My Inquiry
My Account
Microchip Technology SMAJ4757CE3/TR13
- Part No.:
- SMAJ4757CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4757CE3/TR13.pdf
- Description:
- DIODE ZENER 51V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,424
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ4757CE3/TR13 from Microsemi (now Microchip) is a 2 W surface-mount Zener diode with a nominal zener voltage of 51 V ±2%, 5.0 mA test current, 95 Ω dynamic impedance at IZT, and 0.25 mA maximum reverse leakage at 38.8 V. It is used for precision voltage regulation and overvoltage protection in DC power rails of industrial control modules.
For engineers reviewing the SMAJ4757CE3/TR13 datasheet, SMAJ4757CE3/TR13 pinout, SMAJ4757CE3/TR13 application, or SMAJ4757CE3/TR13 equivalent, key selection criteria include its ±2% voltage tolerance, DO-214AC package thermal resistance (25°C/W), 1500 mA peak surge current rating, and cathode-band polarity marking for unambiguous PCB orientation.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage across load circuits. Its 51 V nominal zener voltage is specified at 5.0 mA (IZT) with 95 Ω dynamic impedance, ensuring stable regulation under moderate load variations.
Designed for surface-mount assembly on FR-4 PCBs with 4.0 mm² copper pads per terminal, it supports steady-state power dissipation of 2.0 W at TL ≤ 100°C and derates linearly to zero at 150°C junction temperature, with maximum soldering temperature of 260°C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±2% at 5.0 mA - enables precise 51 V rail clamping with tight tolerance for safety-critical regulation |
| Power Dissipation (PAV) | 2.0 W - requires 4.0 mm² copper pad per terminal for thermal management at full rating |
| Dynamic Impedance (ZZT) | 95 Ω at IZT = 5.0 mA - defines voltage deviation under small-signal load transients |
| Peak Surge Current (IS) | 1500 mA - withstands ½-sine 1/120 s surges common in automotive load-dump events |
| Reverse Leakage (IR) | 0.25 µA max at 38.8 V - ensures minimal standby power loss in high-impedance bias networks |
| Junction Temperature Range | –55°C to +150°C - supports operation in under-hood and industrial ambient environments |
Pinout & Package
DO-214AC (SMAJ) surface-mount package with molded epoxy body, cathode band marking, and two terminals: anode and cathode. Polarity is unambiguously indicated by the cathode band; no internal circuitry or additional pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of regulated node; carries forward current during non-regulation states |
| Cathode | Reverse breakdown terminal | Connected to higher-potential side; establishes 51 V reference when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter regulation margins than standard 5% parts, reducing need for post-regulation trimming |
| DO-214AC mechanical compatibility | Matches JEDEC DO-214AC footprint with extended dimension A (up to 2.92 mm), ensuring board-level interchangeability |
| 1500 mA peak surge rating | Supports IEC 61000-4-5 Level 3 surge immunity without external series impedance |
| Cathode band polarity marking | Eliminates orientation errors during automated placement, critical for high-yield SMT manufacturing |
Applications
| Industrial Power Supply Protection | Automotive ECU Voltage Clamping |
|---|---|
Use Scenario: Protecting 48 V DC input rails in programmable logic controllers against transient overvoltages. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and transient voltage suppressor. Use Value: Clamps input to ≤51 V during 100 V/1 µs transients, preventing damage to downstream DC-DC converters rated for 60 V max. | Use Scenario: Stabilizing reference voltage for analog sensor signal conditioning in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference source with low dynamic impedance. Use Value: Maintains <±0.5 V drift over –40°C to +125°C ambient, enabling accurate ADC biasing for oxygen sensors. |
| Telecom Line Card Surge Suppression | Medical Equipment Overvoltage Guard |
Use Scenario: Absorbing lightning-induced surges on 48 V telecom distribution backplanes. IC Role / Device Role / Timing Role: Primary shunt surge protector on power entry stage. Use Value: Withstands 1500 mA 8/20 µs surges per IEC 61000-4-5, eliminating need for TVS arrays in cost-sensitive designs. | Use Scenario: Safeguarding isolated patient-monitoring front-end amplifiers from defibrillator pulse coupling. IC Role / Device Role / Timing Role: Secondary overvoltage limiter after primary isolation barrier. Use Value: Limits coupled transients to <55 V, preserving 60 V-rated op-amp input stages and meeting IEC 60601-1 creepage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4757A | Same 51 V nominal voltage but ±5% tolerance; DO-41 through-hole package | Requires PCB redesign for through-hole mounting; lacks surface-mount thermal performance | Select only if legacy through-hole assembly is mandated and ±5% regulation tolerance is acceptable |
| BZX84-C51 | 51 V ±5% in SOT-23; 300 mW power rating; 170 Ω ZZT | Insufficient for 2 W continuous dissipation; limited to low-power bias networks | Use only in space-constrained, low-current (<10 mA) reference applications where 2 W capability is unnecessary |
Compared with 1N4757A and BZX84-C51, SMAJ4757CE3/TR13 delivers tighter ±2% voltage tolerance, 2 W power handling in a surface-mount DO-214AC package, and 1500 mA surge capability-making it uniquely suitable for industrial and automotive power-rail protection where precision, power, and ruggedness are jointly required.
Availability
SMAJ4757CE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, telecom line cards, and medical equipment requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for SMAJ4757CE3/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 and mixed-signal components for aerospace, defense, and industrial markets.
The SMAJ47xx series was designed specifically for surface-mount voltage regulation and transient suppression in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and tight parametric control.
FAQ
What is the zener voltage tolerance of SMAJ4757CE3/TR13?
SMAJ4757CE3/TR13 has a nominal zener voltage of 51 V with a ±2% tolerance, denoted by the 'C' suffix in the part number. This tighter tolerance is confirmed in the manufacturer's datasheet MSC0284A.PDF, Note 1, and distinguishes it from standard ±5% variants like SMAJ4757A. The 51 V specification is measured at 5.0 mA test current and thermal equilibrium conditions.
What package type does SMAJ4757CE3/TR13 use?
SMAJ4757CE3/TR13 uses the DO-214AC (SMAJ) surface-mount package, with mechanical dimensions conforming to JEDEC standards except for dimension 'A', which extends to 2.92 mm maximum. The package features a flat handling surface for accurate pick-and-place, cathode band polarity marking, and is rated for soldering at 260°C for 10 seconds per MIL-STD-750 Method 2026.
What is the maximum steady-state power dissipation for SMAJ4757CE3/TR13?
The maximum steady-state power dissipation for SMAJ4757CE3/TR13 is 2.0 W at lead temperature ≤100°C, mounted on 4.0 mm² copper pads per terminal. Power rating derates linearly to zero at 150°C junction temperature. This value is specified in the Maximum Ratings table of the official datasheet MSC0284A.PDF and is critical for thermal layout validation.
How is polarity identified on SMAJ4757CE3/TR13?
Polarity on SMAJ4757CE3/TR13 is identified by a visible cathode band on the package body, consistent with industry-standard diode marking. The banded end is the cathode terminal, and the opposite end is the anode. This marking is explicitly stated in the Mechanical Data section of the datasheet and ensures correct orientation during automated SMT placement.
What is the peak surge current rating for SMAJ4757CE3/TR13?
SMAJ4757CE3/TR13 has a peak surge current rating of 1500 mA, measured using a ½-sine wave or equivalent sine wave pulse of 1/120 second duration at 25°C ambient, as defined in Note 3 of the Electrical Characteristics table. This rating supports compliance with IEC 61000-4-5 surge immunity testing for industrial and automotive applications.
SMAJ4757CE3/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):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 2 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC
SMAJ4757CE3/TR13 FAQ
1.How can I place an order for SMAJ4757CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4757CE3/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 SMAJ4757CE3/TR13 reliable?
The price and inventory of SMAJ4757CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4757CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4757CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4757CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4757CE3/TR13?
SMAJ4757CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4757CE3/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 SMAJ4757CE3/TR13?
For technical support, including SMAJ4757CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4757CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4757CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4757CE3/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 SMAJ4757CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4757CE3/TR13?
All SMAJ4757CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4757CE3/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 SMAJ4757CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4757CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4757CE3/TR13 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
