My Inquiry
My Account
Microchip Technology SMAJ4744CE3/TR13
- Part No.:
- SMAJ4744CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4744CE3/TR13.pdf
- Description:
- DIODE ZENER 15V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,773
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ4744CE3/TR13 from SM Semiconductors is a 15.0 V, ±2% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 132 mA maximum regulator current at 100°C, and 304 A peak surge current; used for overvoltage clamping on I/O lines and power rails in industrial sensor interfaces.
For engineers reviewing the SMAJ4744CE3/TR13 datasheet, SMAJ4744CE3/TR13 pinout, SMAJ4744CE3/TR13 application, or SMAJ4744CE3/TR13 equivalent, key selection criteria include zener voltage tolerance (±2%), thermal resistance (25°C/W), reverse leakage (≤5 µA at 11.4 V), surge capability (304 A), and ROHS-compliant matte-tin plating.
Technical Context
This device operates as a precision voltage reference and transient suppressor via controlled reverse-breakdown conduction. It maintains regulation across 17.0 mA test current (IZT) with dynamic impedance of 14.0 Ω and knee impedance of 700 Ω at 0.25 mA (IZK).
Designed for unidirectional clamping, it features cathode-band polarity marking, void-free thermosetting epoxy case (UL94V-0), and junction-to-lead thermal resistance of 25°C/W - enabling reliable operation from –65°C to +150°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 15.0 V ±2% at 17.0 mA - ensures tight voltage clamping threshold for 12 V rail protection |
| Power Dissipation | 2.0 W steady-state - supports continuous regulation without forced cooling in compact layouts |
| Peak Surge Current | 304 A (1/2 sine wave, 1/120 s) - withstands lightning-induced transients per IEC 61000-4-5 |
| Reverse Leakage | ≤5 µA at 11.4 V - minimizes standby power loss in always-on sensor circuits |
| Thermal Resistance | 25°C/W junction-to-lead - enables direct PCB copper pour heat sinking for sustained 132 mA operation |
| Operating Temp | –65°C to +150°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode indicated by band, 0.3 g weight, ROHS-compliant matte-tin plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side clamp node | Connected to ground or low-impedance return path during transient suppression |
| Cathode | Reverse breakdown terminal / high-side clamp node | Connected to protected line (e.g., 12 V supply or signal trace) to clamp above 15 V |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables precise clamping within 0.3 V margin for 15 V systems, reducing design guard-banding |
| 25°C/W junction-to-lead RθJL | Allows direct thermal coupling to PCB copper, eliminating need for external heatsinks in ≤1 W average use |
| UL94V-0 void-free epoxy case | Provides flame-retardant mechanical integrity and moisture resistance in harsh industrial enclosures |
| ROHS-compliant matte-tin plating | Ensures reliable solderability per MIL-STD-750 Method 2026 and compatibility with lead-free reflow profiles |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors from load-dump transients in factory automation PLCs. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor clamping signal rail to 15 V. Use Value: Prevents ADC input saturation and op-amp latch-up during 100 V/10 ms surges per ISO 7637-2 Pulse 5a. | Use Scenario: Clamping LIN bus power supply rail against battery reversal and jump-start spikes. IC Role / Device Role / Timing Role: Zener-based overvoltage clamp on 12 V subsystem rail. Use Value: Maintains <5 µA leakage at 11.4 V to avoid draining sleep-mode current budgets. |
| Telecom Power Sequencing | Consumer Appliance Motor Driver |
Use Scenario: Safeguarding DC-DC converter feedback resistors from ESD events on 48 V telecom power modules. IC Role / Device Role / Timing Role: Precision voltage reference and transient shunt on voltage divider node. Use Value: ±2% tolerance ensures stable 48 V regulation setpoint despite temperature drift up to 150°C. | Use Scenario: Suppressing inductive kickback from brushed DC motor drivers in smart home appliances. IC Role / Device Role / Timing Role: Fast-response Zener clamp on H-bridge supply rail. Use Value: 304 A surge rating handles 500 V/10 µs transients without degradation per IEC 61000-4-4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 10% voltage tolerance (15 V ±10%), DO-41 package, higher RθJA (50°C/W) | Lower cost but looser regulation; requires larger PCB area and less thermal margin | Select when budget constraints outweigh precision and space requirements |
| BZX84-C15 | 15 V ±5%, SOT-23 package, 300 mW rating, 100 mA max IZM | Not suitable for >0.3 W continuous dissipation; limited surge handling (100 A typical) | Choose only for low-power signal-line protection where board space is critical |
Compared with 1N4744A and BZX84-C15, SMAJ4744CE3/TR13 delivers tighter voltage control, superior thermal performance, and higher surge robustness - making it optimal for industrial and automotive power-rail protection where reliability and long-term stability are mandatory.
Availability
SMAJ4744CE3/TR13 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and telecom power sequencing requiring stable component supply and long-lifecycle availability.
Supply support for SMAJ4744CE3/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
SM Semiconductors is a Taiwan-based manufacturer specializing in discrete semiconductors, including Zener diodes, TVS devices, and rectifiers, with focus on industrial-grade reliability and AEC-Q200 alignment.
The SMAJ47xxA series is designed specifically for high-energy transient suppression in power rails and signal lines across automotive, industrial, and telecom infrastructure - emphasizing tight tolerance, surge resilience, and thermal robustness.
FAQ
What is the exact zener voltage and tolerance of SMAJ4744CE3/TR13?
SMAJ4744CE3/TR13 has a nominal zener voltage of 15.0 V with a ±2% tolerance, verified at 17.0 mA test current (IZT) per the official SM Semiconductors datasheet. This tight tolerance ensures predictable clamping behavior in precision 12 V and 15 V system protection, distinguishing it from standard 10% tolerance variants like SMAJ4744A.
Does SMAJ4744CE3/TR13 meet ROHS and lead-free assembly requirements?
Yes, SMAJ4744CE3/TR13 uses ROHS-compliant annealed matte-tin plating on its leads, qualified for lead-free reflow soldering per J-STD-020 and compatible with MIL-STD-750 Method 2026 solderability testing. The UL94V-0 epoxy case further supports environmentally compliant manufacturing.
What is the maximum continuous current SMAJ4744CE3/TR13 can regulate at 100°C?
At 100°C case temperature, SMAJ4744CE3/TR13 supports a maximum regulator current (IZM) of 132 mA, derived from its 2.0 W power rating and thermal resistance. This value assumes adequate PCB copper heat sinking - direct thermal coupling reduces junction temperature rise and sustains regulation under sustained overload conditions.
How does the 25°C/W thermal resistance of SMAJ4744CE3/TR13 impact PCB layout?
The 25°C/W junction-to-lead thermal resistance of SMAJ4744CE3/TR13 means that every 1 W of dissipated power raises the junction temperature by 25°C above lead temperature. To maintain reliability, designers must connect the cathode/anode pads to ≥1 cm² internal or external copper planes - enabling passive cooling without heatsinks in most industrial applications.
Can SMAJ4744CE3/TR13 be used for bidirectional transient suppression?
No, SMAJ4744CE3/TR13 is a unidirectional Zener diode intended for single-polarity clamping (cathode to protected line, anode to ground). For bidirectional protection, a pair of SMAJ4744CE3/TR13 devices in series opposition or a dedicated bidirectional TVS like SMAJ15CA would be required - SMAJ4744CE3/TR13 alone does not conduct symmetrically in forward and reverse bias.
SMAJ4744CE3/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):
- 15 V
- Tolerance:
- ±2%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 14 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 11.4 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
SMAJ4744CE3/TR13 FAQ
1.How can I place an order for SMAJ4744CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4744CE3/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 SMAJ4744CE3/TR13 reliable?
The price and inventory of SMAJ4744CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4744CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4744CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4744CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4744CE3/TR13?
SMAJ4744CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4744CE3/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 SMAJ4744CE3/TR13?
For technical support, including SMAJ4744CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4744CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4744CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4744CE3/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 SMAJ4744CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4744CE3/TR13?
All SMAJ4744CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4744CE3/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 SMAJ4744CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4744CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4744CE3/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…
