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Microchip Technology SMAJ4755E3/TR13
- Part No.:
- SMAJ4755E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4755E3/TR13.pdf
- Description:
- DIODE ZENER 43V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,721
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Product details
Overview
SMAJ4755E3/TR13 from Microsemi (now Microchip Technology) is a 2 W, 43 V ±5% Zener diode in DO-214AC (SMA) package, rated for 110 mA peak surge current and 44 mA maximum regulator current at 100°C, used for voltage regulation and overvoltage protection in DC power rails and interface circuits.
For engineers reviewing the SMAJ4755E3/TR13 datasheet, SMAJ4755E3/TR13 pinout, SMAJ4755E3/TR13 application, or SMAJ4755E3/TR13 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (25°C/W), cathode-band polarity marking, JEDEC DO-214AC mechanical compatibility, and UL94V-0 flame-retardant epoxy compliance.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under regulated current conditions. It features a sharp knee impedance (ZZK = 1500 Ω @ IZK = 0.25 mA) and low dynamic impedance (ZZT = 70 Ω @ IZT = 6.0 mA), enabling precise clamping in transient suppression and feedback loops.
Designed for surface-mount assembly with flat handling surface and MIL-STD-750 solderability, it supports reflow profiles up to 260°C for 10 seconds and operates across –55°C to +150°C junction temperature range with derating above 100°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V ±5% - defines clamping threshold for overvoltage protection and reference stability |
| Test Current (IZT) | 6.0 mA - operating point where VZ and ZZT are specified; sets minimum bias for regulation |
| Dynamic Impedance (ZZT) | 70 Ω @ 6.0 mA - determines voltage deviation under load variation; critical for tight-tolerance regulation |
| Max Regulator Current (IZM) | 44 mA @ TL = 100°C - maximum continuous DC current before thermal derating begins |
| Peak Surge Current (IS) | 110 mA - ½-sine wave rating for transient energy absorption (1/120 s duration) |
| Power Dissipation (PAV) | 2.0 W - steady-state limit on 4.0 mm² copper pads; requires thermal pad layout per datasheet |
| Junction Temperature Range | –55°C to +150°C - enables use in automotive under-hood and industrial control environments |
Pinout & Package
DO-214AC (SMA) surface-mount package with molded plastic body, cathode band marking on one end, and two terminals: anode (unmarked end) and cathode (banded end). Polarity must be observed during PCB layout to ensure correct reverse-bias operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to lower potential node; carries forward current when biased < 1.2 V |
| Cathode | Zener breakdown terminal / high-side connection | Connected to higher potential node; conducts in reverse when voltage exceeds 43 V |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC DO-214AC mechanical compatibility | Enables drop-in replacement for legacy 1N47xxA parts and standard SMT pick-and-place tooling |
| UL94V-0 flame-retardant epoxy | Meets safety requirements for consumer and industrial end equipment without additional conformal coating |
| High surge current rating (110 mA) | Supports IEC 61000-4-5 Level 3/4 surge immunity in secondary-side protection circuits |
| Sharp knee impedance (1500 Ω @ 0.25 mA) | Ensures predictable turn-on behavior at low bias, improving accuracy in precision reference applications |
Applications
| DC Power Rail Protection | Feedback Reference in SMPS |
|---|---|
Use Scenario: Clamping transient spikes on 48 V telecom power distribution boards. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector downstream of DC-DC converters. Use Value: Limits voltage excursions to ≤45.15 V (43 V × 1.05) during ESD or load-dump events, preventing MOSFET gate oxide failure. | Use Scenario: Providing stable 43 V reference for optocoupler-based feedback in isolated flyback converters. IC Role / Device Role / Timing Role: Precision voltage reference source setting output regulation threshold. Use Value: Maintains ±5% output voltage accuracy across temperature due to low ZZT and sharp knee characteristics. |
| Interface Line Clamp | Industrial Sensor Biasing |
Use Scenario: Protecting RS-485 transceiver inputs against induced surges in factory automation cabling. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor (TVS-like function) on data lines. Use Value: Absorbs 110 mA surge pulses without degradation, preserving signal integrity and IC reliability. | Use Scenario: Biasing high-voltage analog sensors requiring stable 43 V excitation in process control systems. IC Role / Device Role / Timing Role: Low-noise, thermally stable voltage reference for sensor front-end circuitry. Use Value: Delivers <1.2 V forward drop and 25°C/W thermal resistance, minimizing self-heating drift in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4755A | Same 43 V ±5%, but in DO-41 through-hole package; higher RθJA (~65°C/W) | Requires manual or wave soldering; unsuitable for high-density SMT layouts | Select when board space allows through-hole mounting and thermal management uses heatsinking rather than copper area |
| MMSZ43ET1G | 43 V ±5%, SOD-123 package; lower PAV (500 mW); ZZT = 90 Ω @ 5 mA | Lower power handling limits use to low-current references (<10 mA) and non-surge environments | Select when footprint size is critical and surge immunity is not required; verify thermal design for ambient >85°C |
Compared with 1N4755A and MMSZ43ET1G, SMAJ4755E3/TR13 uniquely balances 2 W power dissipation, DO-214AC SMT compatibility, and 110 mA surge capability-making it optimal for industrial power rail protection where both density and robustness are required.
Availability
SMAJ4755E3/TR13 is available at Aetrix Electronics and suitable for DC power rail protection, feedback reference in SMPS, interface line clamp, and industrial sensor biasing requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ4755E3/TR13 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 (acquired by Microchip Technology in 2018) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components.
The SMAJ47xxA series was designed for industrial-grade voltage regulation and transient suppression, targeting applications demanding JEDEC-compatibility, wide temperature operation, and repeatable Zener performance in harsh environments.
FAQ
What is the Zener voltage tolerance for SMAJ4755E3/TR13?
The SMAJ4755E3/TR13 has a nominal Zener voltage of 43 V with a tolerance of ±5%, as indicated by the absence of a tolerance suffix (e.g., 'C' for ±2% or 'D' for ±1%). This tolerance applies at thermal equilibrium after 90 seconds of DC current application, per datasheet Note 4.
Is SMAJ4755E3/TR13 compatible with automated SMT assembly?
Yes, SMAJ4755E3/TR13 is fully compatible with automated SMT assembly. Its DO-214AC (SMA) package features a flat handling surface for accurate placement, meets MIL-STD-750 solderability standards, and supports reflow profiles up to 260°C for 10 seconds-matching industry-standard lead-free processes.
What is the maximum steady-state power dissipation for SMAJ4755E3/TR13?
The maximum steady-state power dissipation for SMAJ4755E3/TR13 is 2.0 W when mounted on 4.0 mm² copper pads per terminal. Power must be linearly derated above 100°C lead temperature, reaching zero at 150°C, as defined in Note 3 of the datasheet.
How does the knee impedance of SMAJ4755E3/TR13 affect its performance?
The knee impedance of SMAJ4755E3/TR13 is 1500 Ω measured at 0.25 mA test current (IZK). This low knee impedance ensures a sharp, well-defined breakdown onset-critical for stable regulation at light loads and improved noise rejection in precision reference circuits.
Can SMAJ4755E3/TR13 replace 1N4755A in existing designs?
SMAJ4755E3/TR13 provides electrical equivalence to 1N4755A per datasheet Note 5, but differs mechanically: SMAJ4755E3/TR13 uses DO-214AC (SMA) surface-mount packaging versus DO-41 through-hole. PCB redesign is required; however, thermal and electrical behavior-including VZ, ZZT, and IS-is functionally matched.
SMAJ4755E3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±10%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 32.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC
SMAJ4755E3/TR13 FAQ
1.How can I place an order for SMAJ4755E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4755E3/TR13 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 SMAJ4755E3/TR13 reliable?
The price and inventory of SMAJ4755E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4755E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4755E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4755E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4755E3/TR13?
SMAJ4755E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4755E3/TR13 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 SMAJ4755E3/TR13?
For technical support, including SMAJ4755E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4755E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4755E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4755E3/TR13 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 SMAJ4755E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4755E3/TR13?
All SMAJ4755E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4755E3/TR13, 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 SMAJ4755E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4755E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4755E3/TR13 Tags
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