My Inquiry
My Account
Microchip Technology SMAJ4740E3/TR13
- Part No.:
- SMAJ4740E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4740E3/TR13.pdf
- Description:
- DIODE ZENER 10V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,190
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ4740E3/TR13 from SM Semiconductors is a 10.0 V, ±5% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 182 mA maximum regulator current at 100°C, and 454 mA peak surge current; used for overvoltage clamping on I/O lines in industrial sensor interfaces.
For engineers reviewing the SMAJ4740E3/TR13 datasheet, SMAJ4740E3/TR13 pinout, SMAJ4740E3/TR13 application, or SMAJ4740E3/TR13 equivalent, key selection criteria include breakdown voltage tolerance, thermal resistance (25°C/W), reverse leakage at 7.6 V, dynamic impedance at 25 mA test current, and surge current capability under 1/2-sine 1/120 s pulse conditions.
Technical Context
This device operates as a silicon planar Zener diode with sharp knee regulation, designed for transient voltage suppression and precision DC voltage reference. It maintains stable breakdown across 25–100°C ambient, with specified Zener impedance (7.0 Ω at 25 mA) and low knee impedance (0.25 Ω at 1.0 mA).
Its DO-214AC package enables surface-mount compatibility while retaining axial-lead mounting flexibility; cathode band polarity marking and UL94V-0 epoxy body support reliability in high-density PCB layouts subject to ESD and inductive switching transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 10.0 V ±5% at 25 mA - defines precise clamping threshold for 12 V rail protection |
| Power Dissipation | 2.0 W steady-state - supports continuous regulation without heatsink up to ~80°C ambient |
| Max Surge Current | 454 mA (1/2-sine, 1/120 s) - withstands typical inductive switch-off transients per IEC 61000-4-5 |
| Dynamic Impedance | 7.0 Ω at IZT = 25 mA - ensures minimal voltage shift under load variation |
| Reverse Leakage | 10 µA max at VR = 7.6 V - guarantees low standby power loss in always-on sensor circuits |
| Thermal Resistance | 25 °C/W junction-to-lead - enables accurate thermal derating in compact layouts |
Pinout & Package
Package: SMA (DO-214AC), surface-mountable thermoset epoxy case with cathode band marking; 0.3 g weight, ROHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward bias | Connected to lower-potential node; forward voltage ≤1.2 V at 200 mA |
| Cathode | Current exit during reverse breakdown | Banded end; clamps voltage to 10.0 V when reverse voltage exceeds breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Ensures predictable clamping within ±0.5 V of 10.0 V nominal, critical for tight-margin 12 V system designs |
| 2.0 W power rating | Supports sustained energy absorption without thermal runaway in short-duration overvoltage events |
| Low knee impedance (0.25 Ω) | Enables stable regulation down to 1.0 mA, improving performance in ultra-low-power wake-up circuits |
| UL94V-0 epoxy encapsulation | Meets flammability safety requirements for industrial and automotive control module housings |
Applications
| Industrial Sensor Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors exposed to relay coil flyback in factory automation PLCs. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping induced spikes to ≤10.5 V during 100 ns–1 µs events. Use Value: Prevents ADC input saturation and microcontroller reset caused by >15 V transients on 0–10 V sensor outputs. | Use Scenario: Safeguarding LIN bus transceiver I/O pins against load dump and jump-start surges in door module ECUs. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing up to 454 mA surge without degradation. Use Value: Maintains signal integrity below LIN physical layer's 12 V absolute maximum rating during ISO 7637-2 Pulse 1/2a events. |
| Telecom Power Interface | Consumer Appliance Motor Driver |
Use Scenario: Regulating auxiliary 12 V supply rail feeding Ethernet PHY power management ICs in PoE-powered switches. IC Role / Device Role / Timing Role: Precision Zener reference stabilizing feedback voltage for DC-DC converter error amplifiers. Use Value: Delivers ±5% voltage accuracy over –40°C to +85°C, enabling <1% output regulation drift. | Use Scenario: Clamping gate drive lines of half-bridge MOSFETs controlling BLDC fans in smart refrigerators. IC Role / Device Role / Timing Role: Reverse-biased Zener limiting voltage overshoot during PWM turn-off transitions. Use Value: Limits dv/dt-induced Miller capacitance coupling, reducing false triggering and shoot-through risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A | Same 10 V ±5% VZ, but DO-41 through-hole package; RθJL = 50 °C/W vs. 25 °C/W | Requires PCB hole drilling; less suitable for high-density SMT assemblies | Prefer SMAJ4740E3/TR13 for space-constrained boards needing superior thermal performance |
| BZX84-C10 | 10 V ±5% in SOT-23; 350 mW power rating vs. 2.0 W; IZSM = 100 mA | Limited to low-energy transients; unsuitable for IEC 61000-4-5 Level 3 surge immunity | Select SMAJ4740E3/TR13 where sustained 2.0 W dissipation or 454 mA surge handling is required |
Compared with 1N4740A and BZX84-C10, SMAJ4740E3/TR13 delivers higher surge robustness, lower thermal resistance, and SMT compatibility-making it optimal for industrial-grade transient suppression where board area and thermal margin are constrained.
Availability
SMAJ4740E3/TR13 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, telecom power interfaces, and consumer appliance motor drivers requiring stable component supply and long-term lifecycle continuity.
Supply support for SMAJ4740E3/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 emphasis on industrial and automotive reliability standards.
The SMAJ47xxA series is engineered for high-reliability transient voltage suppression in harsh environments, targeting applications demanding stable Zener regulation across wide temperature ranges and high surge resilience.
FAQ
What is the Zener voltage tolerance of SMAJ4740E3/TR13?
SMAJ4740E3/TR13 has a ±5% Zener voltage tolerance, meaning its breakdown voltage is guaranteed between 9.5 V and 10.5 V at 25 mA test current. This tighter tolerance than standard 10% variants ensures consistent clamping behavior in precision 12 V rail protection circuits. The 'A' suffix in the full family designation confirms this 5% specification, and SMAJ4740E3/TR13 adheres strictly to that bin.
Does SMAJ4740E3/TR13 meet RoHS requirements?
Yes, SMAJ4740E3/TR13 uses ROHS-compliant annealed matte-tin plating on its terminals, verified per MIL-STD-750 Method 2026 for solderability. Its void-free thermosetting epoxy body meets UL94V-0 flammability standards, and the entire construction complies with EU Directive 2011/65/EU. No lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE substances exceed allowable thresholds in SMAJ4740E3/TR13.
What is the maximum surge current rating for SMAJ4740E3/TR13?
SMAJ4740E3/TR13 is rated for 454 mA peak surge current under standardized 1/2-sine wave conditions with 1/120 second duration, per IEC 61000-4-5 testing methodology. This value is measured at 25°C ambient and reflects capability to absorb transient energy without parametric shift or failure. Derating applies above 25°C, governed by its 25 °C/W thermal resistance.
How does SMAJ4740E3/TR13 differ from SMAJ4740A?
SMAJ4740E3/TR13 and SMAJ4740A share identical electrical specifications-including 10.0 V ±5% Zener voltage, 2.0 W power rating, and DO-214AC package-but differ in packaging format and traceability. SMAJ4740E3/TR13 is supplied in 3,000-piece tape-and-reel (TR13) with E3 grade reliability screening, whereas SMAJ4740A typically denotes bulk or different reel configurations without E3 qualification. Both perform identically in circuit; SMAJ4740E3/TR13 is optimized for automated SMT placement and high-volume production traceability.
Can SMAJ4740E3/TR13 be used as a voltage reference in precision analog circuits?
SMAJ4740E3/TR13 can serve as a cost-effective voltage reference in non-critical analog circuits due to its 10.0 V ±5% tolerance and low dynamic impedance (7.0 Ω), but it lacks temperature-compensated curvature correction found in bandgap references. Its regulation is stable over –65°C to +150°C, yet voltage drift with temperature is uncharacterized beyond typical Zener coefficients. For precision applications requiring <0.1% stability, dedicated reference ICs remain preferable; SMAJ4740E3/TR13 suits moderate-accuracy biasing and clamping roles.
SMAJ4740E3/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):
- 10 V
- Tolerance:
- ±10%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 7.6 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
SMAJ4740E3/TR13 FAQ
1.How can I place an order for SMAJ4740E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4740E3/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 SMAJ4740E3/TR13 reliable?
The price and inventory of SMAJ4740E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4740E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4740E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4740E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4740E3/TR13?
SMAJ4740E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4740E3/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 SMAJ4740E3/TR13?
For technical support, including SMAJ4740E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4740E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4740E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4740E3/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 SMAJ4740E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4740E3/TR13?
All SMAJ4740E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4740E3/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 SMAJ4740E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4740E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4740E3/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…
