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Microchip Technology 1N4740P/TR12
- Part No.:
- 1N4740P/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4740P/TR12.pdf
- Description:
- DIODE ZENER 10V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,760
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Product details
Overview
1N4740P/TR12 from Microsemi is a 10 V, 1 W plastic-encapsulated Zener diode with ±5% voltage tolerance, 25 mA test current, and 7 Ω dynamic impedance at IZT, designed for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4740P/TR12 datasheet, 1N4740P/TR12 pinout, 1N4740P/TR12 application, or 1N4740P/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45 °C/W junction-to-lead), surge current rating (454 mA), RoHS-compliant "e3" plating option, and DO-41 axial-leaded package compatibility with manual and wave-solder processes.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable 10 V regulation across 10 mA to 454 mA DC current range, with low knee impedance (0.25 Ω at 0.25 mA) ensuring sharp turn-on behavior. Its moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1, eliminating dry-pack requirements.
The device features tin-lead or matte-tin plating per MIL-STD-750 Method 2026, cathode band polarity marking, and UL94V-0 void-free epoxy case. 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) | 10 V ±5% at 25 °C, measured 90 s after DC current application - defines nominal regulation point under stable thermal conditions |
| Power Dissipation | 1.0 W at 25 °C, derated linearly above 105 °C lead temp or 45 °C ambient - sets maximum continuous DC power handling on PCB |
| Dynamic Impedance (ZZT) | 7 Ω at 25 mA test current - determines output voltage variation under load current changes |
| Reverse Surge Current (ISM) | 454 mA peak, ½-sine pulse, 1/120 s duration - specifies transient overvoltage clamping capability |
| Thermal Resistance | 45 °C/W junction-to-lead (3/8″ lead length) - enables thermal design of heatsinking and board layout |
| Forward Voltage | ≤1.2 V at 200 mA - ensures predictable forward conduction if used in bidirectional protection schemes |
| Operating Temperature | –65 °C to +150 °C - supports industrial and automotive under-hood environments |
Pinout & Package
Package: DO-41 (DO-204AL) axial-leaded plastic case, 0.7 g weight, UL94V-0 epoxy body, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node during Zener operation; forward conduction path when cathode is negative |
| Cathode | Banded end | Connected to higher-potential node during regulation; defines Zener breakdown polarity and voltage reference polarity |
Key Features
| Feature | Design Value |
|---|---|
| Plastic encapsulation (P suffix) | Lower thermal resistance vs. glass-body variants - improves power handling reliability in compact layouts |
| JEDEC 1N47xxA registration | Industry-standard footprint and electrical behavior - ensures interoperability and design reuse across suppliers |
| RoHS-compliant "e3" option | Matte-tin plating compliant with EU Directive 2011/65/EU - meets environmental compliance without solderability trade-offs |
| MIL-STD-750 ESD immunity | Nonsensitive per Method 1020 - eliminates need for ESD handling controls in assembly |
| Moisture Sensitivity Level 1 | No dry pack required per J-STD-020B - reduces manufacturing prep time and cost |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stable 10 V reference in linear regulator feedback networks or ADC reference dividers. IC Role / Device Role / Timing Role: Voltage reference element providing precise, temperature-stable bias point. Use Value: ±5% initial tolerance and low 7 Ω dynamic impedance minimize output drift under varying load currents. | Use Scenario: Protection circuit limiting input voltage to 10 V against transients in 12 V rail systems. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess current when voltage exceeds 10 V. Use Value: 454 mA surge rating and fast knee impedance (0.25 Ω at 0.25 mA) enable reliable transient suppression without crowbar action. |
| Signal Level Translation | Current Source Bias |
Use Scenario: Clamping logic signal swing to 10 V in mixed-voltage interface between 3.3 V MCU and 10 V sensor. IC Role / Device Role / Timing Role: Bidirectional voltage limiter defining upper signal rail. Use Value: Low forward voltage (≤1.2 V) and symmetric Zener knee allow clean clipping in both directions with minimal distortion. | Use Scenario: Constant-current source for LED bias or op-amp input stage using series resistor + 1N4740P/TR12. IC Role / Device Role / Timing Role: Voltage-regulating element establishing fixed drop across current-setting resistor. Use Value: Stable 10 V regulation over –65 °C to +150 °C enables predictable current setting across wide environmental ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A | No "P" suffix - glass-body DO-35 package; higher thermal resistance (65 °C/W junction-to-lead) | Limited power handling in high-density layouts; not recommended for >0.5 W sustained dissipation | Select only if legacy glass-body form factor required or thermal derating margin is sufficient |
| MMBZ5240B | SOT-23 surface-mount; 10 V ±5%, 0.2 W rating; 20 Ω ZZT at 20 mA | Not suitable for 1 W power applications; intended for low-current biasing, not shunt regulation | Choose for space-constrained PCBs where <100 mA regulation current suffices and reflow compatibility is needed |
Compared with 1N4740A and MMBZ5240B, the 1N4740P/TR12 delivers superior thermal performance in axial-leaded form, enabling full 1 W operation with standard lead-forming and wave-solder processes - critical for industrial power supplies requiring long-term reliability at elevated ambient temperatures.
Availability
1N4740P/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, analog sensor interfaces, and overvoltage protection circuits requiring stable component supply and JEDEC-standard Zener behavior.
Supply support for 1N4740P/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 1N47xxAP series was developed to deliver JEDEC-standard 1 W Zener regulation with enhanced thermal performance in plastic packaging - targeting cost-sensitive yet thermally demanding applications in power conversion and ruggedized electronics.
FAQ
What is the Zener voltage tolerance of the 1N4740P/TR12?
The 1N4740P/TR12 has a nominal Zener voltage of 10 V with a ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This tolerance is specified at 25 °C lead temperature and verified 90 seconds after DC current application, ensuring consistent regulation across production lots and operating conditions.
Does the 1N4740P/TR12 require dry packing before PCB assembly?
No, the 1N4740P/TR12 is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it does not absorb significant moisture during normal factory handling and requires no dry pack or baking prior to assembly - simplifying SMT and through-hole manufacturing workflows.
What is the maximum surge current rating for the 1N4740P/TR12?
The 1N4740P/TR12 supports a maximum reverse surge current (ISM) of 454 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating enables robust transient voltage suppression in 12 V automotive and industrial power rails without device failure.
Is the 1N4740P/TR12 RoHS compliant?
Yes, the 1N4740P/TR12 is available in RoHS-compliant configuration with "e3" suffix indicating annealed matte-tin plating per JEDEC standards. The base part number implies standard Sn/Pb plating, but Aetrix Electronics supplies only RoHS-compliant units unless otherwise specified.
How does the thermal resistance of the 1N4740P/TR12 compare to glass-body variants?
The 1N4740P/TR12 has a junction-to-lead thermal resistance of 45 °C/W at 3/8″ lead length, significantly lower than the 65 °C/W of the glass-body 1N4740A. This 31% improvement allows higher continuous power dissipation in the same mechanical layout, reducing risk of thermal runaway in enclosed enclosures.
1N4740P/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):
- 10 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 7.6 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)
1N4740P/TR12 FAQ
1.How can I place an order for 1N4740P/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4740P/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 1N4740P/TR12 reliable?
The price and inventory of 1N4740P/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4740P/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4740P/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4740P/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4740P/TR12?
1N4740P/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4740P/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 1N4740P/TR12?
For technical support, including 1N4740P/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4740P/TR12 requirements.
6.How does Aetrix verify that 1N4740P/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4740P/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 1N4740P/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4740P/TR12?
All 1N4740P/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4740P/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 1N4740P/TR12 part is unused and in its original packaging.
Return procedure for 1N4740P/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4740P/TR12 Tags
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