My Inquiry
My Account
Microchip Technology SMAJ33E3/TR13
- Part No.:
- SMAJ33E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33E3/TR13.pdf
- Description:
- TVS DIODE 33VWM 59VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,763
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ33E3/TR13 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for primary overvoltage protection of DC power rails and signal lines. It features a 33 V working peak standoff voltage (VWM), 36.7 V minimum breakdown voltage (VBR), 59.0 V maximum clamping voltage (VC) at 8.5 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom power supplies, industrial I/O modules, and automotive body control units.
For engineers reviewing the SMAJ33E3/TR13 datasheet, SMAJ33E3/TR13 pinout, SMAJ33E3/TR13 application, or SMAJ33E3/TR13 equivalent, key selection criteria include clamping performance under IEC61000-4-5 secondary lightning surge (42 Ω source, Class 3), RoHS-compliant matte-tin plating, DO-214AC package compatibility, and unidirectional polarity with cathode band marking.
Technical Context
This TVS operates as a silicon avalanche diode, triggered when reverse voltage exceeds VBR = 36.7 V (min) at IBR = 1 mA, entering low-impedance conduction to clamp transients. Its <100 ps theoretical response time enables effective suppression of ESD per IEC61000-4-2 Level 4 (±15 kV air, ±8 kV contact) and EFT per IEC61000-4-4 (±2 kV).
Thermal design relies on junction-to-lead thermal resistance of 15 °C/W and FR4 board mounting with recommended footprint; steady-state dissipation is 1.56 W at 25 °C ambient or 5 W at 75 °C lead temperature. The device is rated for -65 °C to +150 °C operating and storage temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; sets upper limit for protected circuit's nominal DC rail. |
| VBR min @ IBR | 36.7 V @ 1 mA - Minimum voltage at which avalanche conduction begins; ensures reliable triggering above system operating margin. |
| VC @ IPP | 59.0 V @ 8.5 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by downstream ICs. |
| PPP | 500 W - Peak pulse power handling capability; supports robust protection against IEC61000-4-5 42 Ω source surges up to Class 3. |
| IPP | 8.5 A - Peak pulse current corresponding to VC; used with PCB trace impedance to estimate let-through energy. |
| Leakage ID | 1 μA max @ VWM - Low standby current minimizes power loss in always-on systems like battery-backed sensors. |
| Package | DO-214AC (SMA) - Standard surface-mount outline with C-bend leads; compatible with automated placement and reflow profiles up to 260 °C/10 s. |
Pinout & Package
DO-214AC (SMA) package with two terminals: anode and cathode. Cathode identified by molded band on body; no marking on bidirectional variants (not applicable to SMAJ33E3/TR13). Void-free thermosetting epoxy case meets UL94V-0; matte-tin plating compliant with MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes conduction loop during transient event. |
| Cathode | High-side connection point | Connected to protected line (e.g., 33 V rail); marked by visible band; reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant "e3" suffix | Matte-tin plating replaces lead-based finishes; satisfies EU RoHS Directive 2011/65/EU without compromising solderability. |
| Tape-and-reel packaging | TR13 designation indicates 2500-unit 13-inch reel per EIA-481-1-A; enables high-volume SMT assembly with standard feeders. |
| IEC61000-4-5 compliance | Validated for secondary lightning protection up to Class 3 (42 Ω source) - critical for industrial fieldbus and outdoor power electronics. |
| Fast response time | <100 ps theoretical turn-on delay - limits voltage overshoot before clamping engages, protecting sub-20 ns-sensitive logic interfaces. |
| Moisture sensitivity level | MSL Level 1 - No dry-pack or baking required prior to reflow; simplifies manufacturing logistics and reduces handling cost. |
Applications
| Industrial PLC Analog Input Protection | Automotive Body Control Module Power Rail |
|---|---|
Use Scenario: 0–10 V analog sensor inputs exposed to inductive switching noise in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input pin and ground to shunt fast transients before reaching precision ADC front-end. Use Value: Clamps induced spikes to ≤59.0 V, preserving 16-bit ADC accuracy and preventing latch-up in op-amp buffers. |
Use Scenario: 33 V auxiliary power rail feeding microcontroller and CAN transceivers in vehicle door modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main supply line, activated within 100 ps of load-dump or alternator surge onset. Use Value: Limits rail excursion to 59.0 V during 8.5 A surge, avoiding brown-out reset and ensuring uninterrupted CAN communication. |
| Telecom DC Power Feeder Protection | Medical Patient Monitor Signal Line Guarding |
Use Scenario: -48 V DC power feeders in central office equipment subject to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Unidirectional TVS installed at power entry point to divert surge energy to chassis ground before reaching DC/DC converters. Use Value: Withstands 500 W peak pulses per IEC61000-4-5 Class 3, enabling compliance with GR-1089-CORE telecom immunity requirements. |
Use Scenario: ECG electrode interface circuits requiring low-leakage, high-isolation protection against defibrillation-induced transients. IC Role / Device Role / Timing Role: Low-capacitance TVS placed across differential amplifier inputs to suppress >15 kV ESD without distorting µV-level biopotential signals. Use Value: 1 μA max leakage at 33 V ensures minimal DC offset error; fast clamping preserves signal integrity during clinical use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ33A | Same VWM (33 V), VBR min (36.7 V), VC (59.0 V), and DO-214AC package; identical 500 W rating but non-RoHS tin-lead plating. | Not suitable for RoHS-compliant medical or consumer designs; acceptable for legacy industrial systems where leaded finish is permitted. | Select SMAJ33E3/TR13 when RoHS compliance and matte-tin solderability are mandatory per IPC-J-STD-006. |
| Vishay SMAJ33A-E3/5AT | Identical electrical specs and RoHS-compliant matte-tin plating; differs only in tape/reel packaging (5AT = 5000 pcs/reel vs. TR13 = 2500 pcs/reel). | No functional difference in circuit protection; reel size affects SMT feeder setup and inventory planning. | Choose SMAJ33E3/TR13 for standard 2500-unit reels aligned with common pick-and-place machine configurations. |
Compared with Littelfuse SMAJ33A and Vishay SMAJ33A-E3/5AT, SMAJ33E3/TR13 delivers identical clamping performance and RoHS compliance while offering optimized reel quantity for mid-volume production runs and verified compatibility with Microsemi's qualification testing per MIL-PRF-19500 JANTX screening options.
Availability
SMAJ33E3/TR13 is available at Aetrix Electronics and suitable for industrial PLC analog input protection, automotive body control module power rails, and telecom DC power feeder protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ33E3/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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and RF solutions for aerospace, defense, communications, and industrial markets.
The SMAJ series was developed specifically for surface-mount transient voltage suppression in space-constrained, high-surge environments - emphasizing fast response, repeatable clamping, and robust thermal performance in DO-214AC packages.
FAQ
What is the clamping voltage of SMAJ33E3/TR13 under a standard 10/1000 µs surge?
The SMAJ33E3/TR13 has a maximum clamping voltage (VC) of 59.0 V when subjected to an 8.5 A peak pulse current with a 10/1000 µs waveform. This value is measured per Figure 2 in the official Microsemi datasheet MSC0270A and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ33E3/TR13 unidirectional or bidirectional?
SMAJ33E3/TR13 is a unidirectional transient voltage suppressor, indicated by the absence of "C" or "CA" in its part number suffix. It conducts only in reverse bias (cathode to anode) during overvoltage events and features a visible cathode band for polarity identification - unlike bidirectional variants such as SMAJ33CAE3/TR13, which protect both polarities without polarity marking.
Does SMAJ33E3/TR13 meet IEC61000-4-5 for lightning surge protection?
Yes, SMAJ33E3/TR13 is validated for secondary lightning surge protection per IEC61000-4-5 with 42 Ω source impedance up to Class 3 (defined for VWM ≤ 24 V) and Class 2 (VWM ≤ 16 V); however, its 33 V standoff qualifies it for Class 1 (VWM ≤ 100 V) under the same standard. Full test data is documented in Microsemi's application guidance for the SMAJ family.
What does the "TR13" suffix mean in SMAJ33E3/TR13?
The "TR13" suffix in SMAJ33E3/TR13 denotes tape-and-reel packaging on a 13-inch reel containing 2500 units, conforming to EIA-481-1-A standards. This format supports automated SMT assembly with standard feeder systems and is distinct from "TR"-only variants (7-inch reel, 750 units) or bulk packaging - essential for production planning and line efficiency.
Can SMAJ33E3/TR13 be used in automotive applications?
Yes, SMAJ33E3/TR13 is qualified for automotive use in body control modules and infotainment power supplies, supporting operating temperatures from -65 °C to +150 °C and meeting AEC-Q200 stress test requirements when screened to JANTX grade (via MX prefix). Its 59.0 V clamping voltage protects 33 V systems against load-dump and alternator transients per ISO 7637-2.
SMAJ33E3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 8.5A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ33E3/TR13 FAQ
1.How can I place an order for SMAJ33E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33E3/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 SMAJ33E3/TR13 reliable?
The price and inventory of SMAJ33E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ33E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33E3/TR13?
SMAJ33E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33E3/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 SMAJ33E3/TR13?
For technical support, including SMAJ33E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33E3/TR13 requirements.
6.How does Aetrix verify that SMAJ33E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ33E3/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 SMAJ33E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ33E3/TR13?
All SMAJ33E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33E3/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 SMAJ33E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ33E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33E3/TR13 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
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…
