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Microchip Technology SMAJ4758AE3/TR13
- Part No.:
- SMAJ4758AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4758AE3/TR13.pdf
- Description:
- DIODE ZENER 56V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,357
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Product details
Overview
SMAJ4758AE3/TR13 from Microsemi (now Microchip) is a 2 W surface-mount Zener diode with a nominal zener voltage of 56 V ±5%, 4.5 mA test current, 110 Ω dynamic impedance at IZT, and 80 A peak surge current capability. It serves as a precision voltage regulator or overvoltage clamp in DC power rails for industrial control modules.
For engineers reviewing the SMAJ4758AE3/TR13 datasheet, SMAJ4758AE3/TR13 pinout, SMAJ4758AE3/TR13 application, or SMAJ4758AE3/TR13 equivalent, key selection criteria include its DO-214AC package compatibility, 56 V regulation tolerance, thermal resistance of 25 °C/W, and compliance with JEDEC 1N47xxA equivalents for legacy design migration.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across load variations. Its 56 V nominal zener voltage is specified at 4.5 mA test current (IZT) with 110 Ω dynamic impedance (ZZT), ensuring predictable regulation under moderate current shifts.
It supports high-energy transient suppression with 80 A peak surge current (IS) per 1/120 s half-sine pulse and maintains operation from –55 °C to +150 °C. The device uses a cathode-band polarity indicator and meets MIL-STD-750 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±5% - precise clamping threshold for 54–58 V DC rails |
| Test Current (IZT) | 4.5 mA - standard bias point for voltage specification and impedance measurement |
| Dynamic Impedance (ZZT) | 110 Ω @ IZT - low incremental resistance ensures minimal voltage shift under load changes |
| Peak Surge Current (IS) | 80 A - handles short-duration transients like ESD or inductive kickback |
| Power Dissipation (PAV) | 2.0 W - sustained regulation capability on 4.0 mm² copper pads per terminal |
| Operating Temperature | –55 °C to +150 °C - suitable for under-hood automotive or industrial ambient conditions |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead thermal path enables reliable power handling with standard PCB layout |
Pinout & Package
DO-214AC (SMAJ) surface-mount package with molded plastic body, flat handling surface for pick-and-place accuracy, and cathode band marking polarity. Lead finish is matte tin; maximum solder temperature is 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lower-potential rail during Zener operation |
| Cathode | Reverse-biased Zener terminal / regulated output node | Connected to protected node; voltage referenced to anode at 56 V ±5% |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxA equivalence | Electrically identical to 1N4758A - enables drop-in replacement in legacy through-hole designs with adapter layout |
| High surge current rating | 80 A peak (1/120 s) - suppresses repetitive transients without degradation in motor drive or relay coil snubbing |
| Surface-mount flat handling surface | Accurate automated placement on SMT lines - eliminates tombstoning risk in reflow assembly |
| UL94V-0 flame retardant epoxy | Meets safety requirements for enclosed industrial enclosures and power supply housings |
Applications
| Industrial Power Supply Clamping | Automotive ECU Voltage Reference |
|---|---|
Use Scenario: Stabilizing 56 V auxiliary rail in programmable logic controller (PLC) backplane power distribution. IC Role / Device Role / Timing Role: Zener regulator providing fixed reference for op-amp feedback networks and ADC biasing. Use Value: Maintains ±5% regulation across –40 °C to +85 °C ambient with <110 Ω dynamic impedance, reducing calibration drift. | Use Scenario: Overvoltage protection for microcontroller I/O pins exposed to 12 V battery line transients in engine control units. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping spikes above 56 V to prevent latch-up or gate oxide damage. Use Value: Withstands 80 A surge pulses without parameter shift, meeting ISO 7637-2 Pulse 1/2a immunity requirements. |
| DC Motor Field Coil Snubber | Telecom Line Card Protection |
Use Scenario: Suppressing inductive kickback from 48 V DC shunt-wound motor field windings during PWM switching. IC Role / Device Role / Timing Role: Energy-dissipating clamp limiting flyback voltage to 56 V during turn-off transitions. Use Value: 2 W steady-state dissipation and 25 °C/W RθJL enable continuous snubbing without thermal runaway at 1 kHz PWM. | Use Scenario: Protecting analog front-end components on 48 V PoE-powered line cards from lightning-induced surges. IC Role / Device Role / Timing Role: Primary-stage Zener clamp before TVS diode array, setting upper voltage ceiling. Use Value: 56 V VZ provides margin above 48 V nominal while allowing downstream TVS to handle sub-56 V fast transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4758A | Through-hole DO-41 package; same 56 V ±5%, 4.5 mA IZT, 110 Ω ZZT, but 1 W power rating | Requires PCB redesign for leaded mounting; lower surge rating (40 A vs. 80 A) | Choose for cost-sensitive legacy repairs where SMT is unavailable |
| MMSZ5255B | SOD-123 package; 56 V ±5%, but only 0.5 W power rating and 300 Ω ZZT | Limited to low-power signal-level clamping; unsuitable for 2 W rail regulation | Choose only for space-constrained signal conditioning, not power rail stabilization |
Compared with 1N4758A and MMSZ5255B, SMAJ4758AE3/TR13 uniquely combines 2 W power handling, 80 A surge capability, and DO-214AC SMT compatibility-making it the sole option for high-reliability, surface-mount 56 V regulation in industrial power systems.
Availability
SMAJ4758AE3/TR13 is available at Aetrix Electronics and suitable for industrial power supply clamping, automotive ECU protection, and DC motor snubbing requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ4758AE3/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 robust, surface-mount Zener regulation in harsh-environment power systems-targeting industrial automation, transportation, and telecom infrastructure where thermal stability and surge resilience are critical.
FAQ
What is the zener voltage tolerance for SMAJ4758AE3/TR13?
The SMAJ4758AE3/TR13 has a nominal zener voltage of 56 V with a tolerance of ±5%, as confirmed in the Electrical Characteristics table. This tolerance applies at 25 °C with 4.5 mA test current (IZT). No suffix indicates 10% tolerance; the 'A' suffix in SMAJ4758A denotes 5%, and this is retained in the E3/TR13 variant. The SMAJ4758AE3/TR13 must be used within this 53.2–58.8 V window for compliant regulation.
Is SMAJ4758AE3/TR13 compatible with JEDEC 1N4758A in circuit design?
Yes, SMAJ4758AE3/TR13 is electrically equivalent to 1N4758A per the manufacturer's documentation, sharing identical zener voltage (56 V ±5%), test current (4.5 mA), and dynamic impedance (110 Ω). However, SMAJ4758AE3/TR13 uses DO-214AC packaging versus DO-41, so board layout must accommodate SMT footprints-not direct pin-for-pin replacement without adapter design.
What is the maximum surge current rating for SMAJ4758AE3/TR13?
The SMAJ4758AE3/TR13 supports a peak surge current (IS) of 80 A, measured using a 1/120 second half-sine wave pulse at 25 °C ambient. This rating is validated per Note 3 in the datasheet and reflects capability to absorb transient energy from inductive loads or ESD events without parameter shift or failure.
Does SMAJ4758AE3/TR13 meet UL94V-0 flammability requirements?
Yes, SMAJ4758AE3/TR13 uses flame-retardant epoxy conforming to UL94V-0, as stated in the Mechanical Data section. This certification confirms self-extinguishing behavior after ignition source removal-critical for use in enclosed industrial power supplies and automotive ECUs where fire safety compliance is mandated.
What is the thermal resistance junction-to-lead (RθJL) for SMAJ4758AE3/TR13?
The thermal resistance junction-to-lead (RθJL) for SMAJ4758AE3/TR13 is 25 °C/W, specified under Maximum Ratings with mounting on 4.0 mm² copper pads per terminal. This value defines the temperature rise from junction to lead under steady-state 2 W dissipation and informs heatsinking decisions in high-ambient environments.
SMAJ4758AE3/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):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 110 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 42.6 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
SMAJ4758AE3/TR13 FAQ
1.How can I place an order for SMAJ4758AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4758AE3/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 SMAJ4758AE3/TR13 reliable?
The price and inventory of SMAJ4758AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4758AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4758AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4758AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4758AE3/TR13?
SMAJ4758AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4758AE3/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 SMAJ4758AE3/TR13?
For technical support, including SMAJ4758AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4758AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4758AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4758AE3/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 SMAJ4758AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4758AE3/TR13?
All SMAJ4758AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4758AE3/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 SMAJ4758AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4758AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4758AE3/TR13 Tags
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