My Inquiry
My Account
Vishay General Semiconductor - Diodes Division P4SMA27AHM3/I
- Part No.:
- P4SMA27AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA27AHM3/I.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,505
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMA27AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 27 V breakdown voltage (VBR = 25.7–28.4 V at 1 mA), 23.1 V standoff voltage (VWM), 37.5 V maximum clamping voltage (VC) at 10.7 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the P4SMA27AHM3/I datasheet, P4SMA27AHM3/I pinout, P4SMA27AHM3/I application, or P4SMA27AHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), polarity marking (cathode band), and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
The P4SMA27AHM3/I operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling fast response (<1 ns) to ESD and lightning-induced transients.
Rated for 150 °C maximum junction temperature and compliant with AEC-Q101 for automotive use, it delivers 400 W peak pulse power (derated to 300 W above 91 V) on standard 0.2" × 0.2" copper pads, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 25.7 V / 28.4 V at 1 mA - defines precise clamping onset threshold for overvoltage protection |
| VWM | 23.1 V - maximum continuous reverse operating voltage before leakage rises significantly |
| VC @ IPPM | 37.5 V at 10.7 A - clamped voltage during 10/1000 µs transient, limiting stress on downstream components |
| PPPM | 400 W - peak transient energy absorption capability under standardized surge waveform |
| IFSM | 40 A - surge current handling for 8.3 ms half-sine wave, supporting inductive load switching events |
| TJ max. | +150 °C - enables operation in under-hood automotive and high-temperature industrial environments |
| RθJA | 120 °C/W - thermal performance baseline for PCB pad layout design and derating calculations |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Cathode indicated by a visible band on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side in unidirectional TVS configuration; carries forward surge current up to 40 A |
| Cathode | Reverse-biased clamping terminal | Marked with band; referenced to system ground or protected line; conducts during overvoltage events to clamp voltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern electronics manufacturing and end-of-life disposal |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow processes without moisture sensitivity concerns |
| Glass passivated junction | Ensures stable VBR over time and temperature, minimizing parameter drift in long-life applications |
| Low incremental surge resistance | Reduces clamping voltage overshoot during fast transients, improving protection margin for sensitive ICs |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply rails in engine control units (ECUs) and body control modules (BCMs) against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp transients before they reach regulation circuitry. Use Value: Withstands 400 W surges and maintains VC ≤ 37.5 V, preventing damage to downstream PMICs and microcontrollers rated for ≤40 V absolute maximum. |
Use Scenario: Shielding analog and digital signal lines (e.g., CAN, LIN, or ADC inputs) in factory automation sensors exposed to EMI and relay switching noise. IC Role / Device Role / Timing Role: TVS placed across differential pair or single-ended line to shunt fast transients while preserving signal integrity below 23.1 V operating range. Use Value: Sub-1 ns response and low capacitance enable protection without distorting 1 Mbps CAN signals or degrading 12-bit ADC accuracy. |
| Consumer Power Adapter Input Stage | Telecom Equipment Surge Protection |
|
Use Scenario: Safeguarding AC-DC adapter primary-side rectifier outputs and secondary-side 5–24 V rails against surge coupling from mains or connected peripherals. IC Role / Device Role / Timing Role: Mounted directly at connector entry points to absorb energy before it propagates into SMPS controllers and optocouplers. Use Value: 400 W rating and 120 °C/W RθJA allow robust protection without heatsinking in compact adapter enclosures. |
Use Scenario: Front-end protection for Ethernet PHYs, PoE injectors, and base station control boards subjected to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Used in conjunction with GDTs or MOVs in multi-stage protection networks to handle residual fast-rising transients after coarse clamping. Use Value: Precise 27 V VBR aligns with telecom DC bias levels, ensuring no false triggering while maintaining tight clamping at 37.5 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ27A | Same VBR range (25.7–28.4 V) but SMB (DO-214AA) package - larger footprint, higher IPPM (17.3 A), same PPPM (600 W) | Higher power handling suits higher-energy transients; requires larger PCB area and different pad layout | Select SMBJ27A when surge energy exceeds 400 W or board space permits larger package |
| 1.5SMC27A | Same VBR and PPPM (400 W), but SMC (DO-214AB) package - intermediate size, RθJA = 100 °C/W | Better thermal performance than SMA; suited for higher ambient temperatures or sustained surge duty | Choose 1.5SMC27A for improved thermal margin in enclosed industrial enclosures above 70 °C ambient |
Compared with SMBJ27A and 1.5SMC27A, the P4SMA27AHM3/I offers the smallest footprint (SMA) and AEC-Q101/halogen-free compliance out-of-box, making it optimal for space-constrained automotive and consumer designs where regulatory alignment and assembly compatibility are critical.
Availability
P4SMA27AHM3/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer power adapters, and telecom interface protection requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for P4SMA27AHM3/I 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA Series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 validation, low-profile packaging, and precise clamping performance are mandatory.
FAQ
What is the breakdown voltage tolerance of the P4SMA27AHM3/I?
The P4SMA27AHM3/I has a breakdown voltage (VBR) specified from 25.7 V to 28.4 V at 1 mA test current, representing a ±5% tolerance around the nominal 27 V rating. This tight tolerance ensures consistent clamping behavior across production lots and supports reliable overvoltage protection design margins in automotive and industrial systems where precise threshold control is required. The P4SMA27AHM3/I's VBR is measured under standardized conditions per ANSI/IEEE C62.35 and validated during AEC-Q101 qualification.
Is the P4SMA27AHM3/I suitable for automotive applications?
Yes, the P4SMA27AHM3/I is AEC-Q101 qualified and specifically designated for automotive use with the "HM3" suffix indicating halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD per JESD22-A114. The P4SMA27AHM3/I is deployed in engine control units, body electronics, and ADAS sensor modules where reliability under thermal and electrical stress is mission-critical.
What does the "I" suffix mean in P4SMA27AHM3/I?
The "I" suffix in P4SMA27AHM3/I denotes the tape-and-reel packaging option: 7500 units per 13-inch diameter reel. This format supports high-volume automated SMT placement and is compatible with industry-standard pick-and-place equipment. The "HM3" portion confirms halogen-free, RoHS-compliant, and AEC-Q101-qualified construction, while "I" specifically identifies the reel size and quantity - distinct from the "H" suffix (1800 units per 7-inch reel). The P4SMA27AHM3/I is supplied in dry-packed, moisture-sensitive packaging meeting MSL Level 1.
How does the P4SMA27AHM3/I compare to bidirectional TVS diodes?
The P4SMA27AHM3/I is unidirectional and intended for DC circuits where polarity is fixed - such as 24 V power rails or single-ended signal lines - offering lower leakage and tighter VBR control than bidirectional variants. Bidirectional versions (e.g., P4SMA27CHM3/I) are used for AC or differential lines like RS-485 or CAN, where transients can occur in either polarity. The P4SMA27AHM3/I's cathode band clearly indicates polarity, and its forward surge rating (IFSM = 40 A) supports use in rectifier-adjacent locations where forward conduction may occur during fault conditions.
What is the thermal resistance of the P4SMA27AHM3/I, and how does it affect layout?
The P4SMA27AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB with no internal planes. To maintain safe junction temperature under repetitive surges, designers must allocate adequate copper area and consider airflow or enclosure temperature. The P4SMA27AHM3/I's RθJL of 30 °C/W also supports localized thermal relief via direct lead-to-plane connections. Layout deviations from the recommended pad size directly impact derating curves shown in Figure 2 of the datasheet.
P4SMA27AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 10.7A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA27AHM3/I FAQ
1.How can I place an order for P4SMA27AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA27AHM3/I 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 P4SMA27AHM3/I reliable?
The price and inventory of P4SMA27AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA27AHM3/I is usually 5 days.
3.What payment methods are accepted for P4SMA27AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA27AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA27AHM3/I?
P4SMA27AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA27AHM3/I 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 P4SMA27AHM3/I?
For technical support, including P4SMA27AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA27AHM3/I requirements.
6.How does Aetrix verify that P4SMA27AHM3/I is sourced from the original manufacturer or authorized distributors?
All P4SMA27AHM3/I 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 P4SMA27AHM3/I meets industry standards.
7.What is the process for return or replacement of P4SMA27AHM3/I?
All P4SMA27AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA27AHM3/I, 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 P4SMA27AHM3/I part is unused and in its original packaging.
Return procedure for P4SMA27AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA27AHM3/I 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
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
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 …
