PUMB2/ZLX Pre-Biased Bipolar Transistor (BJT) Equivalent & Substitute Parts

Part Overview

The PUMB2/ZLX is a pre-biased dual PNP bipolar junction transistor manufactured by NXP USA Inc., classified as an obsolete product. This component is a small-signal switching transistor with integrated base bias resistors, designed for surface mount applications in 6-TSSOP packaging. Due to its obsolete status, direct replacement with active, functionally equivalent alternatives is necessary for new designs and ongoing production support. The substitute parts listed maintain electrical and mechanical compatibility while offering active product status and continued manufacturer support.

Substiute Parts

PUMB2/ZLX

NXP USA Inc.In Stock: 975PUMB2/ZLX Datasheet

Current PartRFQ

DDA144EU-7-F

Diodes IncorporatedIn Stock: 3172DDA144EU-7-F Datasheet

MFR RecommendedRFQ

MUN5113DW1T1G

onsemiIn Stock: 4435MUN5113DW1T1G Datasheet

MFR RecommendedRFQ

NSVMUN5113DW1T3G

onsemiIn Stock: 758NSVMUN5113DW1T3G Datasheet

MFR RecommendedRFQ

PUMB2,115

NXP SemiconductorsIn Stock: 147021PUMB2,115 Datasheet

MFR RecommendedRFQ

RN2904,LF(CT

Toshiba Semiconductor and StorageIn Stock: 3894RN2904,LF(CT Datasheet

MFR RecommendedRFQ

RN2964(TE85L,F)

Toshiba Semiconductor and StorageIn Stock: 3794RN2964(TE85L,F) Datasheet

MFR RecommendedRFQ

SMUN5113DW1T1G

onsemiIn Stock: 83344SMUN5113DW1T1G Datasheet

MFR RecommendedRFQ

UMB2NTN

Rohm SemiconductorIn Stock: 5962UMB2NTN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PUMB2/ZLX is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Transistor configuration: 2 PNP - Pre-Biased (Dual)
• Maximum collector current: 100 mA
• Collector-emitter breakdown voltage: 50 V
• Base resistor (R1): 47 kOhms
• Emitter-base resistor (R2): 47 kOhms
• Surface mount packaging: 6-TSSOP, SC-88, or SOT-363 compatible
• RoHS3 compliance
• MSL rating: 1 (Unlimited)

All substitute parts listed maintain these core electrical specifications and packaging compatibility. Variations in secondary parameters such as DC current gain (hFE), saturation voltage (Vce), transition frequency, and maximum power dissipation do not preclude substitution when the critical parameters align. All substitute parts are active products with current manufacturer support.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation for Active Designs:

PUMB2,115 (NXP Semiconductors) is the direct active equivalent of the obsolete PUMB2/ZLX. This part maintains identical electrical specifications, packaging, and is manufactured by the same original equipment manufacturer. It carries AEC-Q100 automotive qualification and is available in high volume (146,920 pcs in stock). Selection of PUMB2,115 eliminates any functional or compatibility concerns and provides continuity with the original design intent.

Alternative Selections Based on Availability and Application Requirements:

1. SMUN5113DW1T1G (onsemi) — Highest inventory availability (83,300 pcs). Electrically equivalent with identical critical parameters. Suitable for applications where onsemi supply chain preference exists.

2. MUN5113DW1T1G (onsemi) — Active product with 4,400 pcs available. Meets all substitution criteria with minor variations in saturation voltage and power rating.

3. NSVMUN5113DW1T3G (onsemi) — Active product with 688 pcs available. Highest power rating (250 mW) among onsemi variants, suitable for higher dissipation applications.

4. RN2904,LF(CT (Toshiba) — 3,879 pcs in stock. Meets all critical parameters with 200 MHz transition frequency specification.

5. RN2964(TE85L,F) (Toshiba) — 3,731 pcs available. Lowest power rating (100 mW) and lowest collector cutoff current (100 nA), suitable for ultra-low-power applications.

6. DDA144EU-7-F (Diodes Incorporated) — 3,120 pcs in stock. Meets all critical parameters with 250 MHz transition frequency.

7. UMB2NTN (Rohm Semiconductor) — 5,950 pcs available. Meets all critical parameters with 250 MHz transition frequency and 150 mW power rating.

All substitute parts are ROHS3 compliant and carry MSL rating 1 (Unlimited). Selection among alternatives should be based on supply chain strategy, inventory availability, and secondary parameter requirements specific to the application circuit.

Frequently Asked Questions (FAQ)

Q: Can PUMB2,115 be used as a direct replacement for PUMB2/ZLX in existing designs?

A: Yes. PUMB2,115 is the active equivalent manufactured by NXP Semiconductors with identical electrical specifications, package type (6-TSSOP), and internal bias resistor configuration (47 kOhm base and emitter-base resistors). No circuit modifications are required.

Q: What is the primary reason for substituting PUMB2/ZLX?

A: PUMB2/ZLX is classified as obsolete. Manufacturer support, availability, and long-term supply cannot be guaranteed. Active equivalent parts ensure design continuity and production sustainability.

Q: Are all substitute parts pin-compatible with PUMB2/ZLX?

A: Yes. All substitute parts are dual PNP pre-biased transistors in 6-TSSOP, SC-88, or SOT-363 packaging with identical pin configurations and internal bias resistor values (47 kOhm R1 and R2).

Q: Do secondary parameter differences (hFE, Vce saturation, transition frequency) affect substitution validity?

A: No. Substitution validity is determined by critical parameters: transistor type, collector current rating, breakdown voltage, bias resistor values, and package compatibility. Secondary parameters such as DC current gain, saturation voltage, and transition frequency may vary within manufacturer specifications but do not preclude functional substitution in standard switching applications.

Q: Which substitute part offers the best inventory availability?

A: SMUN5113DW1T1G (onsemi) offers the highest inventory level at 83,300 pcs. PUMB2,115 (NXP) is also well-stocked at 146,920 pcs and is recommended as the primary choice due to manufacturer continuity.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance certification, meeting environmental and regulatory requirements equivalent to the original PUMB2/ZLX.

Q: What is the significance of MSL rating 1 (Unlimited)?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All substitute parts carry this rating, matching the original part's storage requirements.

Q: Can substitute parts be mixed in the same production batch?

A: Yes, provided the application circuit does not depend on secondary parameter specifications. For designs sensitive to transition frequency, saturation voltage, or power dissipation, maintain consistency with a single substitute part number throughout production.

Q: Which substitute part is recommended for automotive applications?

A: PUMB2,115 carries AEC-Q100 automotive qualification. For non-automotive applications, all listed substitutes are suitable based on electrical equivalence.

Q: What packaging options are available for substitute parts?

A: All substitute parts are available in surface mount 6-TSSOP, SC-88, or SOT-363 packaging. Specific supplier device packages vary by manufacturer (e.g., SOT-363, SC-88/SC70-6, UMT6, US6) but are mechanically and electrically compatible with standard 6-pin surface mount footprints.