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Microchip Technology 1N4737AP/TR12
- Part No.:
- 1N4737AP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4737AP/TR12.pdf
- Description:
- DIODE ZENER 7.5V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,497
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Product details
Overview
1N4737AP/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 regulator current 605 mA at TA = 50°C. It operates from –65°C to +150°C and is used for precision voltage regulation in power supply reference circuits, overvoltage protection clamps, and analog signal conditioning stages.
For engineers reviewing the 1N4737AP/TR12 datasheet, 1N4737AP/TR12 pinout, 1N4737AP/TR12 application, or 1N4737AP/TR12 equivalent, key selection criteria include its DO-41 axial-lead package, 7.5 V regulation tolerance, thermal resistance of 45°C/W (junction-to-lead), RoHS-compliant "e3" plating option, and compatibility with tape-and-reel automated assembly (TR12 suffix).
Technical Context
This device functions as a reverse-biased voltage reference diode, maintaining stable output voltage across wide operating current (1–605 mA) and temperature (–65°C to +150°C) ranges. Its sharp breakdown knee (verified by ZZK = 0.5 Ω @ IZK = 5 mA) ensures reliable regulation under transient load conditions.
The DO-41 package provides flexible through-hole mounting with cathode band polarity marking, tin-lead or matte-tin plating per MIL-STD-750 Method 2026, and UL94V-0 epoxy body. Thermal performance is specified at 3/8″ lead length (45°C/W junction-to-lead) and on FR4 board (105°C/W junction-to-ambient).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 7.5 V ±5% at IZT = 34 mA - defines stable regulation point for reference and clamp designs |
| Power Dissipation | 1.0 W at TL < 105°C - limits continuous DC power handling without derating |
| Dynamic Impedance (ZZT) | 4.0 Ω @ IZT - low AC impedance ensures minimal output voltage variation under load transients |
| Max Regulator Current (IZM) | 605 mA at TA = 50°C - sets upper bound for safe steady-state reverse conduction |
| Thermal Resistance | 45°C/W junction-to-lead - enables thermal design with discrete lead heatsinking |
| Reverse Leakage (IR) | 5 µA @ VR = 6 V - confirms low off-state current for high-impedance bias networks |
| Forward Voltage | 1.2 V max @ 200 mA - supports use as forward-conducting protection diode if needed |
Pinout & Package
Package: DO-41 (DO-204AL), axial-lead plastic encapsulated case with cathode indicated by colored band. Body dimensions conform to JEDEC standard; weight 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode | Zener regulation terminal / reverse-bias input | Banded end; connected to unregulated input or voltage rail requiring stabilization |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Industry-standard footprint and electrical behavior for drop-in replacement across legacy designs |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies SMT line handling and eliminates bake-out steps pre-assembly |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - suitable for manual handling and low-ESD-control environments |
| RoHS-compliant "e3" option | Matte-tin plating meets EU RoHS Directive 2011/65/EU and China RoHS II requirements |
| Tape-and-reel packaging (TR12) | EIA-296 compliant - enables high-speed pick-and-place placement in automated PCB assembly |
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 providing precise 7.5 V reference to error amplifier input. Use Value: Maintains ±5% output accuracy despite input ripple and load variation due to low ZZT and sharp knee. |
Use Scenario: Protecting microcontroller I/O pins from transient voltage spikes exceeding 7.5 V. IC Role / Device Role / Timing Role: Shunt clamping element diverting surge current away from sensitive inputs. Use Value: Limits peak voltage to ≤7.5 V + IR × Rseries while surviving 605 mA surges per JEDEC spec. |
| Analog Signal Conditioning | Threshold Detection |
Use Scenario: Biasing op-amp comparators or setting mid-rail references in single-supply sensor interfaces. IC Role / Device Role / Timing Role: Stable DC voltage source for precision offset or gain-setting networks. Use Value: Delivers <1.5 mV/°C tempco and <0.5 Ω knee impedance for sub-mV stability over industrial temperature range. |
Use Scenario: Triggering reset logic when supply voltage drops below 7.5 V during brownout events. IC Role / Device Role / Timing Role: Reverse-biased threshold detector enabling system-level power monitoring. Use Value: Provides deterministic turn-on at 7.5 V ±5% with fast response (<100 ns) due to low capacitance and sharp breakdown. |
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 TR12 tape-and-reel; bulk or ammo-pack only; same electrical specs and DO-41 package | Not suitable for automated SMT lines requiring reel-fed feeders | Select 1N4737AP/TR12 when production volume demands EIA-296 tape-and-reel delivery |
| BZX55C7V5 | Same 7.5 V ±5%, but 500 mW rating, higher ZZT (10 Ω), and DO-35 glass package | Limited to lower-power clamping; less robust thermal performance and no TR option | Choose BZX55C7V5 only for cost-sensitive, low-current, non-automated applications where 1W rating is unnecessary |
Compared with 1N4737A and BZX55C7V5, the 1N4737AP/TR12 offers full 1W power handling, lowest dynamic impedance in its class, and factory-qualified tape-and-reel support-making it optimal for industrial power supplies and automated manufacturing where reliability and process compatibility are critical.
Availability
1N4737AP/TR12 is available at Aetrix Electronics and suitable for power supply reference circuits, overvoltage protection systems, and analog signal conditioning applications requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant sourcing.
Supply support for 1N4737AP/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, RF, and timing components for aerospace, defense, and industrial markets.
The 1N4737AP/TR12 belongs to Microsemi's legacy 1N47xxAP Zener diode family, engineered for stable voltage regulation in harsh-environment power systems where precision, thermal resilience, and JEDEC-standard compatibility are essential.
FAQ
What is the zener voltage tolerance of the 1N4737AP/TR12?
The 1N4737AP/TR12 has a nominal zener voltage of 7.5 V with a ±5% tolerance, as confirmed by the "A" suffix in its part number per Microsemi's datasheet revision C. This tolerance applies at 34 mA test current and 25°C lead temperature. The 1N4737AP/TR12 maintains this specification across its full operating temperature range of –65°C to +150°C, supporting consistent performance in industrial-grade power designs.
Does the 1N4737AP/TR12 support automated assembly?
Yes-the "TR12" suffix indicates EIA-296 compliant tape-and-reel packaging, enabling direct integration into high-speed pick-and-place equipment. The 1N4737AP/TR12 is supplied in 12 mm tape width with 10,000 units per reel, verified for compatibility with standard feeder systems. Its DO-41 axial-lead form factor remains compatible with both through-hole and selective soldering processes.
What is the maximum steady-state current the 1N4737AP/TR12 can regulate?
The 1N4737AP/TR12 supports a maximum regulator current (IZM) of 605 mA at ambient temperature of 50°C, as specified in Microsemi's electrical characteristics table. At higher temperatures, derating applies per Figure 1: power dissipation reduces linearly above 50°C ambient, limiting usable current to maintain 1.0 W total dissipation. The 1N4737AP/TR12 must be mounted with ≥3/8″ lead length to achieve its rated 45°C/W thermal resistance.
Is the 1N4737AP/TR12 RoHS compliant?
Yes-the "e3" designation in the full Microsemi part number (1N4737AP,e3/TR12) confirms RoHS compliance via annealed matte-tin plating per JEDEC J-STD-609. The 1N4737AP/TR12 meets EU Directive 2011/65/EU and China RoHS II requirements, with lead content below 1000 ppm. No exemptions apply; full material declarations are available upon request from Aetrix Electronics.
How does the 1N4737AP/TR12 differ from the glass-body 1N4737G variant?
The 1N4737AP/TR12 uses a void-free thermosetting epoxy DO-41 package, delivering 45°C/W junction-to-lead thermal resistance-significantly lower than the ~60°C/W typical of glass-bodied 1N4737G variants. Its plastic construction also achieves IPC/JEDEC J-STD-020B Moisture Sensitivity Level 1, eliminating dry-pack requirements. The 1N4737AP/TR12 shares identical electrical specs but offers superior manufacturability and thermal performance in high-reliability applications.
1N4737AP/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:
- ±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)
1N4737AP/TR12 FAQ
1.How can I place an order for 1N4737AP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4737AP/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 1N4737AP/TR12 reliable?
The price and inventory of 1N4737AP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4737AP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4737AP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4737AP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4737AP/TR12?
1N4737AP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4737AP/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 1N4737AP/TR12?
For technical support, including 1N4737AP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4737AP/TR12 requirements.
6.How does Aetrix verify that 1N4737AP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4737AP/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 1N4737AP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4737AP/TR12?
All 1N4737AP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4737AP/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 1N4737AP/TR12 part is unused and in its original packaging.
Return procedure for 1N4737AP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4737AP/TR12 Tags
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Diodes Incorporated
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