My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM15T27A-E3/57T
- Part No.:
- SM15T27A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T27A-E3/57T.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,754
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM15T27A-E3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection. It features 27 V standoff voltage (VWM = 23.1 V), 37.5 V clamping voltage at 40 A peak pulse current (10/1000 μs), and 1500 W peak pulse power rating - used to protect MOSFETs, ICs, and sensor signal lines in automotive power electronics against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T27A-E3/57T datasheet, SM15T27A-E3/57T pinout, SM15T27A-E3/57T application, or SM15T27A-E3/57T equivalent, key selection criteria include clamping performance under 10/1000 μs threat waveforms, thermal resistance (RθJA = 75 °C/W), unidirectional polarity with cathode band marking, and RoHS-compliant commercial-grade packaging per J-STD-020 MSL level 1.
Technical Context
The SM15T27A-E3/57T employs a glass-passivated silicon junction optimized for low-inductance transient suppression. Its breakdown voltage (VBR = 25.7–28.4 V at 1 mA) ensures precise triggering above system operating voltage while maintaining tight tolerance (±5%).
It operates within -65 °C to +150 °C junction temperature range and sustains 200 A non-repetitive forward surge current (10 ms half-sine), making it suitable for high-impedance source environments where peak current is naturally limited by system impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 23.1 V - maximum continuous reverse voltage before conduction begins; sets upper limit of normal operating range without leakage degradation. |
| VBR (Breakdown Voltage) | 25.7–28.4 V at 1 mA - guaranteed conduction onset window; ensures reliable turn-on margin above VWM for robust overvoltage response. |
| VC (Clamping Voltage) | 37.5 V at IPPM = 40 A (10/1000 μs) - peak voltage seen by protected circuit during worst-case surge; defines safe stress ceiling for downstream components. |
| PPPM (Peak Pulse Power) | 1500 W - energy-handling capacity under standardized 10/1000 μs waveform; qualifies device for lightning and motor-switching transient protection. |
| RθJA | 75 °C/W - thermal resistance from junction to ambient on recommended 8.0 mm × 8.0 mm copper pads; determines derating needed above 25 °C ambient. |
| IFSM | 200 A - single half-sine surge current rating (10 ms); supports short-duration fault events without metallization failure. |
| Polarity | Unidirectional - cathode marked with band; blocks reverse current until breakdown, enabling DC-biased line protection. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential side of protected line; enables conduction path during reverse transient when cathode is at higher potential. |
| Cathode (banded end) | Current exit terminal in forward bias; reverse-blocking terminal | Marked with visible band; connects to higher-potential side (e.g., VBUS or signal line); defines polarity-sensitive placement on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) in high-impedance systems without external current limiting. |
| Glass-passivated junction | Ensures stable VBR over lifetime and improved reliability in humid or thermally cycled environments versus epoxy-passivated alternatives. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on protected ICs - e.g., keeps 3.3 V or 5 V logic interfaces below destructive thresholds during transients. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements prior to placement. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets EU RoHS Directive 2011/65/EU and REACH SVHC requirements; suitable for consumer, industrial, and non-automotive applications. |
Applications
| Automotive Power Distribution | Industrial Motor Drive I/O Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply rails and CAN/LIN bus lines in body control modules against load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and ground, triggered within nanoseconds to clamp transients up to 1500 W. Use Value: Prevents latch-up or gate oxide damage in MCU power regulators and transceiver ICs during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shielding analog input channels and encoder feedback lines in PLC analog I/O modules from switching noise generated by contactors and solenoids. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted directly at connector entry point, absorbing 10/1000 μs surges before reaching precision ADC front-end. Use Value: Maintains ±0.1% measurement accuracy by limiting transient-induced offset shift and preventing comparator false triggering. |
| Consumer Appliance Control Boards | Telecom Power Supply Inputs |
|
Use Scenario: Safeguarding microcontroller reset and communication pins in smart HVAC controllers exposed to relay-coil transients on shared PCBs. IC Role / Device Role / Timing Role: Low-capacitance unidirectional suppressor placed adjacent to IC pins, activated within <1 ns to divert surge current away from ESD-sensitive inputs. Use Value: Eliminates field returns due to firmware lockup caused by transient-induced brownout or false interrupt assertion. |
Use Scenario: Front-end protection for AC/DC adapter secondary-side 48 V outputs feeding PoE injectors and base station RF amplifiers. IC Role / Device Role / Timing Role: Primary-level TVS on DC output rail, coordinated with upstream MOVs to handle combined lightning and switching surge energy. Use Value: Extends mean time between failures (MTBF) by >3× compared to unprotected designs under repeated 1.2/50 μs + 8/20 μs hybrid surge testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower PPPM (400 W), higher VWM (24 V), same SMC package but smaller thermal mass (RθJA = 85 °C/W). | Limited to lower-energy threats (e.g., IEC 61000-4-4 EFT only); unsuitable for lightning-level surges requiring 1500 W capability. | Select SMAJ24A only when board space constraints prevent SMC footprint use or when system-level analysis confirms <400 W surge exposure. |
| SMCJ24A | Same 1500 W rating and SMC package, but VWM = 20.5 V and VC = 36.0 V at 41.5 A - tighter clamping but lower standoff margin. | Better for 24 V nominal systems with strict <30 V clamping limits; less margin for 27 V nominal rails with ripple or tolerance stack-up. | Choose SMCJ24A if protecting 24 V logic with minimal headroom; retain SM15T27A-E3/57T for 27 V systems needing ≥23.1 V continuous operation. |
Compared with SMAJ24A and SMCJ24A, the SM15T27A-E3/57T provides optimal balance of 23.1 V standoff headroom and 37.5 V clamping for 27 V nominal industrial power rails - delivering verified 1500 W surge immunity without compromising long-term leakage stability or thermal derating margin.
Availability
SM15T27A-E3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive I/O protection, and telecom power supply inputs requiring stable component supply across extended production lifecycles.
Supply support for SM15T27A-E3/57T 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and transient protection devices with emphasis on reliability, power handling, and automotive qualification.
The SM15T Series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where 1500 W surge immunity and AEC-Q101 readiness are critical design requirements.
FAQ
What is the clamping voltage of SM15T27A-E3/57T at its rated peak pulse current?
The SM15T27A-E3/57T has a maximum clamping voltage (VC) of 37.5 V when subjected to a 10/1000 μs waveform at 40 A peak pulse current (IPPM). This value is measured under standardized test conditions per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T27A-E3/57T maintains this clamping performance across its specified operating temperature range.
Is SM15T27A-E3/57T RoHS-compliant and suitable for lead-free reflow?
Yes, the SM15T27A-E3/57T carries the "E3" suffix indicating full RoHS compliance per Directive 2011/65/EU and compatibility with lead-free reflow profiles. It meets J-STD-020 MSL Level 1 with a maximum peak reflow temperature of 260 °C, eliminating the need for pre-baking and supporting standard SMT assembly processes without moisture sensitivity concerns.
How does the SM15T27A-E3/57T differ from bidirectional variants like SM15T27CA?
The SM15T27A-E3/57T is unidirectional with a cathode band marking and blocks reverse current until breakdown, making it ideal for DC-biased lines such as power rails. In contrast, SM15T27CA is bidirectional - symmetric in both directions - and used for AC-coupled or differential signal lines like RS-485 or CAN. Their VBR and VC values are identical, but polarity and marking differ fundamentally.
What is the thermal resistance and how does it affect layout for SM15T27A-E3/57T?
The SM15T27A-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain safe junction temperatures under sustained power dissipation, PCB layout must provide adequate copper area and avoid thermal isolation. Derating begins above 25 °C ambient per Figure 2 in the datasheet.
Can SM15T27A-E3/57T be used in automotive applications?
The base SM15T27A-E3/57T is commercial-grade and not AEC-Q101 qualified. For automotive use, Vishay offers the SM15T27AHE3 variant (HE3 suffix), which adds AEC-Q101 qualification and extended reliability testing. The SM15T27A-E3/57T remains appropriate for non-safety-critical automotive subsystems where qualification is not mandated, but design validation is required per OEM specifications.
SM15T27A-E3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SM15T27A-E3/57T FAQ
1.How can I place an order for SM15T27A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T27A-E3/57T 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 SM15T27A-E3/57T reliable?
The price and inventory of SM15T27A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T27A-E3/57T is usually 5 days.
3.What payment methods are accepted for SM15T27A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T27A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T27A-E3/57T?
SM15T27A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T27A-E3/57T 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 SM15T27A-E3/57T?
For technical support, including SM15T27A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T27A-E3/57T requirements.
6.How does Aetrix verify that SM15T27A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T27A-E3/57T 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 SM15T27A-E3/57T meets industry standards.
7.What is the process for return or replacement of SM15T27A-E3/57T?
All SM15T27A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T27A-E3/57T, 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 SM15T27A-E3/57T part is unused and in its original packaging.
Return procedure for SM15T27A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T27A-E3/57T 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
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
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…
