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Microchip Technology 1N4740P/TR8
- Part No.:
- 1N4740P/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4740P/TR8.pdf
- Description:
- DIODE ZENER 10V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,111
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Product details
Overview
1N4740P/TR8 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 feedback loops, reference circuits, and overvoltage protection.
For engineers reviewing the 1N4740P/TR8 datasheet, 1N4740P/TR8 pinout, 1N4740P/TR8 application, or 1N4740P/TR8 equivalent, key selection factors include its DO-41 package thermal resistance (45 °C/W junction-to-lead), 105 °C/W junction-to-ambient rating on FR4, -65 °C to +150 °C operating range, and RoHS-compliant "e3" variant availability.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable 10 V regulation across 1 mA to 91 mA DC current range, with sharp knee characteristics verified by dual-point Zener impedance measurement per MicroNote 202. Its plastic DO-41 construction delivers lower thermal resistance than glass-body variants and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack.
The device features cathode band polarity marking, tin-lead or matte-tin plating per MIL-STD-750 Method 2026, and is rated for 260 °C soldering (10 s max). It exhibits 0.25 A maximum surge current under 1/120 s half-sine pulse and 1.2 V forward voltage at 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10 V ±5% at 25 °C, TL = 25 °C ±8/-2 °C, measured 90 s after DC current application |
| Power Dissipation | 1.0 W at TL < 105 °C (3/8″ lead length) or TA < 45 °C on FR4 board with 4 mm² copper pads |
| Test Current (IZT) | 25 mA - defines nominal VZ and ZZT; used for production screening and datasheet compliance |
| Dynamic Impedance (ZZT) | 7 Ω at IZT = 25 mA - indicates regulation stability under small-signal AC ripple superimposed on DC bias |
| Max Reverse Current (IR) | 10 μA at VR = 7.6 V - ensures low leakage in standby or high-impedance reference nodes |
| Thermal Resistance | 45 °C/W junction-to-lead (3/8″ lead length); 105 °C/W junction-to-ambient on FR4 - critical for thermal design margining |
| Operating Temperature | -65 °C to +150 °C - supports industrial, automotive under-hood, and military-grade applications |
Pinout & Package
Package: DO-41 (JEDEC DO-204AL), axial-leaded, void-free thermosetting epoxy case meeting UL94V-0; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Banded end | Connected to regulated output or higher potential node; must be positive relative to anode for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| Plastic encapsulation (P suffix) | 45 °C/W junction-to-lead thermal resistance - 30% lower than glass-body equivalents, improving power handling in compact layouts |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - reduces manufacturing prep time and cost for SMT reflow compatibility |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in assembly and field service |
| Tape-and-reel packaging | TR8 suffix denotes EIA-296 standard tape/reel - enables automated pick-and-place for high-volume PCB assembly |
| RoHS compliance option | "e3" suffix indicates annealed matte-tin plating - satisfies EU RoHS Directive 2011/65/EU without performance trade-offs |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates error amplifier input in isolated flyback or forward converter feedback networks. IC Role / Device Role / Timing Role: Provides stable 10 V reference for optocoupler-driven secondary-side regulation. Use Value: Enables ±5% output voltage accuracy over line/load/temperature with minimal component count and no active IC. | Use Scenario: Supplies excitation voltage to bridge-based pressure or temperature transducers in PLC analog input modules. IC Role / Device Role / Timing Role: Acts as low-drift, low-noise shunt reference replacing more expensive bandgap ICs in 4–20 mA loop-powered sensors. Use Value: Delivers 10 V ±5% at 1 mA–20 mA load range with <7 Ω dynamic impedance, reducing gain error in ratiometric ADC measurements. |
| Overvoltage Clamp Protection | Microcontroller I/O Protection |
Use Scenario: Clamps transient surges on 12 V rail in automotive body control modules exposed to load dump. IC Role / Device Role / Timing Role: Shunts excess energy above 10.5 V to ground before downstream LDOs or microcontrollers are damaged. Use Value: Withstands 0.25 A surge current (1/120 s half-sine) and maintains regulation down to 1 mA, enabling robust Class III ISO 7637-2 compliance. | Use Scenario: Protects 3.3 V or 5 V GPIO pins from ESD and accidental 12 V miswiring in industrial HMI panels. IC Role / Device Role / Timing Role: Functions as bidirectional clamp when paired with series resistor, limiting pin voltage to 10 V + VF during overvoltage events. Use Value: Leverages 1.2 V forward voltage at 200 mA and 10 μA leakage at 7.6 V to minimize standby current while ensuring fast clamping response. |
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; 60 °C/W junction-to-lead vs. 45 °C/W for 1N4740P/TR8 | Higher thermal resistance limits power derating in confined spaces; not qualified for moisture-sensitive assembly | Select only if legacy glass-body form factor or MIL-PRF-19500 screening (e.g., JANTXV-1N4740A) is required |
| MMSZ4700T1G | Surface-mount SOD-123 package; 10 V ±5%, 10 mA IZT, 20 Ω ZZT; rated 500 mW, not 1 W | Lower power rating and higher impedance limit use to low-current references (<5 mA); unsuitable for clamping or high-current regulation | Choose for space-constrained PCBs where 1 W dissipation is unnecessary and reflow compatibility is prioritized over thermal performance |
Compared with 1N4740A and MMSZ4700T1G, the 1N4740P/TR8 offers superior thermal management in axial-lead designs and higher surge capability, making it preferred for industrial power rails and ruggedized analog references where reliability under thermal stress is critical.
Availability
1N4740P/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor references, overvoltage clamp protection, and microcontroller I/O protection requiring stable component supply and long-term obsolescence management.
Supply support for 1N4740P/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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was developed to deliver JEDEC-standardized, high-stability Zener regulation in plastic packages optimized for thermal performance and manufacturability in high-volume industrial electronics.
FAQ
What is the Zener voltage tolerance for 1N4740P/TR8?
The 1N4740P/TR8 has a nominal Zener voltage of 10 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This tolerance is specified at 25 °C lead temperature and verified under standardized test conditions per Microsemi's REV C datasheet. The 1N4740P/TR8 does not support tighter tolerances (e.g., ±1% or ±2%) - those require suffixes "D" or "C", respectively, which are not present in this part number.
Can 1N4740P/TR8 be used in surface-mount designs?
No, the 1N4740P/TR8 uses a DO-41 axial-leaded package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMAJ4740A (SMA package) and MLL4740A (SOD-123 variant), both requiring separate part numbers and layout adaptation. The "TR8" suffix on 1N4740P/TR8 refers to tape-and-reel packaging for through-hole placement, not surface-mount compatibility.
What is the maximum surge current rating for 1N4740P/TR8?
The 1N4740P/TR8 is rated for a maximum surge current (ISM) of 0.25 A, measured using a 1/120 second half-sine or equivalent pulse at 25 °C ambient. This rating applies to transient overvoltage events such as load dump or ESD-induced spikes. Exceeding this value risks irreversible junction damage, and sustained operation above 91 mA DC (IZM at TA = 50 °C) requires thermal derating per Figure 1 in the datasheet.
Does 1N4740P/TR8 meet RoHS requirements?
Yes, the 1N4740P/TR8 is available in RoHS-compliant form with the "e3" suffix (e.g., 1N4740P/TR8e3), indicating annealed matte-tin terminal plating per J-STD-609. Standard 1N4740P/TR8 units may use Sn/Pb plating unless otherwise specified; RoHS compliance must be confirmed by the full orderable part number and lot traceability documentation from Aetrix Electronics.
How does the thermal resistance of 1N4740P/TR8 compare to glass-body Zeners?
The 1N4740P/TR8 has a junction-to-lead thermal resistance of 45 °C/W at 3/8″ lead length, which is significantly lower than the ~60 °C/W typical of glass-body 1N4740A devices. This 25% improvement enables higher continuous power dissipation in thermally constrained environments and reduces junction temperature rise under identical load conditions, directly extending reliability in industrial power applications.
1N4740P/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):
- 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/TR8 FAQ
1.How can I place an order for 1N4740P/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4740P/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 1N4740P/TR8 reliable?
The price and inventory of 1N4740P/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4740P/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4740P/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4740P/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4740P/TR8?
1N4740P/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4740P/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 1N4740P/TR8?
For technical support, including 1N4740P/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4740P/TR8 requirements.
6.How does Aetrix verify that 1N4740P/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4740P/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 1N4740P/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4740P/TR8?
All 1N4740P/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4740P/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 1N4740P/TR8 part is unused and in its original packaging.
Return procedure for 1N4740P/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4740P/TR8 Tags
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