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Microchip Technology 1N4737APE3/TR8
- Part No.:
- 1N4737APE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4737APE3/TR8.pdf
- Description:
- DIODE ZENER 7.5V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,317
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Product details
Overview
1N4737APE3/TR8 from Microsemi is a 1.0 W, 7.5 V ±5% 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 stable voltage regulation in power supply reference, overvoltage protection, and biasing circuits operating from -65°C to +150°C.
For engineers reviewing the 1N4737APE3/TR8 datasheet, 1N4737APE3/TR8 pinout, 1N4737APE3/TR8 application, or 1N4737APE3/TR8 equivalent, key selection factors include its 7.5 V nominal Zener voltage, 1.0 W power rating at 25°C with 45°C/W junction-to-lead thermal resistance, RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR8) for automated assembly.
Technical Context
This device operates in reverse breakdown to maintain a stable 7.5 V reference across a wide current range (0.25 mA to 605 mA), 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.
The 1N4737APE3/TR8 exhibits a temperature coefficient near zero (±2 mV/°C typical for 7.5 V devices), enabling stable regulation across industrial temperature extremes. It is nonsensitive to ESD per MIL-STD-750 Method 1020 and supports soldering at 260°C for 10 s, making it suitable for reflow and wave-soldered PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% at 34 mA - defines precise regulation point for reference and clamp circuits |
| Power Dissipation | 1.0 W at TL < 105°C (3/8″ lead length) - sets maximum continuous DC power under defined thermal conditions |
| Dynamic Impedance (ZZT) | 4.0 Ω at 34 mA - ensures low AC output impedance for ripple suppression in regulated supplies |
| Reverse Leakage Current | 5 μA max at 6.0 V - guarantees minimal standby power loss in high-impedance bias networks |
| Thermal Resistance | 45°C/W junction-to-lead - enables accurate thermal design when leads serve as primary heat path |
| Operating Temperature | -65°C to +150°C - supports deployment in automotive engine bays and industrial control enclosures |
| Forward Voltage | 1.2 V max at 200 mA - confirms standard silicon diode conduction behavior for polarity verification |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by color band; terminals are unmarked anode and banded cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward conduction path during testing or fault conditions |
| Cathode | Banded end | Connected to higher-potential node; Zener breakdown occurs with cathode positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N4737A series | Ensures global interchangeability and standardized test methodology across manufacturers |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin plating, eliminating lead-based solder concerns |
| Level 1 moisture sensitivity | Allows indefinite floor life without dry-packaging or baking prior to assembly |
| Nonsensitive to ESD | Withstands handling per MIL-STD-750 Method 1020 without parameter shift or failure |
| Tape-and-reel packaging (TR8) | Enables high-speed pick-and-place placement with EIA-296 standard carrier tape geometry |
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: Voltage reference element establishing precise output setpoint. Use Value: Delivers 7.5 V ±5% regulation with 4.0 Ω dynamic impedance, minimizing load-induced output drift. | Use Scenario: Protecting microcontroller I/O pins from transient voltage spikes on sensor or communication lines. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess energy to ground above 7.5 V. Use Value: Responds within nanoseconds to transients up to 605 mA peak surge current (ISM), limiting voltage to safe levels. |
| Bias Network Stabilization | Temperature-Stable Oscillator Bias |
Use Scenario: Setting fixed base-emitter voltage in amplifier bias circuits requiring low-drift DC operating points. IC Role / Device Role / Timing Role: Precision DC voltage source compensating for transistor VBE variation. Use Value: Maintains 7.5 V reference with ±2 mV/°C tempco, reducing thermal drift in analog signal chains. | Use Scenario: Providing stable bias current to crystal oscillator sustaining amplifiers in timing modules. IC Role / Device Role / Timing Role: Regulated current source via series resistor, defining oscillator loop gain. Use Value: Enables predictable startup and frequency stability by holding bias voltage constant across -65°C to +150°C. |
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 | No "e3" RoHS suffix; Sn/Pb terminations; same electrical specs and DO-41 package | Suitable for legacy Pb-containing assembly processes where RoHS exemption applies | Select when leaded solder compatibility is required and environmental compliance is not mandated |
| MMSZ4702T1G | Surface-mount SOD-123 package; 7.5 V ±5%; 500 mW rating; 30 mA IZT; 7 Ω ZZT | Used in space-constrained PCBs where axial leads are impractical | Choose for high-density layouts needing smaller footprint, accepting reduced power and higher impedance |
Compared with 1N4737APE3/TR8, the 1N4737A-T offers identical regulation performance with leaded terminations for legacy processes, while MMSZ4702T1G trades 1.0 W power and 4.0 Ω impedance for SMT compatibility-critical when board area or automated placement drive package choice.
Availability
1N4737APE3/TR8 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and bias network stabilization requiring stable component supply across industrial, automotive, and embedded design cycles.
Supply support for 1N4737APE3/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 where long-term stability, thermal resilience, and JEDEC-standard interchangeability are essential.
FAQ
What is the Zener voltage tolerance for 1N4737APE3/TR8?
The 1N4737APE3/TR8 has a nominal Zener voltage of 7.5 V with a tolerance of ±5%, as indicated by the "A" suffix in the part number per JEDEC registration. This tolerance is guaranteed at 34 mA test current and 25°C lead temperature, and remains valid across the full -65°C to +150°C operating range per Microsemi's characterization data.
Does 1N4737APE3/TR8 require dry packing before PCB assembly?
No, the 1N4737APE3/TR8 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 surface mount or through-hole assembly. Its void-free epoxy body and Level 1 classification eliminate moisture-related popcorning risks during reflow.
What is the maximum surge current rating for 1N4737APE3/TR8?
The 1N4737APE3/TR8 has a maximum non-repetitive 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 enables reliable transient suppression in power rails and interface lines without degradation when used within specified thermal limits.
Can 1N4737APE3/TR8 be used in place of older 1N4737A parts?
Yes, the 1N4737APE3/TR8 is a direct functional replacement for legacy 1N4737A parts, retaining identical electrical specifications, DO-41 package dimensions, and Zener characteristics. The "P" denotes plastic construction (lower thermal resistance vs. glass), "e3" confirms RoHS compliance, and "TR8" specifies EIA-296 tape-and-reel packaging-no circuit or layout changes are needed.
What is the thermal resistance from junction to ambient for 1N4737APE3/TR8 on a standard PCB?
When mounted on a FR4 printed circuit board with 1 oz copper, 4 mm² copper pads, and 1 mm track width (25 mm length), the 1N4737APE3/TR8 exhibits a junction-to-ambient thermal resistance of 105°C/W. This value guides derating calculations for continuous operation above 45°C ambient, as shown in Figure 1 of the Microsemi datasheet.
1N4737APE3/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:
- ±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/TR8 FAQ
1.How can I place an order for 1N4737APE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4737APE3/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 1N4737APE3/TR8 reliable?
The price and inventory of 1N4737APE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4737APE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4737APE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4737APE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4737APE3/TR8?
1N4737APE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4737APE3/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 1N4737APE3/TR8?
For technical support, including 1N4737APE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4737APE3/TR8 requirements.
6.How does Aetrix verify that 1N4737APE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4737APE3/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 1N4737APE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4737APE3/TR8?
All 1N4737APE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4737APE3/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 1N4737APE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4737APE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4737APE3/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
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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