% parts like the 1N4737A.
Does the 1N4737CPE3/TR12 require dry packing before reflow soldering?
No, the 1N4737CPE3/TR12 does not require dry packing. It is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ambient conditions without baking or humidity-controlled packaging prior to assembly-reducing manufacturing overhead and eliminating risk of popcorning during reflow.
What is the maximum surge current rating for the 1N4737CPE3/TR12?
The 1N4737CPE3/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 value reflects its ability to absorb transient overvoltage energy without permanent degradation, supporting robust overvoltage clamp functionality in industrial interfaces.
How is polarity marked on the 1N4737CPE3/TR12?
The 1N4737CPE3/TR12 uses a cathode band to indicate polarity: the banded end is the cathode and must be held positive relative to the anode for proper Zener regulation. During forward conduction, the anode is positive; in reverse breakdown (regulation mode), the cathode is the regulated output node referenced to the anode ground.
Is the 1N4737CPE3/TR12 RoHS compliant?
Yes, the 1N4737CPE3/TR12 is RoHS compliant, as confirmed by the "e3" suffix in its part number. It features RoHS-compliant annealed matte-tin plating on leads and void-free thermosetting epoxy body meeting UL94V-0, satisfying EU Directive 2011/65/EU requirements for restriction of hazardous substances.
1N4737CPE3/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)
1N4737CPE3/TR12 FAQ
1.How can I place an order for 1N4737CPE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4737CPE3/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 1N4737CPE3/TR12 reliable?
The price and inventory of 1N4737CPE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4737CPE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4737CPE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4737CPE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4737CPE3/TR12?
1N4737CPE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4737CPE3/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 1N4737CPE3/TR12?
For technical support, including 1N4737CPE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4737CPE3/TR12 requirements.
6.How does Aetrix verify that 1N4737CPE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4737CPE3/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 1N4737CPE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4737CPE3/TR12?
All 1N4737CPE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4737CPE3/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 1N4737CPE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4737CPE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4737CPE3/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
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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