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Microchip Technology 1N4756P/TR8
- Part No.:
- 1N4756P/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4756P/TR8.pdf
- Description:
- DIODE ZENER 47V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,480
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Product details
Overview
1N4756P/TR8 from Microsemi is a 1.0 W, 47 V ±5% axial-lead silicon Zener diode in DO-41 plastic package, designed for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation at up to 95 mA maximum Zener current (IZM) with 80 Ω dynamic impedance (ZZT) at 5.5 mA test current.
For engineers reviewing the 1N4756P/TR8 datasheet, 1N4756P/TR8 pinout, 1N4756P/TR8 application, or 1N4756P/TR8 equivalent, key selection criteria include its 47 V nominal Zener voltage, 5.5 mA test current, 80 Ω dynamic impedance, -65°C to +150°C operating temperature range, and RoHS-compliant "e3" variant availability.
Technical Context
This Zener operates in reverse breakdown mode with cathode band indicating polarity; regulation is stable across 1 mA to 95 mA DC current and maintains ±5% tolerance at TL = 25°C. Its thermal resistance is 45°C/W junction-to-lead (3/8" lead length) and 105°C/W junction-to-ambient on FR4 board.
The device exhibits 0.25 A surge current rating (½-sine, 1/120 s), 35.8 V minimum knee voltage (VR), and 19 Ω knee impedance (ZZK) at 0.25 mA test current - confirming sharp breakdown characteristics suitable for low-noise reference use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 47 V ±5% at 5.5 mA - defines precise regulation point for feedback or clamping |
| Power Dissipation | 1.0 W at TL < 105°C - limits continuous thermal load on PCB traces and leads |
| Dynamic Impedance (ZZT) | 80 Ω at IZT = 5.5 mA - determines output voltage stability under varying load current |
| Max Reverse Current (IR) | 5 μA at VR = 35.8 V - ensures minimal leakage before breakdown onset |
| Surge Current (ISM) | 1500 mA peak (1/120 s) - supports transient overvoltage suppression without failure |
| Operating Temp Range | -65°C to +150°C - enables use in automotive under-hood and industrial control environments |
| Forward Voltage (VF) | ≤1.2 V at 200 mA - allows safe forward-bias testing or dual-use as rectifier in low-current paths |
Pinout & Package
DO-41 (JEDEC DO-204AL) plastic axial-leaded package with cathode indicated by colored band; terminals are unmarked anode and banded cathode - no internal circuitry or multi-pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node during Zener operation; used for forward conduction test |
| Cathode | Banded end | Connected to higher-potential node during regulation; must be biased positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Moisture Sensitivity Level | Level 1 per J-STD-020B - eliminates dry-pack requirement and simplifies SMT handling |
| ESD Robustness | Nonsensitive per MIL-STD-750 Method 1020 - withstands handling without special grounding protocols |
| Thermal Resistance | 45°C/W junction-to-lead - enables reliable 1 W operation with minimal heatsinking |
| RoHS Compliance | e3 suffix option available - meets EU directive with matte-tin plating and lead-free assembly compatibility |
| Package Construction | Void-free UL94V-0 epoxy body - provides mechanical durability and flame resistance for safety-critical designs |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference Voltage |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of 24 V offline SMPS to regulate output within ±1%. IC Role / Device Role / Timing Role: Zener reference providing stable 47 V threshold to TL431 shunt regulator input. Use Value: 80 Ω ZZT ensures <10 mV output variation across 10–90% load, improving cross-regulation. | Use Scenario: Provides excitation voltage for 4–20 mA current-loop pressure transmitters in factory automation. IC Role / Device Role / Timing Role: Precision voltage clamp limiting op-amp rail swing to protect ADC input stage. Use Value: ±5% Vz tolerance and -65°C to +150°C range ensure calibration stability across ambient extremes. |
| Overvoltage Protection Clamp | Programmable Logic Controller Input Protection |
Use Scenario: Placed across 48 V DC bus to suppress lightning-induced transients in telecom power systems. IC Role / Device Role / Timing Role: Fast-acting shunt element diverting surge energy above 47 V to ground. Use Value: 1500 mA ISM rating handles 10/1000 µs surges without degradation, extending system MTBF. | Use Scenario: Protects 24 V digital input channel of PLC against accidental 120 VAC miswiring. IC Role / Device Role / Timing Role: Primary clamping device limiting input voltage to safe level before series resistor and opto-isolator. Use Value: Low 19 Ω ZZK ensures rapid turn-on at 35.8 V, preventing latch-up in upstream logic ICs. |
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 "P" suffix → glass DO-35 package; higher thermal resistance (60°C/W vs. 45°C/W) | Less suitable for high-power-density layouts due to inferior heat dissipation | Choose only if legacy glass-body design or MIL-PRF-19500 screening required |
| MMSZ4705T1G | Surface-mount SOD-123; 47 V ±5%, 500 mW rating, 100 Ω ZZT at 1 mA | Limited to lower-power applications; not drop-in replaceable due to package and power difference | Select for space-constrained PCBs where 1 W dissipation is not required |
Compared with 1N4756A and MMSZ4705T1G, the 1N4756P/TR8 delivers superior thermal performance in through-hole designs and higher surge robustness than SMD alternatives - making it optimal for industrial power rails and ruggedized analog references.
Availability
1N4756P/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning, overvoltage protection circuits, and programmable logic controller input stages requiring stable component supply and long-term lifecycle support.
Supply support for 1N4756P/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N47xxAP series was engineered for cost-effective, high-stability voltage regulation in commercial and extended-temperature applications - emphasizing JEDEC compliance, moisture resilience, and broad voltage coverage from 3.3 V to 100 V.
FAQ
What is the Zener voltage tolerance of the 1N4756P/TR8?
The 1N4756P/TR8 has a nominal Zener voltage of 47 V with a tolerance of ±5%, as indicated by the "A" suffix in its base part number. This tolerance is specified at 25°C lead temperature with 5.5 mA test current and applies across the full operating temperature range of -65°C to +150°C per Microsemi's published electrical characteristics table.
Does the 1N4756P/TR8 require dry packing before reflow soldering?
No, the 1N4756P/TR8 does not require dry packing. It is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at standard ambient conditions without desiccant or humidity-controlled packaging - simplifying inventory handling and eliminating bake-out steps prior to assembly.
What is the maximum steady-state current the 1N4756P/TR8 can regulate continuously?
The 1N4756P/TR8 supports a maximum Zener current (IZM) of 95 mA at TL < 105°C with 3/8" lead length from the body. At ambient temperatures below 45°C on FR4 board (1 oz Cu, 4 mm² pads), this corresponds to 1.0 W continuous dissipation - exceeding typical requirements for feedback and reference applications.
Can the 1N4756P/TR8 be used in surface-mount designs?
No, the 1N4756P/TR8 uses a DO-41 axial-leaded package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMAJ4756A and MLL4756A in DO-214AC and SOD-123 packages respectively - both sharing the same 47 V ±5% specification but differing in power rating and thermal performance.
Is RoHS compliance available for the 1N4756P/TR8?
Yes, RoHS-compliant versions of the 1N4756P/TR8 are available with the "e3" suffix (e.g., 1N4756P/TR8e3), featuring annealed matte-tin plating and lead-free construction certified to EU Directive 2011/65/EU. These devices maintain identical electrical and thermal specifications while supporting environmentally compliant manufacturing.
1N4756P/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):
- 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/TR8 FAQ
1.How can I place an order for 1N4756P/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4756P/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 1N4756P/TR8 reliable?
The price and inventory of 1N4756P/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4756P/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4756P/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4756P/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4756P/TR8?
1N4756P/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4756P/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 1N4756P/TR8?
For technical support, including 1N4756P/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4756P/TR8 requirements.
6.How does Aetrix verify that 1N4756P/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4756P/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 1N4756P/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4756P/TR8?
All 1N4756P/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4756P/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 1N4756P/TR8 part is unused and in its original packaging.
Return procedure for 1N4756P/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4756P/TR8 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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