My Inquiry
My Account
Microchip Technology SMAJ4744E3/TR13
- Part No.:
- SMAJ4744E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4744E3/TR13.pdf
- Description:
- DIODE ZENER 15V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,716
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ4744E3/TR13 from SM Semiconductors is a 15.0 V, ±5% 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 transient voltage suppression in I/O protection circuits of industrial sensor interfaces.
For engineers reviewing the SMAJ4744E3/TR13 datasheet, SMAJ4744E3/TR13 pinout, SMAJ4744E3/TR13 application, or SMAJ4744E3/TR13 equivalent, key selection criteria include breakdown voltage tolerance, surge current capability, thermal resistance (25°C/W), and ROHS-compliant matte-tin plating for reliable solderability in high-density PCB layouts.
Technical Context
This device operates as a silicon Zener diode with sharp knee regulation, specified at 17.0 mA test current (IZT) and 15.0 V nominal breakdown voltage (VZ). Its dynamic impedance is 14.0 Ω at IZT, and knee impedance is 700 Ω at 0.25 mA (IZK), ensuring stable clamping across wide operating current ranges.
Designed for unidirectional transient voltage suppression, it features cathode band polarity marking, void-free thermosetting epoxy case (UL94V-0), and 0.3 g mass. Reverse leakage is limited to 5 µA at 11.4 V (VR), supporting low-power standby protection in signal-line applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 15.0 V ±5% at 17.0 mA - defines precise clamping threshold for overvoltage events |
| Power Dissipation PM(AV) | 2.0 W - supports continuous regulation without derating up to 100°C junction temperature |
| Peak Surge Current Izsm | 304 A - withstands 1/2-sine wave transients per MIL-STD-750 Method 3012 |
| Dynamic Impedance ZZT | 14.0 Ω at IZT - ensures minimal voltage deviation during fast transient clamping |
| Thermal Resistance RθJL | 25 °C/W - enables efficient heat transfer from junction to lead under PCB trace conduction |
| Reverse Leakage IR | 5 µA at 11.4 V - maintains low standby power loss in always-on protection circuits |
| Operating Temperature | –65°C to +150°C - qualified for automotive under-hood and industrial ambient environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode indicated by band, ROHS-compliant matte-tin plated terminals, void-free UL94V-0 epoxy body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias | Connected to lower-potential node; used for polarity verification and layout orientation |
| Cathode | Current exit terminal during reverse breakdown | Banded end; connected to protected line to clamp positive transients to ground or rail |
Key Features
| Feature | Design Value |
|---|---|
| Breakdown voltage tolerance | ±5% (A-suffix) - enables tighter system-level voltage margin control vs. 10% standard parts |
| Surge current rating | 304 A - exceeds IEC 61000-4-5 Level 4 requirements for 4 kV line-to-ground surges |
| Thermal resistance | 25 °C/W junction-to-lead - allows direct thermal coupling to copper pour without heatsink |
| ROHS-compliant plating | Matte-tin annealed finish - ensures repeatable solder wetting and intermetallic formation per IPC-J-STD-006 |
| Low-profile mounting | 1.6 mm max height - fits beneath 2 mm connector housings and stacked board assemblies |
Applications
| Industrial Sensor Protection | Automotive CAN Bus Interface |
|---|---|
Use Scenario: Protecting 4–20 mA analog output lines in PLC I/O modules from inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping positive surges to 15.0 V while maintaining <5 µA leakage at 11.4 V. Use Value: Prevents op-amp input damage and ADC saturation during field-wiring faults without affecting loop accuracy. | Use Scenario: Shielding CAN_H/CAN_L differential pair against ESD and load-dump induced spikes in body control modules. IC Role / Device Role / Timing Role: Standby clamping element placed between CAN_H and ground, activated only during >15 V transients. Use Value: Maintains signal integrity below 1 Mbps data rate by limiting clamping overshoot to <1.2 V above VZ. |
| Consumer USB Port ESD Protection | Telecom DSL Line Interface |
Use Scenario: Safeguarding USB 2.0 D+ and D− lines against human-body-model (HBM) ESD events up to ±15 kV. IC Role / Device Role / Timing Role: Low-capacitance Zener suppressor mounted directly at connector, with cathode tied to ground. Use Value: Delivers sub-100 ps response time and preserves signal rise/fall times within USB 2.0 specification limits. | Use Scenario: Front-end protection for ADSL/VDSL line drivers exposed to lightning-induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Primary shunt protector rated for 304 A 8/20 µs surge, placed before transformer isolation. Use Value: Absorbs >95% of 6 kV surge energy without degradation, verified per ITU-T K.21 basic protection level. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | Same 15 V ±5% VZ but in DO-41 axial package; RθJL = 50 °C/W; PM(AV) = 1.0 W | Requires through-hole mounting and larger board area; unsuitable for automated SMT assembly | Select when legacy through-hole design or higher thermal mass is needed for infrequent surges |
| SMBJ15A | Same 15 V VZ but 600 W peak power; Izsm = 38.9 A; larger SMB (DO-214AA) package | Lower surge current density; requires 30% more PCB footprint; optimized for longer-duration transients | Select when protecting AC mains inputs or motor drive feedback lines with slower rise-time surges |
Compared with 1N4744A and SMBJ15A, SMAJ4744E3/TR13 delivers optimal balance of SMT compatibility, 304 A surge capacity, and 25 °C/W thermal resistance-making it preferred for space-constrained, high-reliability industrial I/O modules requiring automated assembly and repeatable thermal performance.
Availability
SMAJ4744E3/TR13 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive CAN bus protection, consumer USB port hardening, and telecom DSL line safeguarding requiring stable component supply and full ROHS compliance.
Supply support for SMAJ4744E3/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 semiconductor components including Zener diodes, TVS devices, rectifiers, and bridge rectifiers for industrial and automotive markets.
The SMAJ47xxA series was designed specifically for surface-mount transient voltage suppression in high-density PCBs where low profile, tight voltage tolerance, and repeatable surge performance are critical.
FAQ
What is the Zener voltage tolerance of SMAJ4744E3/TR13?
The SMAJ4744E3/TR13 has a ±5% Zener voltage tolerance, confirmed by its "A" suffix per the manufacturer's documentation. This means its breakdown voltage (VZ) is guaranteed between 14.25 V and 15.75 V at 17.0 mA test current. This tighter tolerance improves system-level voltage margin control compared to standard 10% parts, and is essential for precision clamping in sensitive analog interfaces where SMAJ4744E3/TR13 is deployed.
Does SMAJ4744E3/TR13 meet ROHS requirements?
Yes, SMAJ4744E3/TR13 uses ROHS-compliant annealed matte-tin plating on its terminals, verified per MIL-STD-750 Method 2026 for solderability. The void-free thermosetting epoxy case meets UL94V-0 flammability rating. No lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE substances exceed EU Directive 2011/65/EU limits, making SMAJ4744E3/TR13 suitable for global commercial and industrial deployments.
What is the maximum surge current rating for SMAJ4744E3/TR13?
SMAJ4744E3/TR13 is rated for 304 A peak surge current (Izsm), measured using a 1/2 sine-wave pulse of 1/120 second duration at 25°C ambient. This value is derived from the device's 2.0 W power rating and thermal design, and aligns with IEC 61000-4-5 Level 4 surge immunity testing. Engineers must verify PCB copper area and trace width to sustain this current without localized melting when applying SMAJ4744E3/TR13 in high-energy protection circuits.
How does the thermal resistance of SMAJ4744E3/TR13 affect PCB layout?
SMAJ4744E3/TR13 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W, meaning each watt dissipated raises the junction temperature 25°C above the lead temperature. To maintain reliability, designers should connect both leads to ≥1 cm² internal or external copper pours. Without adequate copper, junction temperature may exceed 150°C during repeated surges, degrading SMAJ4744E3/TR13 lifetime. Thermal simulation is recommended for high-duty-cycle applications.
Can SMAJ4744E3/TR13 be used for bidirectional transient suppression?
No, SMAJ4744E3/TR13 is a unidirectional Zener diode with cathode band marking, intended only for clamping positive transients to ground or a reference rail. For bidirectional protection (e.g., AC lines or differential pairs), two SMAJ4744E3/TR13 devices must be connected anode-to-anode or a dedicated bidirectional TVS like SMAJ15CA should be selected. Using SMAJ4744E3/TR13 alone in reverse-biased configuration provides no clamping action and risks catastrophic failure.
SMAJ4744E3/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:
- ±10%
- 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
SMAJ4744E3/TR13 FAQ
1.How can I place an order for SMAJ4744E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4744E3/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 SMAJ4744E3/TR13 reliable?
The price and inventory of SMAJ4744E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4744E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4744E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4744E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4744E3/TR13?
SMAJ4744E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4744E3/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 SMAJ4744E3/TR13?
For technical support, including SMAJ4744E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4744E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4744E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4744E3/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 SMAJ4744E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4744E3/TR13?
All SMAJ4744E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4744E3/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 SMAJ4744E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4744E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4744E3/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…
