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Microchip Technology 1N4756P/TR12
- Part No.:
- 1N4756P/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4756P/TR12.pdf
- Description:
- DIODE ZENER 47V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,306
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Product details
Overview
1N4756P/TR12 from Microsemi is a 1.0 W axial-lead silicon Zener diode with nominal Zener voltage of 47 V, ±5% tolerance (A-suffix), 5.5 mA test current, 80 Ω dynamic impedance at IZT, and maximum reverse current of 5 μA at 35.8 V. It regulates voltage in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N4756P/TR12 datasheet, 1N4756P/TR12 pinout, 1N4756P/TR12 application, or 1N4756P/TR12 equivalent, key selection factors include its DO-41 package, 45 °C/W junction-to-lead thermal resistance, 1500 mA maximum regulator current at TA = 50 °C, RoHS-compliant "e3" plating option, and tape-and-reel packaging (TR12).
Technical Context
This Zener operates in reverse breakdown to maintain stable voltage under varying load and line conditions. Its 47 V regulation point targets mid-range DC rail stabilization, with sharp knee characteristics verified by dual-point Zener impedance measurement per MicroNote 202.
Designed for through-hole mounting on FR4 PCBs with 1 oz copper, it delivers 1.0 W steady-state dissipation at TL < 105 °C (3/8″ lead length) or TA < 45 °C, with thermal resistance of 105 °C/W junction-to-ambient under defined layout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V ±5% at 5.5 mA - defines precise regulation threshold for 48 V system references |
| Power Dissipation | 1.0 W at 25 °C - sets maximum continuous thermal load without derating |
| Dynamic Impedance (ZZT) | 80 Ω at 5.5 mA - determines output voltage variation under 10% AC ripple superimposed on DC bias |
| Reverse Current (IR) | 5 μA max at 35.8 V - ensures low leakage below regulation knee, critical for standby power integrity |
| Max Regulator Current (IZM) | 1500 mA at TA = 50 °C - establishes peak safe operating current before thermal runaway |
| Thermal Resistance (RθJL) | 45 °C/W junction-to-lead - enables accurate junction temperature estimation using lead temperature measurement |
| Operating Temperature | –65 °C to +150 °C - supports deployment in automotive engine compartments and industrial control enclosures |
Pinout & Package
DO-41 (DO-204AL) plastic molded package with axial leads; cathode indicated by band; polarity must be observed-banded end connected to higher potential during regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in Zener shunt configuration | Connected to ground or lower-potential node; carries full regulator current when active |
| Cathode | High-side connection; voltage reference node | Banded end; held at regulated 47 V above anode; requires current-limiting resistor upstream |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxA series | Industry-standard footprint and electrical behavior enabling direct design reuse and procurement continuity |
| Moisture Sensitivity Level 1 | No dry pack required prior to soldering-reduces handling cost and avoids moisture-related popcorning |
| RoHS-compliant "e3" plating option | Matte-tin termination compatible with Pb-free reflow and legacy SnPb processes without contamination risk |
| Tape-and-reel packaging (TR suffix) | Enables automated pick-and-place assembly; TR12 denotes 12 mm tape width per EIA-296 standard |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special ESD handling during board assembly and testing |
Applications
| Power Supply Voltage Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback node in linear regulator or switching converter error amplifier circuit. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 47 V setpoint for error comparison. Use Value: Maintains ±5% output regulation despite input ripple and load transients due to low ZZT and sharp knee. | Use Scenario: Clamping transient surges on 48 V telecom or industrial bus lines. IC Role / Device Role / Timing Role: Crowbar element diverting excess energy to ground when bus exceeds 47 V. Use Value: Limits peak voltage to 47 V + ISM × ZZT, protecting downstream MOSFETs and controllers rated for ≤50 V. |
| DC-DC Converter Feedback Divider | Industrial Sensor Excitation Reference |
Use Scenario: Setting output voltage in isolated flyback or forward converter via optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Precision Zener establishing upper divider node for secondary-side voltage sensing. Use Value: Enables accurate 48 V output regulation with minimal temperature drift (TC specified in Figure 3). | Use Scenario: Providing stable excitation voltage for 4–20 mA current-loop pressure or temperature transmitters. IC Role / Device Role / Timing Role: Low-drift voltage source powering sensor bridge or IC amplifier stage. Use Value: Ensures transmitter output accuracy remains within 0.1% FS over –40 °C to +85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4756A | No TR suffix; bulk packaging only; identical electrical specs and DO-41 package | Not suitable for automated SMT assembly; requires manual or vibration-feed placement | Select 1N4756A for prototyping or low-volume hand-soldered builds where reel packaging is unnecessary |
| MMBZ5270BS-7-F | Surface-mount SOT-23 package; 47 V, ±5%, 200 mW rating; 10x smaller footprint | Cannot handle 1500 mA IZM; limited to ≤100 mA continuous use; unsuitable for high-power clamping | Select MMBZ5270BS-7-F only for space-constrained low-current bias/reference roles-not as drop-in replacement |
Compared with 1N4756A (bulk) and MMBZ5270BS-7-F (SMT), the 1N4756P/TR12 uniquely combines 1 W power handling, DO-41 mechanical robustness, tape-and-reel automation readiness, and industry-standard JEDEC registration-making it optimal for high-reliability through-hole production of 48 V power systems.
Availability
1N4756P/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifier modules, and automotive body control units requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4756P/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N47xxAP series was developed to deliver JEDEC-standard Zener performance with enhanced thermal reliability and RoHS compliance-targeting mission-critical voltage reference and protection functions in harsh environments.
FAQ
What is the Zener voltage tolerance of the 1N4756P/TR12?
The 1N4756P/TR12 has a nominal Zener voltage of 47 V with ±5% tolerance, indicated by the "A" suffix in the part number per JEDEC standard. This means the actual measured VZ at 5.5 mA test current falls between 44.65 V and 49.35 V at TL = 25 °C. The tolerance is guaranteed across the full operating temperature range of –65 °C to +150 °C.
Does the 1N4756P/TR12 require dry packing before reflow soldering?
No, the 1N4756P/TR12 is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ambient conditions without baking or dry pack. Its void-free epoxy body and annealed tin plating eliminate popcorning risk-even at peak reflow temperatures up to 260 °C for 10 seconds.
What is the maximum surge current rating for the 1N4756P/TR12?
The 1N4756P/TR12 has a maximum non-repetitive reverse surge current (ISM) of 1500 mA, measured using a ½ sine wave pulse of 1/120 second duration at 25 °C ambient. This rating applies only to short-duration transients; sustained operation above 1500 mA risks thermal failure unless heatsinking and duty cycle are strictly controlled.
Can the 1N4756P/TR12 be used as a direct replacement for the glass-body 1N4756G?
No-the 1N4756P/TR12 uses a plastic DO-41 package with lower thermal resistance (45 °C/W vs. ~60 °C/W for glass), different marking, and distinct moisture handling requirements. While both regulate at 47 V, the P-suffix device offers improved thermal performance and RoHS compliance but is not mechanically or thermally interchangeable without layout review.
What does the "TR12" suffix indicate in 1N4756P/TR12?
The "TR12" suffix indicates tape-and-reel packaging per EIA-296 standard, with 12 mm carrier tape width. Each reel contains 1000 units, optimized for automated pick-and-place equipment. The "P" denotes plastic encapsulation, distinguishing it from glass-body variants, while "TR" confirms factory-loaded, static-dissipative packaging with leader/tail sections and orientation indexing.
1N4756P/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):
- 47 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 35.8 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)
1N4756P/TR12 FAQ
1.How can I place an order for 1N4756P/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4756P/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 1N4756P/TR12 reliable?
The price and inventory of 1N4756P/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4756P/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4756P/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4756P/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4756P/TR12?
1N4756P/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4756P/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 1N4756P/TR12?
For technical support, including 1N4756P/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4756P/TR12 requirements.
6.How does Aetrix verify that 1N4756P/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4756P/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 1N4756P/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4756P/TR12?
All 1N4756P/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4756P/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 1N4756P/TR12 part is unused and in its original packaging.
Return procedure for 1N4756P/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4756P/TR12 Tags
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