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Microchip Technology 1N4757P/TR8
- Part No.:
- 1N4757P/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4757P/TR8.pdf
- Description:
- DIODE ZENER 51V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,273
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Product details
Overview
1N4757P/TR8 from Microsemi is a 1.0 W, 51 V ±5% silicon Zener diode in DO-41 plastic package, rated for 5.0 mA test current, 95 Ω dynamic impedance at IZT, and 0.25 A maximum regulator current at TA = 50°C. It provides stable voltage regulation in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N4757P/TR8 datasheet, 1N4757P/TR8 pinout, 1N4757P/TR8 application, or 1N4757P/TR8 equivalent, key selection factors include its 51 V nominal Zener voltage, DO-41 axial-leaded package with cathode band polarity marking, 1.0 W power dissipation at 25°C, and RoHS-compliant "e3" variant availability.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable reference voltage under varying load and temperature conditions. Its 51 V Zener voltage is specified at 5.0 mA test current (IZT) with ±5% tolerance (A-suffix), and exhibits 95 Ω dynamic impedance (ZZT) at that bias point.
Thermal performance is defined by 45 °C/W junction-to-lead resistance at 10 mm lead length and 105 °C/W junction-to-ambient on FR4 board (1 oz Cu, 4 mm² pad). Forward voltage is ≤1.2 V at 200 mA, and it complies with IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±5% at IZT = 5.0 mA - defines precise regulation threshold for feedback or clamping |
| Power Dissipation | 1.0 W at TL ≤ 105°C (3/8″ lead length) - sets thermal derating limit for PCB layout |
| Dynamic Impedance | 95 Ω at IZT = 5.0 mA - determines output voltage stability under current variation |
| Max Regulator Current | 0.25 A at TA = 50°C - defines safe continuous reverse conduction capability |
| Reverse Leakage | ≤5 μA at VR = 38.8 V - ensures low standby power loss in high-impedance bias networks |
| Operating Temp Range | −65°C to +150°C - supports deployment in automotive under-hood and industrial control environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in regulation circuit; reverse-biased during Zener operation |
| Cathode | Zener breakdown terminal / voltage reference output | Banded end; connected to higher-potential side; delivers regulated 51 V when reverse-biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxA registration | Industry-standard footprint and electrical behavior for drop-in compatibility in legacy designs |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body (G-suffix) variants, improving power handling in compact layouts |
| Level 1 moisture sensitivity | No dry pack required per J-STD-020B - simplifies SMT reflow and inventory management |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special handling in assembly |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator or switching converter error amplifier loop. IC Role / Device Role / Timing Role: Zener diode providing precise 51 V reference to comparator or op-amp input. Use Value: Maintains regulation accuracy within ±5% across −65°C to +150°C, enabling reliable output voltage setpoint. | Use Scenario: Protecting downstream ICs from transient voltage spikes on 48 V DC bus lines. IC Role / Device Role / Timing Role: Shunt clamp absorbing surge energy above 51 V threshold. Use Value: Limits peak voltage to 51 V + dynamic overshoot margin, preventing damage to 50 V-rated components. |
| Signal Level Translation | Current Source Bias |
Use Scenario: Generating fixed bias voltage for analog sensor interface circuits operating from unregulated 60 V supply. IC Role / Device Role / Timing Role: Zener-based voltage reference feeding precision resistor network. Use Value: Delivers stable 51 V reference with <95 Ω output impedance, minimizing signal drift due to load variation. | Use Scenario: Establishing constant current for LED driver or photodiode bias in industrial sensing modules. IC Role / Device Role / Timing Role: Zener regulating voltage across series current-setting resistor. Use Value: Enables predictable current setting (e.g., ~1 mA with 50 kΩ) with <5 μA leakage at 38.8 V, reducing error contribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4757A | No TR8 tape-and-reel suffix; bulk or ammo-pack packaging only | Same electrical specs and DO-41 package; suitable where automated placement not required | Select 1N4757A for manual prototyping or low-volume hand-soldered assemblies |
| MMBZ5255B | SOT-23 surface-mount package; 51 V ±5%, 225 mW rating; 100 Ω ZZT at 20 mA | Lower power and smaller footprint; requires PCB redesign for SMT vs. through-hole | Choose MMBZ5255B only when space-constrained PCB layout and reduced power demand justify requalification |
Compared with 1N4757A and MMBZ5255B, the 1N4757P/TR8 offers full 1.0 W power handling in standard DO-41 form factor with tape-and-reel delivery for pick-and-place manufacturing, making it optimal for high-reliability through-hole power regulation where thermal margin and legacy compatibility are critical.
Availability
1N4757P/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, and automotive body control modules requiring stable component supply and long-term obsolescence management.
Supply support for 1N4757P/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 radiation-hardened components for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed specifically for robust, cost-effective voltage regulation in harsh-environment power systems where JEDEC-standardized performance, thermal resilience, and long-lifecycle support are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N4757P/TR8?
The 1N4757P/TR8 has a nominal Zener voltage of 51 V with ±5% tolerance, as indicated by the "A" suffix in its part number per JEDEC standard. This means the actual measured VZ at 5.0 mA test current falls between 48.45 V and 53.55 V at TL = 25°C. The tolerance is guaranteed across the full operating temperature range of −65°C to +150°C.
Does the 1N4757P/TR8 require dry packing before reflow soldering?
No, the 1N4757P/TR8 does not require dry packing. It is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ambient conditions and subjected to standard reflow profiles without preconditioning. This eliminates moisture-related popcorning risk and simplifies logistics for high-mix manufacturing.
What is the maximum continuous reverse current the 1N4757P/TR8 can handle?
The 1N4757P/TR8 supports a maximum regulator current (IZM) of 0.25 A at ambient temperature TA = 50°C when mounted on an FR4 PCB with specified copper area. At 25°C lead temperature (TL), its 1.0 W power rating allows up to ~19.6 mA average current at 51 V, but thermal derating must be applied per Figure 1 in the datasheet for sustained operation.
How does the "P" and "TR8" in 1N4757P/TR8 affect its specifications?
The "P" suffix denotes plastic DO-41 packaging (vs. glass "G"), offering lower thermal resistance; "TR8" indicates tape-and-reel packaging per EIA-296 with 8 mm carrier tape-no electrical or thermal specification changes. Both suffixes preserve identical Zener voltage, impedance, and reliability characteristics of the base 1N4757A device.
Is the 1N4757P/TR8 RoHS compliant?
Yes, the 1N4757P/TR8 is RoHS compliant. Microsemi offers this part with annealed matte-tin plating per MIL-STD-750 Method 2026, and the "e3" suffix explicitly denotes RoHS compliance. While the base part number omits "e3", all current production lots meet RoHS Directive 2011/65/EU requirements including lead content limits.
1N4757P/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):
- 51 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 38.8 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)
1N4757P/TR8 FAQ
1.How can I place an order for 1N4757P/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4757P/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 1N4757P/TR8 reliable?
The price and inventory of 1N4757P/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4757P/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4757P/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4757P/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4757P/TR8?
1N4757P/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4757P/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 1N4757P/TR8?
For technical support, including 1N4757P/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4757P/TR8 requirements.
6.How does Aetrix verify that 1N4757P/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4757P/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 1N4757P/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4757P/TR8?
All 1N4757P/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4757P/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 1N4757P/TR8 part is unused and in its original packaging.
Return procedure for 1N4757P/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4757P/TR8 Tags
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