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Microchip Technology 1N4740AP/TR12
- Part No.:
- 1N4740AP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4740AP/TR12.pdf
- Description:
- DIODE ZENER 10V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,240
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Product details
Overview
1N4740AP/TR12 from Microsemi is a 10 V, ±5% tolerance, 1 W silicon Zener diode in DO-41 plastic package, rated for 25 mA test current (IZT), 7 Ω dynamic impedance (ZZT), and 91 mA maximum regulator current (IZM) at 50°C. It provides stable voltage regulation in power supply reference, overvoltage protection, and biasing circuits across industrial temperature range.
For engineers reviewing the 1N4740AP/TR12 datasheet, 1N4740AP/TR12 pinout, 1N4740AP/TR12 application, or 1N4740AP/TR12 equivalent, key selection criteria include its 10 V nominal Zener voltage, 1 W power rating at TL < 105°C, DO-41 axial-leaded package with cathode band polarity, and RoHS-compliant "e3" variant availability.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable 10 V reference across a wide operating current range (0.25 mA to 91 mA) and temperature range (–65°C to +150°C). Its 7 Ω dynamic impedance at 25 mA ensures low output voltage variation under load transients.
The device features a thermal resistance of 45°C/W junction-to-lead (3/8" lead length) and 105°C/W junction-to-ambient on FR4 PCB, enabling reliable power dissipation without forced cooling. Polarity is marked by a cathode band; regulation requires the banded end to be positive relative to the anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10 V ±5% at IZT = 25 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 thermal load without derating |
| Dynamic Impedance (ZZT) | 7 Ω at IZT = 25 mA - determines output voltage stability under varying load current |
| Max Regulator Current (IZM) | 91 mA at TA = 50°C - limits safe DC current for sustained regulation without thermal runaway |
| Reverse Leakage (IR) | 10 μA max at VR = 7.6 V - ensures minimal quiescent current in standby/clamp modes |
| Forward Voltage (VF) | 1.2 V max at IF = 200 mA - defines conduction loss when used in forward-biased protection paths |
| Operating Temperature | –65°C to +150°C - supports deployment in automotive under-hood, industrial control, and aerospace environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package: cylindrical epoxy body, 2.2 mm diameter × 5.2 mm length, cathode indicated by single black band. Leads are tin-lead or RoHS-compliant matte tin, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in Zener configuration | Connected to system ground or lower-potential rail; reverse-biased operation requires cathode at higher potential |
| Cathode | Regulated output node in Zener configuration | Banded end; connected to input rail or voltage source; maintains ~10 V above anode during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxA series | Industry-standard footprint and electrical behavior - enables drop-in replacement across legacy designs |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body (G-suffix) variants - improves power handling in compact layouts |
| Moisture Sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies SMT assembly and reduces handling cost |
| ESD robustness | Nonsensitive per MIL-STD-750 Method 1020 - withstands handling without special ESD controls |
| RoHS-compliant option | "e3" suffix denotes annealed matte-tin plating - meets environmental compliance without performance trade-off |
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 reference element providing fixed 10 V基准 for error amplifier comparison. Use Value: Enables ±5% output voltage accuracy across line/load/temperature variations using minimal external components. |
Use Scenario: Protecting microcontroller I/O pins or analog sensor inputs from transient voltage spikes. IC Role / Device Role / Timing Role: Shunt clamping device that conducts above 10 V to divert surge energy to ground. Use Value: Limits peak voltage to ≤10.5 V (including tolerance and dynamic rise), preventing latch-up or oxide damage. |
| Bias Voltage Generator | Threshold Detector |
Use Scenario: Establishing stable gate bias for MOSFET drivers or op-amp input offset compensation. IC Role / Device Role / Timing Role: Precision DC voltage source delivering consistent 10 V to high-impedance nodes. Use Value: Reduces drift-induced gain error in amplifiers and timing inaccuracies in comparator hysteresis networks. |
Use Scenario: Triggering protection logic when battery or bus voltage exceeds safe operating limit. IC Role / Device Role / Timing Role: Analog threshold element feeding comparator input to initiate shutdown or alert. Use Value: Provides deterministic 10 V trip point with 7 Ω impedance ensuring fast response to rising voltage edges. |
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 TR12 tape-and-reel packaging; bulk or ammo-pack only | Lacks standardized reel format for automated SMT placement | Select 1N4740AP/TR12 when requiring EIA-296 compliant tape-and-reel for pick-and-place manufacturing |
| MMBZ5240BS-7-F | SOT-23 surface-mount package; 10 V ±5%, 225 mW rating | Lower power handling and different thermal profile; unsuitable for 1 W continuous loads | Choose MMBZ5240BS-7-F only for space-constrained PCBs where 225 mW regulation suffices |
Compared with 1N4740A and MMBZ5240BS-7-F, the 1N4740AP/TR12 uniquely combines 1 W power capability, DO-41 axial-leaded mechanical robustness, and EIA-296 tape-and-reel compatibility-making it optimal for through-hole power reference and industrial clamp designs requiring volume manufacturability.
Availability
1N4740AP/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and bias voltage generation requiring stable component supply across extended production lifecycles.
Supply support for 1N4740AP/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed specifically for general-purpose voltage regulation in ruggedized, cost-sensitive applications where JEDEC standardization, thermal resilience, and long-term parametric stability are critical.
FAQ
What is the Zener voltage tolerance for 1N4740AP/TR12?
The 1N4740AP/TR12 has a nominal Zener voltage of 10 V with a ±5% tolerance, as indicated by the "A" suffix in the part number per JEDEC registration. This means the actual measured VZ at 25 mA test current falls between 9.5 V and 10.5 V under standard test conditions (TL = 25°C ±8°C, 90 s after current application).
Can 1N4740AP/TR12 be used in surface-mount designs?
No - the 1N4740AP/TR12 uses a DO-41 axial-leaded package intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMAJ4740A (SMA package) and MLL4740A (SOD-123), both sharing identical 10 V ±5% regulation but differing in thermal and mechanical characteristics.
What is the maximum continuous current for 1N4740AP/TR12 at room temperature?
At ambient temperature (TA) ≤ 45°C on an FR4 PCB with specified copper pads, the 1N4740AP/TR12 supports up to 91 mA continuous regulator current (IZM) while maintaining 1 W power dissipation. Exceeding this current risks thermal runaway unless heatsinking or derating is applied per Figure 1 in the datasheet.
Does 1N4740AP/TR12 require dry packing before reflow?
No - the 1N4740AP/TR12 is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ≤30°C/60% RH without dry pack or baking. This eliminates pre-reflow moisture mitigation steps for board assembly.
How does the "TR12" suffix affect the 1N4740AP/TR12 specification?
The "TR12" suffix indicates EIA-296 standard tape-and-reel packaging with 12 mm tape width and 1000 units per reel. It does not alter electrical or thermal specifications - all parameters remain identical to the base 1N4740AP part, including 10 V Zener voltage, 1 W rating, and DO-41 package dimensions.
1N4740AP/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:
- ±5%
- 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)
1N4740AP/TR12 FAQ
1.How can I place an order for 1N4740AP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4740AP/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 1N4740AP/TR12 reliable?
The price and inventory of 1N4740AP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4740AP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4740AP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4740AP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4740AP/TR12?
1N4740AP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4740AP/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 1N4740AP/TR12?
For technical support, including 1N4740AP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4740AP/TR12 requirements.
6.How does Aetrix verify that 1N4740AP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4740AP/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 1N4740AP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4740AP/TR12?
All 1N4740AP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4740AP/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 1N4740AP/TR12 part is unused and in its original packaging.
Return procedure for 1N4740AP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4740AP/TR12 Tags
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MM5Z5V1ST1G
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